95 files changed, 9268 insertions, 2707 deletions

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 9fdba03dc1fc..bf987b95b356 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -52,28 +52,3 @@ config PREEMPT
 
 endchoice
 
-config PREEMPT_RCU
-        bool "Preemptible RCU"
-        depends on PREEMPT
-        default n
-        help
-          This option reduces the latency of the kernel by making certain
-          RCU sections preemptible. Normally RCU code is non-preemptible, if
-          this option is selected then read-only RCU sections become
-          preemptible. This helps latency, but may expose bugs due to
-          now-naive assumptions about each RCU read-side critical section
-          remaining on a given CPU through its execution.
-
-          Say N if you are unsure.
-
-config RCU_TRACE
-        bool "Enable tracing for RCU - currently stats in debugfs"
-        depends on PREEMPT_RCU
-        select DEBUG_FS
-        default y
-        help
-          This option provides tracing in RCU which presents stats
-          in debugfs for debugging RCU implementation.
-
-          Say Y here if you want to enable RCU tracing
-          Say N if you are unsure.
diff --git a/kernel/Makefile b/kernel/Makefile
index 19fad003b19d..e1c5bf3365c0 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -9,7 +9,7 @@ obj-y     = sched.o fork.o exec_domain.o panic.o printk.o \
             rcupdate.o extable.o params.o posix-timers.o \
             kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
             hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
-            notifier.o ksysfs.o pm_qos_params.o sched_clock.o
+            notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o
 
 ifdef CONFIG_FUNCTION_TRACER
 # Do not trace debug files and internal ftrace files
@@ -19,7 +19,6 @@ CFLAGS_REMOVE_mutex-debug.o = -pg
 CFLAGS_REMOVE_rtmutex-debug.o = -pg
 CFLAGS_REMOVE_cgroup-debug.o = -pg
 CFLAGS_REMOVE_sched_clock.o = -pg
-CFLAGS_REMOVE_sched.o = -pg
 endif
 
 obj-$(CONFIG_FREEZER) += freezer.o
@@ -74,10 +73,10 @@ obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_CLASSIC_RCU) += rcuclassic.o
+obj-$(CONFIG_TREE_RCU) += rcutree.o
 obj-$(CONFIG_PREEMPT_RCU) += rcupreempt.o
-ifeq ($(CONFIG_PREEMPT_RCU),y)
-obj-$(CONFIG_RCU_TRACE) += rcupreempt_trace.o
-endif
+obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
+obj-$(CONFIG_PREEMPT_RCU_TRACE) += rcupreempt_trace.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
@@ -90,7 +89,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
 
-ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
+ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
 # needed for x86 only.  Why this used to be enabled for all architectures is beyond
 # me.  I suspect most platforms don't need this, but until we know that for sure
diff --git a/kernel/acct.c b/kernel/acct.c
index f6006a60df5d..d57b7cbb98b6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -530,15 +530,14 @@ static void do_acct_process(struct bsd_acct_struct *acct,
         do_div(elapsed, AHZ);
         ac.ac_btime = get_seconds() - elapsed;
         /* we really need to bite the bullet and change layout */
-        ac.ac_uid = current->uid;
-        ac.ac_gid = current->gid;
+        current_uid_gid(&ac.ac_uid, &ac.ac_gid);
 #if ACCT_VERSION==2
         ac.ac_ahz = AHZ;
 #endif
 #if ACCT_VERSION==1 || ACCT_VERSION==2
         /* backward-compatible 16 bit fields */
-        ac.ac_uid16 = current->uid;
-        ac.ac_gid16 = current->gid;
+        ac.ac_uid16 = ac.ac_uid;
+        ac.ac_gid16 = ac.ac_gid;
 #endif
 #if ACCT_VERSION==3
         ac.ac_pid = task_tgid_nr_ns(current, ns);
diff --git a/kernel/audit.c b/kernel/audit.c
index 4414e93d8750..ce6d8ea3131e 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -61,8 +61,11 @@
 
 #include "audit.h"
 
-/* No auditing will take place until audit_initialized != 0.
+/* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
  * (Initialization happens after skb_init is called.) */
+#define AUDIT_DISABLED          -1
+#define AUDIT_UNINITIALIZED     0
+#define AUDIT_INITIALIZED       1
 static int      audit_initialized;
 
 #define AUDIT_OFF       0
@@ -965,6 +968,9 @@ static int __init audit_init(void)
 {
         int i;
 
+        if (audit_initialized == AUDIT_DISABLED)
+                return 0;
+
         printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
                audit_default ? "enabled" : "disabled");
         audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0,
@@ -976,7 +982,7 @@ static int __init audit_init(void)
 
         skb_queue_head_init(&audit_skb_queue);
         skb_queue_head_init(&audit_skb_hold_queue);
-        audit_initialized = 1;
+        audit_initialized = AUDIT_INITIALIZED;
         audit_enabled = audit_default;
         audit_ever_enabled |= !!audit_default;
 
@@ -999,13 +1005,21 @@ __initcall(audit_init);
 static int __init audit_enable(char *str)
 {
         audit_default = !!simple_strtol(str, NULL, 0);
-        printk(KERN_INFO "audit: %s%s\n",
-               audit_default ? "enabled" : "disabled",
-               audit_initialized ? "" : " (after initialization)");
-        if (audit_initialized) {
+        if (!audit_default)
+                audit_initialized = AUDIT_DISABLED;
+
+        printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
+
+        if (audit_initialized == AUDIT_INITIALIZED) {
                 audit_enabled = audit_default;
                 audit_ever_enabled |= !!audit_default;
+        } else if (audit_initialized == AUDIT_UNINITIALIZED) {
+                printk(" (after initialization)");
+        } else {
+                printk(" (until reboot)");
         }
+        printk("\n");
+
         return 1;
 }
 
@@ -1107,9 +1121,7 @@ unsigned int audit_serial(void)
 static inline void audit_get_stamp(struct audit_context *ctx,
                                    struct timespec *t, unsigned int *serial)
 {
-        if (ctx)
-                auditsc_get_stamp(ctx, t, serial);
-        else {
+        if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
                 *t = CURRENT_TIME;
                 *serial = audit_serial();
         }
@@ -1146,7 +1158,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
         int reserve;
         unsigned long timeout_start = jiffies;
 
-        if (!audit_initialized)
+        if (audit_initialized != AUDIT_INITIALIZED)
                 return NULL;
 
         if (unlikely(audit_filter_type(type)))
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cf5bc2f5f9c3..4819f3711973 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -65,6 +65,7 @@
 #include <linux/highmem.h>
 #include <linux/syscalls.h>
 #include <linux/inotify.h>
+#include <linux/capability.h>
 
 #include "audit.h"
 
@@ -84,6 +85,15 @@ int audit_n_rules;
 /* determines whether we collect data for signals sent */
 int audit_signals;
 
+struct audit_cap_data {
+        kernel_cap_t            permitted;
+        kernel_cap_t            inheritable;
+        union {
+                unsigned int    fE;             /* effective bit of a file capability */
+                kernel_cap_t    effective;      /* effective set of a process */
+        };
+};
+
 /* When fs/namei.c:getname() is called, we store the pointer in name and
  * we don't let putname() free it (instead we free all of the saved
  * pointers at syscall exit time).
@@ -100,6 +110,8 @@ struct audit_names {
         gid_t           gid;
         dev_t           rdev;
         u32             osid;
+        struct audit_cap_data fcap;
+        unsigned int    fcap_ver;
 };
 
 struct audit_aux_data {
@@ -184,6 +196,20 @@ struct audit_aux_data_pids {
         int                     pid_count;
 };
 
+struct audit_aux_data_bprm_fcaps {
+        struct audit_aux_data   d;
+        struct audit_cap_data   fcap;
+        unsigned int            fcap_ver;
+        struct audit_cap_data   old_pcap;
+        struct audit_cap_data   new_pcap;
+};
+
+struct audit_aux_data_capset {
+        struct audit_aux_data   d;
+        pid_t                   pid;
+        struct audit_cap_data   cap;
+};
+
 struct audit_tree_refs {
         struct audit_tree_refs *next;
         struct audit_chunk *c[31];
@@ -421,6 +447,7 @@ static int audit_filter_rules(struct task_struct *tsk,
                               struct audit_names *name,
                               enum audit_state *state)
 {
+        const struct cred *cred = get_task_cred(tsk);
         int i, j, need_sid = 1;
         u32 sid;
 
@@ -440,28 +467,28 @@ static int audit_filter_rules(struct task_struct *tsk,
                         }
                         break;
                 case AUDIT_UID:
-                        result = audit_comparator(tsk->uid, f->op, f->val);
+                        result = audit_comparator(cred->uid, f->op, f->val);
                         break;
                 case AUDIT_EUID:
-                        result = audit_comparator(tsk->euid, f->op, f->val);
+                        result = audit_comparator(cred->euid, f->op, f->val);
                         break;
                 case AUDIT_SUID:
-                        result = audit_comparator(tsk->suid, f->op, f->val);
+                        result = audit_comparator(cred->suid, f->op, f->val);
                         break;
                 case AUDIT_FSUID:
-                        result = audit_comparator(tsk->fsuid, f->op, f->val);
+                        result = audit_comparator(cred->fsuid, f->op, f->val);
                         break;
                 case AUDIT_GID:
-                        result = audit_comparator(tsk->gid, f->op, f->val);
+                        result = audit_comparator(cred->gid, f->op, f->val);
                         break;
                 case AUDIT_EGID:
-                        result = audit_comparator(tsk->egid, f->op, f->val);
+                        result = audit_comparator(cred->egid, f->op, f->val);
                         break;
                 case AUDIT_SGID:
-                        result = audit_comparator(tsk->sgid, f->op, f->val);
+                        result = audit_comparator(cred->sgid, f->op, f->val);
                         break;
                 case AUDIT_FSGID:
-                        result = audit_comparator(tsk->fsgid, f->op, f->val);
+                        result = audit_comparator(cred->fsgid, f->op, f->val);
                         break;
                 case AUDIT_PERS:
                         result = audit_comparator(tsk->personality, f->op, f->val);
@@ -615,8 +642,10 @@ static int audit_filter_rules(struct task_struct *tsk,
                         break;
                 }
 
-                if (!result)
+                if (!result) {
+                        put_cred(cred);
                         return 0;
+                }
         }
         if (rule->filterkey && ctx)
                 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
@@ -624,6 +653,7 @@ static int audit_filter_rules(struct task_struct *tsk,
         case AUDIT_NEVER:    *state = AUDIT_DISABLED;       break;
         case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
         }
+        put_cred(cred);
         return 1;
 }
 
@@ -1171,8 +1201,38 @@ static void audit_log_execve_info(struct audit_context *context,
         kfree(buf);
 }
 
+static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
+{
+        int i;
+
+        audit_log_format(ab, " %s=", prefix);
+        CAP_FOR_EACH_U32(i) {
+                audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
+        }
+}
+
+static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
+{
+        kernel_cap_t *perm = &name->fcap.permitted;
+        kernel_cap_t *inh = &name->fcap.inheritable;
+        int log = 0;
+
+        if (!cap_isclear(*perm)) {
+                audit_log_cap(ab, "cap_fp", perm);
+                log = 1;
+        }
+        if (!cap_isclear(*inh)) {
+                audit_log_cap(ab, "cap_fi", inh);
+                log = 1;
+        }
+
+        if (log)
+                audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
+}
+
 static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
 {
+        const struct cred *cred;
         int i, call_panic = 0;
         struct audit_buffer *ab;
         struct audit_aux_data *aux;
@@ -1182,14 +1242,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
         context->pid = tsk->pid;
         if (!context->ppid)
                 context->ppid = sys_getppid();
-        context->uid = tsk->uid;
-        context->gid = tsk->gid;
-        context->euid = tsk->euid;
-        context->suid = tsk->suid;
-        context->fsuid = tsk->fsuid;
-        context->egid = tsk->egid;
-        context->sgid = tsk->sgid;
-        context->fsgid = tsk->fsgid;
+        cred = current_cred();
+        context->uid   = cred->uid;
+        context->gid   = cred->gid;
+        context->euid  = cred->euid;
+        context->suid  = cred->suid;
+        context->fsuid = cred->fsuid;
+        context->egid  = cred->egid;
+        context->sgid  = cred->sgid;
+        context->fsgid = cred->fsgid;
         context->personality = tsk->personality;
 
         ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
@@ -1334,6 +1395,28 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                         audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
                         break; }
 
+                case AUDIT_BPRM_FCAPS: {
+                        struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
+                        audit_log_format(ab, "fver=%x", axs->fcap_ver);
+                        audit_log_cap(ab, "fp", &axs->fcap.permitted);
+                        audit_log_cap(ab, "fi", &axs->fcap.inheritable);
+                        audit_log_format(ab, " fe=%d", axs->fcap.fE);
+                        audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
+                        audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
+                        audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
+                        audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
+                        audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
+                        audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
+                        break; }
+
+                case AUDIT_CAPSET: {
+                        struct audit_aux_data_capset *axs = (void *)aux;
+                        audit_log_format(ab, "pid=%d", axs->pid);
+                        audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
+                        audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
+                        audit_log_cap(ab, "cap_pe", &axs->cap.effective);
+                        break; }
+
                 }
                 audit_log_end(ab);
         }
@@ -1421,6 +1504,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                         }
                 }
 
+                audit_log_fcaps(ab, n);
+
                 audit_log_end(ab);
         }
 
@@ -1459,7 +1544,6 @@ void audit_free(struct task_struct *tsk)
 
 /**
  * audit_syscall_entry - fill in an audit record at syscall entry
- * @tsk: task being audited
  * @arch: architecture type
  * @major: major syscall type (function)
  * @a1: additional syscall register 1
@@ -1548,9 +1632,25 @@ void audit_syscall_entry(int arch, int major,
         context->ppid       = 0;
 }
 
+void audit_finish_fork(struct task_struct *child)
+{
+        struct audit_context *ctx = current->audit_context;
+        struct audit_context *p = child->audit_context;
+        if (!p || !ctx || !ctx->auditable)
+                return;
+        p->arch = ctx->arch;
+        p->major = ctx->major;
+        memcpy(p->argv, ctx->argv, sizeof(ctx->argv));
+        p->ctime = ctx->ctime;
+        p->dummy = ctx->dummy;
+        p->auditable = ctx->auditable;
+        p->in_syscall = ctx->in_syscall;
+        p->filterkey = kstrdup(ctx->filterkey, GFP_KERNEL);
+        p->ppid = current->pid;
+}
+
 /**
  * audit_syscall_exit - deallocate audit context after a system call
- * @tsk: task being audited
  * @valid: success/failure flag
  * @return_code: syscall return value
  *
@@ -1787,8 +1887,36 @@ static int audit_inc_name_count(struct audit_context *context,
         return 0;
 }
 
+
+static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry)
+{
+        struct cpu_vfs_cap_data caps;
+        int rc;
+
+        memset(&name->fcap.permitted, 0, sizeof(kernel_cap_t));
+        memset(&name->fcap.inheritable, 0, sizeof(kernel_cap_t));
+        name->fcap.fE = 0;
+        name->fcap_ver = 0;
+
+        if (!dentry)
+                return 0;
+
+        rc = get_vfs_caps_from_disk(dentry, &caps);
+        if (rc)
+                return rc;
+
+        name->fcap.permitted = caps.permitted;
+        name->fcap.inheritable = caps.inheritable;
+        name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+        name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+        return 0;
+}
+
+
 /* Copy inode data into an audit_names. */
-static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
+static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
+                             const struct inode *inode)
 {
         name->ino   = inode->i_ino;
         name->dev   = inode->i_sb->s_dev;
@@ -1797,6 +1925,7 @@ static void audit_copy_inode(struct audit_names *name, const struct inode *inode
         name->gid   = inode->i_gid;
         name->rdev  = inode->i_rdev;
         security_inode_getsecid(inode, &name->osid);
+        audit_copy_fcaps(name, dentry);
 }
 
 /**
@@ -1831,7 +1960,7 @@ void __audit_inode(const char *name, const struct dentry *dentry)
                 context->names[idx].name = NULL;
         }
         handle_path(dentry);
-        audit_copy_inode(&context->names[idx], inode);
+        audit_copy_inode(&context->names[idx], dentry, inode);
 }
 
 /**
@@ -1892,7 +2021,7 @@ void __audit_inode_child(const char *dname, const struct dentry *dentry,
                 if (!strcmp(dname, n->name) ||
                      !audit_compare_dname_path(dname, n->name, &dirlen)) {
                         if (inode)
-                                audit_copy_inode(n, inode);
+                                audit_copy_inode(n, NULL, inode);
                         else
                                 n->ino = (unsigned long)-1;
                         found_child = n->name;
@@ -1906,7 +2035,7 @@ add_names:
                         return;
                 idx = context->name_count - 1;
                 context->names[idx].name = NULL;
-                audit_copy_inode(&context->names[idx], parent);
+                audit_copy_inode(&context->names[idx], NULL, parent);
         }
 
         if (!found_child) {
@@ -1927,7 +2056,7 @@ add_names:
                 }
 
                 if (inode)
-                        audit_copy_inode(&context->names[idx], inode);
+                        audit_copy_inode(&context->names[idx], NULL, inode);
                 else
                         context->names[idx].ino = (unsigned long)-1;
         }
@@ -1942,15 +2071,18 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
  *
  * Also sets the context as auditable.
  */
-void auditsc_get_stamp(struct audit_context *ctx,
+int auditsc_get_stamp(struct audit_context *ctx,
                        struct timespec *t, unsigned int *serial)
 {
+        if (!ctx->in_syscall)
+                return 0;
         if (!ctx->serial)
                 ctx->serial = audit_serial();
         t->tv_sec  = ctx->ctime.tv_sec;
         t->tv_nsec = ctx->ctime.tv_nsec;
         *serial    = ctx->serial;
         ctx->auditable = 1;
+        return 1;
 }
 
 /* global counter which is incremented every time something logs in */
@@ -1978,7 +2110,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
                         audit_log_format(ab, "login pid=%d uid=%u "
                                 "old auid=%u new auid=%u"
                                 " old ses=%u new ses=%u",
-                                task->pid, task->uid,
+                                task->pid, task_uid(task),
                                 task->loginuid, loginuid,
                                 task->sessionid, sessionid);
                         audit_log_end(ab);
@@ -2361,7 +2493,7 @@ void __audit_ptrace(struct task_struct *t)
 
         context->target_pid = t->pid;
         context->target_auid = audit_get_loginuid(t);
-        context->target_uid = t->uid;
+        context->target_uid = task_uid(t);
         context->target_sessionid = audit_get_sessionid(t);
         security_task_getsecid(t, &context->target_sid);
         memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
@@ -2380,6 +2512,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
         struct audit_aux_data_pids *axp;
         struct task_struct *tsk = current;
         struct audit_context *ctx = tsk->audit_context;
+        uid_t uid = current_uid(), t_uid = task_uid(t);
 
         if (audit_pid && t->tgid == audit_pid) {
                 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
@@ -2387,7 +2520,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
                         if (tsk->loginuid != -1)
                                 audit_sig_uid = tsk->loginuid;
                         else
-                                audit_sig_uid = tsk->uid;
+                                audit_sig_uid = uid;
                         security_task_getsecid(tsk, &audit_sig_sid);
                 }
                 if (!audit_signals || audit_dummy_context())
@@ -2399,7 +2532,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
         if (!ctx->target_pid) {
                 ctx->target_pid = t->tgid;
                 ctx->target_auid = audit_get_loginuid(t);
-                ctx->target_uid = t->uid;
+                ctx->target_uid = t_uid;
                 ctx->target_sessionid = audit_get_sessionid(t);
                 security_task_getsecid(t, &ctx->target_sid);
                 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
@@ -2420,7 +2553,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
 
         axp->target_pid[axp->pid_count] = t->tgid;
         axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
-        axp->target_uid[axp->pid_count] = t->uid;
+        axp->target_uid[axp->pid_count] = t_uid;
         axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
         security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
         memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
@@ -2430,6 +2563,86 @@ int __audit_signal_info(int sig, struct task_struct *t)
 }
 
 /**
+ * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
+ * @bprm: pointer to the bprm being processed
+ * @new: the proposed new credentials
+ * @old: the old credentials
+ *
+ * Simply check if the proc already has the caps given by the file and if not
+ * store the priv escalation info for later auditing at the end of the syscall
+ *
+ * -Eric
+ */
+int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
+                           const struct cred *new, const struct cred *old)
+{
+        struct audit_aux_data_bprm_fcaps *ax;
+        struct audit_context *context = current->audit_context;
+        struct cpu_vfs_cap_data vcaps;
+        struct dentry *dentry;
+
+        ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+        if (!ax)
+                return -ENOMEM;
+
+        ax->d.type = AUDIT_BPRM_FCAPS;
+        ax->d.next = context->aux;
+        context->aux = (void *)ax;
+
+        dentry = dget(bprm->file->f_dentry);
+        get_vfs_caps_from_disk(dentry, &vcaps);
+        dput(dentry);
+
+        ax->fcap.permitted = vcaps.permitted;
+        ax->fcap.inheritable = vcaps.inheritable;
+        ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+        ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+        ax->old_pcap.permitted   = old->cap_permitted;
+        ax->old_pcap.inheritable = old->cap_inheritable;
+        ax->old_pcap.effective   = old->cap_effective;
+
+        ax->new_pcap.permitted   = new->cap_permitted;
+        ax->new_pcap.inheritable = new->cap_inheritable;
+        ax->new_pcap.effective   = new->cap_effective;
+        return 0;
+}
+
+/**
+ * __audit_log_capset - store information about the arguments to the capset syscall
+ * @pid: target pid of the capset call
+ * @new: the new credentials
+ * @old: the old (current) credentials
+ *
+ * Record the aguments userspace sent to sys_capset for later printing by the
+ * audit system if applicable
+ */
+int __audit_log_capset(pid_t pid,
+                       const struct cred *new, const struct cred *old)
+{
+        struct audit_aux_data_capset *ax;
+        struct audit_context *context = current->audit_context;
+
+        if (likely(!audit_enabled || !context || context->dummy))
+                return 0;
+
+        ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+        if (!ax)
+                return -ENOMEM;
+
+        ax->d.type = AUDIT_CAPSET;
+        ax->d.next = context->aux;
+        context->aux = (void *)ax;
+
+        ax->pid = pid;
+        ax->cap.effective   = new->cap_effective;
+        ax->cap.inheritable = new->cap_effective;
+        ax->cap.permitted   = new->cap_permitted;
+
+        return 0;
+}
+
+/**
  * audit_core_dumps - record information about processes that end abnormally
  * @signr: signal value
  *
@@ -2440,7 +2653,8 @@ void audit_core_dumps(long signr)
 {
         struct audit_buffer *ab;
         u32 sid;
-        uid_t auid = audit_get_loginuid(current);
+        uid_t auid = audit_get_loginuid(current), uid;
+        gid_t gid;
         unsigned int sessionid = audit_get_sessionid(current);
 
         if (!audit_enabled)
@@ -2450,8 +2664,9 @@ void audit_core_dumps(long signr)
                 return;
 
         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+        current_uid_gid(&uid, &gid);
         audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
-                        auid, current->uid, current->gid, sessionid);
+                         auid, uid, gid, sessionid);
         security_task_getsecid(current, &sid);
         if (sid) {
                 char *ctx = NULL;
diff --git a/kernel/capability.c b/kernel/capability.c
index 33e51e78c2d8..36b4b4daebec 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -7,6 +7,7 @@
  * 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net>
  */
 
+#include <linux/audit.h>
 #include <linux/capability.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -14,12 +15,7 @@
 #include <linux/syscalls.h>
 #include <linux/pid_namespace.h>
 #include <asm/uaccess.h>
-
-/*
- * This lock protects task->cap_* for all tasks including current.
- * Locking rule: acquire this prior to tasklist_lock.
- */
-static DEFINE_SPINLOCK(task_capability_lock);
+#include "cred-internals.h"
 
 /*
  * Leveraged for setting/resetting capabilities
@@ -33,6 +29,17 @@ EXPORT_SYMBOL(__cap_empty_set);
 EXPORT_SYMBOL(__cap_full_set);
 EXPORT_SYMBOL(__cap_init_eff_set);
 
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+int file_caps_enabled = 1;
+
+static int __init file_caps_disable(char *str)
+{
+        file_caps_enabled = 0;
+        return 1;
+}
+__setup("no_file_caps", file_caps_disable);
+#endif
+
 /*
  * More recent versions of libcap are available from:
  *
@@ -115,167 +122,12 @@ static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy)
         return 0;
 }
 
-#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
-
-/*
- * Without filesystem capability support, we nominally support one process
- * setting the capabilities of another
- */
-static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
-                                     kernel_cap_t *pIp, kernel_cap_t *pPp)
-{
-        struct task_struct *target;
-        int ret;
-
-        spin_lock(&task_capability_lock);
-        read_lock(&tasklist_lock);
-
-        if (pid && pid != task_pid_vnr(current)) {
-                target = find_task_by_vpid(pid);
-                if (!target) {
-                        ret = -ESRCH;
-                        goto out;
-                }
-        } else
-                target = current;
-
-        ret = security_capget(target, pEp, pIp, pPp);
-
-out:
-        read_unlock(&tasklist_lock);
-        spin_unlock(&task_capability_lock);
-
-        return ret;
-}
-
-/*
- * cap_set_pg - set capabilities for all processes in a given process
- * group.  We call this holding task_capability_lock and tasklist_lock.
- */
-static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
-                             kernel_cap_t *inheritable,
-                             kernel_cap_t *permitted)
-{
-        struct task_struct *g, *target;
-        int ret = -EPERM;
-        int found = 0;
-        struct pid *pgrp;
-
-        spin_lock(&task_capability_lock);
-        read_lock(&tasklist_lock);
-
-        pgrp = find_vpid(pgrp_nr);
-        do_each_pid_task(pgrp, PIDTYPE_PGID, g) {
-                target = g;
-                while_each_thread(g, target) {
-                        if (!security_capset_check(target, effective,
-                                                   inheritable, permitted)) {
-                                security_capset_set(target, effective,
-                                                    inheritable, permitted);
-                                ret = 0;
-                        }
-                        found = 1;
-                }
-        } while_each_pid_task(pgrp, PIDTYPE_PGID, g);
-
-        read_unlock(&tasklist_lock);
-        spin_unlock(&task_capability_lock);
-
-        if (!found)
-                ret = 0;
-        return ret;
-}
-
-/*
- * cap_set_all - set capabilities for all processes other than init
- * and self.  We call this holding task_capability_lock and tasklist_lock.
- */
-static inline int cap_set_all(kernel_cap_t *effective,
-                              kernel_cap_t *inheritable,
-                              kernel_cap_t *permitted)
-{
-        struct task_struct *g, *target;
-        int ret = -EPERM;
-        int found = 0;
-
-        spin_lock(&task_capability_lock);
-        read_lock(&tasklist_lock);
-
-        do_each_thread(g, target) {
-                if (target == current
-                    || is_container_init(target->group_leader))
-                        continue;
-                found = 1;
-                if (security_capset_check(target, effective, inheritable,
-                                          permitted))
-                        continue;
-                ret = 0;
-                security_capset_set(target, effective, inheritable, permitted);
-        } while_each_thread(g, target);
-
-        read_unlock(&tasklist_lock);
-        spin_unlock(&task_capability_lock);
-
-        if (!found)
-                ret = 0;
-
-        return ret;
-}
-
-/*
- * Given the target pid does not refer to the current process we
- * need more elaborate support... (This support is not present when
- * filesystem capabilities are configured.)
- */
-static inline int do_sys_capset_other_tasks(pid_t pid, kernel_cap_t *effective,
-                                            kernel_cap_t *inheritable,
-                                            kernel_cap_t *permitted)
-{
-        struct task_struct *target;
-        int ret;
-
-        if (!capable(CAP_SETPCAP))
-                return -EPERM;
-
-        if (pid == -1)            /* all procs other than current and init */
-                return cap_set_all(effective, inheritable, permitted);
-
-        else if (pid < 0)                    /* all procs in process group */
-                return cap_set_pg(-pid, effective, inheritable, permitted);
-
-        /* target != current */
-        spin_lock(&task_capability_lock);
-        read_lock(&tasklist_lock);
-
-        target = find_task_by_vpid(pid);
-        if (!target)
-                ret = -ESRCH;
-        else {
-                ret = security_capset_check(target, effective, inheritable,
-                                            permitted);
-
-                /* having verified that the proposed changes are legal,
-                   we now put them into effect. */
-                if (!ret)
-                        security_capset_set(target, effective, inheritable,
-                                            permitted);
-        }
-
-        read_unlock(&tasklist_lock);
-        spin_unlock(&task_capability_lock);
-
-        return ret;
-}
-
-#else /* ie., def CONFIG_SECURITY_FILE_CAPABILITIES */
-
 /*
- * If we have configured with filesystem capability support, then the
- * only thing that can change the capabilities of the current process
- * is the current process. As such, we can't be in this code at the
- * same time as we are in the process of setting capabilities in this
- * process. The net result is that we can limit our use of locks to
- * when we are reading the caps of another process.
+ * The only thing that can change the capabilities of the current
+ * process is the current process. As such, we can't be in this code
+ * at the same time as we are in the process of setting capabilities
+ * in this process. The net result is that we can limit our use of
+ * locks to when we are reading the caps of another process.
  */
 static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
                                      kernel_cap_t *pIp, kernel_cap_t *pPp)
@@ -285,7 +137,6 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
         if (pid && (pid != task_pid_vnr(current))) {
                 struct task_struct *target;
 
-                spin_lock(&task_capability_lock);
                 read_lock(&tasklist_lock);
 
                 target = find_task_by_vpid(pid);
@@ -295,50 +146,12 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
                         ret = security_capget(target, pEp, pIp, pPp);
 
                 read_unlock(&tasklist_lock);
-                spin_unlock(&task_capability_lock);
         } else
                 ret = security_capget(current, pEp, pIp, pPp);
 
         return ret;
 }
 
-/*
- * With filesystem capability support configured, the kernel does not
- * permit the changing of capabilities in one process by another
- * process. (CAP_SETPCAP has much less broad semantics when configured
- * this way.)
- */
-static inline int do_sys_capset_other_tasks(pid_t pid,
-                                            kernel_cap_t *effective,
-                                            kernel_cap_t *inheritable,
-                                            kernel_cap_t *permitted)
-{
-        return -EPERM;
-}
-
-#endif /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
-
-/*
- * Atomically modify the effective capabilities returning the original
- * value. No permission check is performed here - it is assumed that the
- * caller is permitted to set the desired effective capabilities.
- */
-kernel_cap_t cap_set_effective(const kernel_cap_t pE_new)
-{
-        kernel_cap_t pE_old;
-
-        spin_lock(&task_capability_lock);
-
-        pE_old = current->cap_effective;
-        current->cap_effective = pE_new;
-
-        spin_unlock(&task_capability_lock);
-
-        return pE_old;
-}
-
-EXPORT_SYMBOL(cap_set_effective);
-
 /**
  * sys_capget - get the capabilities of a given process.
  * @header: pointer to struct that contains capability version and
@@ -366,7 +179,6 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
                 return -EINVAL;
 
         ret = cap_get_target_pid(pid, &pE, &pI, &pP);
-
         if (!ret) {
                 struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
                 unsigned i;
@@ -412,16 +224,14 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
  * @data: pointer to struct that contains the effective, permitted,
  *      and inheritable capabilities
  *
- * Set capabilities for a given process, all processes, or all
- * processes in a given process group.
+ * Set capabilities for the current process only.  The ability to any other
+ * process(es) has been deprecated and removed.
  *
  * The restrictions on setting capabilities are specified as:
  *
- * [pid is for the 'target' task.  'current' is the calling task.]
- *
- * I: any raised capabilities must be a subset of the (old current) permitted
- * P: any raised capabilities must be a subset of the (old current) permitted
- * E: must be set to a subset of (new target) permitted
+ * I: any raised capabilities must be a subset of the old permitted
+ * P: any raised capabilities must be a subset of the old permitted
+ * E: must be set to a subset of new permitted
  *
  * Returns 0 on success and < 0 on error.
  */
@@ -430,6 +240,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
         struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
         unsigned i, tocopy;
         kernel_cap_t inheritable, permitted, effective;
+        struct cred *new;
         int ret;
         pid_t pid;
 
@@ -440,10 +251,13 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
         if (get_user(pid, &header->pid))
                 return -EFAULT;
 
-        if (copy_from_user(&kdata, data, tocopy
-                           * sizeof(struct __user_cap_data_struct))) {
+        /* may only affect current now */
+        if (pid != 0 && pid != task_pid_vnr(current))
+                return -EPERM;
+
+        if (copy_from_user(&kdata, data,
+                           tocopy * sizeof(struct __user_cap_data_struct)))
                 return -EFAULT;
-        }
 
         for (i = 0; i < tocopy; i++) {
                 effective.cap[i] = kdata[i].effective;
@@ -457,32 +271,23 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
                 i++;
         }
 
-        if (pid && (pid != task_pid_vnr(current)))
-                ret = do_sys_capset_other_tasks(pid, &effective, &inheritable,
-                                                &permitted);
-        else {
-                /*
-                 * This lock is required even when filesystem
-                 * capability support is configured - it protects the
-                 * sys_capget() call from returning incorrect data in
-                 * the case that the targeted process is not the
-                 * current one.
-                 */
-                spin_lock(&task_capability_lock);
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
 
-                ret = security_capset_check(current, &effective, &inheritable,
-                                            &permitted);
-                /*
-                 * Having verified that the proposed changes are
-                 * legal, we now put them into effect.
-                 */
-                if (!ret)
-                        security_capset_set(current, &effective, &inheritable,
-                                            &permitted);
-                spin_unlock(&task_capability_lock);
-        }
+        ret = security_capset(new, current_cred(),
+                              &effective, &inheritable, &permitted);
+        if (ret < 0)
+                goto error;
+
+        ret = audit_log_capset(pid, new, current_cred());
+        if (ret < 0)
+                return ret;
 
+        return commit_creds(new);
 
+error:
+        abort_creds(new);
         return ret;
 }
 
@@ -498,6 +303,11 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
  */
 int capable(int cap)
 {
+        if (unlikely(!cap_valid(cap))) {
+                printk(KERN_CRIT "capable() called with invalid cap=%u\n", cap);
+                BUG();
+        }
+
         if (has_capability(current, cap)) {
                 current->flags |= PF_SUPERPRIV;
                 return 1;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index fe00b3b983a8..48348dde6d81 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -571,8 +571,8 @@ static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
 
         if (inode) {
                 inode->i_mode = mode;
-                inode->i_uid = current->fsuid;
-                inode->i_gid = current->fsgid;
+                inode->i_uid = current_fsuid();
+                inode->i_gid = current_fsgid();
                 inode->i_blocks = 0;
                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
                 inode->i_mapping->backing_dev_info = &cgroup_backing_dev_info;
@@ -702,7 +702,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
          * any child cgroups exist. This is theoretically supportable
          * but involves complex error handling, so it's being left until
          * later */
-        if (!list_empty(&cgrp->children))
+        if (root->number_of_cgroups > 1)
                 return -EBUSY;
 
         /* Process each subsystem */
@@ -1024,7 +1024,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
                 if (ret == -EBUSY) {
                         mutex_unlock(&cgroup_mutex);
                         mutex_unlock(&inode->i_mutex);
-                        goto drop_new_super;
+                        goto free_cg_links;
                 }
 
                 /* EBUSY should be the only error here */
@@ -1073,10 +1073,11 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
 
         return simple_set_mnt(mnt, sb);
 
+ free_cg_links:
+        free_cg_links(&tmp_cg_links);
  drop_new_super:
         up_write(&sb->s_umount);
         deactivate_super(sb);
-        free_cg_links(&tmp_cg_links);
         return ret;
 }
 
@@ -1279,6 +1280,7 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
 {
         struct task_struct *tsk;
+        const struct cred *cred = current_cred(), *tcred;
         int ret;
 
         if (pid) {
@@ -1288,14 +1290,16 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
                         rcu_read_unlock();
                         return -ESRCH;
                 }
-                get_task_struct(tsk);
-                rcu_read_unlock();
 
-                if ((current->euid) && (current->euid != tsk->uid)
-                    && (current->euid != tsk->suid)) {
-                        put_task_struct(tsk);
+                tcred = __task_cred(tsk);
+                if (cred->euid &&
+                    cred->euid != tcred->uid &&
+                    cred->euid != tcred->suid) {
+                        rcu_read_unlock();
                         return -EACCES;
                 }
+                get_task_struct(tsk);
+                rcu_read_unlock();
         } else {
                 tsk = current;
                 get_task_struct(tsk);
@@ -2934,9 +2938,6 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
  again:
         root = subsys->root;
         if (root == &rootnode) {
-                printk(KERN_INFO
-                       "Not cloning cgroup for unused subsystem %s\n",
-                       subsys->name);
                 mutex_unlock(&cgroup_mutex);
                 return 0;
         }
diff --git a/kernel/cred-internals.h b/kernel/cred-internals.h
new file mode 100644
index 000000000000..2dc4fc2d0bf1
--- /dev/null
+++ b/kernel/cred-internals.h
@@ -0,0 +1,21 @@
+/* Internal credentials stuff
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+/*
+ * user.c
+ */
+static inline void sched_switch_user(struct task_struct *p)
+{
+#ifdef CONFIG_USER_SCHED
+        sched_move_task(p);
+#endif  /* CONFIG_USER_SCHED */
+}
+
diff --git a/kernel/cred.c b/kernel/cred.c
new file mode 100644
index 000000000000..ff7bc071991c
--- /dev/null
+++ b/kernel/cred.c
@@ -0,0 +1,588 @@
+/* Task credentials management - see Documentation/credentials.txt
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/cred.h>
+#include <linux/sched.h>
+#include <linux/key.h>
+#include <linux/keyctl.h>
+#include <linux/init_task.h>
+#include <linux/security.h>
+#include <linux/cn_proc.h>
+#include "cred-internals.h"
+
+static struct kmem_cache *cred_jar;
+
+/*
+ * The common credentials for the initial task's thread group
+ */
+#ifdef CONFIG_KEYS
+static struct thread_group_cred init_tgcred = {
+        .usage  = ATOMIC_INIT(2),
+        .tgid   = 0,
+        .lock   = SPIN_LOCK_UNLOCKED,
+};
+#endif
+
+/*
+ * The initial credentials for the initial task
+ */
+struct cred init_cred = {
+        .usage                  = ATOMIC_INIT(4),
+        .securebits             = SECUREBITS_DEFAULT,
+        .cap_inheritable        = CAP_INIT_INH_SET,
+        .cap_permitted          = CAP_FULL_SET,
+        .cap_effective          = CAP_INIT_EFF_SET,
+        .cap_bset               = CAP_INIT_BSET,
+        .user                   = INIT_USER,
+        .group_info             = &init_groups,
+#ifdef CONFIG_KEYS
+        .tgcred                 = &init_tgcred,
+#endif
+};
+
+/*
+ * Dispose of the shared task group credentials
+ */
+#ifdef CONFIG_KEYS
+static void release_tgcred_rcu(struct rcu_head *rcu)
+{
+        struct thread_group_cred *tgcred =
+                container_of(rcu, struct thread_group_cred, rcu);
+
+        BUG_ON(atomic_read(&tgcred->usage) != 0);
+
+        key_put(tgcred->session_keyring);
+        key_put(tgcred->process_keyring);
+        kfree(tgcred);
+}
+#endif
+
+/*
+ * Release a set of thread group credentials.
+ */
+static void release_tgcred(struct cred *cred)
+{
+#ifdef CONFIG_KEYS
+        struct thread_group_cred *tgcred = cred->tgcred;
+
+        if (atomic_dec_and_test(&tgcred->usage))
+                call_rcu(&tgcred->rcu, release_tgcred_rcu);
+#endif
+}
+
+/*
+ * The RCU callback to actually dispose of a set of credentials
+ */
+static void put_cred_rcu(struct rcu_head *rcu)
+{
+        struct cred *cred = container_of(rcu, struct cred, rcu);
+
+        if (atomic_read(&cred->usage) != 0)
+                panic("CRED: put_cred_rcu() sees %p with usage %d\n",
+                      cred, atomic_read(&cred->usage));
+
+        security_cred_free(cred);
+        key_put(cred->thread_keyring);
+        key_put(cred->request_key_auth);
+        release_tgcred(cred);
+        put_group_info(cred->group_info);
+        free_uid(cred->user);
+        kmem_cache_free(cred_jar, cred);
+}
+
+/**
+ * __put_cred - Destroy a set of credentials
+ * @cred: The record to release
+ *
+ * Destroy a set of credentials on which no references remain.
+ */
+void __put_cred(struct cred *cred)
+{
+        BUG_ON(atomic_read(&cred->usage) != 0);
+
+        call_rcu(&cred->rcu, put_cred_rcu);
+}
+EXPORT_SYMBOL(__put_cred);
+
+/**
+ * prepare_creds - Prepare a new set of credentials for modification
+ *
+ * Prepare a new set of task credentials for modification.  A task's creds
+ * shouldn't generally be modified directly, therefore this function is used to
+ * prepare a new copy, which the caller then modifies and then commits by
+ * calling commit_creds().
+ *
+ * Preparation involves making a copy of the objective creds for modification.
+ *
+ * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
+ *
+ * Call commit_creds() or abort_creds() to clean up.
+ */
+struct cred *prepare_creds(void)
+{
+        struct task_struct *task = current;
+        const struct cred *old;
+        struct cred *new;
+
+        BUG_ON(atomic_read(&task->real_cred->usage) < 1);
+
+        new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
+        if (!new)
+                return NULL;
+
+        old = task->cred;
+        memcpy(new, old, sizeof(struct cred));
+
+        atomic_set(&new->usage, 1);
+        get_group_info(new->group_info);
+        get_uid(new->user);
+
+#ifdef CONFIG_KEYS
+        key_get(new->thread_keyring);
+        key_get(new->request_key_auth);
+        atomic_inc(&new->tgcred->usage);
+#endif
+
+#ifdef CONFIG_SECURITY
+        new->security = NULL;
+#endif
+
+        if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+                goto error;
+        return new;
+
+error:
+        abort_creds(new);
+        return NULL;
+}
+EXPORT_SYMBOL(prepare_creds);
+
+/*
+ * Prepare credentials for current to perform an execve()
+ * - The caller must hold current->cred_exec_mutex
+ */
+struct cred *prepare_exec_creds(void)
+{
+        struct thread_group_cred *tgcred = NULL;
+        struct cred *new;
+
+#ifdef CONFIG_KEYS
+        tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
+        if (!tgcred)
+                return NULL;
+#endif
+
+        new = prepare_creds();
+        if (!new) {
+                kfree(tgcred);
+                return new;
+        }
+
+#ifdef CONFIG_KEYS
+        /* newly exec'd tasks don't get a thread keyring */
+        key_put(new->thread_keyring);
+        new->thread_keyring = NULL;
+
+        /* create a new per-thread-group creds for all this set of threads to
+         * share */
+        memcpy(tgcred, new->tgcred, sizeof(struct thread_group_cred));
+
+        atomic_set(&tgcred->usage, 1);
+        spin_lock_init(&tgcred->lock);
+
+        /* inherit the session keyring; new process keyring */
+        key_get(tgcred->session_keyring);
+        tgcred->process_keyring = NULL;
+
+        release_tgcred(new);
+        new->tgcred = tgcred;
+#endif
+
+        return new;
+}
+
+/*
+ * prepare new credentials for the usermode helper dispatcher
+ */
+struct cred *prepare_usermodehelper_creds(void)
+{
+#ifdef CONFIG_KEYS
+        struct thread_group_cred *tgcred = NULL;
+#endif
+        struct cred *new;
+
+#ifdef CONFIG_KEYS
+        tgcred = kzalloc(sizeof(*new->tgcred), GFP_ATOMIC);
+        if (!tgcred)
+                return NULL;
+#endif
+
+        new = kmem_cache_alloc(cred_jar, GFP_ATOMIC);
+        if (!new)
+                return NULL;
+
+        memcpy(new, &init_cred, sizeof(struct cred));
+
+        atomic_set(&new->usage, 1);
+        get_group_info(new->group_info);
+        get_uid(new->user);
+
+#ifdef CONFIG_KEYS
+        new->thread_keyring = NULL;
+        new->request_key_auth = NULL;
+        new->jit_keyring = KEY_REQKEY_DEFL_DEFAULT;
+
+        atomic_set(&tgcred->usage, 1);
+        spin_lock_init(&tgcred->lock);
+        new->tgcred = tgcred;
+#endif
+
+#ifdef CONFIG_SECURITY
+        new->security = NULL;
+#endif
+        if (security_prepare_creds(new, &init_cred, GFP_ATOMIC) < 0)
+                goto error;
+
+        BUG_ON(atomic_read(&new->usage) != 1);
+        return new;
+
+error:
+        put_cred(new);
+        return NULL;
+}
+
+/*
+ * Copy credentials for the new process created by fork()
+ *
+ * We share if we can, but under some circumstances we have to generate a new
+ * set.
+ *
+ * The new process gets the current process's subjective credentials as its
+ * objective and subjective credentials
+ */
+int copy_creds(struct task_struct *p, unsigned long clone_flags)
+{
+#ifdef CONFIG_KEYS
+        struct thread_group_cred *tgcred;
+#endif
+        struct cred *new;
+        int ret;
+
+        mutex_init(&p->cred_exec_mutex);
+
+        if (
+#ifdef CONFIG_KEYS
+                !p->cred->thread_keyring &&
+#endif
+                clone_flags & CLONE_THREAD
+            ) {
+                p->real_cred = get_cred(p->cred);
+                get_cred(p->cred);
+                atomic_inc(&p->cred->user->processes);
+                return 0;
+        }
+
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+
+        if (clone_flags & CLONE_NEWUSER) {
+                ret = create_user_ns(new);
+                if (ret < 0)
+                        goto error_put;
+        }
+
+#ifdef CONFIG_KEYS
+        /* new threads get their own thread keyrings if their parent already
+         * had one */
+        if (new->thread_keyring) {
+                key_put(new->thread_keyring);
+                new->thread_keyring = NULL;
+                if (clone_flags & CLONE_THREAD)
+                        install_thread_keyring_to_cred(new);
+        }
+
+        /* we share the process and session keyrings between all the threads in
+         * a process - this is slightly icky as we violate COW credentials a
+         * bit */
+        if (!(clone_flags & CLONE_THREAD)) {
+                tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
+                if (!tgcred) {
+                        ret = -ENOMEM;
+                        goto error_put;
+                }
+                atomic_set(&tgcred->usage, 1);
+                spin_lock_init(&tgcred->lock);
+                tgcred->process_keyring = NULL;
+                tgcred->session_keyring = key_get(new->tgcred->session_keyring);
+
+                release_tgcred(new);
+                new->tgcred = tgcred;
+        }
+#endif
+
+        atomic_inc(&new->user->processes);
+        p->cred = p->real_cred = get_cred(new);
+        return 0;
+
+error_put:
+        put_cred(new);
+        return ret;
+}
+
+/**
+ * commit_creds - Install new credentials upon the current task
+ * @new: The credentials to be assigned
+ *
+ * Install a new set of credentials to the current task, using RCU to replace
+ * the old set.  Both the objective and the subjective credentials pointers are
+ * updated.  This function may not be called if the subjective credentials are
+ * in an overridden state.
+ *
+ * This function eats the caller's reference to the new credentials.
+ *
+ * Always returns 0 thus allowing this function to be tail-called at the end
+ * of, say, sys_setgid().
+ */
+int commit_creds(struct cred *new)
+{
+        struct task_struct *task = current;
+        const struct cred *old;
+
+        BUG_ON(task->cred != task->real_cred);
+        BUG_ON(atomic_read(&task->real_cred->usage) < 2);
+        BUG_ON(atomic_read(&new->usage) < 1);
+
+        old = task->real_cred;
+        security_commit_creds(new, old);
+
+        get_cred(new); /* we will require a ref for the subj creds too */
+
+        /* dumpability changes */
+        if (old->euid != new->euid ||
+            old->egid != new->egid ||
+            old->fsuid != new->fsuid ||
+            old->fsgid != new->fsgid ||
+            !cap_issubset(new->cap_permitted, old->cap_permitted)) {
+                set_dumpable(task->mm, suid_dumpable);
+                task->pdeath_signal = 0;
+                smp_wmb();
+        }
+
+        /* alter the thread keyring */
+        if (new->fsuid != old->fsuid)
+                key_fsuid_changed(task);
+        if (new->fsgid != old->fsgid)
+                key_fsgid_changed(task);
+
+        /* do it
+         * - What if a process setreuid()'s and this brings the
+         *   new uid over his NPROC rlimit?  We can check this now
+         *   cheaply with the new uid cache, so if it matters
+         *   we should be checking for it.  -DaveM
+         */
+        if (new->user != old->user)
+                atomic_inc(&new->user->processes);
+        rcu_assign_pointer(task->real_cred, new);
+        rcu_assign_pointer(task->cred, new);
+        if (new->user != old->user)
+                atomic_dec(&old->user->processes);
+
+        sched_switch_user(task);
+
+        /* send notifications */
+        if (new->uid   != old->uid  ||
+            new->euid  != old->euid ||
+            new->suid  != old->suid ||
+            new->fsuid != old->fsuid)
+                proc_id_connector(task, PROC_EVENT_UID);
+
+        if (new->gid   != old->gid  ||
+            new->egid  != old->egid ||
+            new->sgid  != old->sgid ||
+            new->fsgid != old->fsgid)
+                proc_id_connector(task, PROC_EVENT_GID);
+
+        /* release the old obj and subj refs both */
+        put_cred(old);
+        put_cred(old);
+        return 0;
+}
+EXPORT_SYMBOL(commit_creds);
+
+/**
+ * abort_creds - Discard a set of credentials and unlock the current task
+ * @new: The credentials that were going to be applied
+ *
+ * Discard a set of credentials that were under construction and unlock the
+ * current task.
+ */
+void abort_creds(struct cred *new)
+{
+        BUG_ON(atomic_read(&new->usage) < 1);
+        put_cred(new);
+}
+EXPORT_SYMBOL(abort_creds);
+
+/**
+ * override_creds - Override the current process's subjective credentials
+ * @new: The credentials to be assigned
+ *
+ * Install a set of temporary override subjective credentials on the current
+ * process, returning the old set for later reversion.
+ */
+const struct cred *override_creds(const struct cred *new)
+{
+        const struct cred *old = current->cred;
+
+        rcu_assign_pointer(current->cred, get_cred(new));
+        return old;
+}
+EXPORT_SYMBOL(override_creds);
+
+/**
+ * revert_creds - Revert a temporary subjective credentials override
+ * @old: The credentials to be restored
+ *
+ * Revert a temporary set of override subjective credentials to an old set,
+ * discarding the override set.
+ */
+void revert_creds(const struct cred *old)
+{
+        const struct cred *override = current->cred;
+
+        rcu_assign_pointer(current->cred, old);
+        put_cred(override);
+}
+EXPORT_SYMBOL(revert_creds);
+
+/*
+ * initialise the credentials stuff
+ */
+void __init cred_init(void)
+{
+        /* allocate a slab in which we can store credentials */
+        cred_jar = kmem_cache_create("cred_jar", sizeof(struct cred),
+                                     0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+}
+
+/**
+ * prepare_kernel_cred - Prepare a set of credentials for a kernel service
+ * @daemon: A userspace daemon to be used as a reference
+ *
+ * Prepare a set of credentials for a kernel service.  This can then be used to
+ * override a task's own credentials so that work can be done on behalf of that
+ * task that requires a different subjective context.
+ *
+ * @daemon is used to provide a base for the security record, but can be NULL.
+ * If @daemon is supplied, then the security data will be derived from that;
+ * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
+ *
+ * The caller may change these controls afterwards if desired.
+ *
+ * Returns the new credentials or NULL if out of memory.
+ *
+ * Does not take, and does not return holding current->cred_replace_mutex.
+ */
+struct cred *prepare_kernel_cred(struct task_struct *daemon)
+{
+        const struct cred *old;
+        struct cred *new;
+
+        new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
+        if (!new)
+                return NULL;
+
+        if (daemon)
+                old = get_task_cred(daemon);
+        else
+                old = get_cred(&init_cred);
+
+        get_uid(new->user);
+        get_group_info(new->group_info);
+
+#ifdef CONFIG_KEYS
+        atomic_inc(&init_tgcred.usage);
+        new->tgcred = &init_tgcred;
+        new->request_key_auth = NULL;
+        new->thread_keyring = NULL;
+        new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
+#endif
+
+#ifdef CONFIG_SECURITY
+        new->security = NULL;
+#endif
+        if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+                goto error;
+
+        atomic_set(&new->usage, 1);
+        put_cred(old);
+        return new;
+
+error:
+        put_cred(new);
+        return NULL;
+}
+EXPORT_SYMBOL(prepare_kernel_cred);
+
+/**
+ * set_security_override - Set the security ID in a set of credentials
+ * @new: The credentials to alter
+ * @secid: The LSM security ID to set
+ *
+ * Set the LSM security ID in a set of credentials so that the subjective
+ * security is overridden when an alternative set of credentials is used.
+ */
+int set_security_override(struct cred *new, u32 secid)
+{
+        return security_kernel_act_as(new, secid);
+}
+EXPORT_SYMBOL(set_security_override);
+
+/**
+ * set_security_override_from_ctx - Set the security ID in a set of credentials
+ * @new: The credentials to alter
+ * @secctx: The LSM security context to generate the security ID from.
+ *
+ * Set the LSM security ID in a set of credentials so that the subjective
+ * security is overridden when an alternative set of credentials is used.  The
+ * security ID is specified in string form as a security context to be
+ * interpreted by the LSM.
+ */
+int set_security_override_from_ctx(struct cred *new, const char *secctx)
+{
+        u32 secid;
+        int ret;
+
+        ret = security_secctx_to_secid(secctx, strlen(secctx), &secid);
+        if (ret < 0)
+                return ret;
+
+        return set_security_override(new, secid);
+}
+EXPORT_SYMBOL(set_security_override_from_ctx);
+
+/**
+ * set_create_files_as - Set the LSM file create context in a set of credentials
+ * @new: The credentials to alter
+ * @inode: The inode to take the context from
+ *
+ * Change the LSM file creation context in a set of credentials to be the same
+ * as the object context of the specified inode, so that the new inodes have
+ * the same MAC context as that inode.
+ */
+int set_create_files_as(struct cred *new, struct inode *inode)
+{
+        new->fsuid = inode->i_uid;
+        new->fsgid = inode->i_gid;
+        return security_kernel_create_files_as(new, inode);
+}
+EXPORT_SYMBOL(set_create_files_as);
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index b3179dad71be..abb6e17505e2 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -127,7 +127,7 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
          */
         t1 = tsk->sched_info.pcount;
         t2 = tsk->sched_info.run_delay;
-        t3 = tsk->sched_info.cpu_time;
+        t3 = tsk->se.sum_exec_runtime;
 
         d->cpu_count += t1;
 
diff --git a/kernel/exit.c b/kernel/exit.c
index 2d8be7ebb0f7..c9e5a1c14e08 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -46,12 +46,18 @@
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/tracehook.h>
+#include <linux/init_task.h>
 #include <trace/sched.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
+#include "cred-internals.h"
+
+DEFINE_TRACE(sched_process_free);
+DEFINE_TRACE(sched_process_exit);
+DEFINE_TRACE(sched_process_wait);
 
 static void exit_mm(struct task_struct * tsk);
 
@@ -164,7 +170,10 @@ void release_task(struct task_struct * p)
         int zap_leader;
 repeat:
         tracehook_prepare_release_task(p);
-        atomic_dec(&p->user->processes);
+        /* don't need to get the RCU readlock here - the process is dead and
+         * can't be modifying its own credentials */
+        atomic_dec(&__task_cred(p)->user->processes);
+
         proc_flush_task(p);
         write_lock_irq(&tasklist_lock);
         tracehook_finish_release_task(p);
@@ -339,12 +348,12 @@ static void reparent_to_kthreadd(void)
         /* cpus_allowed? */
         /* rt_priority? */
         /* signals? */
-        security_task_reparent_to_init(current);
         memcpy(current->signal->rlim, init_task.signal->rlim,
                sizeof(current->signal->rlim));
-        atomic_inc(&(INIT_USER->__count));
+
+        atomic_inc(&init_cred.usage);
+        commit_creds(&init_cred);
         write_unlock_irq(&tasklist_lock);
-        switch_uid(INIT_USER);
 }
 
 void __set_special_pids(struct pid *pid)
@@ -1028,8 +1037,6 @@ NORET_TYPE void do_exit(long code)
                  * task into the wait for ever nirwana as well.
                  */
                 tsk->flags |= PF_EXITPIDONE;
-                if (tsk->io_context)
-                        exit_io_context();
                 set_current_state(TASK_UNINTERRUPTIBLE);
                 schedule();
         }
@@ -1078,7 +1085,6 @@ NORET_TYPE void do_exit(long code)
         check_stack_usage();
         exit_thread();
         cgroup_exit(tsk, 1);
-        exit_keys(tsk);
 
         if (group_dead && tsk->signal->leader)
                 disassociate_ctty(1);
@@ -1123,7 +1129,6 @@ NORET_TYPE void do_exit(long code)
         preempt_disable();
         /* causes final put_task_struct in finish_task_switch(). */
         tsk->state = TASK_DEAD;
-
         schedule();
         BUG();
         /* Avoid "noreturn function does return".  */
@@ -1263,12 +1268,12 @@ static int wait_task_zombie(struct task_struct *p, int options,
         unsigned long state;
         int retval, status, traced;
         pid_t pid = task_pid_vnr(p);
+        uid_t uid = __task_cred(p)->uid;
 
         if (!likely(options & WEXITED))
                 return 0;
 
         if (unlikely(options & WNOWAIT)) {
-                uid_t uid = p->uid;
                 int exit_code = p->exit_code;
                 int why, status;
 
@@ -1321,10 +1326,10 @@ static int wait_task_zombie(struct task_struct *p, int options,
                  * group, which consolidates times for all threads in the
                  * group including the group leader.
                  */
+                thread_group_cputime(p, &cputime);
                 spin_lock_irq(&p->parent->sighand->siglock);
                 psig = p->parent->signal;
                 sig = p->signal;
-                thread_group_cputime(p, &cputime);
                 psig->cutime =
                         cputime_add(psig->cutime,
                         cputime_add(cputime.utime,
@@ -1389,7 +1394,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
         if (!retval && infop)
                 retval = put_user(pid, &infop->si_pid);
         if (!retval && infop)
-                retval = put_user(p->uid, &infop->si_uid);
+                retval = put_user(uid, &infop->si_uid);
         if (!retval)
                 retval = pid;
 
@@ -1454,7 +1459,8 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
         if (!unlikely(options & WNOWAIT))
                 p->exit_code = 0;
 
-        uid = p->uid;
+        /* don't need the RCU readlock here as we're holding a spinlock */
+        uid = __task_cred(p)->uid;
 unlock_sig:
         spin_unlock_irq(&p->sighand->siglock);
         if (!exit_code)
@@ -1528,10 +1534,10 @@ static int wait_task_continued(struct task_struct *p, int options,
         }
         if (!unlikely(options & WNOWAIT))
                 p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
+        uid = __task_cred(p)->uid;
         spin_unlock_irq(&p->sighand->siglock);
 
         pid = task_pid_vnr(p);
-        uid = p->uid;
         get_task_struct(p);
         read_unlock(&tasklist_lock);
 
diff --git a/kernel/extable.c b/kernel/extable.c
index a26cb2e17023..e136ed8d82ba 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -17,6 +17,7 @@
 */
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/ftrace.h>
 #include <asm/uaccess.h>
 #include <asm/sections.h>
 
@@ -40,7 +41,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
         return e;
 }
 
-int core_kernel_text(unsigned long addr)
+__notrace_funcgraph int core_kernel_text(unsigned long addr)
 {
         if (addr >= (unsigned long)_stext &&
             addr <= (unsigned long)_etext)
@@ -53,7 +54,7 @@ int core_kernel_text(unsigned long addr)
         return 0;
 }
 
-int __kernel_text_address(unsigned long addr)
+__notrace_funcgraph int __kernel_text_address(unsigned long addr)
 {
         if (core_kernel_text(addr))
                 return 1;
@@ -66,3 +67,19 @@ int kernel_text_address(unsigned long addr)
                 return 1;
         return module_text_address(addr) != NULL;
 }
+
+/*
+ * On some architectures (PPC64, IA64) function pointers
+ * are actually only tokens to some data that then holds the
+ * real function address. As a result, to find if a function
+ * pointer is part of the kernel text, we need to do some
+ * special dereferencing first.
+ */
+int func_ptr_is_kernel_text(void *ptr)
+{
+        unsigned long addr;
+        addr = (unsigned long) dereference_function_descriptor(ptr);
+        if (core_kernel_text(addr))
+                return 1;
+        return module_text_address(addr) != NULL;
+}
diff --git a/kernel/fork.c b/kernel/fork.c
index 2a372a0e206f..43cbf30669e6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -47,6 +47,7 @@
 #include <linux/mount.h>
 #include <linux/audit.h>
 #include <linux/memcontrol.h>
+#include <linux/ftrace.h>
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/acct.h>
@@ -80,6 +81,8 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
 
+DEFINE_TRACE(sched_process_fork);
+
 int nr_processes(void)
 {
         int cpu;
@@ -137,6 +140,7 @@ void free_task(struct task_struct *tsk)
         prop_local_destroy_single(&tsk->dirties);
         free_thread_info(tsk->stack);
         rt_mutex_debug_task_free(tsk);
+        ftrace_graph_exit_task(tsk);
         free_task_struct(tsk);
 }
 EXPORT_SYMBOL(free_task);
@@ -147,9 +151,8 @@ void __put_task_struct(struct task_struct *tsk)
         WARN_ON(atomic_read(&tsk->usage));
         WARN_ON(tsk == current);
 
-        security_task_free(tsk);
-        free_uid(tsk->user);
-        put_group_info(tsk->group_info);
+        put_cred(tsk->real_cred);
+        put_cred(tsk->cred);
         delayacct_tsk_free(tsk);
 
         if (!profile_handoff_task(tsk))
@@ -315,17 +318,20 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                 file = tmp->vm_file;
                 if (file) {
                         struct inode *inode = file->f_path.dentry->d_inode;
+                        struct address_space *mapping = file->f_mapping;
+
                         get_file(file);
                         if (tmp->vm_flags & VM_DENYWRITE)
                                 atomic_dec(&inode->i_writecount);
-
-                        /* insert tmp into the share list, just after mpnt */
-                        spin_lock(&file->f_mapping->i_mmap_lock);
+                        spin_lock(&mapping->i_mmap_lock);
+                        if (tmp->vm_flags & VM_SHARED)
+                                mapping->i_mmap_writable++;
                         tmp->vm_truncate_count = mpnt->vm_truncate_count;
-                        flush_dcache_mmap_lock(file->f_mapping);
+                        flush_dcache_mmap_lock(mapping);
+                        /* insert tmp into the share list, just after mpnt */
                         vma_prio_tree_add(tmp, mpnt);
-                        flush_dcache_mmap_unlock(file->f_mapping);
-                        spin_unlock(&file->f_mapping->i_mmap_lock);
+                        flush_dcache_mmap_unlock(mapping);
+                        spin_unlock(&mapping->i_mmap_lock);
                 }
 
                 /*
@@ -409,8 +415,8 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
         set_mm_counter(mm, file_rss, 0);
         set_mm_counter(mm, anon_rss, 0);
         spin_lock_init(&mm->page_table_lock);
-        rwlock_init(&mm->ioctx_list_lock);
-        mm->ioctx_list = NULL;
+        spin_lock_init(&mm->ioctx_lock);
+        INIT_HLIST_HEAD(&mm->ioctx_list);
         mm->free_area_cache = TASK_UNMAPPED_BASE;
         mm->cached_hole_size = ~0UL;
         mm_init_owner(mm, p);
@@ -815,12 +821,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         if (!sig)
                 return -ENOMEM;
 
-        ret = copy_thread_group_keys(tsk);
-        if (ret < 0) {
-                kmem_cache_free(signal_cachep, sig);
-                return ret;
-        }
-
         atomic_set(&sig->count, 1);
         atomic_set(&sig->live, 1);
         init_waitqueue_head(&sig->wait_chldexit);
@@ -865,7 +865,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 void __cleanup_signal(struct signal_struct *sig)
 {
         thread_group_cputime_free(sig);
-        exit_thread_group_keys(sig);
         tty_kref_put(sig->tty);
         kmem_cache_free(signal_cachep, sig);
 }
@@ -981,16 +980,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
 #endif
         retval = -EAGAIN;
-        if (atomic_read(&p->user->processes) >=
+        if (atomic_read(&p->real_cred->user->processes) >=
                         p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
                 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
-                    p->user != current->nsproxy->user_ns->root_user)
+                    p->real_cred->user != INIT_USER)
                         goto bad_fork_free;
         }
 
-        atomic_inc(&p->user->__count);
-        atomic_inc(&p->user->processes);
-        get_group_info(p->group_info);
+        retval = copy_creds(p, clone_flags);
+        if (retval < 0)
+                goto bad_fork_free;
 
         /*
          * If multiple threads are within copy_process(), then this check
@@ -1045,10 +1044,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         do_posix_clock_monotonic_gettime(&p->start_time);
         p->real_start_time = p->start_time;
         monotonic_to_bootbased(&p->real_start_time);
-#ifdef CONFIG_SECURITY
-        p->security = NULL;
-#endif
-        p->cap_bset = current->cap_bset;
         p->io_context = NULL;
         p->audit_context = NULL;
         cgroup_fork(p);
@@ -1089,14 +1084,14 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
         p->blocked_on = NULL; /* not blocked yet */
 #endif
+        if (unlikely(ptrace_reparented(current)))
+                ptrace_fork(p, clone_flags);
 
         /* Perform scheduler related setup. Assign this task to a CPU. */
         sched_fork(p, clone_flags);
 
-        if ((retval = security_task_alloc(p)))
-                goto bad_fork_cleanup_policy;
         if ((retval = audit_alloc(p)))
-                goto bad_fork_cleanup_security;
+                goto bad_fork_cleanup_policy;
         /* copy all the process information */
         if ((retval = copy_semundo(clone_flags, p)))
                 goto bad_fork_cleanup_audit;
@@ -1110,10 +1105,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 goto bad_fork_cleanup_sighand;
         if ((retval = copy_mm(clone_flags, p)))
                 goto bad_fork_cleanup_signal;
-        if ((retval = copy_keys(clone_flags, p)))
-                goto bad_fork_cleanup_mm;
         if ((retval = copy_namespaces(clone_flags, p)))
-                goto bad_fork_cleanup_keys;
+                goto bad_fork_cleanup_mm;
         if ((retval = copy_io(clone_flags, p)))
                 goto bad_fork_cleanup_namespaces;
         retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
@@ -1133,6 +1126,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 }
         }
 
+        ftrace_graph_init_task(p);
+
         p->pid = pid_nr(pid);
         p->tgid = p->pid;
         if (clone_flags & CLONE_THREAD)
@@ -1141,7 +1136,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         if (current->nsproxy != p->nsproxy) {
                 retval = ns_cgroup_clone(p, pid);
                 if (retval)
-                        goto bad_fork_free_pid;
+                        goto bad_fork_free_graph;
         }
 
         p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
@@ -1234,7 +1229,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 spin_unlock(&current->sighand->siglock);
                 write_unlock_irq(&tasklist_lock);
                 retval = -ERESTARTNOINTR;
-                goto bad_fork_free_pid;
+                goto bad_fork_free_graph;
         }
 
         if (clone_flags & CLONE_THREAD) {
@@ -1271,6 +1266,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         cgroup_post_fork(p);
         return p;
 
+bad_fork_free_graph:
+        ftrace_graph_exit_task(p);
 bad_fork_free_pid:
         if (pid != &init_struct_pid)
                 free_pid(pid);
@@ -1278,8 +1275,6 @@ bad_fork_cleanup_io:
         put_io_context(p->io_context);
 bad_fork_cleanup_namespaces:
         exit_task_namespaces(p);
-bad_fork_cleanup_keys:
-        exit_keys(p);
 bad_fork_cleanup_mm:
         if (p->mm)
                 mmput(p->mm);
@@ -1295,8 +1290,6 @@ bad_fork_cleanup_semundo:
         exit_sem(p);
 bad_fork_cleanup_audit:
         audit_free(p);
-bad_fork_cleanup_security:
-        security_task_free(p);
 bad_fork_cleanup_policy:
 #ifdef CONFIG_NUMA
         mpol_put(p->mempolicy);
@@ -1309,9 +1302,9 @@ bad_fork_cleanup_cgroup:
 bad_fork_cleanup_put_domain:
         module_put(task_thread_info(p)->exec_domain->module);
 bad_fork_cleanup_count:
-        put_group_info(p->group_info);
-        atomic_dec(&p->user->processes);
-        free_uid(p->user);
+        atomic_dec(&p->cred->user->processes);
+        put_cred(p->real_cred);
+        put_cred(p->cred);
 bad_fork_free:
         free_task(p);
 fork_out:
@@ -1355,6 +1348,21 @@ long do_fork(unsigned long clone_flags,
         long nr;
 
         /*
+         * Do some preliminary argument and permissions checking before we
+         * actually start allocating stuff
+         */
+        if (clone_flags & CLONE_NEWUSER) {
+                if (clone_flags & CLONE_THREAD)
+                        return -EINVAL;
+                /* hopefully this check will go away when userns support is
+                 * complete
+                 */
+                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) ||
+                                !capable(CAP_SETGID))
+                        return -EPERM;
+        }
+
+        /*
          * We hope to recycle these flags after 2.6.26
          */
         if (unlikely(clone_flags & CLONE_STOPPED)) {
@@ -1398,6 +1406,7 @@ long do_fork(unsigned long clone_flags,
                         init_completion(&vfork);
                 }
 
+                audit_finish_fork(p);
                 tracehook_report_clone(trace, regs, clone_flags, nr, p);
 
                 /*
@@ -1601,8 +1610,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
         err = -EINVAL;
         if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
                                 CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
-                                CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWUSER|
-                                CLONE_NEWNET))
+                                CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET))
                 goto bad_unshare_out;
 
         /*
diff --git a/kernel/futex.c b/kernel/futex.c
index 8af10027514b..7c6cbabe52b3 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -92,11 +92,12 @@ struct futex_pi_state {
  * A futex_q has a woken state, just like tasks have TASK_RUNNING.
  * It is considered woken when plist_node_empty(&q->list) || q->lock_ptr == 0.
  * The order of wakup is always to make the first condition true, then
- * wake up q->waiters, then make the second condition true.
+ * wake up q->waiter, then make the second condition true.
  */
 struct futex_q {
         struct plist_node list;
-        wait_queue_head_t waiters;
+        /* There can only be a single waiter */
+        wait_queue_head_t waiter;
 
         /* Which hash list lock to use: */
         spinlock_t *lock_ptr;
@@ -123,24 +124,6 @@ struct futex_hash_bucket {
 static struct futex_hash_bucket futex_queues[1<<FUTEX_HASHBITS];
 
 /*
- * Take mm->mmap_sem, when futex is shared
- */
-static inline void futex_lock_mm(struct rw_semaphore *fshared)
-{
-        if (fshared)
-                down_read(fshared);
-}
-
-/*
- * Release mm->mmap_sem, when the futex is shared
- */
-static inline void futex_unlock_mm(struct rw_semaphore *fshared)
-{
-        if (fshared)
-                up_read(fshared);
-}
-
-/*
  * We hash on the keys returned from get_futex_key (see below).
  */
 static struct futex_hash_bucket *hash_futex(union futex_key *key)
@@ -161,6 +144,45 @@ static inline int match_futex(union futex_key *key1, union futex_key *key2)
                 && key1->both.offset == key2->both.offset);
 }
 
+/*
+ * Take a reference to the resource addressed by a key.
+ * Can be called while holding spinlocks.
+ *
+ */
+static void get_futex_key_refs(union futex_key *key)
+{
+        if (!key->both.ptr)
+                return;
+
+        switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
+        case FUT_OFF_INODE:
+                atomic_inc(&key->shared.inode->i_count);
+                break;
+        case FUT_OFF_MMSHARED:
+                atomic_inc(&key->private.mm->mm_count);
+                break;
+        }
+}
+
+/*
+ * Drop a reference to the resource addressed by a key.
+ * The hash bucket spinlock must not be held.
+ */
+static void drop_futex_key_refs(union futex_key *key)
+{
+        if (!key->both.ptr)
+                return;
+
+        switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
+        case FUT_OFF_INODE:
+                iput(key->shared.inode);
+                break;
+        case FUT_OFF_MMSHARED:
+                mmdrop(key->private.mm);
+                break;
+        }
+}
+
 /**
  * get_futex_key - Get parameters which are the keys for a futex.
  * @uaddr: virtual address of the futex
@@ -179,12 +201,10 @@ static inline int match_futex(union futex_key *key1, union futex_key *key2)
  * For other futexes, it points to &current->mm->mmap_sem and
  * caller must have taken the reader lock. but NOT any spinlocks.
  */
-static int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
-                         union futex_key *key)
+static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
 {
         unsigned long address = (unsigned long)uaddr;
         struct mm_struct *mm = current->mm;
-        struct vm_area_struct *vma;
         struct page *page;
         int err;
 
@@ -208,100 +228,50 @@ static int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
                         return -EFAULT;
                 key->private.mm = mm;
                 key->private.address = address;
+                get_futex_key_refs(key);
                 return 0;
         }
-        /*
-         * The futex is hashed differently depending on whether
-         * it's in a shared or private mapping.  So check vma first.
-         */
-        vma = find_extend_vma(mm, address);
-        if (unlikely(!vma))
-                return -EFAULT;
 
-        /*
-         * Permissions.
-         */
-        if (unlikely((vma->vm_flags & (VM_IO|VM_READ)) != VM_READ))
-                return (vma->vm_flags & VM_IO) ? -EPERM : -EACCES;
+again:
+        err = get_user_pages_fast(address, 1, 0, &page);
+        if (err < 0)
+                return err;
+
+        lock_page(page);
+        if (!page->mapping) {
+                unlock_page(page);
+                put_page(page);
+                goto again;
+        }
 
         /*
          * Private mappings are handled in a simple way.
          *
          * NOTE: When userspace waits on a MAP_SHARED mapping, even if
          * it's a read-only handle, it's expected that futexes attach to
-         * the object not the particular process.  Therefore we use
-         * VM_MAYSHARE here, not VM_SHARED which is restricted to shared
-         * mappings of _writable_ handles.
+         * the object not the particular process.
          */
-        if (likely(!(vma->vm_flags & VM_MAYSHARE))) {
-                key->both.offset |= FUT_OFF_MMSHARED; /* reference taken on mm */
+        if (PageAnon(page)) {
+                key->both.offset |= FUT_OFF_MMSHARED; /* ref taken on mm */
                 key->private.mm = mm;
                 key->private.address = address;
-                return 0;
+        } else {
+                key->both.offset |= FUT_OFF_INODE; /* inode-based key */
+                key->shared.inode = page->mapping->host;
+                key->shared.pgoff = page->index;
         }
 
-        /*
-         * Linear file mappings are also simple.
-         */
-        key->shared.inode = vma->vm_file->f_path.dentry->d_inode;
-        key->both.offset |= FUT_OFF_INODE; /* inode-based key. */
-        if (likely(!(vma->vm_flags & VM_NONLINEAR))) {
-                key->shared.pgoff = (((address - vma->vm_start) >> PAGE_SHIFT)
-                                     + vma->vm_pgoff);
-                return 0;
-        }
+        get_futex_key_refs(key);
 
-        /*
-         * We could walk the page table to read the non-linear
-         * pte, and get the page index without fetching the page
-         * from swap.  But that's a lot of code to duplicate here
-         * for a rare case, so we simply fetch the page.
-         */
-        err = get_user_pages(current, mm, address, 1, 0, 0, &page, NULL);
-        if (err >= 0) {
-                key->shared.pgoff =
-                        page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
-                put_page(page);
-                return 0;
-        }
-        return err;
-}
-
-/*
- * Take a reference to the resource addressed by a key.
- * Can be called while holding spinlocks.
- *
- */
-static void get_futex_key_refs(union futex_key *key)
-{
-        if (key->both.ptr == NULL)
-                return;
-        switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
-                case FUT_OFF_INODE:
-                        atomic_inc(&key->shared.inode->i_count);
-                        break;
-                case FUT_OFF_MMSHARED:
-                        atomic_inc(&key->private.mm->mm_count);
-                        break;
-        }
+        unlock_page(page);
+        put_page(page);
+        return 0;
 }
 
-/*
- * Drop a reference to the resource addressed by a key.
- * The hash bucket spinlock must not be held.
- */
-static void drop_futex_key_refs(union futex_key *key)
+static inline
+void put_futex_key(int fshared, union futex_key *key)
 {
-        if (!key->both.ptr)
-                return;
-        switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
-                case FUT_OFF_INODE:
-                        iput(key->shared.inode);
-                        break;
-                case FUT_OFF_MMSHARED:
-                        mmdrop(key->private.mm);
-                        break;
-        }
+        drop_futex_key_refs(key);
 }
 
 static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval)
@@ -328,10 +298,8 @@ static int get_futex_value_locked(u32 *dest, u32 __user *from)
 
 /*
  * Fault handling.
- * if fshared is non NULL, current->mm->mmap_sem is already held
  */
-static int futex_handle_fault(unsigned long address,
-                              struct rw_semaphore *fshared, int attempt)
+static int futex_handle_fault(unsigned long address, int attempt)
 {
         struct vm_area_struct * vma;
         struct mm_struct *mm = current->mm;
@@ -340,8 +308,7 @@ static int futex_handle_fault(unsigned long address,
         if (attempt > 2)
                 return ret;
 
-        if (!fshared)
-                down_read(&mm->mmap_sem);
+        down_read(&mm->mmap_sem);
         vma = find_vma(mm, address);
         if (vma && address >= vma->vm_start &&
             (vma->vm_flags & VM_WRITE)) {
@@ -361,8 +328,7 @@ static int futex_handle_fault(unsigned long address,
                                 current->min_flt++;
                 }
         }
-        if (!fshared)
-                up_read(&mm->mmap_sem);
+        up_read(&mm->mmap_sem);
         return ret;
 }
 
@@ -385,6 +351,7 @@ static int refill_pi_state_cache(void)
         /* pi_mutex gets initialized later */
         pi_state->owner = NULL;
         atomic_set(&pi_state->refcount, 1);
+        pi_state->key = FUTEX_KEY_INIT;
 
         current->pi_state_cache = pi_state;
 
@@ -439,13 +406,20 @@ static void free_pi_state(struct futex_pi_state *pi_state)
 static struct task_struct * futex_find_get_task(pid_t pid)
 {
         struct task_struct *p;
+        const struct cred *cred = current_cred(), *pcred;
 
         rcu_read_lock();
         p = find_task_by_vpid(pid);
-        if (!p || ((current->euid != p->euid) && (current->euid != p->uid)))
+        if (!p) {
                 p = ERR_PTR(-ESRCH);
-        else
-                get_task_struct(p);
+        } else {
+                pcred = __task_cred(p);
+                if (cred->euid != pcred->euid &&
+                    cred->euid != pcred->uid)
+                        p = ERR_PTR(-ESRCH);
+                else
+                        get_task_struct(p);
+        }
 
         rcu_read_unlock();
 
@@ -462,7 +436,7 @@ void exit_pi_state_list(struct task_struct *curr)
         struct list_head *next, *head = &curr->pi_state_list;
         struct futex_pi_state *pi_state;
         struct futex_hash_bucket *hb;
-        union futex_key key;
+        union futex_key key = FUTEX_KEY_INIT;
 
         if (!futex_cmpxchg_enabled)
                 return;
@@ -607,7 +581,7 @@ static void wake_futex(struct futex_q *q)
          * The lock in wake_up_all() is a crucial memory barrier after the
          * plist_del() and also before assigning to q->lock_ptr.
          */
-        wake_up_all(&q->waiters);
+        wake_up(&q->waiter);
         /*
          * The waiting task can free the futex_q as soon as this is written,
          * without taking any locks.  This must come last.
@@ -719,20 +693,17 @@ double_lock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
  * Wake up all waiters hashed on the physical page that is mapped
  * to this virtual address:
  */
-static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
-                      int nr_wake, u32 bitset)
+static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
 {
         struct futex_hash_bucket *hb;
         struct futex_q *this, *next;
         struct plist_head *head;
-        union futex_key key;
+        union futex_key key = FUTEX_KEY_INIT;
         int ret;
 
         if (!bitset)
                 return -EINVAL;
 
-        futex_lock_mm(fshared);
-
         ret = get_futex_key(uaddr, fshared, &key);
         if (unlikely(ret != 0))
                 goto out;
@@ -760,7 +731,7 @@ static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
 
         spin_unlock(&hb->lock);
 out:
-        futex_unlock_mm(fshared);
+        put_futex_key(fshared, &key);
         return ret;
 }
 
@@ -769,19 +740,16 @@ out:
  * to this virtual address:
  */
 static int
-futex_wake_op(u32 __user *uaddr1, struct rw_semaphore *fshared,
-              u32 __user *uaddr2,
+futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
               int nr_wake, int nr_wake2, int op)
 {
-        union futex_key key1, key2;
+        union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
         struct futex_hash_bucket *hb1, *hb2;
         struct plist_head *head;
         struct futex_q *this, *next;
         int ret, op_ret, attempt = 0;
 
 retryfull:
-        futex_lock_mm(fshared);
-
         ret = get_futex_key(uaddr1, fshared, &key1);
         if (unlikely(ret != 0))
                 goto out;
@@ -826,18 +794,12 @@ retry:
                  */
                 if (attempt++) {
                         ret = futex_handle_fault((unsigned long)uaddr2,
-                                                 fshared, attempt);
+                                                 attempt);
                         if (ret)
                                 goto out;
                         goto retry;
                 }
 
-                /*
-                 * If we would have faulted, release mmap_sem,
-                 * fault it in and start all over again.
-                 */
-                futex_unlock_mm(fshared);
-
                 ret = get_user(dummy, uaddr2);
                 if (ret)
                         return ret;
@@ -873,7 +835,8 @@ retry:
         if (hb1 != hb2)
                 spin_unlock(&hb2->lock);
 out:
-        futex_unlock_mm(fshared);
+        put_futex_key(fshared, &key2);
+        put_futex_key(fshared, &key1);
 
         return ret;
 }
@@ -882,19 +845,16 @@ out:
  * Requeue all waiters hashed on one physical page to another
  * physical page.
  */
-static int futex_requeue(u32 __user *uaddr1, struct rw_semaphore *fshared,
-                         u32 __user *uaddr2,
+static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
                          int nr_wake, int nr_requeue, u32 *cmpval)
 {
-        union futex_key key1, key2;
+        union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
         struct futex_hash_bucket *hb1, *hb2;
         struct plist_head *head1;
         struct futex_q *this, *next;
         int ret, drop_count = 0;
 
  retry:
-        futex_lock_mm(fshared);
-
         ret = get_futex_key(uaddr1, fshared, &key1);
         if (unlikely(ret != 0))
                 goto out;
@@ -917,12 +877,6 @@ static int futex_requeue(u32 __user *uaddr1, struct rw_semaphore *fshared,
                         if (hb1 != hb2)
                                 spin_unlock(&hb2->lock);
 
-                        /*
-                         * If we would have faulted, release mmap_sem, fault
-                         * it in and start all over again.
-                         */
-                        futex_unlock_mm(fshared);
-
                         ret = get_user(curval, uaddr1);
 
                         if (!ret)
@@ -974,7 +928,8 @@ out_unlock:
                 drop_futex_key_refs(&key1);
 
 out:
-        futex_unlock_mm(fshared);
+        put_futex_key(fshared, &key2);
+        put_futex_key(fshared, &key1);
         return ret;
 }
 
@@ -983,7 +938,7 @@ static inline struct futex_hash_bucket *queue_lock(struct futex_q *q)
 {
         struct futex_hash_bucket *hb;
 
-        init_waitqueue_head(&q->waiters);
+        init_waitqueue_head(&q->waiter);
 
         get_futex_key_refs(&q->key);
         hb = hash_futex(&q->key);
@@ -1096,8 +1051,7 @@ static void unqueue_me_pi(struct futex_q *q)
  * private futexes.
  */
 static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
-                                struct task_struct *newowner,
-                                struct rw_semaphore *fshared)
+                                struct task_struct *newowner, int fshared)
 {
         u32 newtid = task_pid_vnr(newowner) | FUTEX_WAITERS;
         struct futex_pi_state *pi_state = q->pi_state;
@@ -1176,7 +1130,7 @@ retry:
 handle_fault:
         spin_unlock(q->lock_ptr);
 
-        ret = futex_handle_fault((unsigned long)uaddr, fshared, attempt++);
+        ret = futex_handle_fault((unsigned long)uaddr, attempt++);
 
         spin_lock(q->lock_ptr);
 
@@ -1196,12 +1150,13 @@ handle_fault:
  * In case we must use restart_block to restart a futex_wait,
  * we encode in the 'flags' shared capability
  */
-#define FLAGS_SHARED  1
+#define FLAGS_SHARED            0x01
+#define FLAGS_CLOCKRT           0x02
 
 static long futex_wait_restart(struct restart_block *restart);
 
-static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
-                      u32 val, ktime_t *abs_time, u32 bitset)
+static int futex_wait(u32 __user *uaddr, int fshared,
+                      u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
 {
         struct task_struct *curr = current;
         DECLARE_WAITQUEUE(wait, curr);
@@ -1218,8 +1173,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
         q.pi_state = NULL;
         q.bitset = bitset;
  retry:
-        futex_lock_mm(fshared);
-
+        q.key = FUTEX_KEY_INIT;
         ret = get_futex_key(uaddr, fshared, &q.key);
         if (unlikely(ret != 0))
                 goto out_release_sem;
@@ -1251,12 +1205,6 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
         if (unlikely(ret)) {
                 queue_unlock(&q, hb);
 
-                /*
-                 * If we would have faulted, release mmap_sem, fault it in and
-                 * start all over again.
-                 */
-                futex_unlock_mm(fshared);
-
                 ret = get_user(uval, uaddr);
 
                 if (!ret)
@@ -1271,12 +1219,6 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
         queue_me(&q, hb);
 
         /*
-         * Now the futex is queued and we have checked the data, we
-         * don't want to hold mmap_sem while we sleep.
-         */
-        futex_unlock_mm(fshared);
-
-        /*
          * There might have been scheduling since the queue_me(), as we
          * cannot hold a spinlock across the get_user() in case it
          * faults, and we cannot just set TASK_INTERRUPTIBLE state when
@@ -1287,7 +1229,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 
         /* add_wait_queue is the barrier after __set_current_state. */
         __set_current_state(TASK_INTERRUPTIBLE);
-        add_wait_queue(&q.waiters, &wait);
+        add_wait_queue(&q.waiter, &wait);
         /*
          * !plist_node_empty() is safe here without any lock.
          * q.lock_ptr != 0 is not safe, because of ordering against wakeup.
@@ -1300,8 +1242,10 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
                         slack = current->timer_slack_ns;
                         if (rt_task(current))
                                 slack = 0;
-                        hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC,
-                                                HRTIMER_MODE_ABS);
+                        hrtimer_init_on_stack(&t.timer,
+                                              clockrt ? CLOCK_REALTIME :
+                                              CLOCK_MONOTONIC,
+                                              HRTIMER_MODE_ABS);
                         hrtimer_init_sleeper(&t, current);
                         hrtimer_set_expires_range_ns(&t.timer, *abs_time, slack);
 
@@ -1356,6 +1300,8 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 
                 if (fshared)
                         restart->futex.flags |= FLAGS_SHARED;
+                if (clockrt)
+                        restart->futex.flags |= FLAGS_CLOCKRT;
                 return -ERESTART_RESTARTBLOCK;
         }
 
@@ -1363,7 +1309,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
         queue_unlock(&q, hb);
 
  out_release_sem:
-        futex_unlock_mm(fshared);
+        put_futex_key(fshared, &q.key);
         return ret;
 }
 
@@ -1371,15 +1317,16 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 static long futex_wait_restart(struct restart_block *restart)
 {
         u32 __user *uaddr = (u32 __user *)restart->futex.uaddr;
-        struct rw_semaphore *fshared = NULL;
+        int fshared = 0;
         ktime_t t;
 
         t.tv64 = restart->futex.time;
         restart->fn = do_no_restart_syscall;
         if (restart->futex.flags & FLAGS_SHARED)
-                fshared = &current->mm->mmap_sem;
+                fshared = 1;
         return (long)futex_wait(uaddr, fshared, restart->futex.val, &t,
-                                restart->futex.bitset);
+                                restart->futex.bitset,
+                                restart->futex.flags & FLAGS_CLOCKRT);
 }
 
 
@@ -1389,7 +1336,7 @@ static long futex_wait_restart(struct restart_block *restart)
  * if there are waiters then it will block, it does PI, etc. (Due to
  * races the kernel might see a 0 value of the futex too.)
  */
-static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
+static int futex_lock_pi(u32 __user *uaddr, int fshared,
                          int detect, ktime_t *time, int trylock)
 {
         struct hrtimer_sleeper timeout, *to = NULL;
@@ -1412,8 +1359,7 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 
         q.pi_state = NULL;
  retry:
-        futex_lock_mm(fshared);
-
+        q.key = FUTEX_KEY_INIT;
         ret = get_futex_key(uaddr, fshared, &q.key);
         if (unlikely(ret != 0))
                 goto out_release_sem;
@@ -1502,7 +1448,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
                          * exit to complete.
                          */
                         queue_unlock(&q, hb);
-                        futex_unlock_mm(fshared);
                         cond_resched();
                         goto retry;
 
@@ -1534,12 +1479,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
          */
         queue_me(&q, hb);
 
-        /*
-         * Now the futex is queued and we have checked the data, we
-         * don't want to hold mmap_sem while we sleep.
-         */
-        futex_unlock_mm(fshared);
-
         WARN_ON(!q.pi_state);
         /*
          * Block on the PI mutex:
@@ -1552,7 +1491,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
                 ret = ret ? 0 : -EWOULDBLOCK;
         }
 
-        futex_lock_mm(fshared);
         spin_lock(q.lock_ptr);
 
         if (!ret) {
@@ -1618,7 +1556,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 
         /* Unqueue and drop the lock */
         unqueue_me_pi(&q);
-        futex_unlock_mm(fshared);
 
         if (to)
                 destroy_hrtimer_on_stack(&to->timer);
@@ -1628,34 +1565,30 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
         queue_unlock(&q, hb);
 
  out_release_sem:
-        futex_unlock_mm(fshared);
+        put_futex_key(fshared, &q.key);
         if (to)
                 destroy_hrtimer_on_stack(&to->timer);
         return ret;
 
  uaddr_faulted:
         /*
-         * We have to r/w  *(int __user *)uaddr, but we can't modify it
-         * non-atomically.  Therefore, if get_user below is not
-         * enough, we need to handle the fault ourselves, while
-         * still holding the mmap_sem.
-         *
-         * ... and hb->lock. :-) --ANK
+         * We have to r/w  *(int __user *)uaddr, and we have to modify it
+         * atomically.  Therefore, if we continue to fault after get_user()
+         * below, we need to handle the fault ourselves, while still holding
+         * the mmap_sem.  This can occur if the uaddr is under contention as
+         * we have to drop the mmap_sem in order to call get_user().
          */
         queue_unlock(&q, hb);
 
         if (attempt++) {
-                ret = futex_handle_fault((unsigned long)uaddr, fshared,
-                                         attempt);
+                ret = futex_handle_fault((unsigned long)uaddr, attempt);
                 if (ret)
                         goto out_release_sem;
                 goto retry_unlocked;
         }
 
-        futex_unlock_mm(fshared);
-
         ret = get_user(uval, uaddr);
-        if (!ret && (uval != -EFAULT))
+        if (!ret)
                 goto retry;
 
         if (to)
@@ -1668,13 +1601,13 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
  * This is the in-kernel slowpath: we look up the PI state (if any),
  * and do the rt-mutex unlock.
  */
-static int futex_unlock_pi(u32 __user *uaddr, struct rw_semaphore *fshared)
+static int futex_unlock_pi(u32 __user *uaddr, int fshared)
 {
         struct futex_hash_bucket *hb;
         struct futex_q *this, *next;
         u32 uval;
         struct plist_head *head;
-        union futex_key key;
+        union futex_key key = FUTEX_KEY_INIT;
         int ret, attempt = 0;
 
 retry:
@@ -1685,10 +1618,6 @@ retry:
          */
         if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
                 return -EPERM;
-        /*
-         * First take all the futex related locks:
-         */
-        futex_lock_mm(fshared);
 
         ret = get_futex_key(uaddr, fshared, &key);
         if (unlikely(ret != 0))
@@ -1747,34 +1676,30 @@ retry_unlocked:
 out_unlock:
         spin_unlock(&hb->lock);
 out:
-        futex_unlock_mm(fshared);
+        put_futex_key(fshared, &key);
 
         return ret;
 
 pi_faulted:
         /*
-         * We have to r/w  *(int __user *)uaddr, but we can't modify it
-         * non-atomically.  Therefore, if get_user below is not
-         * enough, we need to handle the fault ourselves, while
-         * still holding the mmap_sem.
-         *
-         * ... and hb->lock. --ANK
+         * We have to r/w  *(int __user *)uaddr, and we have to modify it
+         * atomically.  Therefore, if we continue to fault after get_user()
+         * below, we need to handle the fault ourselves, while still holding
+         * the mmap_sem.  This can occur if the uaddr is under contention as
+         * we have to drop the mmap_sem in order to call get_user().
          */
         spin_unlock(&hb->lock);
 
         if (attempt++) {
-                ret = futex_handle_fault((unsigned long)uaddr, fshared,
-                                         attempt);
+                ret = futex_handle_fault((unsigned long)uaddr, attempt);
                 if (ret)
                         goto out;
                 uval = 0;
                 goto retry_unlocked;
         }
 
-        futex_unlock_mm(fshared);
-
         ret = get_user(uval, uaddr);
-        if (!ret && (uval != -EFAULT))
+        if (!ret)
                 goto retry;
 
         return ret;
@@ -1829,6 +1754,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
 {
         struct robust_list_head __user *head;
         unsigned long ret;
+        const struct cred *cred = current_cred(), *pcred;
 
         if (!futex_cmpxchg_enabled)
                 return -ENOSYS;
@@ -1844,8 +1770,10 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
                 if (!p)
                         goto err_unlock;
                 ret = -EPERM;
-                if ((current->euid != p->euid) && (current->euid != p->uid) &&
-                                !capable(CAP_SYS_PTRACE))
+                pcred = __task_cred(p);
+                if (cred->euid != pcred->euid &&
+                    cred->euid != pcred->uid &&
+                    !capable(CAP_SYS_PTRACE))
                         goto err_unlock;
                 head = p->robust_list;
                 rcu_read_unlock();
@@ -1898,8 +1826,7 @@ retry:
                  * PI futexes happens in exit_pi_state():
                  */
                 if (!pi && (uval & FUTEX_WAITERS))
-                        futex_wake(uaddr, &curr->mm->mmap_sem, 1,
-                                   FUTEX_BITSET_MATCH_ANY);
+                        futex_wake(uaddr, 1, 1, FUTEX_BITSET_MATCH_ANY);
         }
         return 0;
 }
@@ -1993,18 +1920,22 @@ void exit_robust_list(struct task_struct *curr)
 long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
                 u32 __user *uaddr2, u32 val2, u32 val3)
 {
-        int ret = -ENOSYS;
+        int clockrt, ret = -ENOSYS;
         int cmd = op & FUTEX_CMD_MASK;
-        struct rw_semaphore *fshared = NULL;
+        int fshared = 0;
 
         if (!(op & FUTEX_PRIVATE_FLAG))
-                fshared = &current->mm->mmap_sem;
+                fshared = 1;
+
+        clockrt = op & FUTEX_CLOCK_REALTIME;
+        if (clockrt && cmd != FUTEX_WAIT_BITSET)
+                return -ENOSYS;
 
         switch (cmd) {
         case FUTEX_WAIT:
                 val3 = FUTEX_BITSET_MATCH_ANY;
         case FUTEX_WAIT_BITSET:
-                ret = futex_wait(uaddr, fshared, val, timeout, val3);
+                ret = futex_wait(uaddr, fshared, val, timeout, val3, clockrt);
                 break;
         case FUTEX_WAKE:
                 val3 = FUTEX_BITSET_MATCH_ANY;
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 04ac3a9e42cf..d607a5b9ee29 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -135,6 +135,7 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 {
         struct compat_robust_list_head __user *head;
         unsigned long ret;
+        const struct cred *cred = current_cred(), *pcred;
 
         if (!futex_cmpxchg_enabled)
                 return -ENOSYS;
@@ -150,8 +151,10 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
                 if (!p)
                         goto err_unlock;
                 ret = -EPERM;
-                if ((current->euid != p->euid) && (current->euid != p->uid) &&
-                                !capable(CAP_SYS_PTRACE))
+                pcred = __task_cred(p);
+                if (cred->euid != pcred->euid &&
+                    cred->euid != pcred->uid &&
+                    !capable(CAP_SYS_PTRACE))
                         goto err_unlock;
                 head = p->compat_robust_list;
                 read_unlock(&tasklist_lock);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 47e63349d1b2..bda9cb924276 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -442,22 +442,6 @@ static inline void debug_hrtimer_activate(struct hrtimer *timer) { }
 static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { }
 #endif
 
-/*
- * Check, whether the timer is on the callback pending list
- */
-static inline int hrtimer_cb_pending(const struct hrtimer *timer)
-{
-        return timer->state & HRTIMER_STATE_PENDING;
-}
-
-/*
- * Remove a timer from the callback pending list
- */
-static inline void hrtimer_remove_cb_pending(struct hrtimer *timer)
-{
-        list_del_init(&timer->cb_entry);
-}
-
 /* High resolution timer related functions */
 #ifdef CONFIG_HIGH_RES_TIMERS
 
@@ -651,6 +635,8 @@ static inline void hrtimer_init_timer_hres(struct hrtimer *timer)
 {
 }
 
+static void __run_hrtimer(struct hrtimer *timer);
+
 /*
  * When High resolution timers are active, try to reprogram. Note, that in case
  * the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry
@@ -661,31 +647,14 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
                                             struct hrtimer_clock_base *base)
 {
         if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) {
-
-                /* Timer is expired, act upon the callback mode */
-                switch(timer->cb_mode) {
-                case HRTIMER_CB_IRQSAFE_PERCPU:
-                case HRTIMER_CB_IRQSAFE_UNLOCKED:
-                        /*
-                         * This is solely for the sched tick emulation with
-                         * dynamic tick support to ensure that we do not
-                         * restart the tick right on the edge and end up with
-                         * the tick timer in the softirq ! The calling site
-                         * takes care of this. Also used for hrtimer sleeper !
-                         */
-                        debug_hrtimer_deactivate(timer);
-                        return 1;
-                case HRTIMER_CB_SOFTIRQ:
-                        /*
-                         * Move everything else into the softirq pending list !
-                         */
-                        list_add_tail(&timer->cb_entry,
-                                      &base->cpu_base->cb_pending);
-                        timer->state = HRTIMER_STATE_PENDING;
-                        return 1;
-                default:
-                        BUG();
-                }
+                /*
+                 * XXX: recursion check?
+                 * hrtimer_forward() should round up with timer granularity
+                 * so that we never get into inf recursion here,
+                 * it doesn't do that though
+                 */
+                __run_hrtimer(timer);
+                return 1;
         }
         return 0;
 }
@@ -724,11 +693,6 @@ static int hrtimer_switch_to_hres(void)
         return 1;
 }
 
-static inline void hrtimer_raise_softirq(void)
-{
-        raise_softirq(HRTIMER_SOFTIRQ);
-}
-
 #else
 
 static inline int hrtimer_hres_active(void) { return 0; }
@@ -747,7 +711,6 @@ static inline int hrtimer_reprogram(struct hrtimer *timer,
 {
         return 0;
 }
-static inline void hrtimer_raise_softirq(void) { }
 
 #endif /* CONFIG_HIGH_RES_TIMERS */
 
@@ -890,10 +853,7 @@ static void __remove_hrtimer(struct hrtimer *timer,
                              struct hrtimer_clock_base *base,
                              unsigned long newstate, int reprogram)
 {
-        /* High res. callback list. NOP for !HIGHRES */
-        if (hrtimer_cb_pending(timer))
-                hrtimer_remove_cb_pending(timer);
-        else {
+        if (timer->state & HRTIMER_STATE_ENQUEUED) {
                 /*
                  * Remove the timer from the rbtree and replace the
                  * first entry pointer if necessary.
@@ -953,7 +913,7 @@ hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_n
 {
         struct hrtimer_clock_base *base, *new_base;
         unsigned long flags;
-        int ret, raise;
+        int ret;
 
         base = lock_hrtimer_base(timer, &flags);
 
@@ -988,26 +948,8 @@ hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_n
         enqueue_hrtimer(timer, new_base,
                         new_base->cpu_base == &__get_cpu_var(hrtimer_bases));
 
-        /*
-         * The timer may be expired and moved to the cb_pending
-         * list. We can not raise the softirq with base lock held due
-         * to a possible deadlock with runqueue lock.
-         */
-        raise = timer->state == HRTIMER_STATE_PENDING;
-
-        /*
-         * We use preempt_disable to prevent this task from migrating after
-         * setting up the softirq and raising it. Otherwise, if me migrate
-         * we will raise the softirq on the wrong CPU.
-         */
-        preempt_disable();
-
         unlock_hrtimer_base(timer, &flags);
 
-        if (raise)
-                hrtimer_raise_softirq();
-        preempt_enable();
-
         return ret;
 }
 EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
@@ -1192,75 +1134,6 @@ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
 }
 EXPORT_SYMBOL_GPL(hrtimer_get_res);
 
-static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base)
-{
-        spin_lock_irq(&cpu_base->lock);
-
-        while (!list_empty(&cpu_base->cb_pending)) {
-                enum hrtimer_restart (*fn)(struct hrtimer *);
-                struct hrtimer *timer;
-                int restart;
-                int emulate_hardirq_ctx = 0;
-
-                timer = list_entry(cpu_base->cb_pending.next,
-                                   struct hrtimer, cb_entry);
-
-                debug_hrtimer_deactivate(timer);
-                timer_stats_account_hrtimer(timer);
-
-                fn = timer->function;
-                /*
-                 * A timer might have been added to the cb_pending list
-                 * when it was migrated during a cpu-offline operation.
-                 * Emulate hardirq context for such timers.
-                 */
-                if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU ||
-                    timer->cb_mode == HRTIMER_CB_IRQSAFE_UNLOCKED)
-                        emulate_hardirq_ctx = 1;
-
-                __remove_hrtimer(timer, timer->base, HRTIMER_STATE_CALLBACK, 0);
-                spin_unlock_irq(&cpu_base->lock);
-
-                if (unlikely(emulate_hardirq_ctx)) {
-                        local_irq_disable();
-                        restart = fn(timer);
-                        local_irq_enable();
-                } else
-                        restart = fn(timer);
-
-                spin_lock_irq(&cpu_base->lock);
-
-                timer->state &= ~HRTIMER_STATE_CALLBACK;
-                if (restart == HRTIMER_RESTART) {
-                        BUG_ON(hrtimer_active(timer));
-                        /*
-                         * Enqueue the timer, allow reprogramming of the event
-                         * device
-                         */
-                        enqueue_hrtimer(timer, timer->base, 1);
-                } else if (hrtimer_active(timer)) {
-                        /*
-                         * If the timer was rearmed on another CPU, reprogram
-                         * the event device.
-                         */
-                        struct hrtimer_clock_base *base = timer->base;
-
-                        if (base->first == &timer->node &&
-                            hrtimer_reprogram(timer, base)) {
-                                /*
-                                 * Timer is expired. Thus move it from tree to
-                                 * pending list again.
-                                 */
-                                __remove_hrtimer(timer, base,
-                                                 HRTIMER_STATE_PENDING, 0);
-                                list_add_tail(&timer->cb_entry,
-                                              &base->cpu_base->cb_pending);
-                        }
-                }
-        }
-        spin_unlock_irq(&cpu_base->lock);
-}
-
 static void __run_hrtimer(struct hrtimer *timer)
 {
         struct hrtimer_clock_base *base = timer->base;
@@ -1268,25 +1141,21 @@ static void __run_hrtimer(struct hrtimer *timer)
         enum hrtimer_restart (*fn)(struct hrtimer *);
         int restart;
 
+        WARN_ON(!irqs_disabled());
+
         debug_hrtimer_deactivate(timer);
         __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0);
         timer_stats_account_hrtimer(timer);
-
         fn = timer->function;
-        if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU ||
-            timer->cb_mode == HRTIMER_CB_IRQSAFE_UNLOCKED) {
-                /*
-                 * Used for scheduler timers, avoid lock inversion with
-                 * rq->lock and tasklist_lock.
-                 *
-                 * These timers are required to deal with enqueue expiry
-                 * themselves and are not allowed to migrate.
-                 */
-                spin_unlock(&cpu_base->lock);
-                restart = fn(timer);
-                spin_lock(&cpu_base->lock);
-        } else
-                restart = fn(timer);
+
+        /*
+         * Because we run timers from hardirq context, there is no chance
+         * they get migrated to another cpu, therefore its safe to unlock
+         * the timer base.
+         */
+        spin_unlock(&cpu_base->lock);
+        restart = fn(timer);
+        spin_lock(&cpu_base->lock);
 
         /*
          * Note: We clear the CALLBACK bit after enqueue_hrtimer to avoid
@@ -1311,7 +1180,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
         struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
         struct hrtimer_clock_base *base;
         ktime_t expires_next, now;
-        int i, raise = 0;
+        int i;
 
         BUG_ON(!cpu_base->hres_active);
         cpu_base->nr_events++;
@@ -1360,16 +1229,6 @@ void hrtimer_interrupt(struct clock_event_device *dev)
                                 break;
                         }
 
-                        /* Move softirq callbacks to the pending list */
-                        if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) {
-                                __remove_hrtimer(timer, base,
-                                                 HRTIMER_STATE_PENDING, 0);
-                                list_add_tail(&timer->cb_entry,
-                                              &base->cpu_base->cb_pending);
-                                raise = 1;
-                                continue;
-                        }
-
                         __run_hrtimer(timer);
                 }
                 spin_unlock(&cpu_base->lock);
@@ -1383,10 +1242,6 @@ void hrtimer_interrupt(struct clock_event_device *dev)
                 if (tick_program_event(expires_next, 0))
                         goto retry;
         }
-
-        /* Raise softirq ? */
-        if (raise)
-                raise_softirq(HRTIMER_SOFTIRQ);
 }
 
 /**
@@ -1413,11 +1268,6 @@ void hrtimer_peek_ahead_timers(void)
         local_irq_restore(flags);
 }
 
-static void run_hrtimer_softirq(struct softirq_action *h)
-{
-        run_hrtimer_pending(&__get_cpu_var(hrtimer_bases));
-}
-
 #endif  /* CONFIG_HIGH_RES_TIMERS */
 
 /*
@@ -1429,8 +1279,6 @@ static void run_hrtimer_softirq(struct softirq_action *h)
  */
 void hrtimer_run_pending(void)
 {
-        struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
-
         if (hrtimer_hres_active())
                 return;
 
@@ -1444,8 +1292,6 @@ void hrtimer_run_pending(void)
          */
         if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
                 hrtimer_switch_to_hres();
-
-        run_hrtimer_pending(cpu_base);
 }
 
 /*
@@ -1482,14 +1328,6 @@ void hrtimer_run_queues(void)
                                         hrtimer_get_expires_tv64(timer))
                                 break;
 
-                        if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) {
-                                __remove_hrtimer(timer, base,
-                                        HRTIMER_STATE_PENDING, 0);
-                                list_add_tail(&timer->cb_entry,
-                                        &base->cpu_base->cb_pending);
-                                continue;
-                        }
-
                         __run_hrtimer(timer);
                 }
                 spin_unlock(&cpu_base->lock);
@@ -1516,9 +1354,6 @@ void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
 {
         sl->timer.function = hrtimer_wakeup;
         sl->task = task;
-#ifdef CONFIG_HIGH_RES_TIMERS
-        sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED;
-#endif
 }
 
 static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
@@ -1655,18 +1490,16 @@ static void __cpuinit init_hrtimers_cpu(int cpu)
         for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
                 cpu_base->clock_base[i].cpu_base = cpu_base;
 
-        INIT_LIST_HEAD(&cpu_base->cb_pending);
         hrtimer_init_hres(cpu_base);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
 
-static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
-                                struct hrtimer_clock_base *new_base, int dcpu)
+static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
+                                struct hrtimer_clock_base *new_base)
 {
         struct hrtimer *timer;
         struct rb_node *node;
-        int raise = 0;
 
         while ((node = rb_first(&old_base->active))) {
                 timer = rb_entry(node, struct hrtimer, node);
@@ -1674,18 +1507,6 @@ static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
                 debug_hrtimer_deactivate(timer);
 
                 /*
-                 * Should not happen. Per CPU timers should be
-                 * canceled _before_ the migration code is called
-                 */
-                if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU) {
-                        __remove_hrtimer(timer, old_base,
-                                         HRTIMER_STATE_INACTIVE, 0);
-                        WARN(1, "hrtimer (%p %p)active but cpu %d dead\n",
-                             timer, timer->function, dcpu);
-                        continue;
-                }
-
-                /*
                  * Mark it as STATE_MIGRATE not INACTIVE otherwise the
                  * timer could be seen as !active and just vanish away
                  * under us on another CPU
@@ -1693,69 +1514,34 @@ static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
                 __remove_hrtimer(timer, old_base, HRTIMER_STATE_MIGRATE, 0);
                 timer->base = new_base;
                 /*
-                 * Enqueue the timer. Allow reprogramming of the event device
+                 * Enqueue the timers on the new cpu, but do not reprogram 
+                 * the timer as that would enable a deadlock between
+                 * hrtimer_enqueue_reprogramm() running the timer and us still
+                 * holding a nested base lock.
+                 *
+                 * Instead we tickle the hrtimer interrupt after the migration
+                 * is done, which will run all expired timers and re-programm
+                 * the timer device.
                  */
-                enqueue_hrtimer(timer, new_base, 1);
+                enqueue_hrtimer(timer, new_base, 0);
 
-#ifdef CONFIG_HIGH_RES_TIMERS
-                /*
-                 * Happens with high res enabled when the timer was
-                 * already expired and the callback mode is
-                 * HRTIMER_CB_IRQSAFE_UNLOCKED (hrtimer_sleeper). The
-                 * enqueue code does not move them to the soft irq
-                 * pending list for performance/latency reasons, but
-                 * in the migration state, we need to do that
-                 * otherwise we end up with a stale timer.
-                 */
-                if (timer->state == HRTIMER_STATE_MIGRATE) {
-                        timer->state = HRTIMER_STATE_PENDING;
-                        list_add_tail(&timer->cb_entry,
-                                      &new_base->cpu_base->cb_pending);
-                        raise = 1;
-                }
-#endif
                 /* Clear the migration state bit */
                 timer->state &= ~HRTIMER_STATE_MIGRATE;
         }
-        return raise;
-}
-
-#ifdef CONFIG_HIGH_RES_TIMERS
-static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base,
-                                   struct hrtimer_cpu_base *new_base)
-{
-        struct hrtimer *timer;
-        int raise = 0;
-
-        while (!list_empty(&old_base->cb_pending)) {
-                timer = list_entry(old_base->cb_pending.next,
-                                   struct hrtimer, cb_entry);
-
-                __remove_hrtimer(timer, timer->base, HRTIMER_STATE_PENDING, 0);
-                timer->base = &new_base->clock_base[timer->base->index];
-                list_add_tail(&timer->cb_entry, &new_base->cb_pending);
-                raise = 1;
-        }
-        return raise;
-}
-#else
-static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base,
-                                   struct hrtimer_cpu_base *new_base)
-{
-        return 0;
 }
-#endif
 
-static void migrate_hrtimers(int cpu)
+static int migrate_hrtimers(int scpu)
 {
         struct hrtimer_cpu_base *old_base, *new_base;
-        int i, raise = 0;
+        int dcpu, i;
 
-        BUG_ON(cpu_online(cpu));
-        old_base = &per_cpu(hrtimer_bases, cpu);
+        BUG_ON(cpu_online(scpu));
+        old_base = &per_cpu(hrtimer_bases, scpu);
         new_base = &get_cpu_var(hrtimer_bases);
 
-        tick_cancel_sched_timer(cpu);
+        dcpu = smp_processor_id();
+
+        tick_cancel_sched_timer(scpu);
         /*
          * The caller is globally serialized and nobody else
          * takes two locks at once, deadlock is not possible.
@@ -1764,41 +1550,47 @@ static void migrate_hrtimers(int cpu)
         spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
 
         for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
-                if (migrate_hrtimer_list(&old_base->clock_base[i],
-                                         &new_base->clock_base[i], cpu))
-                        raise = 1;
+                migrate_hrtimer_list(&old_base->clock_base[i],
+                                     &new_base->clock_base[i]);
         }
 
-        if (migrate_hrtimer_pending(old_base, new_base))
-                raise = 1;
-
         spin_unlock(&old_base->lock);
         spin_unlock_irq(&new_base->lock);
         put_cpu_var(hrtimer_bases);
 
-        if (raise)
-                hrtimer_raise_softirq();
+        return dcpu;
+}
+
+static void tickle_timers(void *arg)
+{
+        hrtimer_peek_ahead_timers();
 }
+
 #endif /* CONFIG_HOTPLUG_CPU */
 
 static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self,
                                         unsigned long action, void *hcpu)
 {
-        unsigned int cpu = (long)hcpu;
+        int scpu = (long)hcpu;
 
         switch (action) {
 
         case CPU_UP_PREPARE:
         case CPU_UP_PREPARE_FROZEN:
-                init_hrtimers_cpu(cpu);
+                init_hrtimers_cpu(scpu);
                 break;
 
 #ifdef CONFIG_HOTPLUG_CPU
         case CPU_DEAD:
         case CPU_DEAD_FROZEN:
-                clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &cpu);
-                migrate_hrtimers(cpu);
+        {
+                int dcpu;
+
+                clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &scpu);
+                dcpu = migrate_hrtimers(scpu);
+                smp_call_function_single(dcpu, tickle_timers, NULL, 0);
                 break;
+        }
 #endif
 
         default:
@@ -1817,9 +1609,6 @@ void __init hrtimers_init(void)
         hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
                           (void *)(long)smp_processor_id());
         register_cpu_notifier(&hrtimers_nb);
-#ifdef CONFIG_HIGH_RES_TIMERS
-        open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
-#endif
 }
 
 /**
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 681c52dbfe22..4dd5b1edac98 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -3,3 +3,4 @@ obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
 obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
+obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index cc0f7321b8ce..650ce4102a63 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -40,6 +40,9 @@ unsigned long probe_irq_on(void)
          * flush such a longstanding irq before considering it as spurious.
          */
         for_each_irq_desc_reverse(i, desc) {
+                if (!desc)
+                        continue;
+
                 spin_lock_irq(&desc->lock);
                 if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
                         /*
@@ -68,6 +71,9 @@ unsigned long probe_irq_on(void)
          * happened in the previous stage, it may have masked itself)
          */
         for_each_irq_desc_reverse(i, desc) {
+                if (!desc)
+                        continue;
+
                 spin_lock_irq(&desc->lock);
                 if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
                         desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
@@ -86,6 +92,9 @@ unsigned long probe_irq_on(void)
          * Now filter out any obviously spurious interrupts
          */
         for_each_irq_desc(i, desc) {
+                if (!desc)
+                        continue;
+
                 spin_lock_irq(&desc->lock);
                 status = desc->status;
 
@@ -124,6 +133,9 @@ unsigned int probe_irq_mask(unsigned long val)
         int i;
 
         for_each_irq_desc(i, desc) {
+                if (!desc)
+                        continue;
+
                 spin_lock_irq(&desc->lock);
                 status = desc->status;
 
@@ -166,6 +178,9 @@ int probe_irq_off(unsigned long val)
         unsigned int status;
 
         for_each_irq_desc(i, desc) {
+                if (!desc)
+                        continue;
+
                 spin_lock_irq(&desc->lock);
                 status = desc->status;
 
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 10b5092e9bfe..6eb3c7952b64 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -24,9 +24,10 @@
  */
 void dynamic_irq_init(unsigned int irq)
 {
-        struct irq_desc *desc = irq_to_desc(irq);
+        struct irq_desc *desc;
         unsigned long flags;
 
+        desc = irq_to_desc(irq);
         if (!desc) {
                 WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
                 return;
@@ -124,6 +125,7 @@ int set_irq_type(unsigned int irq, unsigned int type)
                 return -ENODEV;
         }
 
+        type &= IRQ_TYPE_SENSE_MASK;
         if (type == IRQ_TYPE_NONE)
                 return 0;
 
@@ -352,6 +354,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
 
         spin_lock(&desc->lock);
         mask_ack_irq(desc, irq);
+        desc = irq_remap_to_desc(irq, desc);
 
         if (unlikely(desc->status & IRQ_INPROGRESS))
                 goto out_unlock;
@@ -429,6 +432,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
         desc->status &= ~IRQ_INPROGRESS;
 out:
         desc->chip->eoi(irq);
+        desc = irq_remap_to_desc(irq, desc);
 
         spin_unlock(&desc->lock);
 }
@@ -465,12 +469,14 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
                     !desc->action)) {
                 desc->status |= (IRQ_PENDING | IRQ_MASKED);
                 mask_ack_irq(desc, irq);
+                desc = irq_remap_to_desc(irq, desc);
                 goto out_unlock;
         }
         kstat_incr_irqs_this_cpu(irq, desc);
 
         /* Start handling the irq */
         desc->chip->ack(irq);
+        desc = irq_remap_to_desc(irq, desc);
 
         /* Mark the IRQ currently in progress.*/
         desc->status |= IRQ_INPROGRESS;
@@ -531,8 +537,10 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
         if (!noirqdebug)
                 note_interrupt(irq, desc, action_ret);
 
-        if (desc->chip->eoi)
+        if (desc->chip->eoi) {
                 desc->chip->eoi(irq);
+                desc = irq_remap_to_desc(irq, desc);
+        }
 }
 
 void
@@ -567,8 +575,10 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 
         /* Uninstall? */
         if (handle == handle_bad_irq) {
-                if (desc->chip != &no_irq_chip)
+                if (desc->chip != &no_irq_chip) {
                         mask_ack_irq(desc, irq);
+                        desc = irq_remap_to_desc(irq, desc);
+                }
                 desc->status |= IRQ_DISABLED;
                 desc->depth = 1;
         }
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index c815b42d0f5b..6492400cb50d 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -15,9 +15,16 @@
 #include <linux/random.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
+#include <linux/rculist.h>
+#include <linux/hash.h>
 
 #include "internals.h"
 
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-class:
+ */
+struct lock_class_key irq_desc_lock_class;
+
 /**
  * handle_bad_irq - handle spurious and unhandled irqs
  * @irq:       the interrupt number
@@ -49,6 +56,155 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
 int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
+void __init __attribute__((weak)) arch_early_irq_init(void)
+{
+}
+
+#ifdef CONFIG_SPARSE_IRQ
+static struct irq_desc irq_desc_init = {
+        .irq        = -1,
+        .status     = IRQ_DISABLED,
+        .chip       = &no_irq_chip,
+        .handle_irq = handle_bad_irq,
+        .depth      = 1,
+        .lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+#ifdef CONFIG_SMP
+        .affinity   = CPU_MASK_ALL
+#endif
+};
+
+void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
+{
+        unsigned long bytes;
+        char *ptr;
+        int node;
+
+        /* Compute how many bytes we need per irq and allocate them */
+        bytes = nr * sizeof(unsigned int);
+
+        node = cpu_to_node(cpu);
+        ptr = kzalloc_node(bytes, GFP_ATOMIC, node);
+        printk(KERN_DEBUG "  alloc kstat_irqs on cpu %d node %d\n", cpu, node);
+
+        if (ptr)
+                desc->kstat_irqs = (unsigned int *)ptr;
+}
+
+void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
+{
+}
+
+static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
+{
+        memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
+        desc->irq = irq;
+#ifdef CONFIG_SMP
+        desc->cpu = cpu;
+#endif
+        lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+        init_kstat_irqs(desc, cpu, nr_cpu_ids);
+        if (!desc->kstat_irqs) {
+                printk(KERN_ERR "can not alloc kstat_irqs\n");
+                BUG_ON(1);
+        }
+        arch_init_chip_data(desc, cpu);
+}
+
+/*
+ * Protect the sparse_irqs:
+ */
+DEFINE_SPINLOCK(sparse_irq_lock);
+
+struct irq_desc *irq_desc_ptrs[NR_IRQS] __read_mostly;
+
+static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
+        [0 ... NR_IRQS_LEGACY-1] = {
+                .irq        = -1,
+                .status     = IRQ_DISABLED,
+                .chip       = &no_irq_chip,
+                .handle_irq = handle_bad_irq,
+                .depth      = 1,
+                .lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+#ifdef CONFIG_SMP
+                .affinity   = CPU_MASK_ALL
+#endif
+        }
+};
+
+/* FIXME: use bootmem alloc ...*/
+static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
+
+void __init early_irq_init(void)
+{
+        struct irq_desc *desc;
+        int legacy_count;
+        int i;
+
+        desc = irq_desc_legacy;
+        legacy_count = ARRAY_SIZE(irq_desc_legacy);
+
+        for (i = 0; i < legacy_count; i++) {
+                desc[i].irq = i;
+                desc[i].kstat_irqs = kstat_irqs_legacy[i];
+
+                irq_desc_ptrs[i] = desc + i;
+        }
+
+        for (i = legacy_count; i < NR_IRQS; i++)
+                irq_desc_ptrs[i] = NULL;
+
+        arch_early_irq_init();
+}
+
+struct irq_desc *irq_to_desc(unsigned int irq)
+{
+        return (irq < NR_IRQS) ? irq_desc_ptrs[irq] : NULL;
+}
+
+struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+{
+        struct irq_desc *desc;
+        unsigned long flags;
+        int node;
+
+        if (irq >= NR_IRQS) {
+                printk(KERN_WARNING "irq >= NR_IRQS in irq_to_desc_alloc: %d %d\n",
+                                irq, NR_IRQS);
+                WARN_ON(1);
+                return NULL;
+        }
+
+        desc = irq_desc_ptrs[irq];
+        if (desc)
+                return desc;
+
+        spin_lock_irqsave(&sparse_irq_lock, flags);
+
+        /* We have to check it to avoid races with another CPU */
+        desc = irq_desc_ptrs[irq];
+        if (desc)
+                goto out_unlock;
+
+        node = cpu_to_node(cpu);
+        desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
+        printk(KERN_DEBUG "  alloc irq_desc for %d on cpu %d node %d\n",
+                 irq, cpu, node);
+        if (!desc) {
+                printk(KERN_ERR "can not alloc irq_desc\n");
+                BUG_ON(1);
+        }
+        init_one_irq_desc(irq, desc, cpu);
+
+        irq_desc_ptrs[irq] = desc;
+
+out_unlock:
+        spin_unlock_irqrestore(&sparse_irq_lock, flags);
+
+        return desc;
+}
+
+#else
+
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         [0 ... NR_IRQS-1] = {
                 .status = IRQ_DISABLED,
@@ -62,6 +218,8 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         }
 };
 
+#endif
+
 /*
  * What should we do if we get a hw irq event on an illegal vector?
  * Each architecture has to answer this themself.
@@ -179,8 +337,11 @@ unsigned int __do_IRQ(unsigned int irq)
                 /*
                  * No locking required for CPU-local interrupts:
                  */
-                if (desc->chip->ack)
+                if (desc->chip->ack) {
                         desc->chip->ack(irq);
+                        /* get new one */
+                        desc = irq_remap_to_desc(irq, desc);
+                }
                 if (likely(!(desc->status & IRQ_DISABLED))) {
                         action_ret = handle_IRQ_event(irq, desc->action);
                         if (!noirqdebug)
@@ -191,8 +352,10 @@ unsigned int __do_IRQ(unsigned int irq)
         }
 
         spin_lock(&desc->lock);
-        if (desc->chip->ack)
+        if (desc->chip->ack) {
                 desc->chip->ack(irq);
+                desc = irq_remap_to_desc(irq, desc);
+        }
         /*
          * REPLAY is when Linux resends an IRQ that was dropped earlier
          * WAITING is used by probe to mark irqs that are being tested
@@ -259,19 +422,25 @@ out:
 }
 #endif
 
-
-#ifdef CONFIG_TRACE_IRQFLAGS
-/*
- * lockdep: we want to handle all irq_desc locks as a single lock-class:
- */
-static struct lock_class_key irq_desc_lock_class;
-
 void early_init_irq_lock_class(void)
 {
         struct irq_desc *desc;
         int i;
 
-        for_each_irq_desc(i, desc)
+        for_each_irq_desc(i, desc) {
+                if (!desc)
+                        continue;
+
                 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+        }
+}
+
+#ifdef CONFIG_SPARSE_IRQ
+unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        return desc->kstat_irqs[cpu];
 }
 #endif
+EXPORT_SYMBOL(kstat_irqs_cpu);
+
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 64c1c7253dae..e6d0a43cc125 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -13,6 +13,11 @@ extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
                 unsigned long flags);
 
+extern struct lock_class_key irq_desc_lock_class;
+extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
+extern spinlock_t sparse_irq_lock;
+extern struct irq_desc *irq_desc_ptrs[NR_IRQS];
+
 #ifdef CONFIG_PROC_FS
 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 801addda3c43..540f6c49f3fa 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -370,16 +370,18 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
                 return 0;
         }
 
-        ret = chip->set_type(irq, flags & IRQF_TRIGGER_MASK);
+        /* caller masked out all except trigger mode flags */
+        ret = chip->set_type(irq, flags);
 
         if (ret)
                 pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
-                                (int)(flags & IRQF_TRIGGER_MASK),
-                                irq, chip->set_type);
+                                (int)flags, irq, chip->set_type);
         else {
+                if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+                        flags |= IRQ_LEVEL;
                 /* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
-                desc->status &= ~IRQ_TYPE_SENSE_MASK;
-                desc->status |= flags & IRQ_TYPE_SENSE_MASK;
+                desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
+                desc->status |= flags;
         }
 
         return ret;
@@ -459,7 +461,8 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 
                 /* Setup the type (level, edge polarity) if configured: */
                 if (new->flags & IRQF_TRIGGER_MASK) {
-                        ret = __irq_set_trigger(desc, irq, new->flags);
+                        ret = __irq_set_trigger(desc, irq,
+                                        new->flags & IRQF_TRIGGER_MASK);
 
                         if (ret) {
                                 spin_unlock_irqrestore(&desc->lock, flags);
@@ -673,6 +676,18 @@ int request_irq(unsigned int irq, irq_handler_t handler,
         struct irq_desc *desc;
         int retval;
 
+        /*
+         * handle_IRQ_event() always ignores IRQF_DISABLED except for
+         * the _first_ irqaction (sigh).  That can cause oopsing, but
+         * the behavior is classified as "will not fix" so we need to
+         * start nudging drivers away from using that idiom.
+         */
+        if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
+                        == (IRQF_SHARED|IRQF_DISABLED))
+                pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
+                                "guaranteed on shared IRQs\n",
+                                irq, devname);
+
 #ifdef CONFIG_LOCKDEP
         /*
          * Lockdep wants atomic interrupt handlers:
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
new file mode 100644
index 000000000000..089c3746358a
--- /dev/null
+++ b/kernel/irq/numa_migrate.c
@@ -0,0 +1,122 @@
+/*
+ * NUMA irq-desc migration code
+ *
+ * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to
+ * the new "home node" of the IRQ.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include "internals.h"
+
+static void init_copy_kstat_irqs(struct irq_desc *old_desc,
+                                 struct irq_desc *desc,
+                                 int cpu, int nr)
+{
+        unsigned long bytes;
+
+        init_kstat_irqs(desc, cpu, nr);
+
+        if (desc->kstat_irqs != old_desc->kstat_irqs) {
+                /* Compute how many bytes we need per irq and allocate them */
+                bytes = nr * sizeof(unsigned int);
+
+                memcpy(desc->kstat_irqs, old_desc->kstat_irqs, bytes);
+        }
+}
+
+static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
+{
+        if (old_desc->kstat_irqs == desc->kstat_irqs)
+                return;
+
+        kfree(old_desc->kstat_irqs);
+        old_desc->kstat_irqs = NULL;
+}
+
+static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
+                 struct irq_desc *desc, int cpu)
+{
+        memcpy(desc, old_desc, sizeof(struct irq_desc));
+        desc->cpu = cpu;
+        lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+        init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
+        arch_init_copy_chip_data(old_desc, desc, cpu);
+}
+
+static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
+{
+        free_kstat_irqs(old_desc, desc);
+        arch_free_chip_data(old_desc, desc);
+}
+
+static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
+                                                int cpu)
+{
+        struct irq_desc *desc;
+        unsigned int irq;
+        unsigned long flags;
+        int node;
+
+        irq = old_desc->irq;
+
+        spin_lock_irqsave(&sparse_irq_lock, flags);
+
+        /* We have to check it to avoid races with another CPU */
+        desc = irq_desc_ptrs[irq];
+
+        if (desc && old_desc != desc)
+                        goto out_unlock;
+
+        node = cpu_to_node(cpu);
+        desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
+        printk(KERN_DEBUG "  move irq_desc for %d to cpu %d node %d\n",
+                 irq, cpu, node);
+        if (!desc) {
+                printk(KERN_ERR "can not get new irq_desc for moving\n");
+                /* still use old one */
+                desc = old_desc;
+                goto out_unlock;
+        }
+        init_copy_one_irq_desc(irq, old_desc, desc, cpu);
+
+        irq_desc_ptrs[irq] = desc;
+
+        /* free the old one */
+        free_one_irq_desc(old_desc, desc);
+        kfree(old_desc);
+
+out_unlock:
+        spin_unlock_irqrestore(&sparse_irq_lock, flags);
+
+        return desc;
+}
+
+struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
+{
+        int old_cpu;
+        int node, old_node;
+
+        /* those all static, do move them */
+        if (desc->irq < NR_IRQS_LEGACY)
+                return desc;
+
+        old_cpu = desc->cpu;
+        printk(KERN_DEBUG
+                 "try to move irq_desc from cpu %d to %d\n", old_cpu, cpu);
+        if (old_cpu != cpu) {
+                node = cpu_to_node(cpu);
+                old_node = cpu_to_node(old_cpu);
+                if (old_node != node)
+                        desc = __real_move_irq_desc(desc, cpu);
+                else
+                        desc->cpu = cpu;
+        }
+
+        return desc;
+}
+
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index d257e7d6a8a4..f6b3440f05bc 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -243,7 +243,11 @@ void init_irq_proc(void)
         /*
          * Create entries for all existing IRQs.
          */
-        for_each_irq_desc(irq, desc)
+        for_each_irq_desc(irq, desc) {
+                if (!desc)
+                        continue;
+
                 register_irq_proc(irq, desc);
+        }
 }
 
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index dd364c11e56e..3738107531fd 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -91,6 +91,9 @@ static int misrouted_irq(int irq)
         int i, ok = 0;
 
         for_each_irq_desc(i, desc) {
+                if (!desc)
+                        continue;
+
                 if (!i)
                          continue;
 
@@ -112,6 +115,8 @@ static void poll_spurious_irqs(unsigned long dummy)
         for_each_irq_desc(i, desc) {
                 unsigned int status;
 
+                if (!desc)
+                        continue;
                 if (!i)
                          continue;
 
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 7b8b0f21a5b1..e694afa0eb8c 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -30,20 +30,19 @@
 #define all_var 0
 #endif
 
-/* These will be re-linked against their real values during the second link stage */
-extern const unsigned long kallsyms_addresses[] __attribute__((weak));
-extern const u8 kallsyms_names[] __attribute__((weak));
+extern const unsigned long kallsyms_addresses[];
+extern const u8 kallsyms_names[];
 
 /* tell the compiler that the count isn't in the small data section if the arch
  * has one (eg: FRV)
  */
 extern const unsigned long kallsyms_num_syms
-__attribute__((weak, section(".rodata")));
+        __attribute__((__section__(".rodata")));
 
-extern const u8 kallsyms_token_table[] __attribute__((weak));
-extern const u16 kallsyms_token_index[] __attribute__((weak));
+extern const u8 kallsyms_token_table[];
+extern const u16 kallsyms_token_index[];
 
-extern const unsigned long kallsyms_markers[] __attribute__((weak));
+extern const unsigned long kallsyms_markers[];
 
 static inline int is_kernel_inittext(unsigned long addr)
 {
@@ -168,9 +167,6 @@ static unsigned long get_symbol_pos(unsigned long addr,
         unsigned long symbol_start = 0, symbol_end = 0;
         unsigned long i, low, high, mid;
 
-        /* This kernel should never had been booted. */
-        BUG_ON(!kallsyms_addresses);
-
         /* do a binary search on the sorted kallsyms_addresses array */
         low = 0;
         high = kallsyms_num_syms;
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 3d3c3ea3a023..b46dbb908669 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -118,10 +118,10 @@ EXPORT_SYMBOL(request_module);
 struct subprocess_info {
         struct work_struct work;
         struct completion *complete;
+        struct cred *cred;
         char *path;
         char **argv;
         char **envp;
-        struct key *ring;
         enum umh_wait wait;
         int retval;
         struct file *stdin;
@@ -134,19 +134,20 @@ struct subprocess_info {
 static int ____call_usermodehelper(void *data)
 {
         struct subprocess_info *sub_info = data;
-        struct key *new_session, *old_session;
         int retval;
 
-        /* Unblock all signals and set the session keyring. */
-        new_session = key_get(sub_info->ring);
+        BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
+        /* Unblock all signals */
         spin_lock_irq(&current->sighand->siglock);
-        old_session = __install_session_keyring(current, new_session);
         flush_signal_handlers(current, 1);
         sigemptyset(&current->blocked);
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
 
-        key_put(old_session);
+        /* Install the credentials */
+        commit_creds(sub_info->cred);
+        sub_info->cred = NULL;
 
         /* Install input pipe when needed */
         if (sub_info->stdin) {
@@ -185,6 +186,8 @@ void call_usermodehelper_freeinfo(struct subprocess_info *info)
 {
         if (info->cleanup)
                 (*info->cleanup)(info->argv, info->envp);
+        if (info->cred)
+                put_cred(info->cred);
         kfree(info);
 }
 EXPORT_SYMBOL(call_usermodehelper_freeinfo);
@@ -240,6 +243,8 @@ static void __call_usermodehelper(struct work_struct *work)
         pid_t pid;
         enum umh_wait wait = sub_info->wait;
 
+        BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
         /* CLONE_VFORK: wait until the usermode helper has execve'd
          * successfully We need the data structures to stay around
          * until that is done.  */
@@ -362,6 +367,9 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
         sub_info->path = path;
         sub_info->argv = argv;
         sub_info->envp = envp;
+        sub_info->cred = prepare_usermodehelper_creds();
+        if (!sub_info->cred)
+                return NULL;
 
   out:
         return sub_info;
@@ -376,7 +384,13 @@ EXPORT_SYMBOL(call_usermodehelper_setup);
 void call_usermodehelper_setkeys(struct subprocess_info *info,
                                  struct key *session_keyring)
 {
-        info->ring = session_keyring;
+#ifdef CONFIG_KEYS
+        struct thread_group_cred *tgcred = info->cred->tgcred;
+        key_put(tgcred->session_keyring);
+        tgcred->session_keyring = key_get(session_keyring);
+#else
+        BUG();
+#endif
 }
 EXPORT_SYMBOL(call_usermodehelper_setkeys);
 
@@ -444,6 +458,8 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info,
         DECLARE_COMPLETION_ONSTACK(done);
         int retval = 0;
 
+        BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
         helper_lock();
         if (sub_info->path[0] == '\0')
                 goto out;
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 8e7a7ce3ed0a..4fbc456f393d 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -21,6 +21,9 @@ static DEFINE_SPINLOCK(kthread_create_lock);
 static LIST_HEAD(kthread_create_list);
 struct task_struct *kthreadd_task;
 
+DEFINE_TRACE(sched_kthread_stop);
+DEFINE_TRACE(sched_kthread_stop_ret);
+
 struct kthread_create_info
 {
         /* Information passed to kthread() from kthreadd. */
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 5e7b45c56923..449db466bdbc 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -191,7 +191,7 @@ static int lstats_show(struct seq_file *m, void *v)
                                 latency_record[i].time,
                                 latency_record[i].max);
                         for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
-                                char sym[KSYM_NAME_LEN];
+                                char sym[KSYM_SYMBOL_LEN];
                                 char *c;
                                 if (!latency_record[i].backtrace[q])
                                         break;
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 46a404173db2..06b0c3568f0b 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -25,6 +25,7 @@
  * Thanks to Arjan van de Ven for coming up with the initial idea of
  * mapping lock dependencies runtime.
  */
+#define DISABLE_BRANCH_PROFILING
 #include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
@@ -136,16 +137,16 @@ static inline struct lock_class *hlock_class(struct held_lock *hlock)
 #ifdef CONFIG_LOCK_STAT
 static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], lock_stats);
 
-static int lock_contention_point(struct lock_class *class, unsigned long ip)
+static int lock_point(unsigned long points[], unsigned long ip)
 {
         int i;
 
-        for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) {
-                if (class->contention_point[i] == 0) {
-                        class->contention_point[i] = ip;
+        for (i = 0; i < LOCKSTAT_POINTS; i++) {
+                if (points[i] == 0) {
+                        points[i] = ip;
                         break;
                 }
-                if (class->contention_point[i] == ip)
+                if (points[i] == ip)
                         break;
         }
 
@@ -185,6 +186,9 @@ struct lock_class_stats lock_stats(struct lock_class *class)
                 for (i = 0; i < ARRAY_SIZE(stats.contention_point); i++)
                         stats.contention_point[i] += pcs->contention_point[i];
 
+                for (i = 0; i < ARRAY_SIZE(stats.contending_point); i++)
+                        stats.contending_point[i] += pcs->contending_point[i];
+
                 lock_time_add(&pcs->read_waittime, &stats.read_waittime);
                 lock_time_add(&pcs->write_waittime, &stats.write_waittime);
 
@@ -209,6 +213,7 @@ void clear_lock_stats(struct lock_class *class)
                 memset(cpu_stats, 0, sizeof(struct lock_class_stats));
         }
         memset(class->contention_point, 0, sizeof(class->contention_point));
+        memset(class->contending_point, 0, sizeof(class->contending_point));
 }
 
 static struct lock_class_stats *get_lock_stats(struct lock_class *class)
@@ -287,14 +292,12 @@ void lockdep_off(void)
 {
         current->lockdep_recursion++;
 }
-
 EXPORT_SYMBOL(lockdep_off);
 
 void lockdep_on(void)
 {
         current->lockdep_recursion--;
 }
-
 EXPORT_SYMBOL(lockdep_on);
 
 /*
@@ -576,7 +579,8 @@ static void print_lock_class_header(struct lock_class *class, int depth)
 /*
  * printk all lock dependencies starting at <entry>:
  */
-static void print_lock_dependencies(struct lock_class *class, int depth)
+static void __used
+print_lock_dependencies(struct lock_class *class, int depth)
 {
         struct lock_list *entry;
 
@@ -2508,7 +2512,6 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
         if (subclass)
                 register_lock_class(lock, subclass, 1);
 }
-
 EXPORT_SYMBOL_GPL(lockdep_init_map);
 
 /*
@@ -2689,8 +2692,9 @@ static int check_unlock(struct task_struct *curr, struct lockdep_map *lock,
 }
 
 static int
-__lock_set_subclass(struct lockdep_map *lock,
-                    unsigned int subclass, unsigned long ip)
+__lock_set_class(struct lockdep_map *lock, const char *name,
+                 struct lock_class_key *key, unsigned int subclass,
+                 unsigned long ip)
 {
         struct task_struct *curr = current;
         struct held_lock *hlock, *prev_hlock;
@@ -2717,6 +2721,7 @@ __lock_set_subclass(struct lockdep_map *lock,
         return print_unlock_inbalance_bug(curr, lock, ip);
 
 found_it:
+        lockdep_init_map(lock, name, key, 0);
         class = register_lock_class(lock, subclass, 0);
         hlock->class_idx = class - lock_classes + 1;
 
@@ -2901,9 +2906,9 @@ static void check_flags(unsigned long flags)
 #endif
 }
 
-void
-lock_set_subclass(struct lockdep_map *lock,
-                  unsigned int subclass, unsigned long ip)
+void lock_set_class(struct lockdep_map *lock, const char *name,
+                    struct lock_class_key *key, unsigned int subclass,
+                    unsigned long ip)
 {
         unsigned long flags;
 
@@ -2913,13 +2918,12 @@ lock_set_subclass(struct lockdep_map *lock,
         raw_local_irq_save(flags);
         current->lockdep_recursion = 1;
         check_flags(flags);
-        if (__lock_set_subclass(lock, subclass, ip))
+        if (__lock_set_class(lock, name, key, subclass, ip))
                 check_chain_key(current);
         current->lockdep_recursion = 0;
         raw_local_irq_restore(flags);
 }
-
-EXPORT_SYMBOL_GPL(lock_set_subclass);
+EXPORT_SYMBOL_GPL(lock_set_class);
 
 /*
  * We are not always called with irqs disabled - do that here,
@@ -2943,7 +2947,6 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
         current->lockdep_recursion = 0;
         raw_local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL_GPL(lock_acquire);
 
 void lock_release(struct lockdep_map *lock, int nested,
@@ -2961,7 +2964,6 @@ void lock_release(struct lockdep_map *lock, int nested,
         current->lockdep_recursion = 0;
         raw_local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL_GPL(lock_release);
 
 #ifdef CONFIG_LOCK_STAT
@@ -2999,7 +3001,7 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip)
         struct held_lock *hlock, *prev_hlock;
         struct lock_class_stats *stats;
         unsigned int depth;
-        int i, point;
+        int i, contention_point, contending_point;
 
         depth = curr->lockdep_depth;
         if (DEBUG_LOCKS_WARN_ON(!depth))
@@ -3023,18 +3025,22 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip)
 found_it:
         hlock->waittime_stamp = sched_clock();
 
-        point = lock_contention_point(hlock_class(hlock), ip);
+        contention_point = lock_point(hlock_class(hlock)->contention_point, ip);
+        contending_point = lock_point(hlock_class(hlock)->contending_point,
+                                      lock->ip);
 
         stats = get_lock_stats(hlock_class(hlock));
-        if (point < ARRAY_SIZE(stats->contention_point))
-                stats->contention_point[point]++;
+        if (contention_point < LOCKSTAT_POINTS)
+                stats->contention_point[contention_point]++;
+        if (contending_point < LOCKSTAT_POINTS)
+                stats->contending_point[contending_point]++;
         if (lock->cpu != smp_processor_id())
                 stats->bounces[bounce_contended + !!hlock->read]++;
         put_lock_stats(stats);
 }
 
 static void
-__lock_acquired(struct lockdep_map *lock)
+__lock_acquired(struct lockdep_map *lock, unsigned long ip)
 {
         struct task_struct *curr = current;
         struct held_lock *hlock, *prev_hlock;
@@ -3083,6 +3089,7 @@ found_it:
         put_lock_stats(stats);
 
         lock->cpu = cpu;
+        lock->ip = ip;
 }
 
 void lock_contended(struct lockdep_map *lock, unsigned long ip)
@@ -3104,7 +3111,7 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
 }
 EXPORT_SYMBOL_GPL(lock_contended);
 
-void lock_acquired(struct lockdep_map *lock)
+void lock_acquired(struct lockdep_map *lock, unsigned long ip)
 {
         unsigned long flags;
 
@@ -3117,7 +3124,7 @@ void lock_acquired(struct lockdep_map *lock)
         raw_local_irq_save(flags);
         check_flags(flags);
         current->lockdep_recursion = 1;
-        __lock_acquired(lock);
+        __lock_acquired(lock, ip);
         current->lockdep_recursion = 0;
         raw_local_irq_restore(flags);
 }
@@ -3441,7 +3448,6 @@ retry:
         if (unlock)
                 read_unlock(&tasklist_lock);
 }
-
 EXPORT_SYMBOL_GPL(debug_show_all_locks);
 
 /*
@@ -3462,7 +3468,6 @@ void debug_show_held_locks(struct task_struct *task)
 {
                 __debug_show_held_locks(task);
 }
-
 EXPORT_SYMBOL_GPL(debug_show_held_locks);
 
 void lockdep_sys_exit(void)
diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index 20dbcbf9c7dd..13716b813896 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -470,11 +470,12 @@ static void seq_line(struct seq_file *m, char c, int offset, int length)
 
 static void snprint_time(char *buf, size_t bufsiz, s64 nr)
 {
-        unsigned long rem;
+        s64 div;
+        s32 rem;
 
         nr += 5; /* for display rounding */
-        rem = do_div(nr, 1000); /* XXX: do_div_signed */
-        snprintf(buf, bufsiz, "%lld.%02d", (long long)nr, (int)rem/10);
+        div = div_s64_rem(nr, 1000, &rem);
+        snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
 }
 
 static void seq_time(struct seq_file *m, s64 time)
@@ -556,7 +557,7 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
         if (stats->read_holdtime.nr)
                 namelen += 2;
 
-        for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) {
+        for (i = 0; i < LOCKSTAT_POINTS; i++) {
                 char sym[KSYM_SYMBOL_LEN];
                 char ip[32];
 
@@ -573,6 +574,23 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
                                 stats->contention_point[i],
                                 ip, sym);
         }
+        for (i = 0; i < LOCKSTAT_POINTS; i++) {
+                char sym[KSYM_SYMBOL_LEN];
+                char ip[32];
+
+                if (class->contending_point[i] == 0)
+                        break;
+
+                if (!i)
+                        seq_line(m, '-', 40-namelen, namelen);
+
+                sprint_symbol(sym, class->contending_point[i]);
+                snprintf(ip, sizeof(ip), "[<%p>]",
+                                (void *)class->contending_point[i]);
+                seq_printf(m, "%40s %14lu %29s %s\n", name,
+                                stats->contending_point[i],
+                                ip, sym);
+        }
         if (i) {
                 seq_puts(m, "\n");
                 seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1));
@@ -582,7 +600,7 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 
 static void seq_header(struct seq_file *m)
 {
-        seq_printf(m, "lock_stat version 0.2\n");
+        seq_printf(m, "lock_stat version 0.3\n");
         seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
         seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
                         "%14s %14s\n",
diff --git a/kernel/marker.c b/kernel/marker.c
index e9c6b2bc9400..ea54f2647868 100644
--- a/kernel/marker.c
+++ b/kernel/marker.c
@@ -43,6 +43,7 @@ static DEFINE_MUTEX(markers_mutex);
  */
 #define MARKER_HASH_BITS 6
 #define MARKER_TABLE_SIZE (1 << MARKER_HASH_BITS)
+static struct hlist_head marker_table[MARKER_TABLE_SIZE];
 
 /*
  * Note about RCU :
@@ -64,11 +65,10 @@ struct marker_entry {
         void *oldptr;
         int rcu_pending;
         unsigned char ptype:1;
+        unsigned char format_allocated:1;
         char name[0];   /* Contains name'\0'format'\0' */
 };
 
-static struct hlist_head marker_table[MARKER_TABLE_SIZE];
-
 /**
  * __mark_empty_function - Empty probe callback
  * @probe_private: probe private data
@@ -81,7 +81,7 @@ static struct hlist_head marker_table[MARKER_TABLE_SIZE];
  * though the function pointer change and the marker enabling are two distinct
  * operations that modifies the execution flow of preemptible code.
  */
-void __mark_empty_function(void *probe_private, void *call_private,
+notrace void __mark_empty_function(void *probe_private, void *call_private,
         const char *fmt, va_list *args)
 {
 }
@@ -97,7 +97,8 @@ EXPORT_SYMBOL_GPL(__mark_empty_function);
  * need to put a full smp_rmb() in this branch. This is why we do not use
  * rcu_dereference() for the pointer read.
  */
-void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
+notrace void marker_probe_cb(const struct marker *mdata,
+                void *call_private, ...)
 {
         va_list args;
         char ptype;
@@ -107,7 +108,7 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
          * sure the teardown of the callbacks can be done correctly when they
          * are in modules and they insure RCU read coherency.
          */
-        rcu_read_lock_sched();
+        rcu_read_lock_sched_notrace();
         ptype = mdata->ptype;
         if (likely(!ptype)) {
                 marker_probe_func *func;
@@ -145,7 +146,7 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
                         va_end(args);
                 }
         }
-        rcu_read_unlock_sched();
+        rcu_read_unlock_sched_notrace();
 }
 EXPORT_SYMBOL_GPL(marker_probe_cb);
 
@@ -157,12 +158,13 @@ EXPORT_SYMBOL_GPL(marker_probe_cb);
  *
  * Should be connected to markers "MARK_NOARGS".
  */
-void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
+static notrace void marker_probe_cb_noarg(const struct marker *mdata,
+                void *call_private, ...)
 {
         va_list args;   /* not initialized */
         char ptype;
 
-        rcu_read_lock_sched();
+        rcu_read_lock_sched_notrace();
         ptype = mdata->ptype;
         if (likely(!ptype)) {
                 marker_probe_func *func;
@@ -195,9 +197,8 @@ void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
                         multi[i].func(multi[i].probe_private, call_private,
                                 mdata->format, &args);
         }
-        rcu_read_unlock_sched();
+        rcu_read_unlock_sched_notrace();
 }
-EXPORT_SYMBOL_GPL(marker_probe_cb_noarg);
 
 static void free_old_closure(struct rcu_head *head)
 {
@@ -416,6 +417,7 @@ static struct marker_entry *add_marker(const char *name, const char *format)
         e->single.probe_private = NULL;
         e->multi = NULL;
         e->ptype = 0;
+        e->format_allocated = 0;
         e->refcount = 0;
         e->rcu_pending = 0;
         hlist_add_head(&e->hlist, head);
@@ -447,6 +449,8 @@ static int remove_marker(const char *name)
         if (e->single.func != __mark_empty_function)
                 return -EBUSY;
         hlist_del(&e->hlist);
+        if (e->format_allocated)
+                kfree(e->format);
         /* Make sure the call_rcu has been executed */
         if (e->rcu_pending)
                 rcu_barrier_sched();
@@ -457,57 +461,34 @@ static int remove_marker(const char *name)
 /*
  * Set the mark_entry format to the format found in the element.
  */
-static int marker_set_format(struct marker_entry **entry, const char *format)
+static int marker_set_format(struct marker_entry *entry, const char *format)
 {
-        struct marker_entry *e;
-        size_t name_len = strlen((*entry)->name) + 1;
-        size_t format_len = strlen(format) + 1;
-
-
-        e = kmalloc(sizeof(struct marker_entry) + name_len + format_len,
-                        GFP_KERNEL);
-        if (!e)
+        entry->format = kstrdup(format, GFP_KERNEL);
+        if (!entry->format)
                 return -ENOMEM;
-        memcpy(&e->name[0], (*entry)->name, name_len);
-        e->format = &e->name[name_len];
-        memcpy(e->format, format, format_len);
-        if (strcmp(e->format, MARK_NOARGS) == 0)
-                e->call = marker_probe_cb_noarg;
-        else
-                e->call = marker_probe_cb;
-        e->single = (*entry)->single;
-        e->multi = (*entry)->multi;
-        e->ptype = (*entry)->ptype;
-        e->refcount = (*entry)->refcount;
-        e->rcu_pending = 0;
-        hlist_add_before(&e->hlist, &(*entry)->hlist);
-        hlist_del(&(*entry)->hlist);
-        /* Make sure the call_rcu has been executed */
-        if ((*entry)->rcu_pending)
-                rcu_barrier_sched();
-        kfree(*entry);
-        *entry = e;
+        entry->format_allocated = 1;
+
         trace_mark(core_marker_format, "name %s format %s",
-                        e->name, e->format);
+                        entry->name, entry->format);
         return 0;
 }
 
 /*
  * Sets the probe callback corresponding to one marker.
  */
-static int set_marker(struct marker_entry **entry, struct marker *elem,
+static int set_marker(struct marker_entry *entry, struct marker *elem,
                 int active)
 {
-        int ret;
-        WARN_ON(strcmp((*entry)->name, elem->name) != 0);
+        int ret = 0;
+        WARN_ON(strcmp(entry->name, elem->name) != 0);
 
-        if ((*entry)->format) {
-                if (strcmp((*entry)->format, elem->format) != 0) {
+        if (entry->format) {
+                if (strcmp(entry->format, elem->format) != 0) {
                         printk(KERN_NOTICE
                                 "Format mismatch for probe %s "
                                 "(%s), marker (%s)\n",
-                                (*entry)->name,
-                                (*entry)->format,
+                                entry->name,
+                                entry->format,
                                 elem->format);
                         return -EPERM;
                 }
@@ -523,37 +504,67 @@ static int set_marker(struct marker_entry **entry, struct marker *elem,
          * pass from a "safe" callback (with argument) to an "unsafe"
          * callback (does not set arguments).
          */
-        elem->call = (*entry)->call;
+        elem->call = entry->call;
         /*
          * Sanity check :
          * We only update the single probe private data when the ptr is
          * set to a _non_ single probe! (0 -> 1 and N -> 1, N != 1)
          */
         WARN_ON(elem->single.func != __mark_empty_function
-                && elem->single.probe_private
-                != (*entry)->single.probe_private &&
-                !elem->ptype);
-        elem->single.probe_private = (*entry)->single.probe_private;
+                && elem->single.probe_private != entry->single.probe_private
+                && !elem->ptype);
+        elem->single.probe_private = entry->single.probe_private;
         /*
          * Make sure the private data is valid when we update the
          * single probe ptr.
          */
         smp_wmb();
-        elem->single.func = (*entry)->single.func;
+        elem->single.func = entry->single.func;
         /*
          * We also make sure that the new probe callbacks array is consistent
          * before setting a pointer to it.
          */
-        rcu_assign_pointer(elem->multi, (*entry)->multi);
+        rcu_assign_pointer(elem->multi, entry->multi);
         /*
          * Update the function or multi probe array pointer before setting the
          * ptype.
          */
         smp_wmb();
-        elem->ptype = (*entry)->ptype;
+        elem->ptype = entry->ptype;
+
+        if (elem->tp_name && (active ^ elem->state)) {
+                WARN_ON(!elem->tp_cb);
+                /*
+                 * It is ok to directly call the probe registration because type
+                 * checking has been done in the __trace_mark_tp() macro.
+                 */
+
+                if (active) {
+                        /*
+                         * try_module_get should always succeed because we hold
+                         * lock_module() to get the tp_cb address.
+                         */
+                        ret = try_module_get(__module_text_address(
+                                (unsigned long)elem->tp_cb));
+                        BUG_ON(!ret);
+                        ret = tracepoint_probe_register_noupdate(
+                                elem->tp_name,
+                                elem->tp_cb);
+                } else {
+                        ret = tracepoint_probe_unregister_noupdate(
+                                elem->tp_name,
+                                elem->tp_cb);
+                        /*
+                         * tracepoint_probe_update_all() must be called
+                         * before the module containing tp_cb is unloaded.
+                         */
+                        module_put(__module_text_address(
+                                (unsigned long)elem->tp_cb));
+                }
+        }
         elem->state = active;
 
-        return 0;
+        return ret;
 }
 
 /*
@@ -564,7 +575,24 @@ static int set_marker(struct marker_entry **entry, struct marker *elem,
  */
 static void disable_marker(struct marker *elem)
 {
+        int ret;
+
         /* leave "call" as is. It is known statically. */
+        if (elem->tp_name && elem->state) {
+                WARN_ON(!elem->tp_cb);
+                /*
+                 * It is ok to directly call the probe registration because type
+                 * checking has been done in the __trace_mark_tp() macro.
+                 */
+                ret = tracepoint_probe_unregister_noupdate(elem->tp_name,
+                        elem->tp_cb);
+                WARN_ON(ret);
+                /*
+                 * tracepoint_probe_update_all() must be called
+                 * before the module containing tp_cb is unloaded.
+                 */
+                module_put(__module_text_address((unsigned long)elem->tp_cb));
+        }
         elem->state = 0;
         elem->single.func = __mark_empty_function;
         /* Update the function before setting the ptype */
@@ -594,8 +622,7 @@ void marker_update_probe_range(struct marker *begin,
         for (iter = begin; iter < end; iter++) {
                 mark_entry = get_marker(iter->name);
                 if (mark_entry) {
-                        set_marker(&mark_entry, iter,
-                                        !!mark_entry->refcount);
+                        set_marker(mark_entry, iter, !!mark_entry->refcount);
                         /*
                          * ignore error, continue
                          */
@@ -629,6 +656,7 @@ static void marker_update_probes(void)
         marker_update_probe_range(__start___markers, __stop___markers);
         /* Markers in modules. */
         module_update_markers();
+        tracepoint_probe_update_all();
 }
 
 /**
@@ -657,7 +685,7 @@ int marker_probe_register(const char *name, const char *format,
                         ret = PTR_ERR(entry);
         } else if (format) {
                 if (!entry->format)
-                        ret = marker_set_format(&entry, format);
+                        ret = marker_set_format(entry, format);
                 else if (strcmp(entry->format, format))
                         ret = -EPERM;
         }
@@ -676,10 +704,11 @@ int marker_probe_register(const char *name, const char *format,
                 goto end;
         }
         mutex_unlock(&markers_mutex);
-        marker_update_probes();         /* may update entry */
+        marker_update_probes();
         mutex_lock(&markers_mutex);
         entry = get_marker(name);
-        WARN_ON(!entry);
+        if (!entry)
+                goto end;
         if (entry->rcu_pending)
                 rcu_barrier_sched();
         entry->oldptr = old;
@@ -720,7 +749,7 @@ int marker_probe_unregister(const char *name,
                 rcu_barrier_sched();
         old = marker_entry_remove_probe(entry, probe, probe_private);
         mutex_unlock(&markers_mutex);
-        marker_update_probes();         /* may update entry */
+        marker_update_probes();
         mutex_lock(&markers_mutex);
         entry = get_marker(name);
         if (!entry)
@@ -801,10 +830,11 @@ int marker_probe_unregister_private_data(marker_probe_func *probe,
                 rcu_barrier_sched();
         old = marker_entry_remove_probe(entry, NULL, probe_private);
         mutex_unlock(&markers_mutex);
-        marker_update_probes();         /* may update entry */
+        marker_update_probes();
         mutex_lock(&markers_mutex);
         entry = get_marker_from_private_data(probe, probe_private);
-        WARN_ON(!entry);
+        if (!entry)
+                goto end;
         if (entry->rcu_pending)
                 rcu_barrier_sched();
         entry->oldptr = old;
@@ -848,8 +878,6 @@ void *marker_get_private_data(const char *name, marker_probe_func *probe,
                         if (!e->ptype) {
                                 if (num == 0 && e->single.func == probe)
                                         return e->single.probe_private;
-                                else
-                                        break;
                         } else {
                                 struct marker_probe_closure *closure;
                                 int match = 0;
@@ -861,8 +889,42 @@ void *marker_get_private_data(const char *name, marker_probe_func *probe,
                                                 return closure[i].probe_private;
                                 }
                         }
+                        break;
                 }
         }
         return ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL_GPL(marker_get_private_data);
+
+#ifdef CONFIG_MODULES
+
+int marker_module_notify(struct notifier_block *self,
+                         unsigned long val, void *data)
+{
+        struct module *mod = data;
+
+        switch (val) {
+        case MODULE_STATE_COMING:
+                marker_update_probe_range(mod->markers,
+                        mod->markers + mod->num_markers);
+                break;
+        case MODULE_STATE_GOING:
+                marker_update_probe_range(mod->markers,
+                        mod->markers + mod->num_markers);
+                break;
+        }
+        return 0;
+}
+
+struct notifier_block marker_module_nb = {
+        .notifier_call = marker_module_notify,
+        .priority = 0,
+};
+
+static int init_markers(void)
+{
+        return register_module_notifier(&marker_module_nb);
+}
+__initcall(init_markers);
+
+#endif /* CONFIG_MODULES */
diff --git a/kernel/module.c b/kernel/module.c
index 1f4cc00e0c20..dd2a54155b54 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2184,24 +2184,15 @@ static noinline struct module *load_module(void __user *umod,
                 struct mod_debug *debug;
                 unsigned int num_debug;
 
-#ifdef CONFIG_MARKERS
-                marker_update_probe_range(mod->markers,
-                        mod->markers + mod->num_markers);
-#endif
                 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
                                      sizeof(*debug), &num_debug);
                 dynamic_printk_setup(debug, num_debug);
-
-#ifdef CONFIG_TRACEPOINTS
-                tracepoint_update_probe_range(mod->tracepoints,
-                        mod->tracepoints + mod->num_tracepoints);
-#endif
         }
 
         /* sechdrs[0].sh_size is always zero */
         mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
                             sizeof(*mseg), &num_mcount);
-        ftrace_init_module(mseg, mseg + num_mcount);
+        ftrace_init_module(mod, mseg, mseg + num_mcount);
 
         err = module_finalize(hdr, sechdrs, mod);
         if (err < 0)
@@ -2713,7 +2704,7 @@ int is_module_address(unsigned long addr)
 
 
 /* Is this a valid kernel address? */
-struct module *__module_text_address(unsigned long addr)
+__notrace_funcgraph struct module *__module_text_address(unsigned long addr)
 {
         struct module *mod;
 
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 12c779dc65d4..4f45d4b658ef 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -59,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init);
  * We also put the fastpath first in the kernel image, to make sure the
  * branch is predicted by the CPU as default-untaken.
  */
-static void noinline __sched
+static __used noinline void __sched
 __mutex_lock_slowpath(atomic_t *lock_count);
 
 /***
@@ -96,7 +96,7 @@ void inline __sched mutex_lock(struct mutex *lock)
 EXPORT_SYMBOL(mutex_lock);
 #endif
 
-static noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);
+static __used noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);
 
 /***
  * mutex_unlock - release the mutex
@@ -184,7 +184,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
         }
 
 done:
-        lock_acquired(&lock->dep_map);
+        lock_acquired(&lock->dep_map, ip);
         /* got the lock - rejoice! */
         mutex_remove_waiter(lock, &waiter, task_thread_info(task));
         debug_mutex_set_owner(lock, task_thread_info(task));
@@ -268,7 +268,7 @@ __mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
 /*
  * Release the lock, slowpath:
  */
-static noinline void
+static __used noinline void
 __mutex_unlock_slowpath(atomic_t *lock_count)
 {
         __mutex_unlock_common_slowpath(lock_count, 1);
@@ -313,7 +313,7 @@ int __sched mutex_lock_killable(struct mutex *lock)
 }
 EXPORT_SYMBOL(mutex_lock_killable);
 
-static noinline void __sched
+static __used noinline void __sched
 __mutex_lock_slowpath(atomic_t *lock_count)
 {
         struct mutex *lock = container_of(lock_count, struct mutex, count);
diff --git a/kernel/notifier.c b/kernel/notifier.c
index 4282c0a40a57..61d5aa5eced3 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -82,6 +82,14 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl,
 
         while (nb && nr_to_call) {
                 next_nb = rcu_dereference(nb->next);
+
+#ifdef CONFIG_DEBUG_NOTIFIERS
+                if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) {
+                        WARN(1, "Invalid notifier called!");
+                        nb = next_nb;
+                        continue;
+                }
+#endif
                 ret = nb->notifier_call(nb, val, v);
 
                 if (nr_calls)
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 1d3ef29a2583..63598dca2d0c 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -80,12 +80,6 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
                 goto out_pid;
         }
 
-        new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns);
-        if (IS_ERR(new_nsp->user_ns)) {
-                err = PTR_ERR(new_nsp->user_ns);
-                goto out_user;
-        }
-
         new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
         if (IS_ERR(new_nsp->net_ns)) {
                 err = PTR_ERR(new_nsp->net_ns);
@@ -95,9 +89,6 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
         return new_nsp;
 
 out_net:
-        if (new_nsp->user_ns)
-                put_user_ns(new_nsp->user_ns);
-out_user:
         if (new_nsp->pid_ns)
                 put_pid_ns(new_nsp->pid_ns);
 out_pid:
@@ -130,7 +121,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
         get_nsproxy(old_ns);
 
         if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-                                CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET)))
+                                CLONE_NEWPID | CLONE_NEWNET)))
                 return 0;
 
         if (!capable(CAP_SYS_ADMIN)) {
@@ -173,8 +164,6 @@ void free_nsproxy(struct nsproxy *ns)
                 put_ipc_ns(ns->ipc_ns);
         if (ns->pid_ns)
                 put_pid_ns(ns->pid_ns);
-        if (ns->user_ns)
-                put_user_ns(ns->user_ns);
         put_net(ns->net_ns);
         kmem_cache_free(nsproxy_cachep, ns);
 }
@@ -189,7 +178,7 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
         int err = 0;
 
         if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-                               CLONE_NEWUSER | CLONE_NEWNET)))
+                               CLONE_NEWNET)))
                 return 0;
 
         if (!capable(CAP_SYS_ADMIN))
diff --git a/kernel/panic.c b/kernel/panic.c
index 4d5088355bfe..13f06349a786 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -21,6 +21,7 @@
 #include <linux/debug_locks.h>
 #include <linux/random.h>
 #include <linux/kallsyms.h>
+#include <linux/dmi.h>
 
 int panic_on_oops;
 static unsigned long tainted_mask;
@@ -321,36 +322,27 @@ void oops_exit(void)
 }
 
 #ifdef WANT_WARN_ON_SLOWPATH
-void warn_on_slowpath(const char *file, int line)
-{
-        char function[KSYM_SYMBOL_LEN];
-        unsigned long caller = (unsigned long) __builtin_return_address(0);
-        sprint_symbol(function, caller);
-
-        printk(KERN_WARNING "------------[ cut here ]------------\n");
-        printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
-                line, function);
-        print_modules();
-        dump_stack();
-        print_oops_end_marker();
-        add_taint(TAINT_WARN);
-}
-EXPORT_SYMBOL(warn_on_slowpath);
-
-
 void warn_slowpath(const char *file, int line, const char *fmt, ...)
 {
         va_list args;
         char function[KSYM_SYMBOL_LEN];
         unsigned long caller = (unsigned long)__builtin_return_address(0);
+        const char *board;
+
         sprint_symbol(function, caller);
 
         printk(KERN_WARNING "------------[ cut here ]------------\n");
         printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
                 line, function);
-        va_start(args, fmt);
-        vprintk(fmt, args);
-        va_end(args);
+        board = dmi_get_system_info(DMI_PRODUCT_NAME);
+        if (board)
+                printk(KERN_WARNING "Hardware name: %s\n", board);
+
+        if (fmt) {
+                va_start(args, fmt);
+                vprintk(fmt, args);
+                va_end(args);
+        }
 
         print_modules();
         dump_stack();
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 895337b16a24..157de3a47832 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -58,21 +58,21 @@ void thread_group_cputime(
         struct task_struct *tsk,
         struct task_cputime *times)
 {
-        struct signal_struct *sig;
+        struct task_cputime *totals, *tot;
         int i;
-        struct task_cputime *tot;
 
-        sig = tsk->signal;
-        if (unlikely(!sig) || !sig->cputime.totals) {
+        totals = tsk->signal->cputime.totals;
+        if (!totals) {
                 times->utime = tsk->utime;
                 times->stime = tsk->stime;
                 times->sum_exec_runtime = tsk->se.sum_exec_runtime;
                 return;
         }
+
         times->stime = times->utime = cputime_zero;
         times->sum_exec_runtime = 0;
         for_each_possible_cpu(i) {
-                tot = per_cpu_ptr(tsk->signal->cputime.totals, i);
+                tot = per_cpu_ptr(totals, i);
                 times->utime = cputime_add(times->utime, tot->utime);
                 times->stime = cputime_add(times->stime, tot->stime);
                 times->sum_exec_runtime += tot->sum_exec_runtime;
@@ -311,7 +311,7 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
         struct task_cputime cputime;
 
         thread_group_cputime(p, &cputime);
-        switch (which_clock) {
+        switch (CPUCLOCK_WHICH(which_clock)) {
         default:
                 return -EINVAL;
         case CPUCLOCK_PROF:
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 5e79c662294b..887c63787de6 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -116,7 +116,7 @@ static DEFINE_SPINLOCK(idr_lock);
  *          must supply functions here, even if the function just returns
  *          ENOSYS.  The standard POSIX timer management code assumes the
  *          following: 1.) The k_itimer struct (sched.h) is used for the
- *          timer.  2.) The list, it_lock, it_clock, it_id and it_process
+ *          timer.  2.) The list, it_lock, it_clock, it_id and it_pid
  *          fields are not modified by timer code.
  *
  *          At this time all functions EXCEPT clock_nanosleep can be
@@ -197,6 +197,11 @@ static int common_timer_create(struct k_itimer *new_timer)
         return 0;
 }
 
+static int no_timer_create(struct k_itimer *new_timer)
+{
+        return -EOPNOTSUPP;
+}
+
 /*
  * Return nonzero if we know a priori this clockid_t value is bogus.
  */
@@ -248,6 +253,7 @@ static __init int init_posix_timers(void)
                 .clock_getres = hrtimer_get_res,
                 .clock_get = posix_get_monotonic_raw,
                 .clock_set = do_posix_clock_nosettime,
+                .timer_create = no_timer_create,
         };
 
         register_posix_clock(CLOCK_REALTIME, &clock_realtime);
@@ -313,7 +319,8 @@ void do_schedule_next_timer(struct siginfo *info)
 
 int posix_timer_event(struct k_itimer *timr, int si_private)
 {
-        int shared, ret;
+        struct task_struct *task;
+        int shared, ret = -1;
         /*
          * FIXME: if ->sigq is queued we can race with
          * dequeue_signal()->do_schedule_next_timer().
@@ -327,8 +334,13 @@ int posix_timer_event(struct k_itimer *timr, int si_private)
          */
         timr->sigq->info.si_sys_private = si_private;
 
-        shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
-        ret = send_sigqueue(timr->sigq, timr->it_process, shared);
+        rcu_read_lock();
+        task = pid_task(timr->it_pid, PIDTYPE_PID);
+        if (task) {
+                shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
+                ret = send_sigqueue(timr->sigq, task, shared);
+        }
+        rcu_read_unlock();
         /* If we failed to send the signal the timer stops. */
         return ret > 0;
 }
@@ -405,7 +417,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
         return ret;
 }
 
-static struct task_struct * good_sigevent(sigevent_t * event)
+static struct pid *good_sigevent(sigevent_t * event)
 {
         struct task_struct *rtn = current->group_leader;
 
@@ -419,7 +431,7 @@ static struct task_struct * good_sigevent(sigevent_t * event)
             ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
                 return NULL;
 
-        return rtn;
+        return task_pid(rtn);
 }
 
 void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
@@ -458,6 +470,7 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
                 idr_remove(&posix_timers_id, tmr->it_id);
                 spin_unlock_irqrestore(&idr_lock, flags);
         }
+        put_pid(tmr->it_pid);
         sigqueue_free(tmr->sigq);
         kmem_cache_free(posix_timers_cache, tmr);
 }
@@ -471,7 +484,6 @@ sys_timer_create(const clockid_t which_clock,
 {
         struct k_itimer *new_timer;
         int error, new_timer_id;
-        struct task_struct *process;
         sigevent_t event;
         int it_id_set = IT_ID_NOT_SET;
 
@@ -525,11 +537,9 @@ sys_timer_create(const clockid_t which_clock,
                         goto out;
                 }
                 rcu_read_lock();
-                process = good_sigevent(&event);
-                if (process)
-                        get_task_struct(process);
+                new_timer->it_pid = get_pid(good_sigevent(&event));
                 rcu_read_unlock();
-                if (!process) {
+                if (!new_timer->it_pid) {
                         error = -EINVAL;
                         goto out;
                 }
@@ -537,8 +547,7 @@ sys_timer_create(const clockid_t which_clock,
                 event.sigev_notify = SIGEV_SIGNAL;
                 event.sigev_signo = SIGALRM;
                 event.sigev_value.sival_int = new_timer->it_id;
-                process = current->group_leader;
-                get_task_struct(process);
+                new_timer->it_pid = get_pid(task_tgid(current));
         }
 
         new_timer->it_sigev_notify     = event.sigev_notify;
@@ -548,7 +557,7 @@ sys_timer_create(const clockid_t which_clock,
         new_timer->sigq->info.si_code  = SI_TIMER;
 
         spin_lock_irq(&current->sighand->siglock);
-        new_timer->it_process = process;
+        new_timer->it_signal = current->signal;
         list_add(&new_timer->list, &current->signal->posix_timers);
         spin_unlock_irq(&current->sighand->siglock);
 
@@ -583,8 +592,7 @@ static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags)
         timr = idr_find(&posix_timers_id, (int)timer_id);
         if (timr) {
                 spin_lock(&timr->it_lock);
-                if (timr->it_process &&
-                    same_thread_group(timr->it_process, current)) {
+                if (timr->it_signal == current->signal) {
                         spin_unlock(&idr_lock);
                         return timr;
                 }
@@ -831,8 +839,7 @@ retry_delete:
          * This keeps any tasks waiting on the spin lock from thinking
          * they got something (see the lock code above).
          */
-        put_task_struct(timer->it_process);
-        timer->it_process = NULL;
+        timer->it_signal = NULL;
 
         unlock_timer(timer, flags);
         release_posix_timer(timer, IT_ID_SET);
@@ -858,8 +865,7 @@ retry_delete:
          * This keeps any tasks waiting on the spin lock from thinking
          * they got something (see the lock code above).
          */
-        put_task_struct(timer->it_process);
-        timer->it_process = NULL;
+        timer->it_signal = NULL;
 
         unlock_timer(timer, flags);
         release_posix_timer(timer, IT_ID_SET);
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index c9d74083746f..f77d3819ef57 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -22,7 +22,6 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
-#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -257,7 +256,7 @@ static int create_image(int platform_mode)
 
 int hibernation_snapshot(int platform_mode)
 {
-        int error, ftrace_save;
+        int error;
 
         /* Free memory before shutting down devices. */
         error = swsusp_shrink_memory();
@@ -269,7 +268,6 @@ int hibernation_snapshot(int platform_mode)
                 goto Close;
 
         suspend_console();
-        ftrace_save = __ftrace_enabled_save();
         error = device_suspend(PMSG_FREEZE);
         if (error)
                 goto Recover_platform;
@@ -299,7 +297,6 @@ int hibernation_snapshot(int platform_mode)
  Resume_devices:
         device_resume(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
-        __ftrace_enabled_restore(ftrace_save);
         resume_console();
  Close:
         platform_end(platform_mode);
@@ -370,11 +367,10 @@ static int resume_target_kernel(void)
 
 int hibernation_restore(int platform_mode)
 {
-        int error, ftrace_save;
+        int error;
 
         pm_prepare_console();
         suspend_console();
-        ftrace_save = __ftrace_enabled_save();
         error = device_suspend(PMSG_QUIESCE);
         if (error)
                 goto Finish;
@@ -389,7 +385,6 @@ int hibernation_restore(int platform_mode)
         platform_restore_cleanup(platform_mode);
         device_resume(PMSG_RECOVER);
  Finish:
-        __ftrace_enabled_restore(ftrace_save);
         resume_console();
         pm_restore_console();
         return error;
@@ -402,7 +397,7 @@ int hibernation_restore(int platform_mode)
 
 int hibernation_platform_enter(void)
 {
-        int error, ftrace_save;
+        int error;
 
         if (!hibernation_ops)
                 return -ENOSYS;
@@ -417,7 +412,6 @@ int hibernation_platform_enter(void)
                 goto Close;
 
         suspend_console();
-        ftrace_save = __ftrace_enabled_save();
         error = device_suspend(PMSG_HIBERNATE);
         if (error) {
                 if (hibernation_ops->recover)
@@ -452,7 +446,6 @@ int hibernation_platform_enter(void)
         hibernation_ops->finish();
  Resume_devices:
         device_resume(PMSG_RESTORE);
-        __ftrace_enabled_restore(ftrace_save);
         resume_console();
  Close:
         hibernation_ops->end();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b8f7ce9473e8..613f16941b85 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -22,7 +22,6 @@
 #include <linux/freezer.h>
 #include <linux/vmstat.h>
 #include <linux/syscalls.h>
-#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -317,7 +316,7 @@ static int suspend_enter(suspend_state_t state)
  */
 int suspend_devices_and_enter(suspend_state_t state)
 {
-        int error, ftrace_save;
+        int error;
 
         if (!suspend_ops)
                 return -ENOSYS;
@@ -328,7 +327,6 @@ int suspend_devices_and_enter(suspend_state_t state)
                         goto Close;
         }
         suspend_console();
-        ftrace_save = __ftrace_enabled_save();
         suspend_test_start();
         error = device_suspend(PMSG_SUSPEND);
         if (error) {
@@ -360,7 +358,6 @@ int suspend_devices_and_enter(suspend_state_t state)
         suspend_test_start();
         device_resume(PMSG_RESUME);
         suspend_test_finish("resume devices");
-        __ftrace_enabled_restore(ftrace_save);
         resume_console();
  Close:
         if (suspend_ops->end)
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index b7713b53d07a..6da14358537c 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -633,7 +633,7 @@ void swsusp_close(fmode_t mode)
                 return;
         }
 
-        blkdev_put(resume_bdev, mode); /* move up */
+        blkdev_put(resume_bdev, mode);
 }
 
 static int swsusp_header_init(void)
diff --git a/kernel/printk.c b/kernel/printk.c
index f492f1583d77..e651ab05655f 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -662,7 +662,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
         if (recursion_bug) {
                 recursion_bug = 0;
                 strcpy(printk_buf, recursion_bug_msg);
-                printed_len = sizeof(recursion_bug_msg);
+                printed_len = strlen(recursion_bug_msg);
         }
         /* Emit the output into the temporary buffer */
         printed_len += vscnprintf(printk_buf + printed_len,
diff --git a/kernel/profile.c b/kernel/profile.c
index dc41827fbfee..60adefb59b5e 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -544,7 +544,7 @@ static const struct file_operations proc_profile_operations = {
 };
 
 #ifdef CONFIG_SMP
-static inline void profile_nop(void *unused)
+static void profile_nop(void *unused)
 {
 }
 
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 4c8bcd7dd8e0..29dc700e198c 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -25,6 +25,17 @@
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
 
+
+/*
+ * Initialize a new task whose father had been ptraced.
+ *
+ * Called from copy_process().
+ */
+void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
+{
+        arch_ptrace_fork(child, clone_flags);
+}
+
 /*
  * ptrace a task: make the debugger its new parent and
  * move it to the ptrace list.
@@ -72,6 +83,7 @@ void __ptrace_unlink(struct task_struct *child)
         child->parent = child->real_parent;
         list_del_init(&child->ptrace_entry);
 
+        arch_ptrace_untrace(child);
         if (task_is_traced(child))
                 ptrace_untrace(child);
 }
@@ -115,6 +127,8 @@ int ptrace_check_attach(struct task_struct *child, int kill)
 
 int __ptrace_may_access(struct task_struct *task, unsigned int mode)
 {
+        const struct cred *cred = current_cred(), *tcred;
+
         /* May we inspect the given task?
          * This check is used both for attaching with ptrace
          * and for allowing access to sensitive information in /proc.
@@ -127,13 +141,19 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
         /* Don't let security modules deny introspection */
         if (task == current)
                 return 0;
-        if (((current->uid != task->euid) ||
-             (current->uid != task->suid) ||
-             (current->uid != task->uid) ||
-             (current->gid != task->egid) ||
-             (current->gid != task->sgid) ||
-             (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
+        rcu_read_lock();
+        tcred = __task_cred(task);
+        if ((cred->uid != tcred->euid ||
+             cred->uid != tcred->suid ||
+             cred->uid != tcred->uid  ||
+             cred->gid != tcred->egid ||
+             cred->gid != tcred->sgid ||
+             cred->gid != tcred->gid) &&
+            !capable(CAP_SYS_PTRACE)) {
+                rcu_read_unlock();
                 return -EPERM;
+        }
+        rcu_read_unlock();
         smp_rmb();
         if (task->mm)
                 dumpable = get_dumpable(task->mm);
@@ -163,6 +183,14 @@ int ptrace_attach(struct task_struct *task)
         if (same_thread_group(task, current))
                 goto out;
 
+        /* Protect exec's credential calculations against our interference;
+         * SUID, SGID and LSM creds get determined differently under ptrace.
+         */
+        retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+        if (retval  < 0)
+                goto out;
+
+        retval = -EPERM;
 repeat:
         /*
          * Nasty, nasty.
@@ -202,6 +230,7 @@ repeat:
 bad:
         write_unlock_irqrestore(&tasklist_lock, flags);
         task_unlock(task);
+        mutex_unlock(&current->cred_exec_mutex);
 out:
         return retval;
 }
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index 37f72e551542..e503a002f330 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -191,7 +191,7 @@ static void print_other_cpu_stall(struct rcu_ctrlblk *rcp)
 
         /* OK, time to rat on our buddy... */
 
-        printk(KERN_ERR "RCU detected CPU stalls:");
+        printk(KERN_ERR "INFO: RCU detected CPU stalls:");
         for_each_possible_cpu(cpu) {
                 if (cpu_isset(cpu, rcp->cpumask))
                         printk(" %d", cpu);
@@ -204,7 +204,7 @@ static void print_cpu_stall(struct rcu_ctrlblk *rcp)
 {
         unsigned long flags;
 
-        printk(KERN_ERR "RCU detected CPU %d stall (t=%lu/%lu jiffies)\n",
+        printk(KERN_ERR "INFO: RCU detected CPU %d stall (t=%lu/%lu jiffies)\n",
                         smp_processor_id(), jiffies,
                         jiffies - rcp->gp_start);
         dump_stack();
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index 59236e8b9daa..04982659875a 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -551,6 +551,16 @@ void rcu_irq_exit(void)
         }
 }
 
+void rcu_nmi_enter(void)
+{
+        rcu_irq_enter();
+}
+
+void rcu_nmi_exit(void)
+{
+        rcu_irq_exit();
+}
+
 static void dyntick_save_progress_counter(int cpu)
 {
         struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
diff --git a/kernel/rcupreempt_trace.c b/kernel/rcupreempt_trace.c
index 35c2d3360ecf..7c2665cac172 100644
--- a/kernel/rcupreempt_trace.c
+++ b/kernel/rcupreempt_trace.c
@@ -149,12 +149,12 @@ static void rcupreempt_trace_sum(struct rcupreempt_trace *sp)
                 sp->done_length += cp->done_length;
                 sp->done_add += cp->done_add;
                 sp->done_remove += cp->done_remove;
-                atomic_set(&sp->done_invoked, atomic_read(&cp->done_invoked));
+                atomic_add(atomic_read(&cp->done_invoked), &sp->done_invoked);
                 sp->rcu_check_callbacks += cp->rcu_check_callbacks;
-                atomic_set(&sp->rcu_try_flip_1,
-                           atomic_read(&cp->rcu_try_flip_1));
-                atomic_set(&sp->rcu_try_flip_e1,
-                           atomic_read(&cp->rcu_try_flip_e1));
+                atomic_add(atomic_read(&cp->rcu_try_flip_1),
+                           &sp->rcu_try_flip_1);
+                atomic_add(atomic_read(&cp->rcu_try_flip_e1),
+                           &sp->rcu_try_flip_e1);
                 sp->rcu_try_flip_i1 += cp->rcu_try_flip_i1;
                 sp->rcu_try_flip_ie1 += cp->rcu_try_flip_ie1;
                 sp->rcu_try_flip_g1 += cp->rcu_try_flip_g1;
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 85cb90588a55..b31065522104 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -39,6 +39,7 @@
 #include <linux/moduleparam.h>
 #include <linux/percpu.h>
 #include <linux/notifier.h>
+#include <linux/reboot.h>
 #include <linux/freezer.h>
 #include <linux/cpu.h>
 #include <linux/delay.h>
@@ -108,7 +109,6 @@ struct rcu_torture {
         int rtort_mbtest;
 };
 
-static int fullstop = 0;        /* stop generating callbacks at test end. */
 static LIST_HEAD(rcu_torture_freelist);
 static struct rcu_torture *rcu_torture_current = NULL;
 static long rcu_torture_current_version = 0;
@@ -136,6 +136,30 @@ static int stutter_pause_test = 0;
 #endif
 int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT;
 
+#define FULLSTOP_SIGNALED 1     /* Bail due to signal. */
+#define FULLSTOP_CLEANUP  2     /* Orderly shutdown. */
+static int fullstop;            /* stop generating callbacks at test end. */
+DEFINE_MUTEX(fullstop_mutex);   /* protect fullstop transitions and */
+                                /*  spawning of kthreads. */
+
+/*
+ * Detect and respond to a signal-based shutdown.
+ */
+static int
+rcutorture_shutdown_notify(struct notifier_block *unused1,
+                           unsigned long unused2, void *unused3)
+{
+        if (fullstop)
+                return NOTIFY_DONE;
+        if (signal_pending(current)) {
+                mutex_lock(&fullstop_mutex);
+                if (!ACCESS_ONCE(fullstop))
+                        fullstop = FULLSTOP_SIGNALED;
+                mutex_unlock(&fullstop_mutex);
+        }
+        return NOTIFY_DONE;
+}
+
 /*
  * Allocate an element from the rcu_tortures pool.
  */
@@ -199,11 +223,12 @@ rcu_random(struct rcu_random_state *rrsp)
 static void
 rcu_stutter_wait(void)
 {
-        while (stutter_pause_test || !rcutorture_runnable)
+        while ((stutter_pause_test || !rcutorture_runnable) && !fullstop) {
                 if (rcutorture_runnable)
                         schedule_timeout_interruptible(1);
                 else
                         schedule_timeout_interruptible(round_jiffies_relative(HZ));
+        }
 }
 
 /*
@@ -599,7 +624,7 @@ rcu_torture_writer(void *arg)
                 rcu_stutter_wait();
         } while (!kthread_should_stop() && !fullstop);
         VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping");
-        while (!kthread_should_stop())
+        while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
                 schedule_timeout_uninterruptible(1);
         return 0;
 }
@@ -624,7 +649,7 @@ rcu_torture_fakewriter(void *arg)
         } while (!kthread_should_stop() && !fullstop);
 
         VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping");
-        while (!kthread_should_stop())
+        while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
                 schedule_timeout_uninterruptible(1);
         return 0;
 }
@@ -734,7 +759,7 @@ rcu_torture_reader(void *arg)
         VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping");
         if (irqreader && cur_ops->irqcapable)
                 del_timer_sync(&t);
-        while (!kthread_should_stop())
+        while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
                 schedule_timeout_uninterruptible(1);
         return 0;
 }
@@ -831,7 +856,7 @@ rcu_torture_stats(void *arg)
         do {
                 schedule_timeout_interruptible(stat_interval * HZ);
                 rcu_torture_stats_print();
-        } while (!kthread_should_stop());
+        } while (!kthread_should_stop() && !fullstop);
         VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping");
         return 0;
 }
@@ -899,7 +924,7 @@ rcu_torture_shuffle(void *arg)
         do {
                 schedule_timeout_interruptible(shuffle_interval * HZ);
                 rcu_torture_shuffle_tasks();
-        } while (!kthread_should_stop());
+        } while (!kthread_should_stop() && !fullstop);
         VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping");
         return 0;
 }
@@ -914,10 +939,10 @@ rcu_torture_stutter(void *arg)
         do {
                 schedule_timeout_interruptible(stutter * HZ);
                 stutter_pause_test = 1;
-                if (!kthread_should_stop())
+                if (!kthread_should_stop() && !fullstop)
                         schedule_timeout_interruptible(stutter * HZ);
                 stutter_pause_test = 0;
-        } while (!kthread_should_stop());
+        } while (!kthread_should_stop() && !fullstop);
         VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping");
         return 0;
 }
@@ -934,12 +959,27 @@ rcu_torture_print_module_parms(char *tag)
                 stutter, irqreader);
 }
 
+static struct notifier_block rcutorture_nb = {
+        .notifier_call = rcutorture_shutdown_notify,
+};
+
 static void
 rcu_torture_cleanup(void)
 {
         int i;
 
-        fullstop = 1;
+        mutex_lock(&fullstop_mutex);
+        if (!fullstop) {
+                /* If being signaled, let it happen, then exit. */
+                mutex_unlock(&fullstop_mutex);
+                schedule_timeout_interruptible(10 * HZ);
+                if (cur_ops->cb_barrier != NULL)
+                        cur_ops->cb_barrier();
+                return;
+        }
+        fullstop = FULLSTOP_CLEANUP;
+        mutex_unlock(&fullstop_mutex);
+        unregister_reboot_notifier(&rcutorture_nb);
         if (stutter_task) {
                 VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task");
                 kthread_stop(stutter_task);
@@ -1015,6 +1055,8 @@ rcu_torture_init(void)
                 { &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops,
                   &srcu_ops, &sched_ops, &sched_ops_sync, };
 
+        mutex_lock(&fullstop_mutex);
+
         /* Process args and tell the world that the torturer is on the job. */
         for (i = 0; i < ARRAY_SIZE(torture_ops); i++) {
                 cur_ops = torture_ops[i];
@@ -1024,6 +1066,7 @@ rcu_torture_init(void)
         if (i == ARRAY_SIZE(torture_ops)) {
                 printk(KERN_ALERT "rcutorture: invalid torture type: \"%s\"\n",
                        torture_type);
+                mutex_unlock(&fullstop_mutex);
                 return (-EINVAL);
         }
         if (cur_ops->init)
@@ -1146,9 +1189,12 @@ rcu_torture_init(void)
                         goto unwind;
                 }
         }
+        register_reboot_notifier(&rcutorture_nb);
+        mutex_unlock(&fullstop_mutex);
         return 0;
 
 unwind:
+        mutex_unlock(&fullstop_mutex);
         rcu_torture_cleanup();
         return firsterr;
 }
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
new file mode 100644
index 000000000000..a342b032112c
--- /dev/null
+++ b/kernel/rcutree.c
@@ -0,0 +1,1535 @@
+/*
+ * Read-Copy Update mechanism for mutual exclusion
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2008
+ *
+ * Authors: Dipankar Sarma <dipankar@in.ibm.com>
+ *          Manfred Spraul <manfred@colorfullife.com>
+ *          Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical version
+ *
+ * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
+ * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ *      Documentation/RCU
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/rcupdate.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/moduleparam.h>
+#include <linux/percpu.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/mutex.h>
+#include <linux/time.h>
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key rcu_lock_key;
+struct lockdep_map rcu_lock_map =
+        STATIC_LOCKDEP_MAP_INIT("rcu_read_lock", &rcu_lock_key);
+EXPORT_SYMBOL_GPL(rcu_lock_map);
+#endif
+
+/* Data structures. */
+
+#define RCU_STATE_INITIALIZER(name) { \
+        .level = { &name.node[0] }, \
+        .levelcnt = { \
+                NUM_RCU_LVL_0,  /* root of hierarchy. */ \
+                NUM_RCU_LVL_1, \
+                NUM_RCU_LVL_2, \
+                NUM_RCU_LVL_3, /* == MAX_RCU_LVLS */ \
+        }, \
+        .signaled = RCU_SIGNAL_INIT, \
+        .gpnum = -300, \
+        .completed = -300, \
+        .onofflock = __SPIN_LOCK_UNLOCKED(&name.onofflock), \
+        .fqslock = __SPIN_LOCK_UNLOCKED(&name.fqslock), \
+        .n_force_qs = 0, \
+        .n_force_qs_ngp = 0, \
+}
+
+struct rcu_state rcu_state = RCU_STATE_INITIALIZER(rcu_state);
+DEFINE_PER_CPU(struct rcu_data, rcu_data);
+
+struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state);
+DEFINE_PER_CPU(struct rcu_data, rcu_bh_data);
+
+#ifdef CONFIG_NO_HZ
+DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks);
+#endif /* #ifdef CONFIG_NO_HZ */
+
+static int blimit = 10;         /* Maximum callbacks per softirq. */
+static int qhimark = 10000;     /* If this many pending, ignore blimit. */
+static int qlowmark = 100;      /* Once only this many pending, use blimit. */
+
+static void force_quiescent_state(struct rcu_state *rsp, int relaxed);
+
+/*
+ * Return the number of RCU batches processed thus far for debug & stats.
+ */
+long rcu_batches_completed(void)
+{
+        return rcu_state.completed;
+}
+EXPORT_SYMBOL_GPL(rcu_batches_completed);
+
+/*
+ * Return the number of RCU BH batches processed thus far for debug & stats.
+ */
+long rcu_batches_completed_bh(void)
+{
+        return rcu_bh_state.completed;
+}
+EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
+
+/*
+ * Does the CPU have callbacks ready to be invoked?
+ */
+static int
+cpu_has_callbacks_ready_to_invoke(struct rcu_data *rdp)
+{
+        return &rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL];
+}
+
+/*
+ * Does the current CPU require a yet-as-unscheduled grace period?
+ */
+static int
+cpu_needs_another_gp(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        /* ACCESS_ONCE() because we are accessing outside of lock. */
+        return *rdp->nxttail[RCU_DONE_TAIL] &&
+               ACCESS_ONCE(rsp->completed) == ACCESS_ONCE(rsp->gpnum);
+}
+
+/*
+ * Return the root node of the specified rcu_state structure.
+ */
+static struct rcu_node *rcu_get_root(struct rcu_state *rsp)
+{
+        return &rsp->node[0];
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * If the specified CPU is offline, tell the caller that it is in
+ * a quiescent state.  Otherwise, whack it with a reschedule IPI.
+ * Grace periods can end up waiting on an offline CPU when that
+ * CPU is in the process of coming online -- it will be added to the
+ * rcu_node bitmasks before it actually makes it online.  The same thing
+ * can happen while a CPU is in the process of coming online.  Because this
+ * race is quite rare, we check for it after detecting that the grace
+ * period has been delayed rather than checking each and every CPU
+ * each and every time we start a new grace period.
+ */
+static int rcu_implicit_offline_qs(struct rcu_data *rdp)
+{
+        /*
+         * If the CPU is offline, it is in a quiescent state.  We can
+         * trust its state not to change because interrupts are disabled.
+         */
+        if (cpu_is_offline(rdp->cpu)) {
+                rdp->offline_fqs++;
+                return 1;
+        }
+
+        /* The CPU is online, so send it a reschedule IPI. */
+        if (rdp->cpu != smp_processor_id())
+                smp_send_reschedule(rdp->cpu);
+        else
+                set_need_resched();
+        rdp->resched_ipi++;
+        return 0;
+}
+
+#endif /* #ifdef CONFIG_SMP */
+
+#ifdef CONFIG_NO_HZ
+static DEFINE_RATELIMIT_STATE(rcu_rs, 10 * HZ, 5);
+
+/**
+ * rcu_enter_nohz - inform RCU that current CPU is entering nohz
+ *
+ * Enter nohz mode, in other words, -leave- the mode in which RCU
+ * read-side critical sections can occur.  (Though RCU read-side
+ * critical sections can occur in irq handlers in nohz mode, a possibility
+ * handled by rcu_irq_enter() and rcu_irq_exit()).
+ */
+void rcu_enter_nohz(void)
+{
+        unsigned long flags;
+        struct rcu_dynticks *rdtp;
+
+        smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+        local_irq_save(flags);
+        rdtp = &__get_cpu_var(rcu_dynticks);
+        rdtp->dynticks++;
+        rdtp->dynticks_nesting--;
+        WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
+        local_irq_restore(flags);
+}
+
+/*
+ * rcu_exit_nohz - inform RCU that current CPU is leaving nohz
+ *
+ * Exit nohz mode, in other words, -enter- the mode in which RCU
+ * read-side critical sections normally occur.
+ */
+void rcu_exit_nohz(void)
+{
+        unsigned long flags;
+        struct rcu_dynticks *rdtp;
+
+        local_irq_save(flags);
+        rdtp = &__get_cpu_var(rcu_dynticks);
+        rdtp->dynticks++;
+        rdtp->dynticks_nesting++;
+        WARN_ON_RATELIMIT(!(rdtp->dynticks & 0x1), &rcu_rs);
+        local_irq_restore(flags);
+        smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+}
+
+/**
+ * rcu_nmi_enter - inform RCU of entry to NMI context
+ *
+ * If the CPU was idle with dynamic ticks active, and there is no
+ * irq handler running, this updates rdtp->dynticks_nmi to let the
+ * RCU grace-period handling know that the CPU is active.
+ */
+void rcu_nmi_enter(void)
+{
+        struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+        if (rdtp->dynticks & 0x1)
+                return;
+        rdtp->dynticks_nmi++;
+        WARN_ON_RATELIMIT(!(rdtp->dynticks_nmi & 0x1), &rcu_rs);
+        smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+}
+
+/**
+ * rcu_nmi_exit - inform RCU of exit from NMI context
+ *
+ * If the CPU was idle with dynamic ticks active, and there is no
+ * irq handler running, this updates rdtp->dynticks_nmi to let the
+ * RCU grace-period handling know that the CPU is no longer active.
+ */
+void rcu_nmi_exit(void)
+{
+        struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+        if (rdtp->dynticks & 0x1)
+                return;
+        smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+        rdtp->dynticks_nmi++;
+        WARN_ON_RATELIMIT(rdtp->dynticks_nmi & 0x1, &rcu_rs);
+}
+
+/**
+ * rcu_irq_enter - inform RCU of entry to hard irq context
+ *
+ * If the CPU was idle with dynamic ticks active, this updates the
+ * rdtp->dynticks to let the RCU handling know that the CPU is active.
+ */
+void rcu_irq_enter(void)
+{
+        struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+        if (rdtp->dynticks_nesting++)
+                return;
+        rdtp->dynticks++;
+        WARN_ON_RATELIMIT(!(rdtp->dynticks & 0x1), &rcu_rs);
+        smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+}
+
+/**
+ * rcu_irq_exit - inform RCU of exit from hard irq context
+ *
+ * If the CPU was idle with dynamic ticks active, update the rdp->dynticks
+ * to put let the RCU handling be aware that the CPU is going back to idle
+ * with no ticks.
+ */
+void rcu_irq_exit(void)
+{
+        struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+        if (--rdtp->dynticks_nesting)
+                return;
+        smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+        rdtp->dynticks++;
+        WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
+
+        /* If the interrupt queued a callback, get out of dyntick mode. */
+        if (__get_cpu_var(rcu_data).nxtlist ||
+            __get_cpu_var(rcu_bh_data).nxtlist)
+                set_need_resched();
+}
+
+/*
+ * Record the specified "completed" value, which is later used to validate
+ * dynticks counter manipulations.  Specify "rsp->completed - 1" to
+ * unconditionally invalidate any future dynticks manipulations (which is
+ * useful at the beginning of a grace period).
+ */
+static void dyntick_record_completed(struct rcu_state *rsp, long comp)
+{
+        rsp->dynticks_completed = comp;
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * Recall the previously recorded value of the completion for dynticks.
+ */
+static long dyntick_recall_completed(struct rcu_state *rsp)
+{
+        return rsp->dynticks_completed;
+}
+
+/*
+ * Snapshot the specified CPU's dynticks counter so that we can later
+ * credit them with an implicit quiescent state.  Return 1 if this CPU
+ * is already in a quiescent state courtesy of dynticks idle mode.
+ */
+static int dyntick_save_progress_counter(struct rcu_data *rdp)
+{
+        int ret;
+        int snap;
+        int snap_nmi;
+
+        snap = rdp->dynticks->dynticks;
+        snap_nmi = rdp->dynticks->dynticks_nmi;
+        smp_mb();       /* Order sampling of snap with end of grace period. */
+        rdp->dynticks_snap = snap;
+        rdp->dynticks_nmi_snap = snap_nmi;
+        ret = ((snap & 0x1) == 0) && ((snap_nmi & 0x1) == 0);
+        if (ret)
+                rdp->dynticks_fqs++;
+        return ret;
+}
+
+/*
+ * Return true if the specified CPU has passed through a quiescent
+ * state by virtue of being in or having passed through an dynticks
+ * idle state since the last call to dyntick_save_progress_counter()
+ * for this same CPU.
+ */
+static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
+{
+        long curr;
+        long curr_nmi;
+        long snap;
+        long snap_nmi;
+
+        curr = rdp->dynticks->dynticks;
+        snap = rdp->dynticks_snap;
+        curr_nmi = rdp->dynticks->dynticks_nmi;
+        snap_nmi = rdp->dynticks_nmi_snap;
+        smp_mb(); /* force ordering with cpu entering/leaving dynticks. */
+
+        /*
+         * If the CPU passed through or entered a dynticks idle phase with
+         * no active irq/NMI handlers, then we can safely pretend that the CPU
+         * already acknowledged the request to pass through a quiescent
+         * state.  Either way, that CPU cannot possibly be in an RCU
+         * read-side critical section that started before the beginning
+         * of the current RCU grace period.
+         */
+        if ((curr != snap || (curr & 0x1) == 0) &&
+            (curr_nmi != snap_nmi || (curr_nmi & 0x1) == 0)) {
+                rdp->dynticks_fqs++;
+                return 1;
+        }
+
+        /* Go check for the CPU being offline. */
+        return rcu_implicit_offline_qs(rdp);
+}
+
+#endif /* #ifdef CONFIG_SMP */
+
+#else /* #ifdef CONFIG_NO_HZ */
+
+static void dyntick_record_completed(struct rcu_state *rsp, long comp)
+{
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * If there are no dynticks, then the only way that a CPU can passively
+ * be in a quiescent state is to be offline.  Unlike dynticks idle, which
+ * is a point in time during the prior (already finished) grace period,
+ * an offline CPU is always in a quiescent state, and thus can be
+ * unconditionally applied.  So just return the current value of completed.
+ */
+static long dyntick_recall_completed(struct rcu_state *rsp)
+{
+        return rsp->completed;
+}
+
+static int dyntick_save_progress_counter(struct rcu_data *rdp)
+{
+        return 0;
+}
+
+static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
+{
+        return rcu_implicit_offline_qs(rdp);
+}
+
+#endif /* #ifdef CONFIG_SMP */
+
+#endif /* #else #ifdef CONFIG_NO_HZ */
+
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
+
+static void record_gp_stall_check_time(struct rcu_state *rsp)
+{
+        rsp->gp_start = jiffies;
+        rsp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_CHECK;
+}
+
+static void print_other_cpu_stall(struct rcu_state *rsp)
+{
+        int cpu;
+        long delta;
+        unsigned long flags;
+        struct rcu_node *rnp = rcu_get_root(rsp);
+        struct rcu_node *rnp_cur = rsp->level[NUM_RCU_LVLS - 1];
+        struct rcu_node *rnp_end = &rsp->node[NUM_RCU_NODES];
+
+        /* Only let one CPU complain about others per time interval. */
+
+        spin_lock_irqsave(&rnp->lock, flags);
+        delta = jiffies - rsp->jiffies_stall;
+        if (delta < RCU_STALL_RAT_DELAY || rsp->gpnum == rsp->completed) {
+                spin_unlock_irqrestore(&rnp->lock, flags);
+                return;
+        }
+        rsp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
+        spin_unlock_irqrestore(&rnp->lock, flags);
+
+        /* OK, time to rat on our buddy... */
+
+        printk(KERN_ERR "INFO: RCU detected CPU stalls:");
+        for (; rnp_cur < rnp_end; rnp_cur++) {
+                if (rnp_cur->qsmask == 0)
+                        continue;
+                for (cpu = 0; cpu <= rnp_cur->grphi - rnp_cur->grplo; cpu++)
+                        if (rnp_cur->qsmask & (1UL << cpu))
+                                printk(" %d", rnp_cur->grplo + cpu);
+        }
+        printk(" (detected by %d, t=%ld jiffies)\n",
+               smp_processor_id(), (long)(jiffies - rsp->gp_start));
+        force_quiescent_state(rsp, 0);  /* Kick them all. */
+}
+
+static void print_cpu_stall(struct rcu_state *rsp)
+{
+        unsigned long flags;
+        struct rcu_node *rnp = rcu_get_root(rsp);
+
+        printk(KERN_ERR "INFO: RCU detected CPU %d stall (t=%lu jiffies)\n",
+                        smp_processor_id(), jiffies - rsp->gp_start);
+        dump_stack();
+        spin_lock_irqsave(&rnp->lock, flags);
+        if ((long)(jiffies - rsp->jiffies_stall) >= 0)
+                rsp->jiffies_stall =
+                        jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
+        spin_unlock_irqrestore(&rnp->lock, flags);
+        set_need_resched();  /* kick ourselves to get things going. */
+}
+
+static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        long delta;
+        struct rcu_node *rnp;
+
+        delta = jiffies - rsp->jiffies_stall;
+        rnp = rdp->mynode;
+        if ((rnp->qsmask & rdp->grpmask) && delta >= 0) {
+
+                /* We haven't checked in, so go dump stack. */
+                print_cpu_stall(rsp);
+
+        } else if (rsp->gpnum != rsp->completed &&
+                   delta >= RCU_STALL_RAT_DELAY) {
+
+                /* They had two time units to dump stack, so complain. */
+                print_other_cpu_stall(rsp);
+        }
+}
+
+#else /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+
+static void record_gp_stall_check_time(struct rcu_state *rsp)
+{
+}
+
+static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+}
+
+#endif /* #else #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+
+/*
+ * Update CPU-local rcu_data state to record the newly noticed grace period.
+ * This is used both when we started the grace period and when we notice
+ * that someone else started the grace period.
+ */
+static void note_new_gpnum(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        rdp->qs_pending = 1;
+        rdp->passed_quiesc = 0;
+        rdp->gpnum = rsp->gpnum;
+        rdp->n_rcu_pending_force_qs = rdp->n_rcu_pending +
+                                      RCU_JIFFIES_TILL_FORCE_QS;
+}
+
+/*
+ * Did someone else start a new RCU grace period start since we last
+ * checked?  Update local state appropriately if so.  Must be called
+ * on the CPU corresponding to rdp.
+ */
+static int
+check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        local_irq_save(flags);
+        if (rdp->gpnum != rsp->gpnum) {
+                note_new_gpnum(rsp, rdp);
+                ret = 1;
+        }
+        local_irq_restore(flags);
+        return ret;
+}
+
+/*
+ * Start a new RCU grace period if warranted, re-initializing the hierarchy
+ * in preparation for detecting the next grace period.  The caller must hold
+ * the root node's ->lock, which is released before return.  Hard irqs must
+ * be disabled.
+ */
+static void
+rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
+        __releases(rcu_get_root(rsp)->lock)
+{
+        struct rcu_data *rdp = rsp->rda[smp_processor_id()];
+        struct rcu_node *rnp = rcu_get_root(rsp);
+        struct rcu_node *rnp_cur;
+        struct rcu_node *rnp_end;
+
+        if (!cpu_needs_another_gp(rsp, rdp)) {
+                spin_unlock_irqrestore(&rnp->lock, flags);
+                return;
+        }
+
+        /* Advance to a new grace period and initialize state. */
+        rsp->gpnum++;
+        rsp->signaled = RCU_GP_INIT; /* Hold off force_quiescent_state. */
+        rsp->jiffies_force_qs = jiffies + RCU_JIFFIES_TILL_FORCE_QS;
+        rdp->n_rcu_pending_force_qs = rdp->n_rcu_pending +
+                                      RCU_JIFFIES_TILL_FORCE_QS;
+        record_gp_stall_check_time(rsp);
+        dyntick_record_completed(rsp, rsp->completed - 1);
+        note_new_gpnum(rsp, rdp);
+
+        /*
+         * Because we are first, we know that all our callbacks will
+         * be covered by this upcoming grace period, even the ones
+         * that were registered arbitrarily recently.
+         */
+        rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+        rdp->nxttail[RCU_WAIT_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+
+        /* Special-case the common single-level case. */
+        if (NUM_RCU_NODES == 1) {
+                rnp->qsmask = rnp->qsmaskinit;
+                spin_unlock_irqrestore(&rnp->lock, flags);
+                return;
+        }
+
+        spin_unlock(&rnp->lock);  /* leave irqs disabled. */
+
+
+        /* Exclude any concurrent CPU-hotplug operations. */
+        spin_lock(&rsp->onofflock);  /* irqs already disabled. */
+
+        /*
+         * Set the quiescent-state-needed bits in all the non-leaf RCU
+         * nodes for all currently online CPUs.  This operation relies
+         * on the layout of the hierarchy within the rsp->node[] array.
+         * Note that other CPUs will access only the leaves of the
+         * hierarchy, which still indicate that no grace period is in
+         * progress.  In addition, we have excluded CPU-hotplug operations.
+         *
+         * We therefore do not need to hold any locks.  Any required
+         * memory barriers will be supplied by the locks guarding the
+         * leaf rcu_nodes in the hierarchy.
+         */
+
+        rnp_end = rsp->level[NUM_RCU_LVLS - 1];
+        for (rnp_cur = &rsp->node[0]; rnp_cur < rnp_end; rnp_cur++)
+                rnp_cur->qsmask = rnp_cur->qsmaskinit;
+
+        /*
+         * Now set up the leaf nodes.  Here we must be careful.  First,
+         * we need to hold the lock in order to exclude other CPUs, which
+         * might be contending for the leaf nodes' locks.  Second, as
+         * soon as we initialize a given leaf node, its CPUs might run
+         * up the rest of the hierarchy.  We must therefore acquire locks
+         * for each node that we touch during this stage.  (But we still
+         * are excluding CPU-hotplug operations.)
+         *
+         * Note that the grace period cannot complete until we finish
+         * the initialization process, as there will be at least one
+         * qsmask bit set in the root node until that time, namely the
+         * one corresponding to this CPU.
+         */
+        rnp_end = &rsp->node[NUM_RCU_NODES];
+        rnp_cur = rsp->level[NUM_RCU_LVLS - 1];
+        for (; rnp_cur < rnp_end; rnp_cur++) {
+                spin_lock(&rnp_cur->lock);      /* irqs already disabled. */
+                rnp_cur->qsmask = rnp_cur->qsmaskinit;
+                spin_unlock(&rnp_cur->lock);    /* irqs already disabled. */
+        }
+
+        rsp->signaled = RCU_SIGNAL_INIT; /* force_quiescent_state now OK. */
+        spin_unlock_irqrestore(&rsp->onofflock, flags);
+}
+
+/*
+ * Advance this CPU's callbacks, but only if the current grace period
+ * has ended.  This may be called only from the CPU to whom the rdp
+ * belongs.
+ */
+static void
+rcu_process_gp_end(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        long completed_snap;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        completed_snap = ACCESS_ONCE(rsp->completed);  /* outside of lock. */
+
+        /* Did another grace period end? */
+        if (rdp->completed != completed_snap) {
+
+                /* Advance callbacks.  No harm if list empty. */
+                rdp->nxttail[RCU_DONE_TAIL] = rdp->nxttail[RCU_WAIT_TAIL];
+                rdp->nxttail[RCU_WAIT_TAIL] = rdp->nxttail[RCU_NEXT_READY_TAIL];
+                rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+
+                /* Remember that we saw this grace-period completion. */
+                rdp->completed = completed_snap;
+        }
+        local_irq_restore(flags);
+}
+
+/*
+ * Similar to cpu_quiet(), for which it is a helper function.  Allows
+ * a group of CPUs to be quieted at one go, though all the CPUs in the
+ * group must be represented by the same leaf rcu_node structure.
+ * That structure's lock must be held upon entry, and it is released
+ * before return.
+ */
+static void
+cpu_quiet_msk(unsigned long mask, struct rcu_state *rsp, struct rcu_node *rnp,
+              unsigned long flags)
+        __releases(rnp->lock)
+{
+        /* Walk up the rcu_node hierarchy. */
+        for (;;) {
+                if (!(rnp->qsmask & mask)) {
+
+                        /* Our bit has already been cleared, so done. */
+                        spin_unlock_irqrestore(&rnp->lock, flags);
+                        return;
+                }
+                rnp->qsmask &= ~mask;
+                if (rnp->qsmask != 0) {
+
+                        /* Other bits still set at this level, so done. */
+                        spin_unlock_irqrestore(&rnp->lock, flags);
+                        return;
+                }
+                mask = rnp->grpmask;
+                if (rnp->parent == NULL) {
+
+                        /* No more levels.  Exit loop holding root lock. */
+
+                        break;
+                }
+                spin_unlock_irqrestore(&rnp->lock, flags);
+                rnp = rnp->parent;
+                spin_lock_irqsave(&rnp->lock, flags);
+        }
+
+        /*
+         * Get here if we are the last CPU to pass through a quiescent
+         * state for this grace period.  Clean up and let rcu_start_gp()
+         * start up the next grace period if one is needed.  Note that
+         * we still hold rnp->lock, as required by rcu_start_gp(), which
+         * will release it.
+         */
+        rsp->completed = rsp->gpnum;
+        rcu_process_gp_end(rsp, rsp->rda[smp_processor_id()]);
+        rcu_start_gp(rsp, flags);  /* releases rnp->lock. */
+}
+
+/*
+ * Record a quiescent state for the specified CPU, which must either be
+ * the current CPU or an offline CPU.  The lastcomp argument is used to
+ * make sure we are still in the grace period of interest.  We don't want
+ * to end the current grace period based on quiescent states detected in
+ * an earlier grace period!
+ */
+static void
+cpu_quiet(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long lastcomp)
+{
+        unsigned long flags;
+        unsigned long mask;
+        struct rcu_node *rnp;
+
+        rnp = rdp->mynode;
+        spin_lock_irqsave(&rnp->lock, flags);
+        if (lastcomp != ACCESS_ONCE(rsp->completed)) {
+
+                /*
+                 * Someone beat us to it for this grace period, so leave.
+                 * The race with GP start is resolved by the fact that we
+                 * hold the leaf rcu_node lock, so that the per-CPU bits
+                 * cannot yet be initialized -- so we would simply find our
+                 * CPU's bit already cleared in cpu_quiet_msk() if this race
+                 * occurred.
+                 */
+                rdp->passed_quiesc = 0; /* try again later! */
+                spin_unlock_irqrestore(&rnp->lock, flags);
+                return;
+        }
+        mask = rdp->grpmask;
+        if ((rnp->qsmask & mask) == 0) {
+                spin_unlock_irqrestore(&rnp->lock, flags);
+        } else {
+                rdp->qs_pending = 0;
+
+                /*
+                 * This GP can't end until cpu checks in, so all of our
+                 * callbacks can be processed during the next GP.
+                 */
+                rdp = rsp->rda[smp_processor_id()];
+                rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+
+                cpu_quiet_msk(mask, rsp, rnp, flags); /* releases rnp->lock */
+        }
+}
+
+/*
+ * Check to see if there is a new grace period of which this CPU
+ * is not yet aware, and if so, set up local rcu_data state for it.
+ * Otherwise, see if this CPU has just passed through its first
+ * quiescent state for this grace period, and record that fact if so.
+ */
+static void
+rcu_check_quiescent_state(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        /* If there is now a new grace period, record and return. */
+        if (check_for_new_grace_period(rsp, rdp))
+                return;
+
+        /*
+         * Does this CPU still need to do its part for current grace period?
+         * If no, return and let the other CPUs do their part as well.
+         */
+        if (!rdp->qs_pending)
+                return;
+
+        /*
+         * Was there a quiescent state since the beginning of the grace
+         * period? If no, then exit and wait for the next call.
+         */
+        if (!rdp->passed_quiesc)
+                return;
+
+        /* Tell RCU we are done (but cpu_quiet() will be the judge of that). */
+        cpu_quiet(rdp->cpu, rsp, rdp, rdp->passed_quiesc_completed);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+/*
+ * Remove the outgoing CPU from the bitmasks in the rcu_node hierarchy
+ * and move all callbacks from the outgoing CPU to the current one.
+ */
+static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
+{
+        int i;
+        unsigned long flags;
+        long lastcomp;
+        unsigned long mask;
+        struct rcu_data *rdp = rsp->rda[cpu];
+        struct rcu_data *rdp_me;
+        struct rcu_node *rnp;
+
+        /* Exclude any attempts to start a new grace period. */
+        spin_lock_irqsave(&rsp->onofflock, flags);
+
+        /* Remove the outgoing CPU from the masks in the rcu_node hierarchy. */
+        rnp = rdp->mynode;
+        mask = rdp->grpmask;    /* rnp->grplo is constant. */
+        do {
+                spin_lock(&rnp->lock);          /* irqs already disabled. */
+                rnp->qsmaskinit &= ~mask;
+                if (rnp->qsmaskinit != 0) {
+                        spin_unlock(&rnp->lock); /* irqs already disabled. */
+                        break;
+                }
+                mask = rnp->grpmask;
+                spin_unlock(&rnp->lock);        /* irqs already disabled. */
+                rnp = rnp->parent;
+        } while (rnp != NULL);
+        lastcomp = rsp->completed;
+
+        spin_unlock(&rsp->onofflock);           /* irqs remain disabled. */
+
+        /* Being offline is a quiescent state, so go record it. */
+        cpu_quiet(cpu, rsp, rdp, lastcomp);
+
+        /*
+         * Move callbacks from the outgoing CPU to the running CPU.
+         * Note that the outgoing CPU is now quiscent, so it is now
+         * (uncharacteristically) safe to access it rcu_data structure.
+         * Note also that we must carefully retain the order of the
+         * outgoing CPU's callbacks in order for rcu_barrier() to work
+         * correctly.  Finally, note that we start all the callbacks
+         * afresh, even those that have passed through a grace period
+         * and are therefore ready to invoke.  The theory is that hotplug
+         * events are rare, and that if they are frequent enough to
+         * indefinitely delay callbacks, you have far worse things to
+         * be worrying about.
+         */
+        rdp_me = rsp->rda[smp_processor_id()];
+        if (rdp->nxtlist != NULL) {
+                *rdp_me->nxttail[RCU_NEXT_TAIL] = rdp->nxtlist;
+                rdp_me->nxttail[RCU_NEXT_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+                rdp->nxtlist = NULL;
+                for (i = 0; i < RCU_NEXT_SIZE; i++)
+                        rdp->nxttail[i] = &rdp->nxtlist;
+                rdp_me->qlen += rdp->qlen;
+                rdp->qlen = 0;
+        }
+        local_irq_restore(flags);
+}
+
+/*
+ * Remove the specified CPU from the RCU hierarchy and move any pending
+ * callbacks that it might have to the current CPU.  This code assumes
+ * that at least one CPU in the system will remain running at all times.
+ * Any attempt to offline -all- CPUs is likely to strand RCU callbacks.
+ */
+static void rcu_offline_cpu(int cpu)
+{
+        __rcu_offline_cpu(cpu, &rcu_state);
+        __rcu_offline_cpu(cpu, &rcu_bh_state);
+}
+
+#else /* #ifdef CONFIG_HOTPLUG_CPU */
+
+static void rcu_offline_cpu(int cpu)
+{
+}
+
+#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
+
+/*
+ * Invoke any RCU callbacks that have made it to the end of their grace
+ * period.  Thottle as specified by rdp->blimit.
+ */
+static void rcu_do_batch(struct rcu_data *rdp)
+{
+        unsigned long flags;
+        struct rcu_head *next, *list, **tail;
+        int count;
+
+        /* If no callbacks are ready, just return.*/
+        if (!cpu_has_callbacks_ready_to_invoke(rdp))
+                return;
+
+        /*
+         * Extract the list of ready callbacks, disabling to prevent
+         * races with call_rcu() from interrupt handlers.
+         */
+        local_irq_save(flags);
+        list = rdp->nxtlist;
+        rdp->nxtlist = *rdp->nxttail[RCU_DONE_TAIL];
+        *rdp->nxttail[RCU_DONE_TAIL] = NULL;
+        tail = rdp->nxttail[RCU_DONE_TAIL];
+        for (count = RCU_NEXT_SIZE - 1; count >= 0; count--)
+                if (rdp->nxttail[count] == rdp->nxttail[RCU_DONE_TAIL])
+                        rdp->nxttail[count] = &rdp->nxtlist;
+        local_irq_restore(flags);
+
+        /* Invoke callbacks. */
+        count = 0;
+        while (list) {
+                next = list->next;
+                prefetch(next);
+                list->func(list);
+                list = next;
+                if (++count >= rdp->blimit)
+                        break;
+        }
+
+        local_irq_save(flags);
+
+        /* Update count, and requeue any remaining callbacks. */
+        rdp->qlen -= count;
+        if (list != NULL) {
+                *tail = rdp->nxtlist;
+                rdp->nxtlist = list;
+                for (count = 0; count < RCU_NEXT_SIZE; count++)
+                        if (&rdp->nxtlist == rdp->nxttail[count])
+                                rdp->nxttail[count] = tail;
+                        else
+                                break;
+        }
+
+        /* Reinstate batch limit if we have worked down the excess. */
+        if (rdp->blimit == LONG_MAX && rdp->qlen <= qlowmark)
+                rdp->blimit = blimit;
+
+        local_irq_restore(flags);
+
+        /* Re-raise the RCU softirq if there are callbacks remaining. */
+        if (cpu_has_callbacks_ready_to_invoke(rdp))
+                raise_softirq(RCU_SOFTIRQ);
+}
+
+/*
+ * Check to see if this CPU is in a non-context-switch quiescent state
+ * (user mode or idle loop for rcu, non-softirq execution for rcu_bh).
+ * Also schedule the RCU softirq handler.
+ *
+ * This function must be called with hardirqs disabled.  It is normally
+ * invoked from the scheduling-clock interrupt.  If rcu_pending returns
+ * false, there is no point in invoking rcu_check_callbacks().
+ */
+void rcu_check_callbacks(int cpu, int user)
+{
+        if (user ||
+            (idle_cpu(cpu) && !in_softirq() &&
+                                hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+
+                /*
+                 * Get here if this CPU took its interrupt from user
+                 * mode or from the idle loop, and if this is not a
+                 * nested interrupt.  In this case, the CPU is in
+                 * a quiescent state, so count it.
+                 *
+                 * No memory barrier is required here because both
+                 * rcu_qsctr_inc() and rcu_bh_qsctr_inc() reference
+                 * only CPU-local variables that other CPUs neither
+                 * access nor modify, at least not while the corresponding
+                 * CPU is online.
+                 */
+
+                rcu_qsctr_inc(cpu);
+                rcu_bh_qsctr_inc(cpu);
+
+        } else if (!in_softirq()) {
+
+                /*
+                 * Get here if this CPU did not take its interrupt from
+                 * softirq, in other words, if it is not interrupting
+                 * a rcu_bh read-side critical section.  This is an _bh
+                 * critical section, so count it.
+                 */
+
+                rcu_bh_qsctr_inc(cpu);
+        }
+        raise_softirq(RCU_SOFTIRQ);
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * Scan the leaf rcu_node structures, processing dyntick state for any that
+ * have not yet encountered a quiescent state, using the function specified.
+ * Returns 1 if the current grace period ends while scanning (possibly
+ * because we made it end).
+ */
+static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
+                               int (*f)(struct rcu_data *))
+{
+        unsigned long bit;
+        int cpu;
+        unsigned long flags;
+        unsigned long mask;
+        struct rcu_node *rnp_cur = rsp->level[NUM_RCU_LVLS - 1];
+        struct rcu_node *rnp_end = &rsp->node[NUM_RCU_NODES];
+
+        for (; rnp_cur < rnp_end; rnp_cur++) {
+                mask = 0;
+                spin_lock_irqsave(&rnp_cur->lock, flags);
+                if (rsp->completed != lastcomp) {
+                        spin_unlock_irqrestore(&rnp_cur->lock, flags);
+                        return 1;
+                }
+                if (rnp_cur->qsmask == 0) {
+                        spin_unlock_irqrestore(&rnp_cur->lock, flags);
+                        continue;
+                }
+                cpu = rnp_cur->grplo;
+                bit = 1;
+                for (; cpu <= rnp_cur->grphi; cpu++, bit <<= 1) {
+                        if ((rnp_cur->qsmask & bit) != 0 && f(rsp->rda[cpu]))
+                                mask |= bit;
+                }
+                if (mask != 0 && rsp->completed == lastcomp) {
+
+                        /* cpu_quiet_msk() releases rnp_cur->lock. */
+                        cpu_quiet_msk(mask, rsp, rnp_cur, flags);
+                        continue;
+                }
+                spin_unlock_irqrestore(&rnp_cur->lock, flags);
+        }
+        return 0;
+}
+
+/*
+ * Force quiescent states on reluctant CPUs, and also detect which
+ * CPUs are in dyntick-idle mode.
+ */
+static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
+{
+        unsigned long flags;
+        long lastcomp;
+        struct rcu_data *rdp = rsp->rda[smp_processor_id()];
+        struct rcu_node *rnp = rcu_get_root(rsp);
+        u8 signaled;
+
+        if (ACCESS_ONCE(rsp->completed) == ACCESS_ONCE(rsp->gpnum))
+                return;  /* No grace period in progress, nothing to force. */
+        if (!spin_trylock_irqsave(&rsp->fqslock, flags)) {
+                rsp->n_force_qs_lh++; /* Inexact, can lose counts.  Tough! */
+                return; /* Someone else is already on the job. */
+        }
+        if (relaxed &&
+            (long)(rsp->jiffies_force_qs - jiffies) >= 0 &&
+            (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) >= 0)
+                goto unlock_ret; /* no emergency and done recently. */
+        rsp->n_force_qs++;
+        spin_lock(&rnp->lock);
+        lastcomp = rsp->completed;
+        signaled = rsp->signaled;
+        rsp->jiffies_force_qs = jiffies + RCU_JIFFIES_TILL_FORCE_QS;
+        rdp->n_rcu_pending_force_qs = rdp->n_rcu_pending +
+                                      RCU_JIFFIES_TILL_FORCE_QS;
+        if (lastcomp == rsp->gpnum) {
+                rsp->n_force_qs_ngp++;
+                spin_unlock(&rnp->lock);
+                goto unlock_ret;  /* no GP in progress, time updated. */
+        }
+        spin_unlock(&rnp->lock);
+        switch (signaled) {
+        case RCU_GP_INIT:
+
+                break; /* grace period still initializing, ignore. */
+
+        case RCU_SAVE_DYNTICK:
+
+                if (RCU_SIGNAL_INIT != RCU_SAVE_DYNTICK)
+                        break; /* So gcc recognizes the dead code. */
+
+                /* Record dyntick-idle state. */
+                if (rcu_process_dyntick(rsp, lastcomp,
+                                        dyntick_save_progress_counter))
+                        goto unlock_ret;
+
+                /* Update state, record completion counter. */
+                spin_lock(&rnp->lock);
+                if (lastcomp == rsp->completed) {
+                        rsp->signaled = RCU_FORCE_QS;
+                        dyntick_record_completed(rsp, lastcomp);
+                }
+                spin_unlock(&rnp->lock);
+                break;
+
+        case RCU_FORCE_QS:
+
+                /* Check dyntick-idle state, send IPI to laggarts. */
+                if (rcu_process_dyntick(rsp, dyntick_recall_completed(rsp),
+                                        rcu_implicit_dynticks_qs))
+                        goto unlock_ret;
+
+                /* Leave state in case more forcing is required. */
+
+                break;
+        }
+unlock_ret:
+        spin_unlock_irqrestore(&rsp->fqslock, flags);
+}
+
+#else /* #ifdef CONFIG_SMP */
+
+static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
+{
+        set_need_resched();
+}
+
+#endif /* #else #ifdef CONFIG_SMP */
+
+/*
+ * This does the RCU processing work from softirq context for the
+ * specified rcu_state and rcu_data structures.  This may be called
+ * only from the CPU to whom the rdp belongs.
+ */
+static void
+__rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        unsigned long flags;
+
+        /*
+         * If an RCU GP has gone long enough, go check for dyntick
+         * idle CPUs and, if needed, send resched IPIs.
+         */
+        if ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0 ||
+            (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) < 0)
+                force_quiescent_state(rsp, 1);
+
+        /*
+         * Advance callbacks in response to end of earlier grace
+         * period that some other CPU ended.
+         */
+        rcu_process_gp_end(rsp, rdp);
+
+        /* Update RCU state based on any recent quiescent states. */
+        rcu_check_quiescent_state(rsp, rdp);
+
+        /* Does this CPU require a not-yet-started grace period? */
+        if (cpu_needs_another_gp(rsp, rdp)) {
+                spin_lock_irqsave(&rcu_get_root(rsp)->lock, flags);
+                rcu_start_gp(rsp, flags);  /* releases above lock */
+        }
+
+        /* If there are callbacks ready, invoke them. */
+        rcu_do_batch(rdp);
+}
+
+/*
+ * Do softirq processing for the current CPU.
+ */
+static void rcu_process_callbacks(struct softirq_action *unused)
+{
+        /*
+         * Memory references from any prior RCU read-side critical sections
+         * executed by the interrupted code must be seen before any RCU
+         * grace-period manipulations below.
+         */
+        smp_mb(); /* See above block comment. */
+
+        __rcu_process_callbacks(&rcu_state, &__get_cpu_var(rcu_data));
+        __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));
+
+        /*
+         * Memory references from any later RCU read-side critical sections
+         * executed by the interrupted code must be seen after any RCU
+         * grace-period manipulations above.
+         */
+        smp_mb(); /* See above block comment. */
+}
+
+static void
+__call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
+           struct rcu_state *rsp)
+{
+        unsigned long flags;
+        struct rcu_data *rdp;
+
+        head->func = func;
+        head->next = NULL;
+
+        smp_mb(); /* Ensure RCU update seen before callback registry. */
+
+        /*
+         * Opportunistically note grace-period endings and beginnings.
+         * Note that we might see a beginning right after we see an
+         * end, but never vice versa, since this CPU has to pass through
+         * a quiescent state betweentimes.
+         */
+        local_irq_save(flags);
+        rdp = rsp->rda[smp_processor_id()];
+        rcu_process_gp_end(rsp, rdp);
+        check_for_new_grace_period(rsp, rdp);
+
+        /* Add the callback to our list. */
+        *rdp->nxttail[RCU_NEXT_TAIL] = head;
+        rdp->nxttail[RCU_NEXT_TAIL] = &head->next;
+
+        /* Start a new grace period if one not already started. */
+        if (ACCESS_ONCE(rsp->completed) == ACCESS_ONCE(rsp->gpnum)) {
+                unsigned long nestflag;
+                struct rcu_node *rnp_root = rcu_get_root(rsp);
+
+                spin_lock_irqsave(&rnp_root->lock, nestflag);
+                rcu_start_gp(rsp, nestflag);  /* releases rnp_root->lock. */
+        }
+
+        /* Force the grace period if too many callbacks or too long waiting. */
+        if (unlikely(++rdp->qlen > qhimark)) {
+                rdp->blimit = LONG_MAX;
+                force_quiescent_state(rsp, 0);
+        } else if ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0 ||
+                   (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) < 0)
+                force_quiescent_state(rsp, 1);
+        local_irq_restore(flags);
+}
+
+/*
+ * Queue an RCU callback for invocation after a grace period.
+ */
+void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
+{
+        __call_rcu(head, func, &rcu_state);
+}
+EXPORT_SYMBOL_GPL(call_rcu);
+
+/*
+ * Queue an RCU for invocation after a quicker grace period.
+ */
+void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
+{
+        __call_rcu(head, func, &rcu_bh_state);
+}
+EXPORT_SYMBOL_GPL(call_rcu_bh);
+
+/*
+ * Check to see if there is any immediate RCU-related work to be done
+ * by the current CPU, for the specified type of RCU, returning 1 if so.
+ * The checks are in order of increasing expense: checks that can be
+ * carried out against CPU-local state are performed first.  However,
+ * we must check for CPU stalls first, else we might not get a chance.
+ */
+static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+        rdp->n_rcu_pending++;
+
+        /* Check for CPU stalls, if enabled. */
+        check_cpu_stall(rsp, rdp);
+
+        /* Is the RCU core waiting for a quiescent state from this CPU? */
+        if (rdp->qs_pending)
+                return 1;
+
+        /* Does this CPU have callbacks ready to invoke? */
+        if (cpu_has_callbacks_ready_to_invoke(rdp))
+                return 1;
+
+        /* Has RCU gone idle with this CPU needing another grace period? */
+        if (cpu_needs_another_gp(rsp, rdp))
+                return 1;
+
+        /* Has another RCU grace period completed?  */
+        if (ACCESS_ONCE(rsp->completed) != rdp->completed) /* outside of lock */
+                return 1;
+
+        /* Has a new RCU grace period started? */
+        if (ACCESS_ONCE(rsp->gpnum) != rdp->gpnum) /* outside of lock */
+                return 1;
+
+        /* Has an RCU GP gone long enough to send resched IPIs &c? */
+        if (ACCESS_ONCE(rsp->completed) != ACCESS_ONCE(rsp->gpnum) &&
+            ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0 ||
+             (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) < 0))
+                return 1;
+
+        /* nothing to do */
+        return 0;
+}
+
+/*
+ * Check to see if there is any immediate RCU-related work to be done
+ * by the current CPU, returning 1 if so.  This function is part of the
+ * RCU implementation; it is -not- an exported member of the RCU API.
+ */
+int rcu_pending(int cpu)
+{
+        return __rcu_pending(&rcu_state, &per_cpu(rcu_data, cpu)) ||
+               __rcu_pending(&rcu_bh_state, &per_cpu(rcu_bh_data, cpu));
+}
+
+/*
+ * Check to see if any future RCU-related work will need to be done
+ * by the current CPU, even if none need be done immediately, returning
+ * 1 if so.  This function is part of the RCU implementation; it is -not-
+ * an exported member of the RCU API.
+ */
+int rcu_needs_cpu(int cpu)
+{
+        /* RCU callbacks either ready or pending? */
+        return per_cpu(rcu_data, cpu).nxtlist ||
+               per_cpu(rcu_bh_data, cpu).nxtlist;
+}
+
+/*
+ * Initialize a CPU's per-CPU RCU data.  We take this "scorched earth"
+ * approach so that we don't have to worry about how long the CPU has
+ * been gone, or whether it ever was online previously.  We do trust the
+ * ->mynode field, as it is constant for a given struct rcu_data and
+ * initialized during early boot.
+ *
+ * Note that only one online or offline event can be happening at a given
+ * time.  Note also that we can accept some slop in the rsp->completed
+ * access due to the fact that this CPU cannot possibly have any RCU
+ * callbacks in flight yet.
+ */
+static void
+rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
+{
+        unsigned long flags;
+        int i;
+        long lastcomp;
+        unsigned long mask;
+        struct rcu_data *rdp = rsp->rda[cpu];
+        struct rcu_node *rnp = rcu_get_root(rsp);
+
+        /* Set up local state, ensuring consistent view of global state. */
+        spin_lock_irqsave(&rnp->lock, flags);
+        lastcomp = rsp->completed;
+        rdp->completed = lastcomp;
+        rdp->gpnum = lastcomp;
+        rdp->passed_quiesc = 0;  /* We could be racing with new GP, */
+        rdp->qs_pending = 1;     /*  so set up to respond to current GP. */
+        rdp->beenonline = 1;     /* We have now been online. */
+        rdp->passed_quiesc_completed = lastcomp - 1;
+        rdp->grpmask = 1UL << (cpu - rdp->mynode->grplo);
+        rdp->nxtlist = NULL;
+        for (i = 0; i < RCU_NEXT_SIZE; i++)
+                rdp->nxttail[i] = &rdp->nxtlist;
+        rdp->qlen = 0;
+        rdp->blimit = blimit;
+#ifdef CONFIG_NO_HZ
+        rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
+#endif /* #ifdef CONFIG_NO_HZ */
+        rdp->cpu = cpu;
+        spin_unlock(&rnp->lock);                /* irqs remain disabled. */
+
+        /*
+         * A new grace period might start here.  If so, we won't be part
+         * of it, but that is OK, as we are currently in a quiescent state.
+         */
+
+        /* Exclude any attempts to start a new GP on large systems. */
+        spin_lock(&rsp->onofflock);             /* irqs already disabled. */
+
+        /* Add CPU to rcu_node bitmasks. */
+        rnp = rdp->mynode;
+        mask = rdp->grpmask;
+        do {
+                /* Exclude any attempts to start a new GP on small systems. */
+                spin_lock(&rnp->lock);  /* irqs already disabled. */
+                rnp->qsmaskinit |= mask;
+                mask = rnp->grpmask;
+                spin_unlock(&rnp->lock); /* irqs already disabled. */
+                rnp = rnp->parent;
+        } while (rnp != NULL && !(rnp->qsmaskinit & mask));
+
+        spin_unlock(&rsp->onofflock);           /* irqs remain disabled. */
+
+        /*
+         * A new grace period might start here.  If so, we will be part of
+         * it, and its gpnum will be greater than ours, so we will
+         * participate.  It is also possible for the gpnum to have been
+         * incremented before this function was called, and the bitmasks
+         * to not be filled out until now, in which case we will also
+         * participate due to our gpnum being behind.
+         */
+
+        /* Since it is coming online, the CPU is in a quiescent state. */
+        cpu_quiet(cpu, rsp, rdp, lastcomp);
+        local_irq_restore(flags);
+}
+
+static void __cpuinit rcu_online_cpu(int cpu)
+{
+#ifdef CONFIG_NO_HZ
+        struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu);
+
+        rdtp->dynticks_nesting = 1;
+        rdtp->dynticks |= 1;    /* need consecutive #s even for hotplug. */
+        rdtp->dynticks_nmi = (rdtp->dynticks_nmi + 1) & ~0x1;
+#endif /* #ifdef CONFIG_NO_HZ */
+        rcu_init_percpu_data(cpu, &rcu_state);
+        rcu_init_percpu_data(cpu, &rcu_bh_state);
+        open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+}
+
+/*
+ * Handle CPU online/offline notifcation events.
+ */
+static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
+                                unsigned long action, void *hcpu)
+{
+        long cpu = (long)hcpu;
+
+        switch (action) {
+        case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
+                rcu_online_cpu(cpu);
+                break;
+        case CPU_DEAD:
+        case CPU_DEAD_FROZEN:
+        case CPU_UP_CANCELED:
+        case CPU_UP_CANCELED_FROZEN:
+                rcu_offline_cpu(cpu);
+                break;
+        default:
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+/*
+ * Compute the per-level fanout, either using the exact fanout specified
+ * or balancing the tree, depending on CONFIG_RCU_FANOUT_EXACT.
+ */
+#ifdef CONFIG_RCU_FANOUT_EXACT
+static void __init rcu_init_levelspread(struct rcu_state *rsp)
+{
+        int i;
+
+        for (i = NUM_RCU_LVLS - 1; i >= 0; i--)
+                rsp->levelspread[i] = CONFIG_RCU_FANOUT;
+}
+#else /* #ifdef CONFIG_RCU_FANOUT_EXACT */
+static void __init rcu_init_levelspread(struct rcu_state *rsp)
+{
+        int ccur;
+        int cprv;
+        int i;
+
+        cprv = NR_CPUS;
+        for (i = NUM_RCU_LVLS - 1; i >= 0; i--) {
+                ccur = rsp->levelcnt[i];
+                rsp->levelspread[i] = (cprv + ccur - 1) / ccur;
+                cprv = ccur;
+        }
+}
+#endif /* #else #ifdef CONFIG_RCU_FANOUT_EXACT */
+
+/*
+ * Helper function for rcu_init() that initializes one rcu_state structure.
+ */
+static void __init rcu_init_one(struct rcu_state *rsp)
+{
+        int cpustride = 1;
+        int i;
+        int j;
+        struct rcu_node *rnp;
+
+        /* Initialize the level-tracking arrays. */
+
+        for (i = 1; i < NUM_RCU_LVLS; i++)
+                rsp->level[i] = rsp->level[i - 1] + rsp->levelcnt[i - 1];
+        rcu_init_levelspread(rsp);
+
+        /* Initialize the elements themselves, starting from the leaves. */
+
+        for (i = NUM_RCU_LVLS - 1; i >= 0; i--) {
+                cpustride *= rsp->levelspread[i];
+                rnp = rsp->level[i];
+                for (j = 0; j < rsp->levelcnt[i]; j++, rnp++) {
+                        spin_lock_init(&rnp->lock);
+                        rnp->qsmask = 0;
+                        rnp->qsmaskinit = 0;
+                        rnp->grplo = j * cpustride;
+                        rnp->grphi = (j + 1) * cpustride - 1;
+                        if (rnp->grphi >= NR_CPUS)
+                                rnp->grphi = NR_CPUS - 1;
+                        if (i == 0) {
+                                rnp->grpnum = 0;
+                                rnp->grpmask = 0;
+                                rnp->parent = NULL;
+                        } else {
+                                rnp->grpnum = j % rsp->levelspread[i - 1];
+                                rnp->grpmask = 1UL << rnp->grpnum;
+                                rnp->parent = rsp->level[i - 1] +
+                                              j / rsp->levelspread[i - 1];
+                        }
+                        rnp->level = i;
+                }
+        }
+}
+
+/*
+ * Helper macro for __rcu_init().  To be used nowhere else!
+ * Assigns leaf node pointers into each CPU's rcu_data structure.
+ */
+#define RCU_DATA_PTR_INIT(rsp, rcu_data) \
+do { \
+        rnp = (rsp)->level[NUM_RCU_LVLS - 1]; \
+        j = 0; \
+        for_each_possible_cpu(i) { \
+                if (i > rnp[j].grphi) \
+                        j++; \
+                per_cpu(rcu_data, i).mynode = &rnp[j]; \
+                (rsp)->rda[i] = &per_cpu(rcu_data, i); \
+        } \
+} while (0)
+
+static struct notifier_block __cpuinitdata rcu_nb = {
+        .notifier_call  = rcu_cpu_notify,
+};
+
+void __init __rcu_init(void)
+{
+        int i;                  /* All used by RCU_DATA_PTR_INIT(). */
+        int j;
+        struct rcu_node *rnp;
+
+        printk(KERN_WARNING "Experimental hierarchical RCU implementation.\n");
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
+        printk(KERN_INFO "RCU-based detection of stalled CPUs is enabled.\n");
+#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+        rcu_init_one(&rcu_state);
+        RCU_DATA_PTR_INIT(&rcu_state, rcu_data);
+        rcu_init_one(&rcu_bh_state);
+        RCU_DATA_PTR_INIT(&rcu_bh_state, rcu_bh_data);
+
+        for_each_online_cpu(i)
+                rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, (void *)(long)i);
+        /* Register notifier for non-boot CPUs */
+        register_cpu_notifier(&rcu_nb);
+        printk(KERN_WARNING "Experimental hierarchical RCU init done.\n");
+}
+
+module_param(blimit, int, 0);
+module_param(qhimark, int, 0);
+module_param(qlowmark, int, 0);
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
new file mode 100644
index 000000000000..d6db3e837826
--- /dev/null
+++ b/kernel/rcutree_trace.c
@@ -0,0 +1,271 @@
+/*
+ * Read-Copy Update tracing for classic implementation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2008
+ *
+ * Papers:  http://www.rdrop.com/users/paulmck/RCU
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ *              Documentation/RCU
+ *
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/rcupdate.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/moduleparam.h>
+#include <linux/percpu.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/mutex.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
+{
+        if (!rdp->beenonline)
+                return;
+        seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d rpfq=%ld rp=%x",
+                   rdp->cpu,
+                   cpu_is_offline(rdp->cpu) ? '!' : ' ',
+                   rdp->completed, rdp->gpnum,
+                   rdp->passed_quiesc, rdp->passed_quiesc_completed,
+                   rdp->qs_pending,
+                   rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending,
+                   (int)(rdp->n_rcu_pending & 0xffff));
+#ifdef CONFIG_NO_HZ
+        seq_printf(m, " dt=%d/%d dn=%d df=%lu",
+                   rdp->dynticks->dynticks,
+                   rdp->dynticks->dynticks_nesting,
+                   rdp->dynticks->dynticks_nmi,
+                   rdp->dynticks_fqs);
+#endif /* #ifdef CONFIG_NO_HZ */
+        seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
+        seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit);
+}
+
+#define PRINT_RCU_DATA(name, func, m) \
+        do { \
+                int _p_r_d_i; \
+                \
+                for_each_possible_cpu(_p_r_d_i) \
+                        func(m, &per_cpu(name, _p_r_d_i)); \
+        } while (0)
+
+static int show_rcudata(struct seq_file *m, void *unused)
+{
+        seq_puts(m, "rcu:\n");
+        PRINT_RCU_DATA(rcu_data, print_one_rcu_data, m);
+        seq_puts(m, "rcu_bh:\n");
+        PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
+        return 0;
+}
+
+static int rcudata_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, show_rcudata, NULL);
+}
+
+static struct file_operations rcudata_fops = {
+        .owner = THIS_MODULE,
+        .open = rcudata_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
+{
+        if (!rdp->beenonline)
+                return;
+        seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d,%ld,%ld",
+                   rdp->cpu,
+                   cpu_is_offline(rdp->cpu) ? "\"Y\"" : "\"N\"",
+                   rdp->completed, rdp->gpnum,
+                   rdp->passed_quiesc, rdp->passed_quiesc_completed,
+                   rdp->qs_pending,
+                   rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending,
+                   rdp->n_rcu_pending);
+#ifdef CONFIG_NO_HZ
+        seq_printf(m, ",%d,%d,%d,%lu",
+                   rdp->dynticks->dynticks,
+                   rdp->dynticks->dynticks_nesting,
+                   rdp->dynticks->dynticks_nmi,
+                   rdp->dynticks_fqs);
+#endif /* #ifdef CONFIG_NO_HZ */
+        seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
+        seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit);
+}
+
+static int show_rcudata_csv(struct seq_file *m, void *unused)
+{
+        seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",\"rpfq\",\"rp\",");
+#ifdef CONFIG_NO_HZ
+        seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
+#endif /* #ifdef CONFIG_NO_HZ */
+        seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n");
+        seq_puts(m, "\"rcu:\"\n");
+        PRINT_RCU_DATA(rcu_data, print_one_rcu_data_csv, m);
+        seq_puts(m, "\"rcu_bh:\"\n");
+        PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
+        return 0;
+}
+
+static int rcudata_csv_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, show_rcudata_csv, NULL);
+}
+
+static struct file_operations rcudata_csv_fops = {
+        .owner = THIS_MODULE,
+        .open = rcudata_csv_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
+{
+        int level = 0;
+        struct rcu_node *rnp;
+
+        seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
+                      "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
+                   rsp->completed, rsp->gpnum, rsp->signaled,
+                   (long)(rsp->jiffies_force_qs - jiffies),
+                   (int)(jiffies & 0xffff),
+                   rsp->n_force_qs, rsp->n_force_qs_ngp,
+                   rsp->n_force_qs - rsp->n_force_qs_ngp,
+                   rsp->n_force_qs_lh);
+        for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
+                if (rnp->level != level) {
+                        seq_puts(m, "\n");
+                        level = rnp->level;
+                }
+                seq_printf(m, "%lx/%lx %d:%d ^%d    ",
+                           rnp->qsmask, rnp->qsmaskinit,
+                           rnp->grplo, rnp->grphi, rnp->grpnum);
+        }
+        seq_puts(m, "\n");
+}
+
+static int show_rcuhier(struct seq_file *m, void *unused)
+{
+        seq_puts(m, "rcu:\n");
+        print_one_rcu_state(m, &rcu_state);
+        seq_puts(m, "rcu_bh:\n");
+        print_one_rcu_state(m, &rcu_bh_state);
+        return 0;
+}
+
+static int rcuhier_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, show_rcuhier, NULL);
+}
+
+static struct file_operations rcuhier_fops = {
+        .owner = THIS_MODULE,
+        .open = rcuhier_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int show_rcugp(struct seq_file *m, void *unused)
+{
+        seq_printf(m, "rcu: completed=%ld  gpnum=%ld\n",
+                   rcu_state.completed, rcu_state.gpnum);
+        seq_printf(m, "rcu_bh: completed=%ld  gpnum=%ld\n",
+                   rcu_bh_state.completed, rcu_bh_state.gpnum);
+        return 0;
+}
+
+static int rcugp_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, show_rcugp, NULL);
+}
+
+static struct file_operations rcugp_fops = {
+        .owner = THIS_MODULE,
+        .open = rcugp_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static struct dentry *rcudir, *datadir, *datadir_csv, *hierdir, *gpdir;
+static int __init rcuclassic_trace_init(void)
+{
+        rcudir = debugfs_create_dir("rcu", NULL);
+        if (!rcudir)
+                goto out;
+
+        datadir = debugfs_create_file("rcudata", 0444, rcudir,
+                                                NULL, &rcudata_fops);
+        if (!datadir)
+                goto free_out;
+
+        datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir,
+                                                NULL, &rcudata_csv_fops);
+        if (!datadir_csv)
+                goto free_out;
+
+        gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
+        if (!gpdir)
+                goto free_out;
+
+        hierdir = debugfs_create_file("rcuhier", 0444, rcudir,
+                                                NULL, &rcuhier_fops);
+        if (!hierdir)
+                goto free_out;
+        return 0;
+free_out:
+        if (datadir)
+                debugfs_remove(datadir);
+        if (datadir_csv)
+                debugfs_remove(datadir_csv);
+        if (gpdir)
+                debugfs_remove(gpdir);
+        debugfs_remove(rcudir);
+out:
+        return 1;
+}
+
+static void __exit rcuclassic_trace_cleanup(void)
+{
+        debugfs_remove(datadir);
+        debugfs_remove(datadir_csv);
+        debugfs_remove(gpdir);
+        debugfs_remove(hierdir);
+        debugfs_remove(rcudir);
+}
+
+
+module_init(rcuclassic_trace_init);
+module_exit(rcuclassic_trace_cleanup);
+
+MODULE_AUTHOR("Paul E. McKenney");
+MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
+MODULE_LICENSE("GPL");
diff --git a/kernel/relay.c b/kernel/relay.c
index 32b0befdcb6a..09ac2008f77b 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1317,12 +1317,9 @@ static ssize_t relay_file_splice_read(struct file *in,
                 if (ret < 0)
                         break;
                 else if (!ret) {
-                        if (spliced)
-                                break;
-                        if (flags & SPLICE_F_NONBLOCK) {
+                        if (flags & SPLICE_F_NONBLOCK)
                                 ret = -EAGAIN;
-                                break;
-                        }
+                        break;
                 }
 
                 *ppos += ret;
diff --git a/kernel/resource.c b/kernel/resource.c
index 4337063663ef..e633106b12f6 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -853,6 +853,15 @@ int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
                 if (PFN_DOWN(p->start) <= PFN_DOWN(addr) &&
                     PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1))
                         continue;
+                /*
+                 * if a resource is "BUSY", it's not a hardware resource
+                 * but a driver mapping of such a resource; we don't want
+                 * to warn for those; some drivers legitimately map only
+                 * partial hardware resources. (example: vesafb)
+                 */
+                if (p->flags & IORESOURCE_BUSY)
+                        continue;
+
                 printk(KERN_WARNING "resource map sanity check conflict: "
                        "0x%llx 0x%llx 0x%llx 0x%llx %s\n",
                        (unsigned long long)addr,
diff --git a/kernel/sched.c b/kernel/sched.c
index b7480fb5c3dc..fff1c4a20b65 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -118,6 +118,12 @@
  */
 #define RUNTIME_INF     ((u64)~0ULL)
 
+DEFINE_TRACE(sched_wait_task);
+DEFINE_TRACE(sched_wakeup);
+DEFINE_TRACE(sched_wakeup_new);
+DEFINE_TRACE(sched_switch);
+DEFINE_TRACE(sched_migrate_task);
+
 #ifdef CONFIG_SMP
 /*
  * Divide a load by a sched group cpu_power : (load / sg->__cpu_power)
@@ -203,7 +209,6 @@ void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
         hrtimer_init(&rt_b->rt_period_timer,
                         CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         rt_b->rt_period_timer.function = sched_rt_period_timer;
-        rt_b->rt_period_timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED;
 }
 
 static inline int rt_bandwidth_enabled(void)
@@ -261,6 +266,10 @@ struct task_group {
         struct cgroup_subsys_state css;
 #endif
 
+#ifdef CONFIG_USER_SCHED
+        uid_t uid;
+#endif
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
         /* schedulable entities of this group on each cpu */
         struct sched_entity **se;
@@ -286,6 +295,12 @@ struct task_group {
 
 #ifdef CONFIG_USER_SCHED
 
+/* Helper function to pass uid information to create_sched_user() */
+void set_tg_uid(struct user_struct *user)
+{
+        user->tg->uid = user->uid;
+}
+
 /*
  * Root task group.
  *      Every UID task group (including init_task_group aka UID-0) will
@@ -345,7 +360,9 @@ static inline struct task_group *task_group(struct task_struct *p)
         struct task_group *tg;
 
 #ifdef CONFIG_USER_SCHED
-        tg = p->user->tg;
+        rcu_read_lock();
+        tg = __task_cred(p)->user->tg;
+        rcu_read_unlock();
 #elif defined(CONFIG_CGROUP_SCHED)
         tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
                                 struct task_group, css);
@@ -586,6 +603,8 @@ struct rq {
 #ifdef CONFIG_SCHEDSTATS
         /* latency stats */
         struct sched_info rq_sched_info;
+        unsigned long long rq_cpu_time;
+        /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
 
         /* sys_sched_yield() stats */
         unsigned int yld_exp_empty;
@@ -703,45 +722,18 @@ static __read_mostly char *sched_feat_names[] = {
 
 #undef SCHED_FEAT
 
-static int sched_feat_open(struct inode *inode, struct file *filp)
-{
-        filp->private_data = inode->i_private;
-        return 0;
-}
-
-static ssize_t
-sched_feat_read(struct file *filp, char __user *ubuf,
-                size_t cnt, loff_t *ppos)
+static int sched_feat_show(struct seq_file *m, void *v)
 {
-        char *buf;
-        int r = 0;
-        int len = 0;
         int i;
 
         for (i = 0; sched_feat_names[i]; i++) {
-                len += strlen(sched_feat_names[i]);
-                len += 4;
-        }
-
-        buf = kmalloc(len + 2, GFP_KERNEL);
-        if (!buf)
-                return -ENOMEM;
-
-        for (i = 0; sched_feat_names[i]; i++) {
-                if (sysctl_sched_features & (1UL << i))
-                        r += sprintf(buf + r, "%s ", sched_feat_names[i]);
-                else
-                        r += sprintf(buf + r, "NO_%s ", sched_feat_names[i]);
+                if (!(sysctl_sched_features & (1UL << i)))
+                        seq_puts(m, "NO_");
+                seq_printf(m, "%s ", sched_feat_names[i]);
         }
+        seq_puts(m, "\n");
 
-        r += sprintf(buf + r, "\n");
-        WARN_ON(r >= len + 2);
-
-        r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-
-        kfree(buf);
-
-        return r;
+        return 0;
 }
 
 static ssize_t
@@ -786,10 +778,17 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
         return cnt;
 }
 
+static int sched_feat_open(struct inode *inode, struct file *filp)
+{
+        return single_open(filp, sched_feat_show, NULL);
+}
+
 static struct file_operations sched_feat_fops = {
-        .open   = sched_feat_open,
-        .read   = sched_feat_read,
-        .write  = sched_feat_write,
+        .open           = sched_feat_open,
+        .write          = sched_feat_write,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
 };
 
 static __init int sched_init_debug(void)
@@ -1139,7 +1138,6 @@ static void init_rq_hrtick(struct rq *rq)
 
         hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         rq->hrtick_timer.function = hrtick;
-        rq->hrtick_timer.cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
 }
 #else   /* CONFIG_SCHED_HRTICK */
 static inline void hrtick_clear(struct rq *rq)
@@ -1474,27 +1472,13 @@ static void
 update_group_shares_cpu(struct task_group *tg, int cpu,
                         unsigned long sd_shares, unsigned long sd_rq_weight)
 {
-        int boost = 0;
         unsigned long shares;
         unsigned long rq_weight;
 
         if (!tg->se[cpu])
                 return;
 
-        rq_weight = tg->cfs_rq[cpu]->load.weight;
-
-        /*
-         * If there are currently no tasks on the cpu pretend there is one of
-         * average load so that when a new task gets to run here it will not
-         * get delayed by group starvation.
-         */
-        if (!rq_weight) {
-                boost = 1;
-                rq_weight = NICE_0_LOAD;
-        }
-
-        if (unlikely(rq_weight > sd_rq_weight))
-                rq_weight = sd_rq_weight;
+        rq_weight = tg->cfs_rq[cpu]->rq_weight;
 
         /*
          *           \Sum shares * rq_weight
@@ -1502,7 +1486,7 @@ update_group_shares_cpu(struct task_group *tg, int cpu,
          *               \Sum rq_weight
          *
          */
-        shares = (sd_shares * rq_weight) / (sd_rq_weight + 1);
+        shares = (sd_shares * rq_weight) / sd_rq_weight;
         shares = clamp_t(unsigned long, shares, MIN_SHARES, MAX_SHARES);
 
         if (abs(shares - tg->se[cpu]->load.weight) >
@@ -1511,11 +1495,7 @@ update_group_shares_cpu(struct task_group *tg, int cpu,
                 unsigned long flags;
 
                 spin_lock_irqsave(&rq->lock, flags);
-                /*
-                 * record the actual number of shares, not the boosted amount.
-                 */
-                tg->cfs_rq[cpu]->shares = boost ? 0 : shares;
-                tg->cfs_rq[cpu]->rq_weight = rq_weight;
+                tg->cfs_rq[cpu]->shares = shares;
 
                 __set_se_shares(tg->se[cpu], shares);
                 spin_unlock_irqrestore(&rq->lock, flags);
@@ -1529,13 +1509,23 @@ update_group_shares_cpu(struct task_group *tg, int cpu,
  */
 static int tg_shares_up(struct task_group *tg, void *data)
 {
-        unsigned long rq_weight = 0;
+        unsigned long weight, rq_weight = 0;
         unsigned long shares = 0;
         struct sched_domain *sd = data;
         int i;
 
         for_each_cpu_mask(i, sd->span) {
-                rq_weight += tg->cfs_rq[i]->load.weight;
+                /*
+                 * If there are currently no tasks on the cpu pretend there
+                 * is one of average load so that when a new task gets to
+                 * run here it will not get delayed by group starvation.
+                 */
+                weight = tg->cfs_rq[i]->load.weight;
+                if (!weight)
+                        weight = NICE_0_LOAD;
+
+                tg->cfs_rq[i]->rq_weight = weight;
+                rq_weight += weight;
                 shares += tg->cfs_rq[i]->shares;
         }
 
@@ -1545,9 +1535,6 @@ static int tg_shares_up(struct task_group *tg, void *data)
         if (!sd->parent || !(sd->parent->flags & SD_LOAD_BALANCE))
                 shares = tg->shares;
 
-        if (!rq_weight)
-                rq_weight = cpus_weight(sd->span) * NICE_0_LOAD;
-
         for_each_cpu_mask(i, sd->span)
                 update_group_shares_cpu(tg, i, shares, rq_weight);
 
@@ -1612,6 +1599,39 @@ static inline void update_shares_locked(struct rq *rq, struct sched_domain *sd)
 
 #endif
 
+/*
+ * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
+ */
+static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
+        __releases(this_rq->lock)
+        __acquires(busiest->lock)
+        __acquires(this_rq->lock)
+{
+        int ret = 0;
+
+        if (unlikely(!irqs_disabled())) {
+                /* printk() doesn't work good under rq->lock */
+                spin_unlock(&this_rq->lock);
+                BUG_ON(1);
+        }
+        if (unlikely(!spin_trylock(&busiest->lock))) {
+                if (busiest < this_rq) {
+                        spin_unlock(&this_rq->lock);
+                        spin_lock(&busiest->lock);
+                        spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
+                        ret = 1;
+                } else
+                        spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
+        }
+        return ret;
+}
+
+static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
+        __releases(busiest->lock)
+{
+        spin_unlock(&busiest->lock);
+        lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
+}
 #endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1845,6 +1865,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 
         clock_offset = old_rq->clock - new_rq->clock;
 
+        trace_sched_migrate_task(p, task_cpu(p), new_cpu);
+
 #ifdef CONFIG_SCHEDSTATS
         if (p->se.wait_start)
                 p->se.wait_start -= clock_offset;
@@ -2254,6 +2276,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
 
         smp_wmb();
         rq = task_rq_lock(p, &flags);
+        update_rq_clock(rq);
         old_state = p->state;
         if (!(old_state & state))
                 goto out;
@@ -2311,12 +2334,11 @@ out_activate:
                 schedstat_inc(p, se.nr_wakeups_local);
         else
                 schedstat_inc(p, se.nr_wakeups_remote);
-        update_rq_clock(rq);
         activate_task(rq, p, 1);
         success = 1;
 
 out_running:
-        trace_sched_wakeup(rq, p);
+        trace_sched_wakeup(rq, p, success);
         check_preempt_curr(rq, p, sync);
 
         p->state = TASK_RUNNING;
@@ -2449,7 +2471,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
                 p->sched_class->task_new(rq, p);
                 inc_nr_running(rq);
         }
-        trace_sched_wakeup_new(rq, p);
+        trace_sched_wakeup_new(rq, p, 1);
         check_preempt_curr(rq, p, 0);
 #ifdef CONFIG_SMP
         if (p->sched_class->task_wake_up)
@@ -2812,40 +2834,6 @@ static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
 }
 
 /*
- * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
- */
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
-        __releases(this_rq->lock)
-        __acquires(busiest->lock)
-        __acquires(this_rq->lock)
-{
-        int ret = 0;
-
-        if (unlikely(!irqs_disabled())) {
-                /* printk() doesn't work good under rq->lock */
-                spin_unlock(&this_rq->lock);
-                BUG_ON(1);
-        }
-        if (unlikely(!spin_trylock(&busiest->lock))) {
-                if (busiest < this_rq) {
-                        spin_unlock(&this_rq->lock);
-                        spin_lock(&busiest->lock);
-                        spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
-                        ret = 1;
-                } else
-                        spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
-        }
-        return ret;
-}
-
-static void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
-        __releases(busiest->lock)
-{
-        spin_unlock(&busiest->lock);
-        lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
-}
-
-/*
  * If dest_cpu is allowed for this process, migrate the task to it.
  * This is accomplished by forcing the cpu_allowed mask to only
  * allow dest_cpu, which will force the cpu onto dest_cpu. Then
@@ -2862,7 +2850,6 @@ static void sched_migrate_task(struct task_struct *p, int dest_cpu)
             || unlikely(!cpu_active(dest_cpu)))
                 goto out;
 
-        trace_sched_migrate_task(rq, p, dest_cpu);
         /* force the process onto the specified CPU */
         if (migrate_task(p, dest_cpu, &req)) {
                 /* Need to wait for migration thread (might exit: take ref). */
@@ -3707,7 +3694,7 @@ out_balanced:
 static void idle_balance(int this_cpu, struct rq *this_rq)
 {
         struct sched_domain *sd;
-        int pulled_task = -1;
+        int pulled_task = 0;
         unsigned long next_balance = jiffies + HZ;
         cpumask_t tmpmask;
 
@@ -4203,7 +4190,6 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
 
         if (p == rq->idle) {
                 p->stime = cputime_add(p->stime, steal);
-                account_group_system_time(p, steal);
                 if (atomic_read(&rq->nr_iowait) > 0)
                         cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
                 else
@@ -4339,7 +4325,7 @@ void __kprobes sub_preempt_count(int val)
         /*
          * Underflow?
          */
-        if (DEBUG_LOCKS_WARN_ON(val > preempt_count()))
+       if (DEBUG_LOCKS_WARN_ON(val > preempt_count() - (!!kernel_locked())))
                 return;
         /*
          * Is the spinlock portion underflowing?
@@ -5134,6 +5120,22 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
         set_load_weight(p);
 }
 
+/*
+ * check the target process has a UID that matches the current process's
+ */
+static bool check_same_owner(struct task_struct *p)
+{
+        const struct cred *cred = current_cred(), *pcred;
+        bool match;
+
+        rcu_read_lock();
+        pcred = __task_cred(p);
+        match = (cred->euid == pcred->euid ||
+                 cred->euid == pcred->uid);
+        rcu_read_unlock();
+        return match;
+}
+
 static int __sched_setscheduler(struct task_struct *p, int policy,
                                 struct sched_param *param, bool user)
 {
@@ -5193,8 +5195,7 @@ recheck:
                         return -EPERM;
 
                 /* can't change other user's priorities */
-                if ((current->euid != p->euid) &&
-                    (current->euid != p->uid))
+                if (!check_same_owner(p))
                         return -EPERM;
         }
 
@@ -5426,8 +5427,7 @@ long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
         read_unlock(&tasklist_lock);
 
         retval = -EPERM;
-        if ((current->euid != p->euid) && (current->euid != p->uid) &&
-                        !capable(CAP_SYS_NICE))
+        if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
                 goto out_unlock;
 
         retval = security_task_setscheduler(p, 0, NULL);
@@ -5896,6 +5896,7 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
          * The idle tasks have their own, simple scheduling class:
          */
         idle->sched_class = &idle_sched_class;
+        ftrace_graph_init_task(idle);
 }
 
 /*
@@ -6126,7 +6127,6 @@ static int __migrate_task_irq(struct task_struct *p, int src_cpu, int dest_cpu)
 
 /*
  * Figure out where task on dead CPU should go, use force if necessary.
- * NOTE: interrupts should be disabled by the caller
  */
 static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
 {
@@ -6587,7 +6587,9 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                         req = list_entry(rq->migration_queue.next,
                                          struct migration_req, list);
                         list_del_init(&req->list);
+                        spin_unlock_irq(&rq->lock);
                         complete(&req->done);
+                        spin_lock_irq(&rq->lock);
                 }
                 spin_unlock_irq(&rq->lock);
                 break;
@@ -6636,28 +6638,6 @@ early_initcall(migration_init);
 
 #ifdef CONFIG_SCHED_DEBUG
 
-static inline const char *sd_level_to_string(enum sched_domain_level lvl)
-{
-        switch (lvl) {
-        case SD_LV_NONE:
-                        return "NONE";
-        case SD_LV_SIBLING:
-                        return "SIBLING";
-        case SD_LV_MC:
-                        return "MC";
-        case SD_LV_CPU:
-                        return "CPU";
-        case SD_LV_NODE:
-                        return "NODE";
-        case SD_LV_ALLNODES:
-                        return "ALLNODES";
-        case SD_LV_MAX:
-                        return "MAX";
-
-        }
-        return "MAX";
-}
-
 static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
                                   cpumask_t *groupmask)
 {
@@ -6677,8 +6657,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
                 return -1;
         }
 
-        printk(KERN_CONT "span %s level %s\n",
-                str, sd_level_to_string(sd->level));
+        printk(KERN_CONT "span %s level %s\n", str, sd->name);
 
         if (!cpu_isset(cpu, sd->span)) {
                 printk(KERN_ERR "ERROR: domain->span does not contain "
@@ -6814,6 +6793,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
                                 SD_BALANCE_EXEC |
                                 SD_SHARE_CPUPOWER |
                                 SD_SHARE_PKG_RESOURCES);
+                if (nr_node_ids == 1)
+                        pflags &= ~SD_SERIALIZE;
         }
         if (~cflags & pflags)
                 return 0;
@@ -7334,13 +7315,21 @@ struct allmasks {
 };
 
 #if     NR_CPUS > 128
-#define SCHED_CPUMASK_ALLOC             1
-#define SCHED_CPUMASK_FREE(v)           kfree(v)
-#define SCHED_CPUMASK_DECLARE(v)        struct allmasks *v
+#define SCHED_CPUMASK_DECLARE(v)        struct allmasks *v
+static inline void sched_cpumask_alloc(struct allmasks **masks)
+{
+        *masks = kmalloc(sizeof(**masks), GFP_KERNEL);
+}
+static inline void sched_cpumask_free(struct allmasks *masks)
+{
+        kfree(masks);
+}
 #else
-#define SCHED_CPUMASK_ALLOC             0
-#define SCHED_CPUMASK_FREE(v)
-#define SCHED_CPUMASK_DECLARE(v)        struct allmasks _v, *v = &_v
+#define SCHED_CPUMASK_DECLARE(v)        struct allmasks _v, *v = &_v
+static inline void sched_cpumask_alloc(struct allmasks **masks)
+{ }
+static inline void sched_cpumask_free(struct allmasks *masks)
+{ }
 #endif
 
 #define SCHED_CPUMASK_VAR(v, a)         cpumask_t *v = (cpumask_t *) \
@@ -7416,9 +7405,8 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 return -ENOMEM;
         }
 
-#if SCHED_CPUMASK_ALLOC
         /* get space for all scratch cpumask variables */
-        allmasks = kmalloc(sizeof(*allmasks), GFP_KERNEL);
+        sched_cpumask_alloc(&allmasks);
         if (!allmasks) {
                 printk(KERN_WARNING "Cannot alloc cpumask array\n");
                 kfree(rd);
@@ -7427,7 +7415,7 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
 #endif
                 return -ENOMEM;
         }
-#endif
+
         tmpmask = (cpumask_t *)allmasks;
 
 
@@ -7681,13 +7669,13 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 cpu_attach_domain(sd, rd, i);
         }
 
-        SCHED_CPUMASK_FREE((void *)allmasks);
+        sched_cpumask_free(allmasks);
         return 0;
 
 #ifdef CONFIG_NUMA
 error:
         free_sched_groups(cpu_map, tmpmask);
-        SCHED_CPUMASK_FREE((void *)allmasks);
+        sched_cpumask_free(allmasks);
         kfree(rd);
         return -ENOMEM;
 #endif
@@ -7710,8 +7698,14 @@ static struct sched_domain_attr *dattr_cur;
  */
 static cpumask_t fallback_doms;
 
-void __attribute__((weak)) arch_update_cpu_topology(void)
+/*
+ * arch_update_cpu_topology lets virtualized architectures update the
+ * cpu core maps. It is supposed to return 1 if the topology changed
+ * or 0 if it stayed the same.
+ */
+int __attribute__((weak)) arch_update_cpu_topology(void)
 {
+        return 0;
 }
 
 /*
@@ -7751,8 +7745,6 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
         cpumask_t tmpmask;
         int i;
 
-        unregister_sched_domain_sysctl();
-
         for_each_cpu_mask_nr(i, *cpu_map)
                 cpu_attach_domain(NULL, &def_root_domain, i);
         synchronize_sched();
@@ -7805,17 +7797,21 @@ void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
                              struct sched_domain_attr *dattr_new)
 {
         int i, j, n;
+        int new_topology;
 
         mutex_lock(&sched_domains_mutex);
 
         /* always unregister in case we don't destroy any domains */
         unregister_sched_domain_sysctl();
 
+        /* Let architecture update cpu core mappings. */
+        new_topology = arch_update_cpu_topology();
+
         n = doms_new ? ndoms_new : 0;
 
         /* Destroy deleted domains */
         for (i = 0; i < ndoms_cur; i++) {
-                for (j = 0; j < n; j++) {
+                for (j = 0; j < n && !new_topology; j++) {
                         if (cpus_equal(doms_cur[i], doms_new[j])
                             && dattrs_equal(dattr_cur, i, dattr_new, j))
                                 goto match1;
@@ -7830,12 +7826,12 @@ match1:
                 ndoms_cur = 0;
                 doms_new = &fallback_doms;
                 cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
-                dattr_new = NULL;
+                WARN_ON_ONCE(dattr_new);
         }
 
         /* Build new domains */
         for (i = 0; i < ndoms_new; i++) {
-                for (j = 0; j < ndoms_cur; j++) {
+                for (j = 0; j < ndoms_cur && !new_topology; j++) {
                         if (cpus_equal(doms_new[i], doms_cur[j])
                             && dattrs_equal(dattr_new, i, dattr_cur, j))
                                 goto match2;
@@ -8490,7 +8486,7 @@ static
 int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
 {
         struct cfs_rq *cfs_rq;
-        struct sched_entity *se, *parent_se;
+        struct sched_entity *se;
         struct rq *rq;
         int i;
 
@@ -8506,18 +8502,17 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
         for_each_possible_cpu(i) {
                 rq = cpu_rq(i);
 
-                cfs_rq = kmalloc_node(sizeof(struct cfs_rq),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
+                                      GFP_KERNEL, cpu_to_node(i));
                 if (!cfs_rq)
                         goto err;
 
-                se = kmalloc_node(sizeof(struct sched_entity),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                se = kzalloc_node(sizeof(struct sched_entity),
+                                  GFP_KERNEL, cpu_to_node(i));
                 if (!se)
                         goto err;
 
-                parent_se = parent ? parent->se[i] : NULL;
-                init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent_se);
+                init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent->se[i]);
         }
 
         return 1;
@@ -8578,7 +8573,7 @@ static
 int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
 {
         struct rt_rq *rt_rq;
-        struct sched_rt_entity *rt_se, *parent_se;
+        struct sched_rt_entity *rt_se;
         struct rq *rq;
         int i;
 
@@ -8595,18 +8590,17 @@ int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
         for_each_possible_cpu(i) {
                 rq = cpu_rq(i);
 
-                rt_rq = kmalloc_node(sizeof(struct rt_rq),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                rt_rq = kzalloc_node(sizeof(struct rt_rq),
+                                     GFP_KERNEL, cpu_to_node(i));
                 if (!rt_rq)
                         goto err;
 
-                rt_se = kmalloc_node(sizeof(struct sched_rt_entity),
-                                GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+                rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
+                                     GFP_KERNEL, cpu_to_node(i));
                 if (!rt_se)
                         goto err;
 
-                parent_se = parent ? parent->rt_se[i] : NULL;
-                init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent_se);
+                init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent->rt_se[i]);
         }
 
         return 1;
@@ -9249,11 +9243,12 @@ struct cgroup_subsys cpu_cgroup_subsys = {
  * (balbir@in.ibm.com).
  */
 
-/* track cpu usage of a group of tasks */
+/* track cpu usage of a group of tasks and its child groups */
 struct cpuacct {
         struct cgroup_subsys_state css;
         /* cpuusage holds pointer to a u64-type object on every cpu */
         u64 *cpuusage;
+        struct cpuacct *parent;
 };
 
 struct cgroup_subsys cpuacct_subsys;
@@ -9287,6 +9282,9 @@ static struct cgroup_subsys_state *cpuacct_create(
                 return ERR_PTR(-ENOMEM);
         }
 
+        if (cgrp->parent)
+                ca->parent = cgroup_ca(cgrp->parent);
+
         return &ca->css;
 }
 
@@ -9300,6 +9298,41 @@ cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
         kfree(ca);
 }
 
+static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
+{
+        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+        u64 data;
+
+#ifndef CONFIG_64BIT
+        /*
+         * Take rq->lock to make 64-bit read safe on 32-bit platforms.
+         */
+        spin_lock_irq(&cpu_rq(cpu)->lock);
+        data = *cpuusage;
+        spin_unlock_irq(&cpu_rq(cpu)->lock);
+#else
+        data = *cpuusage;
+#endif
+
+        return data;
+}
+
+static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
+{
+        u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+
+#ifndef CONFIG_64BIT
+        /*
+         * Take rq->lock to make 64-bit write safe on 32-bit platforms.
+         */
+        spin_lock_irq(&cpu_rq(cpu)->lock);
+        *cpuusage = val;
+        spin_unlock_irq(&cpu_rq(cpu)->lock);
+#else
+        *cpuusage = val;
+#endif
+}
+
 /* return total cpu usage (in nanoseconds) of a group */
 static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
 {
@@ -9307,17 +9340,8 @@ static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
         u64 totalcpuusage = 0;
         int i;
 
-        for_each_possible_cpu(i) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
-
-                /*
-                 * Take rq->lock to make 64-bit addition safe on 32-bit
-                 * platforms.
-                 */
-                spin_lock_irq(&cpu_rq(i)->lock);
-                totalcpuusage += *cpuusage;
-                spin_unlock_irq(&cpu_rq(i)->lock);
-        }
+        for_each_present_cpu(i)
+                totalcpuusage += cpuacct_cpuusage_read(ca, i);
 
         return totalcpuusage;
 }
@@ -9334,23 +9358,39 @@ static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,
                 goto out;
         }
 
-        for_each_possible_cpu(i) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
+        for_each_present_cpu(i)
+                cpuacct_cpuusage_write(ca, i, 0);
 
-                spin_lock_irq(&cpu_rq(i)->lock);
-                *cpuusage = 0;
-                spin_unlock_irq(&cpu_rq(i)->lock);
-        }
 out:
         return err;
 }
 
+static int cpuacct_percpu_seq_read(struct cgroup *cgroup, struct cftype *cft,
+                                   struct seq_file *m)
+{
+        struct cpuacct *ca = cgroup_ca(cgroup);
+        u64 percpu;
+        int i;
+
+        for_each_present_cpu(i) {
+                percpu = cpuacct_cpuusage_read(ca, i);
+                seq_printf(m, "%llu ", (unsigned long long) percpu);
+        }
+        seq_printf(m, "\n");
+        return 0;
+}
+
 static struct cftype files[] = {
         {
                 .name = "usage",
                 .read_u64 = cpuusage_read,
                 .write_u64 = cpuusage_write,
         },
+        {
+                .name = "usage_percpu",
+                .read_seq_string = cpuacct_percpu_seq_read,
+        },
+
 };
 
 static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
@@ -9366,14 +9406,16 @@ static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
 static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 {
         struct cpuacct *ca;
+        int cpu;
 
         if (!cpuacct_subsys.active)
                 return;
 
+        cpu = task_cpu(tsk);
         ca = task_ca(tsk);
-        if (ca) {
-                u64 *cpuusage = percpu_ptr(ca->cpuusage, task_cpu(tsk));
 
+        for (; ca; ca = ca->parent) {
+                u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
                 *cpuusage += cputime;
         }
 }
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 81787248b60f..e8ab096ddfe3 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -118,13 +118,13 @@ static u64 __update_sched_clock(struct sched_clock_data *scd, u64 now)
 
         /*
          * scd->clock = clamp(scd->tick_gtod + delta,
-         *                    max(scd->tick_gtod, scd->clock),
-         *                    max(scd->clock, scd->tick_gtod + TICK_NSEC));
+         *                    max(scd->tick_gtod, scd->clock),
+         *                    scd->tick_gtod + TICK_NSEC);
          */
 
         clock = scd->tick_gtod + delta;
         min_clock = wrap_max(scd->tick_gtod, scd->clock);
-        max_clock = wrap_max(scd->clock, scd->tick_gtod + TICK_NSEC);
+        max_clock = scd->tick_gtod + TICK_NSEC;
 
         clock = wrap_max(clock, min_clock);
         clock = wrap_min(clock, max_clock);
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 26ed8e3d1c15..4293cfa9681d 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -53,6 +53,40 @@ static unsigned long nsec_low(unsigned long long nsec)
 
 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
 
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static void print_cfs_group_stats(struct seq_file *m, int cpu,
+                struct task_group *tg)
+{
+        struct sched_entity *se = tg->se[cpu];
+        if (!se)
+                return;
+
+#define P(F) \
+        SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)F)
+#define PN(F) \
+        SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
+
+        PN(se->exec_start);
+        PN(se->vruntime);
+        PN(se->sum_exec_runtime);
+#ifdef CONFIG_SCHEDSTATS
+        PN(se->wait_start);
+        PN(se->sleep_start);
+        PN(se->block_start);
+        PN(se->sleep_max);
+        PN(se->block_max);
+        PN(se->exec_max);
+        PN(se->slice_max);
+        PN(se->wait_max);
+        PN(se->wait_sum);
+        P(se->wait_count);
+#endif
+        P(se->load.weight);
+#undef PN
+#undef P
+}
+#endif
+
 static void
 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 {
@@ -121,20 +155,19 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
         char path[128] = "";
-        struct cgroup *cgroup = NULL;
         struct task_group *tg = cfs_rq->tg;
 
-        if (tg)
-                cgroup = tg->css.cgroup;
-
-        if (cgroup)
-                cgroup_path(cgroup, path, sizeof(path));
+        cgroup_path(tg->css.cgroup, path, sizeof(path));
 
         SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
+#elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
+        {
+                uid_t uid = cfs_rq->tg->uid;
+                SEQ_printf(m, "\ncfs_rq[%d] for UID: %u\n", cpu, uid);
+        }
 #else
         SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 #endif
-
         SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
                         SPLIT_NS(cfs_rq->exec_clock));
 
@@ -168,6 +201,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 #ifdef CONFIG_SMP
         SEQ_printf(m, "  .%-30s: %lu\n", "shares", cfs_rq->shares);
 #endif
+        print_cfs_group_stats(m, cpu, cfs_rq->tg);
 #endif
 }
 
@@ -175,14 +209,9 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 {
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
         char path[128] = "";
-        struct cgroup *cgroup = NULL;
         struct task_group *tg = rt_rq->tg;
 
-        if (tg)
-                cgroup = tg->css.cgroup;
-
-        if (cgroup)
-                cgroup_path(cgroup, path, sizeof(path));
+        cgroup_path(tg->css.cgroup, path, sizeof(path));
 
         SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
 #else
@@ -272,7 +301,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
         u64 now = ktime_to_ns(ktime_get());
         int cpu;
 
-        SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n",
+        SEQ_printf(m, "Sched Debug Version: v0.08, %s %.*s\n",
                 init_utsname()->release,
                 (int)strcspn(init_utsname()->version, " "),
                 init_utsname()->version);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 98345e45b059..5ad4440f0fc4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -492,6 +492,8 @@ static void update_curr(struct cfs_rq *cfs_rq)
          * overflow on 32 bits):
          */
         delta_exec = (unsigned long)(now - curr->exec_start);
+        if (!delta_exec)
+                return;
 
         __update_curr(cfs_rq, curr, delta_exec);
         curr->exec_start = now;
@@ -1345,12 +1347,11 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
 {
         struct task_struct *curr = rq->curr;
         struct sched_entity *se = &curr->se, *pse = &p->se;
+        struct cfs_rq *cfs_rq = task_cfs_rq(curr);
 
-        if (unlikely(rt_prio(p->prio))) {
-                struct cfs_rq *cfs_rq = task_cfs_rq(curr);
+        update_curr(cfs_rq);
 
-                update_rq_clock(rq);
-                update_curr(cfs_rq);
+        if (unlikely(rt_prio(p->prio))) {
                 resched_task(curr);
                 return;
         }
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index d9ba9d5f99d6..51d2af3e6191 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -77,7 +77,7 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
 }
 
 #define for_each_leaf_rt_rq(rt_rq, rq) \
-        list_for_each_entry(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
+        list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
 
 static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
 {
@@ -537,13 +537,13 @@ static void update_curr_rt(struct rq *rq)
         for_each_sched_rt_entity(rt_se) {
                 rt_rq = rt_rq_of_se(rt_se);
 
-                spin_lock(&rt_rq->rt_runtime_lock);
                 if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
+                        spin_lock(&rt_rq->rt_runtime_lock);
                         rt_rq->rt_time += delta_exec;
                         if (sched_rt_runtime_exceeded(rt_rq))
                                 resched_task(curr);
+                        spin_unlock(&rt_rq->rt_runtime_lock);
                 }
-                spin_unlock(&rt_rq->rt_runtime_lock);
         }
 }
 
@@ -909,9 +909,6 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 /* Only try algorithms three times */
 #define RT_MAX_TRIES 3
 
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest);
-static void double_unlock_balance(struct rq *this_rq, struct rq *busiest);
-
 static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
 
 static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 7dbf72a2b02c..3b01098164c8 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -31,7 +31,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
                     rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
                     rq->sched_switch, rq->sched_count, rq->sched_goidle,
                     rq->ttwu_count, rq->ttwu_local,
-                    rq->rq_sched_info.cpu_time,
+                    rq->rq_cpu_time,
                     rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
 
                 seq_printf(seq, "\n");
@@ -123,7 +123,7 @@ static inline void
 rq_sched_info_depart(struct rq *rq, unsigned long long delta)
 {
         if (rq)
-                rq->rq_sched_info.cpu_time += delta;
+                rq->rq_cpu_time += delta;
 }
 
 static inline void
@@ -236,7 +236,6 @@ static inline void sched_info_depart(struct task_struct *t)
         unsigned long long delta = task_rq(t)->clock -
                                         t->sched_info.last_arrival;
 
-        t->sched_info.cpu_time += delta;
         rq_sched_info_depart(task_rq(t), delta);
 
         if (t->state == TASK_RUNNING)
diff --git a/kernel/signal.c b/kernel/signal.c
index 4530fc654455..8e95855ff3cf 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -41,6 +41,8 @@
 
 static struct kmem_cache *sigqueue_cachep;
 
+DEFINE_TRACE(sched_signal_send);
+
 static void __user *sig_handler(struct task_struct *t, int sig)
 {
         return t->sighand->action[sig - 1].sa.sa_handler;
@@ -177,6 +179,11 @@ int next_signal(struct sigpending *pending, sigset_t *mask)
         return sig;
 }
 
+/*
+ * allocate a new signal queue record
+ * - this may be called without locks if and only if t == current, otherwise an
+ *   appopriate lock must be held to stop the target task from exiting
+ */
 static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
                                          int override_rlimit)
 {
@@ -184,11 +191,12 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
         struct user_struct *user;
 
         /*
-         * In order to avoid problems with "switch_user()", we want to make
-         * sure that the compiler doesn't re-load "t->user"
+         * We won't get problems with the target's UID changing under us
+         * because changing it requires RCU be used, and if t != current, the
+         * caller must be holding the RCU readlock (by way of a spinlock) and
+         * we use RCU protection here
          */
-        user = t->user;
-        barrier();
+        user = get_uid(__task_cred(t)->user);
         atomic_inc(&user->sigpending);
         if (override_rlimit ||
             atomic_read(&user->sigpending) <=
@@ -196,12 +204,14 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
                 q = kmem_cache_alloc(sigqueue_cachep, flags);
         if (unlikely(q == NULL)) {
                 atomic_dec(&user->sigpending);
+                free_uid(user);
         } else {
                 INIT_LIST_HEAD(&q->list);
                 q->flags = 0;
-                q->user = get_uid(user);
+                q->user = user;
         }
-        return(q);
+
+        return q;
 }
 
 static void __sigqueue_free(struct sigqueue *q)
@@ -562,10 +572,12 @@ static int rm_from_queue(unsigned long mask, struct sigpending *s)
 
 /*
  * Bad permissions for sending the signal
+ * - the caller must hold at least the RCU read lock
  */
 static int check_kill_permission(int sig, struct siginfo *info,
                                  struct task_struct *t)
 {
+        const struct cred *cred = current_cred(), *tcred;
         struct pid *sid;
         int error;
 
@@ -579,8 +591,11 @@ static int check_kill_permission(int sig, struct siginfo *info,
         if (error)
                 return error;
 
-        if ((current->euid ^ t->suid) && (current->euid ^ t->uid) &&
-            (current->uid  ^ t->suid) && (current->uid  ^ t->uid) &&
+        tcred = __task_cred(t);
+        if ((cred->euid ^ tcred->suid) &&
+            (cred->euid ^ tcred->uid) &&
+            (cred->uid  ^ tcred->suid) &&
+            (cred->uid  ^ tcred->uid) &&
             !capable(CAP_KILL)) {
                 switch (sig) {
                 case SIGCONT:
@@ -844,7 +859,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
                         q->info.si_errno = 0;
                         q->info.si_code = SI_USER;
                         q->info.si_pid = task_pid_vnr(current);
-                        q->info.si_uid = current->uid;
+                        q->info.si_uid = current_uid();
                         break;
                 case (unsigned long) SEND_SIG_PRIV:
                         q->info.si_signo = sig;
@@ -1008,6 +1023,10 @@ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long
         return sighand;
 }
 
+/*
+ * send signal info to all the members of a group
+ * - the caller must hold the RCU read lock at least
+ */
 int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 {
         unsigned long flags;
@@ -1029,8 +1048,8 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 /*
  * __kill_pgrp_info() sends a signal to a process group: this is what the tty
  * control characters do (^C, ^Z etc)
+ * - the caller must hold at least a readlock on tasklist_lock
  */
-
 int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
 {
         struct task_struct *p = NULL;
@@ -1086,6 +1105,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
 {
         int ret = -EINVAL;
         struct task_struct *p;
+        const struct cred *pcred;
 
         if (!valid_signal(sig))
                 return ret;
@@ -1096,9 +1116,11 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
                 ret = -ESRCH;
                 goto out_unlock;
         }
-        if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
-            && (euid != p->suid) && (euid != p->uid)
-            && (uid != p->suid) && (uid != p->uid)) {
+        pcred = __task_cred(p);
+        if ((info == SEND_SIG_NOINFO ||
+             (!is_si_special(info) && SI_FROMUSER(info))) &&
+            euid != pcred->suid && euid != pcred->uid &&
+            uid  != pcred->suid && uid  != pcred->uid) {
                 ret = -EPERM;
                 goto out_unlock;
         }
@@ -1369,10 +1391,9 @@ int do_notify_parent(struct task_struct *tsk, int sig)
          */
         rcu_read_lock();
         info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+        info.si_uid = __task_cred(tsk)->uid;
         rcu_read_unlock();
 
-        info.si_uid = tsk->uid;
-
         thread_group_cputime(tsk, &cputime);
         info.si_utime = cputime_to_jiffies(cputime.utime);
         info.si_stime = cputime_to_jiffies(cputime.stime);
@@ -1440,10 +1461,9 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
          */
         rcu_read_lock();
         info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+        info.si_uid = __task_cred(tsk)->uid;
         rcu_read_unlock();
 
-        info.si_uid = tsk->uid;
-
         info.si_utime = cputime_to_clock_t(tsk->utime);
         info.si_stime = cputime_to_clock_t(tsk->stime);
 
@@ -1598,7 +1618,7 @@ void ptrace_notify(int exit_code)
         info.si_signo = SIGTRAP;
         info.si_code = exit_code;
         info.si_pid = task_pid_vnr(current);
-        info.si_uid = current->uid;
+        info.si_uid = current_uid();
 
         /* Let the debugger run.  */
         spin_lock_irq(&current->sighand->siglock);
@@ -1710,7 +1730,7 @@ static int ptrace_signal(int signr, siginfo_t *info,
                 info->si_errno = 0;
                 info->si_code = SI_USER;
                 info->si_pid = task_pid_vnr(current->parent);
-                info->si_uid = current->parent->uid;
+                info->si_uid = task_uid(current->parent);
         }
 
         /* If the (new) signal is now blocked, requeue it.  */
@@ -2211,7 +2231,7 @@ sys_kill(pid_t pid, int sig)
         info.si_errno = 0;
         info.si_code = SI_USER;
         info.si_pid = task_tgid_vnr(current);
-        info.si_uid = current->uid;
+        info.si_uid = current_uid();
 
         return kill_something_info(sig, &info, pid);
 }
@@ -2228,7 +2248,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
         info.si_errno = 0;
         info.si_code = SI_TKILL;
         info.si_pid = task_tgid_vnr(current);
-        info.si_uid = current->uid;
+        info.si_uid = current_uid();
 
         rcu_read_lock();
         p = find_task_by_vpid(pid);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index e7c69a720d69..466e75ce271a 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -102,20 +102,6 @@ void local_bh_disable(void)
 
 EXPORT_SYMBOL(local_bh_disable);
 
-void __local_bh_enable(void)
-{
-        WARN_ON_ONCE(in_irq());
-
-        /*
-         * softirqs should never be enabled by __local_bh_enable(),
-         * it always nests inside local_bh_enable() sections:
-         */
-        WARN_ON_ONCE(softirq_count() == SOFTIRQ_OFFSET);
-
-        sub_preempt_count(SOFTIRQ_OFFSET);
-}
-EXPORT_SYMBOL_GPL(__local_bh_enable);
-
 /*
  * Special-case - softirqs can safely be enabled in
  * cond_resched_softirq(), or by __do_softirq(),
@@ -269,6 +255,7 @@ void irq_enter(void)
 {
         int cpu = smp_processor_id();
 
+        rcu_irq_enter();
         if (idle_cpu(cpu) && !in_interrupt()) {
                 __irq_enter();
                 tick_check_idle(cpu);
@@ -295,9 +282,9 @@ void irq_exit(void)
 
 #ifdef CONFIG_NO_HZ
         /* Make sure that timer wheel updates are propagated */
-        if (!in_interrupt() && idle_cpu(smp_processor_id()) && !need_resched())
-                tick_nohz_stop_sched_tick(0);
         rcu_irq_exit();
+        if (idle_cpu(smp_processor_id()) && !in_interrupt() && !need_resched())
+                tick_nohz_stop_sched_tick(0);
 #endif
         preempt_enable_no_resched();
 }
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 3953e4aed733..1ab790c67b17 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -164,7 +164,7 @@ unsigned long __read_mostly sysctl_hung_task_check_count = 1024;
 /*
  * Zero means infinite timeout - no checking done:
  */
-unsigned long __read_mostly sysctl_hung_task_timeout_secs = 120;
+unsigned long __read_mostly sysctl_hung_task_timeout_secs = 480;
 
 unsigned long __read_mostly sysctl_hung_task_warnings = 10;
 
@@ -188,7 +188,7 @@ static void check_hung_task(struct task_struct *t, unsigned long now)
         if ((long)(now - t->last_switch_timestamp) <
                                         sysctl_hung_task_timeout_secs)
                 return;
-        if (sysctl_hung_task_warnings < 0)
+        if (!sysctl_hung_task_warnings)
                 return;
         sysctl_hung_task_warnings--;
 
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index 94b527ef1d1e..eb212f8f8bc8 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -6,6 +6,7 @@
  *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  */
 #include <linux/sched.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
 #include <linux/stacktrace.h>
@@ -24,3 +25,13 @@ void print_stack_trace(struct stack_trace *trace, int spaces)
 }
 EXPORT_SYMBOL_GPL(print_stack_trace);
 
+/*
+ * Architectures that do not implement save_stack_trace_tsk get this
+ * weak alias and a once-per-bootup warning (whenever this facility
+ * is utilized - for example by procfs):
+ */
+__weak void
+save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+        WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
+}
diff --git a/kernel/sys.c b/kernel/sys.c
index 31deba8f7d16..d356d79e84ac 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -112,12 +112,17 @@ EXPORT_SYMBOL(cad_pid);
 
 void (*pm_power_off_prepare)(void);
 
+/*
+ * set the priority of a task
+ * - the caller must hold the RCU read lock
+ */
 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {
+        const struct cred *cred = current_cred(), *pcred = __task_cred(p);
         int no_nice;
 
-        if (p->uid != current->euid &&
-                p->euid != current->euid && !capable(CAP_SYS_NICE)) {
+        if (pcred->uid  != cred->euid &&
+            pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) {
                 error = -EPERM;
                 goto out;
         }
@@ -141,6 +146,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
 {
         struct task_struct *g, *p;
         struct user_struct *user;
+        const struct cred *cred = current_cred();
         int error = -EINVAL;
         struct pid *pgrp;
 
@@ -174,18 +180,18 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
                         } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
                         break;
                 case PRIO_USER:
-                        user = current->user;
+                        user = (struct user_struct *) cred->user;
                         if (!who)
-                                who = current->uid;
-                        else
-                                if ((who != current->uid) && !(user = find_user(who)))
-                                        goto out_unlock;        /* No processes for this user */
+                                who = cred->uid;
+                        else if ((who != cred->uid) &&
+                                 !(user = find_user(who)))
+                                goto out_unlock;        /* No processes for this user */
 
                         do_each_thread(g, p)
-                                if (p->uid == who)
+                                if (__task_cred(p)->uid == who)
                                         error = set_one_prio(p, niceval, error);
                         while_each_thread(g, p);
-                        if (who != current->uid)
+                        if (who != cred->uid)
                                 free_uid(user);         /* For find_user() */
                         break;
         }
@@ -205,6 +211,7 @@ asmlinkage long sys_getpriority(int which, int who)
 {
         struct task_struct *g, *p;
         struct user_struct *user;
+        const struct cred *cred = current_cred();
         long niceval, retval = -ESRCH;
         struct pid *pgrp;
 
@@ -236,21 +243,21 @@ asmlinkage long sys_getpriority(int which, int who)
                         } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
                         break;
                 case PRIO_USER:
-                        user = current->user;
+                        user = (struct user_struct *) cred->user;
                         if (!who)
-                                who = current->uid;
-                        else
-                                if ((who != current->uid) && !(user = find_user(who)))
-                                        goto out_unlock;        /* No processes for this user */
+                                who = cred->uid;
+                        else if ((who != cred->uid) &&
+                                 !(user = find_user(who)))
+                                goto out_unlock;        /* No processes for this user */
 
                         do_each_thread(g, p)
-                                if (p->uid == who) {
+                                if (__task_cred(p)->uid == who) {
                                         niceval = 20 - task_nice(p);
                                         if (niceval > retval)
                                                 retval = niceval;
                                 }
                         while_each_thread(g, p);
-                        if (who != current->uid)
+                        if (who != cred->uid)
                                 free_uid(user);         /* for find_user() */
                         break;
         }
@@ -472,46 +479,48 @@ void ctrl_alt_del(void)
  */
 asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
 {
-        int old_rgid = current->gid;
-        int old_egid = current->egid;
-        int new_rgid = old_rgid;
-        int new_egid = old_egid;
+        const struct cred *old;
+        struct cred *new;
         int retval;
 
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+        old = current_cred();
+
         retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE);
         if (retval)
-                return retval;
+                goto error;
 
+        retval = -EPERM;
         if (rgid != (gid_t) -1) {
-                if ((old_rgid == rgid) ||
-                    (current->egid==rgid) ||
+                if (old->gid == rgid ||
+                    old->egid == rgid ||
                     capable(CAP_SETGID))
-                        new_rgid = rgid;
+                        new->gid = rgid;
                 else
-                        return -EPERM;
+                        goto error;
         }
         if (egid != (gid_t) -1) {
-                if ((old_rgid == egid) ||
-                    (current->egid == egid) ||
-                    (current->sgid == egid) ||
+                if (old->gid == egid ||
+                    old->egid == egid ||
+                    old->sgid == egid ||
                     capable(CAP_SETGID))
-                        new_egid = egid;
+                        new->egid = egid;
                 else
-                        return -EPERM;
-        }
-        if (new_egid != old_egid) {
-                set_dumpable(current->mm, suid_dumpable);
-                smp_wmb();
+                        goto error;
         }
+
         if (rgid != (gid_t) -1 ||
-            (egid != (gid_t) -1 && egid != old_rgid))
-                current->sgid = new_egid;
-        current->fsgid = new_egid;
-        current->egid = new_egid;
-        current->gid = new_rgid;
-        key_fsgid_changed(current);
-        proc_id_connector(current, PROC_EVENT_GID);
-        return 0;
+            (egid != (gid_t) -1 && egid != old->gid))
+                new->sgid = new->egid;
+        new->fsgid = new->egid;
+
+        return commit_creds(new);
+
+error:
+        abort_creds(new);
+        return retval;
 }
 
 /*
@@ -521,56 +530,54 @@ asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
  */
 asmlinkage long sys_setgid(gid_t gid)
 {
-        int old_egid = current->egid;
+        const struct cred *old;
+        struct cred *new;
         int retval;
 
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+        old = current_cred();
+
         retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID);
         if (retval)
-                return retval;
+                goto error;
 
-        if (capable(CAP_SETGID)) {
-                if (old_egid != gid) {
-                        set_dumpable(current->mm, suid_dumpable);
-                        smp_wmb();
-                }
-                current->gid = current->egid = current->sgid = current->fsgid = gid;
-        } else if ((gid == current->gid) || (gid == current->sgid)) {
-                if (old_egid != gid) {
-                        set_dumpable(current->mm, suid_dumpable);
-                        smp_wmb();
-                }
-                current->egid = current->fsgid = gid;
-        }
+        retval = -EPERM;
+        if (capable(CAP_SETGID))
+                new->gid = new->egid = new->sgid = new->fsgid = gid;
+        else if (gid == old->gid || gid == old->sgid)
+                new->egid = new->fsgid = gid;
         else
-                return -EPERM;
+                goto error;
 
-        key_fsgid_changed(current);
-        proc_id_connector(current, PROC_EVENT_GID);
-        return 0;
+        return commit_creds(new);
+
+error:
+        abort_creds(new);
+        return retval;
 }
   
-static int set_user(uid_t new_ruid, int dumpclear)
+/*
+ * change the user struct in a credentials set to match the new UID
+ */
+static int set_user(struct cred *new)
 {
         struct user_struct *new_user;
 
-        new_user = alloc_uid(current->nsproxy->user_ns, new_ruid);
+        new_user = alloc_uid(current_user_ns(), new->uid);
         if (!new_user)
                 return -EAGAIN;
 
         if (atomic_read(&new_user->processes) >=
                                 current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
-                        new_user != current->nsproxy->user_ns->root_user) {
+                        new_user != INIT_USER) {
                 free_uid(new_user);
                 return -EAGAIN;
         }
 
-        switch_uid(new_user);
-
-        if (dumpclear) {
-                set_dumpable(current->mm, suid_dumpable);
-                smp_wmb();
-        }
-        current->uid = new_ruid;
+        free_uid(new->user);
+        new->user = new_user;
         return 0;
 }
 
@@ -591,54 +598,56 @@ static int set_user(uid_t new_ruid, int dumpclear)
  */
 asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
 {
-        int old_ruid, old_euid, old_suid, new_ruid, new_euid;
+        const struct cred *old;
+        struct cred *new;
         int retval;
 
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+        old = current_cred();
+
         retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE);
         if (retval)
-                return retval;
-
-        new_ruid = old_ruid = current->uid;
-        new_euid = old_euid = current->euid;
-        old_suid = current->suid;
+                goto error;
 
+        retval = -EPERM;
         if (ruid != (uid_t) -1) {
-                new_ruid = ruid;
-                if ((old_ruid != ruid) &&
-                    (current->euid != ruid) &&
+                new->uid = ruid;
+                if (old->uid != ruid &&
+                    old->euid != ruid &&
                     !capable(CAP_SETUID))
-                        return -EPERM;
+                        goto error;
         }
 
         if (euid != (uid_t) -1) {
-                new_euid = euid;
-                if ((old_ruid != euid) &&
-                    (current->euid != euid) &&
-                    (current->suid != euid) &&
+                new->euid = euid;
+                if (old->uid != euid &&
+                    old->euid != euid &&
+                    old->suid != euid &&
                     !capable(CAP_SETUID))
-                        return -EPERM;
+                        goto error;
         }
 
-        if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0)
-                return -EAGAIN;
+        retval = -EAGAIN;
+        if (new->uid != old->uid && set_user(new) < 0)
+                goto error;
 
-        if (new_euid != old_euid) {
-                set_dumpable(current->mm, suid_dumpable);
-                smp_wmb();
-        }
-        current->fsuid = current->euid = new_euid;
         if (ruid != (uid_t) -1 ||
-            (euid != (uid_t) -1 && euid != old_ruid))
-                current->suid = current->euid;
-        current->fsuid = current->euid;
+            (euid != (uid_t) -1 && euid != old->uid))
+                new->suid = new->euid;
+        new->fsuid = new->euid;
 
-        key_fsuid_changed(current);
-        proc_id_connector(current, PROC_EVENT_UID);
-
-        return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE);
-}
+        retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
+        if (retval < 0)
+                goto error;
 
+        return commit_creds(new);
 
+error:
+        abort_creds(new);
+        return retval;
+}
                 
 /*
  * setuid() is implemented like SysV with SAVED_IDS 
@@ -653,36 +662,41 @@ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
  */
 asmlinkage long sys_setuid(uid_t uid)
 {
-        int old_euid = current->euid;
-        int old_ruid, old_suid, new_suid;
+        const struct cred *old;
+        struct cred *new;
         int retval;
 
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+        old = current_cred();
+
         retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID);
         if (retval)
-                return retval;
+                goto error;
 
-        old_ruid = current->uid;
-        old_suid = current->suid;
-        new_suid = old_suid;
-        
+        retval = -EPERM;
         if (capable(CAP_SETUID)) {
-                if (uid != old_ruid && set_user(uid, old_euid != uid) < 0)
-                        return -EAGAIN;
-                new_suid = uid;
-        } else if ((uid != current->uid) && (uid != new_suid))
-                return -EPERM;
-
-        if (old_euid != uid) {
-                set_dumpable(current->mm, suid_dumpable);
-                smp_wmb();
+                new->suid = new->uid = uid;
+                if (uid != old->uid && set_user(new) < 0) {
+                        retval = -EAGAIN;
+                        goto error;
+                }
+        } else if (uid != old->uid && uid != new->suid) {
+                goto error;
         }
-        current->fsuid = current->euid = uid;
-        current->suid = new_suid;
 
-        key_fsuid_changed(current);
-        proc_id_connector(current, PROC_EVENT_UID);
+        new->fsuid = new->euid = uid;
+
+        retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
+        if (retval < 0)
+                goto error;
 
-        return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID);
+        return commit_creds(new);
+
+error:
+        abort_creds(new);
+        return retval;
 }
 
 
@@ -692,54 +706,63 @@ asmlinkage long sys_setuid(uid_t uid)
  */
 asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 {
-        int old_ruid = current->uid;
-        int old_euid = current->euid;
-        int old_suid = current->suid;
+        const struct cred *old;
+        struct cred *new;
         int retval;
 
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+
         retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES);
         if (retval)
-                return retval;
+                goto error;
+        old = current_cred();
 
+        retval = -EPERM;
         if (!capable(CAP_SETUID)) {
-                if ((ruid != (uid_t) -1) && (ruid != current->uid) &&
-                    (ruid != current->euid) && (ruid != current->suid))
-                        return -EPERM;
-                if ((euid != (uid_t) -1) && (euid != current->uid) &&
-                    (euid != current->euid) && (euid != current->suid))
-                        return -EPERM;
-                if ((suid != (uid_t) -1) && (suid != current->uid) &&
-                    (suid != current->euid) && (suid != current->suid))
-                        return -EPERM;
+                if (ruid != (uid_t) -1 && ruid != old->uid &&
+                    ruid != old->euid  && ruid != old->suid)
+                        goto error;
+                if (euid != (uid_t) -1 && euid != old->uid &&
+                    euid != old->euid  && euid != old->suid)
+                        goto error;
+                if (suid != (uid_t) -1 && suid != old->uid &&
+                    suid != old->euid  && suid != old->suid)
+                        goto error;
         }
+
+        retval = -EAGAIN;
         if (ruid != (uid_t) -1) {
-                if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0)
-                        return -EAGAIN;
+                new->uid = ruid;
+                if (ruid != old->uid && set_user(new) < 0)
+                        goto error;
         }
-        if (euid != (uid_t) -1) {
-                if (euid != current->euid) {
-                        set_dumpable(current->mm, suid_dumpable);
-                        smp_wmb();
-                }
-                current->euid = euid;
-        }
-        current->fsuid = current->euid;
+        if (euid != (uid_t) -1)
+                new->euid = euid;
         if (suid != (uid_t) -1)
-                current->suid = suid;
+                new->suid = suid;
+        new->fsuid = new->euid;
+
+        retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
+        if (retval < 0)
+                goto error;
 
-        key_fsuid_changed(current);
-        proc_id_connector(current, PROC_EVENT_UID);
+        return commit_creds(new);
 
-        return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES);
+error:
+        abort_creds(new);
+        return retval;
 }
 
 asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid)
 {
+        const struct cred *cred = current_cred();
         int retval;
 
-        if (!(retval = put_user(current->uid, ruid)) &&
-            !(retval = put_user(current->euid, euid)))
-                retval = put_user(current->suid, suid);
+        if (!(retval   = put_user(cred->uid,  ruid)) &&
+            !(retval   = put_user(cred->euid, euid)))
+                retval = put_user(cred->suid, suid);
 
         return retval;
 }
@@ -749,48 +772,55 @@ asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __us
  */
 asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 {
+        const struct cred *old;
+        struct cred *new;
         int retval;
 
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+        old = current_cred();
+
         retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES);
         if (retval)
-                return retval;
+                goto error;
 
+        retval = -EPERM;
         if (!capable(CAP_SETGID)) {
-                if ((rgid != (gid_t) -1) && (rgid != current->gid) &&
-                    (rgid != current->egid) && (rgid != current->sgid))
-                        return -EPERM;
-                if ((egid != (gid_t) -1) && (egid != current->gid) &&
-                    (egid != current->egid) && (egid != current->sgid))
-                        return -EPERM;
-                if ((sgid != (gid_t) -1) && (sgid != current->gid) &&
-                    (sgid != current->egid) && (sgid != current->sgid))
-                        return -EPERM;
-        }
-        if (egid != (gid_t) -1) {
-                if (egid != current->egid) {
-                        set_dumpable(current->mm, suid_dumpable);
-                        smp_wmb();
-                }
-                current->egid = egid;
+                if (rgid != (gid_t) -1 && rgid != old->gid &&
+                    rgid != old->egid  && rgid != old->sgid)
+                        goto error;
+                if (egid != (gid_t) -1 && egid != old->gid &&
+                    egid != old->egid  && egid != old->sgid)
+                        goto error;
+                if (sgid != (gid_t) -1 && sgid != old->gid &&
+                    sgid != old->egid  && sgid != old->sgid)
+                        goto error;
         }
-        current->fsgid = current->egid;
+
         if (rgid != (gid_t) -1)
-                current->gid = rgid;
+                new->gid = rgid;
+        if (egid != (gid_t) -1)
+                new->egid = egid;
         if (sgid != (gid_t) -1)
-                current->sgid = sgid;
+                new->sgid = sgid;
+        new->fsgid = new->egid;
 
-        key_fsgid_changed(current);
-        proc_id_connector(current, PROC_EVENT_GID);
-        return 0;
+        return commit_creds(new);
+
+error:
+        abort_creds(new);
+        return retval;
 }
 
 asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid)
 {
+        const struct cred *cred = current_cred();
         int retval;
 
-        if (!(retval = put_user(current->gid, rgid)) &&
-            !(retval = put_user(current->egid, egid)))
-                retval = put_user(current->sgid, sgid);
+        if (!(retval   = put_user(cred->gid,  rgid)) &&
+            !(retval   = put_user(cred->egid, egid)))
+                retval = put_user(cred->sgid, sgid);
 
         return retval;
 }
@@ -804,27 +834,35 @@ asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __us
  */
 asmlinkage long sys_setfsuid(uid_t uid)
 {
-        int old_fsuid;
+        const struct cred *old;
+        struct cred *new;
+        uid_t old_fsuid;
+
+        new = prepare_creds();
+        if (!new)
+                return current_fsuid();
+        old = current_cred();
+        old_fsuid = old->fsuid;
 
-        old_fsuid = current->fsuid;
-        if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS))
-                return old_fsuid;
+        if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0)
+                goto error;
 
-        if (uid == current->uid || uid == current->euid ||
-            uid == current->suid || uid == current->fsuid || 
+        if (uid == old->uid  || uid == old->euid  ||
+            uid == old->suid || uid == old->fsuid ||
             capable(CAP_SETUID)) {
                 if (uid != old_fsuid) {
-                        set_dumpable(current->mm, suid_dumpable);
-                        smp_wmb();
+                        new->fsuid = uid;
+                        if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
+                                goto change_okay;
                 }
-                current->fsuid = uid;
         }
 
-        key_fsuid_changed(current);
-        proc_id_connector(current, PROC_EVENT_UID);
-
-        security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
+error:
+        abort_creds(new);
+        return old_fsuid;
 
+change_okay:
+        commit_creds(new);
         return old_fsuid;
 }
 
@@ -833,23 +871,34 @@ asmlinkage long sys_setfsuid(uid_t uid)
  */
 asmlinkage long sys_setfsgid(gid_t gid)
 {
-        int old_fsgid;
+        const struct cred *old;
+        struct cred *new;
+        gid_t old_fsgid;
+
+        new = prepare_creds();
+        if (!new)
+                return current_fsgid();
+        old = current_cred();
+        old_fsgid = old->fsgid;
 
-        old_fsgid = current->fsgid;
         if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS))
-                return old_fsgid;
+                goto error;
 
-        if (gid == current->gid || gid == current->egid ||
-            gid == current->sgid || gid == current->fsgid || 
+        if (gid == old->gid  || gid == old->egid  ||
+            gid == old->sgid || gid == old->fsgid ||
             capable(CAP_SETGID)) {
                 if (gid != old_fsgid) {
-                        set_dumpable(current->mm, suid_dumpable);
-                        smp_wmb();
+                        new->fsgid = gid;
+                        goto change_okay;
                 }
-                current->fsgid = gid;
-                key_fsgid_changed(current);
-                proc_id_connector(current, PROC_EVENT_GID);
         }
+
+error:
+        abort_creds(new);
+        return old_fsgid;
+
+change_okay:
+        commit_creds(new);
         return old_fsgid;
 }
 
@@ -858,8 +907,8 @@ void do_sys_times(struct tms *tms)
         struct task_cputime cputime;
         cputime_t cutime, cstime;
 
-        spin_lock_irq(&current->sighand->siglock);
         thread_group_cputime(current, &cputime);
+        spin_lock_irq(&current->sighand->siglock);
         cutime = current->signal->cutime;
         cstime = current->signal->cstime;
         spin_unlock_irq(&current->sighand->siglock);
@@ -1118,7 +1167,7 @@ EXPORT_SYMBOL(groups_free);
 
 /* export the group_info to a user-space array */
 static int groups_to_user(gid_t __user *grouplist,
-    struct group_info *group_info)
+                          const struct group_info *group_info)
 {
         int i;
         unsigned int count = group_info->ngroups;
@@ -1186,7 +1235,7 @@ static void groups_sort(struct group_info *group_info)
 }
 
 /* a simple bsearch */
-int groups_search(struct group_info *group_info, gid_t grp)
+int groups_search(const struct group_info *group_info, gid_t grp)
 {
         unsigned int left, right;
 
@@ -1208,51 +1257,74 @@ int groups_search(struct group_info *group_info, gid_t grp)
         return 0;
 }
 
-/* validate and set current->group_info */
-int set_current_groups(struct group_info *group_info)
+/**
+ * set_groups - Change a group subscription in a set of credentials
+ * @new: The newly prepared set of credentials to alter
+ * @group_info: The group list to install
+ *
+ * Validate a group subscription and, if valid, insert it into a set
+ * of credentials.
+ */
+int set_groups(struct cred *new, struct group_info *group_info)
 {
         int retval;
-        struct group_info *old_info;
 
         retval = security_task_setgroups(group_info);
         if (retval)
                 return retval;
 
+        put_group_info(new->group_info);
         groups_sort(group_info);
         get_group_info(group_info);
+        new->group_info = group_info;
+        return 0;
+}
 
-        task_lock(current);
-        old_info = current->group_info;
-        current->group_info = group_info;
-        task_unlock(current);
+EXPORT_SYMBOL(set_groups);
 
-        put_group_info(old_info);
+/**
+ * set_current_groups - Change current's group subscription
+ * @group_info: The group list to impose
+ *
+ * Validate a group subscription and, if valid, impose it upon current's task
+ * security record.
+ */
+int set_current_groups(struct group_info *group_info)
+{
+        struct cred *new;
+        int ret;
 
-        return 0;
+        new = prepare_creds();
+        if (!new)
+                return -ENOMEM;
+
+        ret = set_groups(new, group_info);
+        if (ret < 0) {
+                abort_creds(new);
+                return ret;
+        }
+
+        return commit_creds(new);
 }
 
 EXPORT_SYMBOL(set_current_groups);
 
 asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist)
 {
-        int i = 0;
-
-        /*
-         *      SMP: Nobody else can change our grouplist. Thus we are
-         *      safe.
-         */
+        const struct cred *cred = current_cred();
+        int i;
 
         if (gidsetsize < 0)
                 return -EINVAL;
 
         /* no need to grab task_lock here; it cannot change */
-        i = current->group_info->ngroups;
+        i = cred->group_info->ngroups;
         if (gidsetsize) {
                 if (i > gidsetsize) {
                         i = -EINVAL;
                         goto out;
                 }
-                if (groups_to_user(grouplist, current->group_info)) {
+                if (groups_to_user(grouplist, cred->group_info)) {
                         i = -EFAULT;
                         goto out;
                 }
@@ -1296,9 +1368,11 @@ asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist)
  */
 int in_group_p(gid_t grp)
 {
+        const struct cred *cred = current_cred();
         int retval = 1;
-        if (grp != current->fsgid)
-                retval = groups_search(current->group_info, grp);
+
+        if (grp != cred->fsgid)
+                retval = groups_search(cred->group_info, grp);
         return retval;
 }
 
@@ -1306,9 +1380,11 @@ EXPORT_SYMBOL(in_group_p);
 
 int in_egroup_p(gid_t grp)
 {
+        const struct cred *cred = current_cred();
         int retval = 1;
-        if (grp != current->egid)
-                retval = groups_search(current->group_info, grp);
+
+        if (grp != cred->egid)
+                retval = groups_search(cred->group_info, grp);
         return retval;
 }
 
@@ -1624,50 +1700,56 @@ asmlinkage long sys_umask(int mask)
 asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                           unsigned long arg4, unsigned long arg5)
 {
-        long error = 0;
+        struct task_struct *me = current;
+        unsigned char comm[sizeof(me->comm)];
+        long error;
 
-        if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
+        error = security_task_prctl(option, arg2, arg3, arg4, arg5);
+        if (error != -ENOSYS)
                 return error;
 
+        error = 0;
         switch (option) {
                 case PR_SET_PDEATHSIG:
                         if (!valid_signal(arg2)) {
                                 error = -EINVAL;
                                 break;
                         }
-                        current->pdeath_signal = arg2;
+                        me->pdeath_signal = arg2;
+                        error = 0;
                         break;
                 case PR_GET_PDEATHSIG:
-                        error = put_user(current->pdeath_signal, (int __user *)arg2);
+                        error = put_user(me->pdeath_signal, (int __user *)arg2);
                         break;
                 case PR_GET_DUMPABLE:
-                        error = get_dumpable(current->mm);
+                        error = get_dumpable(me->mm);
                         break;
                 case PR_SET_DUMPABLE:
                         if (arg2 < 0 || arg2 > 1) {
                                 error = -EINVAL;
                                 break;
                         }
-                        set_dumpable(current->mm, arg2);
+                        set_dumpable(me->mm, arg2);
+                        error = 0;
                         break;
 
                 case PR_SET_UNALIGN:
-                        error = SET_UNALIGN_CTL(current, arg2);
+                        error = SET_UNALIGN_CTL(me, arg2);
                         break;
                 case PR_GET_UNALIGN:
-                        error = GET_UNALIGN_CTL(current, arg2);
+                        error = GET_UNALIGN_CTL(me, arg2);
                         break;
                 case PR_SET_FPEMU:
-                        error = SET_FPEMU_CTL(current, arg2);
+                        error = SET_FPEMU_CTL(me, arg2);
                         break;
                 case PR_GET_FPEMU:
-                        error = GET_FPEMU_CTL(current, arg2);
+                        error = GET_FPEMU_CTL(me, arg2);
                         break;
                 case PR_SET_FPEXC:
-                        error = SET_FPEXC_CTL(current, arg2);
+                        error = SET_FPEXC_CTL(me, arg2);
                         break;
                 case PR_GET_FPEXC:
-                        error = GET_FPEXC_CTL(current, arg2);
+                        error = GET_FPEXC_CTL(me, arg2);
                         break;
                 case PR_GET_TIMING:
                         error = PR_TIMING_STATISTICAL;
@@ -1675,33 +1757,28 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                 case PR_SET_TIMING:
                         if (arg2 != PR_TIMING_STATISTICAL)
                                 error = -EINVAL;
+                        else
+                                error = 0;
                         break;
 
-                case PR_SET_NAME: {
-                        struct task_struct *me = current;
-                        unsigned char ncomm[sizeof(me->comm)];
-
-                        ncomm[sizeof(me->comm)-1] = 0;
-                        if (strncpy_from_user(ncomm, (char __user *)arg2,
-                                                sizeof(me->comm)-1) < 0)
+                case PR_SET_NAME:
+                        comm[sizeof(me->comm)-1] = 0;
+                        if (strncpy_from_user(comm, (char __user *)arg2,
+                                              sizeof(me->comm) - 1) < 0)
                                 return -EFAULT;
-                        set_task_comm(me, ncomm);
+                        set_task_comm(me, comm);
                         return 0;
-                }
-                case PR_GET_NAME: {
-                        struct task_struct *me = current;
-                        unsigned char tcomm[sizeof(me->comm)];
-
-                        get_task_comm(tcomm, me);
-                        if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm)))
+                case PR_GET_NAME:
+                        get_task_comm(comm, me);
+                        if (copy_to_user((char __user *)arg2, comm,
+                                         sizeof(comm)))
                                 return -EFAULT;
                         return 0;
-                }
                 case PR_GET_ENDIAN:
-                        error = GET_ENDIAN(current, arg2);
+                        error = GET_ENDIAN(me, arg2);
                         break;
                 case PR_SET_ENDIAN:
-                        error = SET_ENDIAN(current, arg2);
+                        error = SET_ENDIAN(me, arg2);
                         break;
 
                 case PR_GET_SECCOMP:
@@ -1725,6 +1802,7 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                                         current->default_timer_slack_ns;
                         else
                                 current->timer_slack_ns = arg2;
+                        error = 0;
                         break;
                 default:
                         error = -EINVAL;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 3d56fe7570da..ff6d45c7626f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -121,6 +121,10 @@ extern int sg_big_buff;
 #include <asm/system.h>
 #endif
 
+#ifdef CONFIG_SPARC64
+extern int sysctl_tsb_ratio;
+#endif
+
 #ifdef __hppa__
 extern int pwrsw_enabled;
 extern int unaligned_enabled;
@@ -451,6 +455,16 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = &proc_dointvec,
         },
 #endif
+#ifdef CONFIG_SPARC64
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "tsb-ratio",
+                .data           = &sysctl_tsb_ratio,
+                .maxlen         = sizeof (int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+#endif
 #ifdef __hppa__
         {
                 .ctl_name       = KERN_HPPA_PWRSW,
@@ -487,6 +501,26 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = &ftrace_enable_sysctl,
         },
 #endif
+#ifdef CONFIG_STACK_TRACER
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "stack_tracer_enabled",
+                .data           = &stack_tracer_enabled,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &stack_trace_sysctl,
+        },
+#endif
+#ifdef CONFIG_TRACING
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "ftrace_dump_on_oops",
+                .data           = &ftrace_dump_on_oops,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+#endif
 #ifdef CONFIG_MODULES
         {
                 .ctl_name       = KERN_MODPROBE,
@@ -1651,7 +1685,7 @@ out:
 
 static int test_perm(int mode, int op)
 {
-        if (!current->euid)
+        if (!current_euid())
                 mode >>= 6;
         else if (in_egroup_p(0))
                 mode >>= 3;
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 8ff15e5d486b..f5f793d92415 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -131,7 +131,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
 {
         enum hrtimer_restart res = HRTIMER_NORESTART;
 
-        write_seqlock_irq(&xtime_lock);
+        write_seqlock(&xtime_lock);
 
         switch (time_state) {
         case TIME_OK:
@@ -164,7 +164,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
         }
         update_vsyscall(&xtime, clock);
 
-        write_sequnlock_irq(&xtime_lock);
+        write_sequnlock(&xtime_lock);
 
         return res;
 }
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 342fc9ccab46..8f3fc2582d38 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -247,7 +247,7 @@ void tick_nohz_stop_sched_tick(int inidle)
         if (need_resched())
                 goto end;
 
-        if (unlikely(local_softirq_pending())) {
+        if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
                 static int ratelimit;
 
                 if (ratelimit < 10) {
@@ -282,8 +282,31 @@ void tick_nohz_stop_sched_tick(int inidle)
         /* Schedule the tick, if we are at least one jiffie off */
         if ((long)delta_jiffies >= 1) {
 
+                /*
+                * calculate the expiry time for the next timer wheel
+                * timer
+                */
+                expires = ktime_add_ns(last_update, tick_period.tv64 *
+                                   delta_jiffies);
+
+                /*
+                 * If this cpu is the one which updates jiffies, then
+                 * give up the assignment and let it be taken by the
+                 * cpu which runs the tick timer next, which might be
+                 * this cpu as well. If we don't drop this here the
+                 * jiffies might be stale and do_timer() never
+                 * invoked.
+                 */
+                if (cpu == tick_do_timer_cpu)
+                        tick_do_timer_cpu = TICK_DO_TIMER_NONE;
+
                 if (delta_jiffies > 1)
                         cpu_set(cpu, nohz_cpu_mask);
+
+                /* Skip reprogram of event if its not changed */
+                if (ts->tick_stopped && ktime_equal(expires, dev->next_event))
+                        goto out;
+
                 /*
                  * nohz_stop_sched_tick can be called several times before
                  * the nohz_restart_sched_tick is called. This happens when
@@ -306,17 +329,6 @@ void tick_nohz_stop_sched_tick(int inidle)
                         rcu_enter_nohz();
                 }
 
-                /*
-                 * If this cpu is the one which updates jiffies, then
-                 * give up the assignment and let it be taken by the
-                 * cpu which runs the tick timer next, which might be
-                 * this cpu as well. If we don't drop this here the
-                 * jiffies might be stale and do_timer() never
-                 * invoked.
-                 */
-                if (cpu == tick_do_timer_cpu)
-                        tick_do_timer_cpu = TICK_DO_TIMER_NONE;
-
                 ts->idle_sleeps++;
 
                 /*
@@ -332,12 +344,7 @@ void tick_nohz_stop_sched_tick(int inidle)
                         goto out;
                 }
 
-                /*
-                 * calculate the expiry time for the next timer wheel
-                 * timer
-                 */
-                expires = ktime_add_ns(last_update, tick_period.tv64 *
-                                       delta_jiffies);
+                /* Mark expiries */
                 ts->idle_expires = expires;
 
                 if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
@@ -681,7 +688,6 @@ void tick_setup_sched_timer(void)
          */
         hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
         ts->sched_timer.function = tick_sched_timer;
-        ts->sched_timer.cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
 
         /* Get the next period (per cpu) */
         hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index e7acfb482a68..fa05e88aa76f 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -518,6 +518,28 @@ void update_wall_time(void)
         /* correct the clock when NTP error is too big */
         clocksource_adjust(offset);
 
+        /*
+         * Since in the loop above, we accumulate any amount of time
+         * in xtime_nsec over a second into xtime.tv_sec, its possible for
+         * xtime_nsec to be fairly small after the loop. Further, if we're
+         * slightly speeding the clocksource up in clocksource_adjust(),
+         * its possible the required corrective factor to xtime_nsec could
+         * cause it to underflow.
+         *
+         * Now, we cannot simply roll the accumulated second back, since
+         * the NTP subsystem has been notified via second_overflow. So
+         * instead we push xtime_nsec forward by the amount we underflowed,
+         * and add that amount into the error.
+         *
+         * We'll correct this error next time through this function, when
+         * xtime_nsec is not as small.
+         */
+        if (unlikely((s64)clock->xtime_nsec < 0)) {
+                s64 neg = -(s64)clock->xtime_nsec;
+                clock->xtime_nsec = 0;
+                clock->error += neg << (NTP_SCALE_SHIFT - clock->shift);
+        }
+
         /* store full nanoseconds into xtime after rounding it up and
          * add the remainder to the error difference.
          */
diff --git a/kernel/timer.c b/kernel/timer.c
index dbd50fabe4c7..566257d1dc10 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1192,25 +1192,25 @@ asmlinkage long sys_getppid(void)
 asmlinkage long sys_getuid(void)
 {
         /* Only we change this so SMP safe */
-        return current->uid;
+        return current_uid();
 }
 
 asmlinkage long sys_geteuid(void)
 {
         /* Only we change this so SMP safe */
-        return current->euid;
+        return current_euid();
 }
 
 asmlinkage long sys_getgid(void)
 {
         /* Only we change this so SMP safe */
-        return current->gid;
+        return current_gid();
 }
 
 asmlinkage long sys_getegid(void)
 {
         /* Only we change this so SMP safe */
-        return  current->egid;
+        return  current_egid();
 }
 
 #endif
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 33dbefd471e8..e2a4ff6fc3a6 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -3,18 +3,34 @@
 #  select HAVE_FUNCTION_TRACER:
 #
 
+config USER_STACKTRACE_SUPPORT
+        bool
+
 config NOP_TRACER
         bool
 
 config HAVE_FUNCTION_TRACER
         bool
 
+config HAVE_FUNCTION_GRAPH_TRACER
+        bool
+
+config HAVE_FUNCTION_TRACE_MCOUNT_TEST
+        bool
+        help
+         This gets selected when the arch tests the function_trace_stop
+         variable at the mcount call site. Otherwise, this variable
+         is tested by the called function.
+
 config HAVE_DYNAMIC_FTRACE
         bool
 
 config HAVE_FTRACE_MCOUNT_RECORD
         bool
 
+config HAVE_HW_BRANCH_TRACER
+        bool
+
 config TRACER_MAX_TRACE
         bool
 
@@ -47,6 +63,20 @@ config FUNCTION_TRACER
           (the bootup default), then the overhead of the instructions is very
           small and not measurable even in micro-benchmarks.
 
+config FUNCTION_GRAPH_TRACER
+        bool "Kernel Function Graph Tracer"
+        depends on HAVE_FUNCTION_GRAPH_TRACER
+        depends on FUNCTION_TRACER
+        default y
+        help
+          Enable the kernel to trace a function at both its return
+          and its entry.
+          It's first purpose is to trace the duration of functions and
+          draw a call graph for each thread with some informations like
+          the return value.
+          This is done by setting the current return address on the current
+          task structure into a stack of calls.
+
 config IRQSOFF_TRACER
         bool "Interrupts-off Latency Tracer"
         default n
@@ -138,6 +168,70 @@ config BOOT_TRACER
             selected, because the self-tests are an initcall as well and that
             would invalidate the boot trace. )
 
+config TRACE_BRANCH_PROFILING
+        bool "Trace likely/unlikely profiler"
+        depends on DEBUG_KERNEL
+        select TRACING
+        help
+          This tracer profiles all the the likely and unlikely macros
+          in the kernel. It will display the results in:
+
+          /debugfs/tracing/profile_annotated_branch
+
+          Note: this will add a significant overhead, only turn this
+          on if you need to profile the system's use of these macros.
+
+          Say N if unsure.
+
+config PROFILE_ALL_BRANCHES
+        bool "Profile all if conditionals"
+        depends on TRACE_BRANCH_PROFILING
+        help
+          This tracer profiles all branch conditions. Every if ()
+          taken in the kernel is recorded whether it hit or miss.
+          The results will be displayed in:
+
+          /debugfs/tracing/profile_branch
+
+          This configuration, when enabled, will impose a great overhead
+          on the system. This should only be enabled when the system
+          is to be analyzed
+
+          Say N if unsure.
+
+config TRACING_BRANCHES
+        bool
+        help
+          Selected by tracers that will trace the likely and unlikely
+          conditions. This prevents the tracers themselves from being
+          profiled. Profiling the tracing infrastructure can only happen
+          when the likelys and unlikelys are not being traced.
+
+config BRANCH_TRACER
+        bool "Trace likely/unlikely instances"
+        depends on TRACE_BRANCH_PROFILING
+        select TRACING_BRANCHES
+        help
+          This traces the events of likely and unlikely condition
+          calls in the kernel.  The difference between this and the
+          "Trace likely/unlikely profiler" is that this is not a
+          histogram of the callers, but actually places the calling
+          events into a running trace buffer to see when and where the
+          events happened, as well as their results.
+
+          Say N if unsure.
+
+config POWER_TRACER
+        bool "Trace power consumption behavior"
+        depends on DEBUG_KERNEL
+        depends on X86
+        select TRACING
+        help
+          This tracer helps developers to analyze and optimize the kernels
+          power management decisions, specifically the C-state and P-state
+          behavior.
+
+
 config STACK_TRACER
         bool "Trace max stack"
         depends on HAVE_FUNCTION_TRACER
@@ -150,13 +244,26 @@ config STACK_TRACER
 
           This tracer works by hooking into every function call that the
           kernel executes, and keeping a maximum stack depth value and
-          stack-trace saved. Because this logic has to execute in every
-          kernel function, all the time, this option can slow down the
-          kernel measurably and is generally intended for kernel
-          developers only.
+          stack-trace saved.  If this is configured with DYNAMIC_FTRACE
+          then it will not have any overhead while the stack tracer
+          is disabled.
+
+          To enable the stack tracer on bootup, pass in 'stacktrace'
+          on the kernel command line.
+
+          The stack tracer can also be enabled or disabled via the
+          sysctl kernel.stack_tracer_enabled
 
           Say N if unsure.
 
+config HW_BRANCH_TRACER
+        depends on HAVE_HW_BRANCH_TRACER
+        bool "Trace hw branches"
+        select TRACING
+        help
+          This tracer records all branches on the system in a circular
+          buffer giving access to the last N branches for each cpu.
+
 config DYNAMIC_FTRACE
         bool "enable/disable ftrace tracepoints dynamically"
         depends on FUNCTION_TRACER
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index c8228b1a49e9..349d5a93653f 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -10,6 +10,11 @@ CFLAGS_trace_selftest_dynamic.o = -pg
 obj-y += trace_selftest_dynamic.o
 endif
 
+# If unlikely tracing is enabled, do not trace these files
+ifdef CONFIG_TRACING_BRANCHES
+KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
+endif
+
 obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
 obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
 
@@ -24,5 +29,9 @@ obj-$(CONFIG_NOP_TRACER) += trace_nop.o
 obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
 obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
+obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
+obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
+obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
+obj-$(CONFIG_POWER_TRACER) += trace_power.o
 
 libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 78db083390f0..2f32969c09df 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -47,6 +47,13 @@
 int ftrace_enabled __read_mostly;
 static int last_ftrace_enabled;
 
+/* set when tracing only a pid */
+struct pid *ftrace_pid_trace;
+static struct pid * const ftrace_swapper_pid = &init_struct_pid;
+
+/* Quick disabling of function tracer. */
+int function_trace_stop;
+
 /*
  * ftrace_disabled is set when an anomaly is discovered.
  * ftrace_disabled is much stronger than ftrace_enabled.
@@ -55,6 +62,7 @@ static int ftrace_disabled __read_mostly;
 
 static DEFINE_SPINLOCK(ftrace_lock);
 static DEFINE_MUTEX(ftrace_sysctl_lock);
+static DEFINE_MUTEX(ftrace_start_lock);
 
 static struct ftrace_ops ftrace_list_end __read_mostly =
 {
@@ -63,6 +71,8 @@ static struct ftrace_ops ftrace_list_end __read_mostly =
 
 static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end;
 ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub;
+ftrace_func_t __ftrace_trace_function __read_mostly = ftrace_stub;
+ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub;
 
 static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 {
@@ -79,6 +89,21 @@ static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
         };
 }
 
+static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip)
+{
+        if (!test_tsk_trace_trace(current))
+                return;
+
+        ftrace_pid_function(ip, parent_ip);
+}
+
+static void set_ftrace_pid_function(ftrace_func_t func)
+{
+        /* do not set ftrace_pid_function to itself! */
+        if (func != ftrace_pid_func)
+                ftrace_pid_function = func;
+}
+
 /**
  * clear_ftrace_function - reset the ftrace function
  *
@@ -88,7 +113,23 @@ static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 void clear_ftrace_function(void)
 {
         ftrace_trace_function = ftrace_stub;
+        __ftrace_trace_function = ftrace_stub;
+        ftrace_pid_function = ftrace_stub;
+}
+
+#ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+/*
+ * For those archs that do not test ftrace_trace_stop in their
+ * mcount call site, we need to do it from C.
+ */
+static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip)
+{
+        if (function_trace_stop)
+                return;
+
+        __ftrace_trace_function(ip, parent_ip);
 }
+#endif
 
 static int __register_ftrace_function(struct ftrace_ops *ops)
 {
@@ -106,14 +147,28 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
         ftrace_list = ops;
 
         if (ftrace_enabled) {
+                ftrace_func_t func;
+
+                if (ops->next == &ftrace_list_end)
+                        func = ops->func;
+                else
+                        func = ftrace_list_func;
+
+                if (ftrace_pid_trace) {
+                        set_ftrace_pid_function(func);
+                        func = ftrace_pid_func;
+                }
+
                 /*
                  * For one func, simply call it directly.
                  * For more than one func, call the chain.
                  */
-                if (ops->next == &ftrace_list_end)
-                        ftrace_trace_function = ops->func;
-                else
-                        ftrace_trace_function = ftrace_list_func;
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+                ftrace_trace_function = func;
+#else
+                __ftrace_trace_function = func;
+                ftrace_trace_function = ftrace_test_stop_func;
+#endif
         }
 
         spin_unlock(&ftrace_lock);
@@ -152,9 +207,19 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
 
         if (ftrace_enabled) {
                 /* If we only have one func left, then call that directly */
-                if (ftrace_list == &ftrace_list_end ||
-                    ftrace_list->next == &ftrace_list_end)
-                        ftrace_trace_function = ftrace_list->func;
+                if (ftrace_list->next == &ftrace_list_end) {
+                        ftrace_func_t func = ftrace_list->func;
+
+                        if (ftrace_pid_trace) {
+                                set_ftrace_pid_function(func);
+                                func = ftrace_pid_func;
+                        }
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+                        ftrace_trace_function = func;
+#else
+                        __ftrace_trace_function = func;
+#endif
+                }
         }
 
  out:
@@ -163,6 +228,36 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
         return ret;
 }
 
+static void ftrace_update_pid_func(void)
+{
+        ftrace_func_t func;
+
+        /* should not be called from interrupt context */
+        spin_lock(&ftrace_lock);
+
+        if (ftrace_trace_function == ftrace_stub)
+                goto out;
+
+        func = ftrace_trace_function;
+
+        if (ftrace_pid_trace) {
+                set_ftrace_pid_function(func);
+                func = ftrace_pid_func;
+        } else {
+                if (func == ftrace_pid_func)
+                        func = ftrace_pid_function;
+        }
+
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+        ftrace_trace_function = func;
+#else
+        __ftrace_trace_function = func;
+#endif
+
+ out:
+        spin_unlock(&ftrace_lock);
+}
+
 #ifdef CONFIG_DYNAMIC_FTRACE
 #ifndef CONFIG_FTRACE_MCOUNT_RECORD
 # error Dynamic ftrace depends on MCOUNT_RECORD
@@ -182,6 +277,8 @@ enum {
         FTRACE_UPDATE_TRACE_FUNC        = (1 << 2),
         FTRACE_ENABLE_MCOUNT            = (1 << 3),
         FTRACE_DISABLE_MCOUNT           = (1 << 4),
+        FTRACE_START_FUNC_RET           = (1 << 5),
+        FTRACE_STOP_FUNC_RET            = (1 << 6),
 };
 
 static int ftrace_filtered;
@@ -308,7 +405,7 @@ ftrace_record_ip(unsigned long ip)
 {
         struct dyn_ftrace *rec;
 
-        if (!ftrace_enabled || ftrace_disabled)
+        if (ftrace_disabled)
                 return NULL;
 
         rec = ftrace_alloc_dyn_node(ip);
@@ -322,14 +419,51 @@ ftrace_record_ip(unsigned long ip)
         return rec;
 }
 
-#define FTRACE_ADDR ((long)(ftrace_caller))
+static void print_ip_ins(const char *fmt, unsigned char *p)
+{
+        int i;
+
+        printk(KERN_CONT "%s", fmt);
+
+        for (i = 0; i < MCOUNT_INSN_SIZE; i++)
+                printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]);
+}
+
+static void ftrace_bug(int failed, unsigned long ip)
+{
+        switch (failed) {
+        case -EFAULT:
+                FTRACE_WARN_ON_ONCE(1);
+                pr_info("ftrace faulted on modifying ");
+                print_ip_sym(ip);
+                break;
+        case -EINVAL:
+                FTRACE_WARN_ON_ONCE(1);
+                pr_info("ftrace failed to modify ");
+                print_ip_sym(ip);
+                print_ip_ins(" actual: ", (unsigned char *)ip);
+                printk(KERN_CONT "\n");
+                break;
+        case -EPERM:
+                FTRACE_WARN_ON_ONCE(1);
+                pr_info("ftrace faulted on writing ");
+                print_ip_sym(ip);
+                break;
+        default:
+                FTRACE_WARN_ON_ONCE(1);
+                pr_info("ftrace faulted on unknown error ");
+                print_ip_sym(ip);
+        }
+}
+
 
 static int
-__ftrace_replace_code(struct dyn_ftrace *rec,
-                      unsigned char *nop, int enable)
+__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
 {
         unsigned long ip, fl;
-        unsigned char *call, *old, *new;
+        unsigned long ftrace_addr;
+
+        ftrace_addr = (unsigned long)ftrace_caller;
 
         ip = rec->ip;
 
@@ -388,34 +522,28 @@ __ftrace_replace_code(struct dyn_ftrace *rec,
                 }
         }
 
-        call = ftrace_call_replace(ip, FTRACE_ADDR);
-
-        if (rec->flags & FTRACE_FL_ENABLED) {
-                old = nop;
-                new = call;
-        } else {
-                old = call;
-                new = nop;
-        }
-
-        return ftrace_modify_code(ip, old, new);
+        if (rec->flags & FTRACE_FL_ENABLED)
+                return ftrace_make_call(rec, ftrace_addr);
+        else
+                return ftrace_make_nop(NULL, rec, ftrace_addr);
 }
 
 static void ftrace_replace_code(int enable)
 {
         int i, failed;
-        unsigned char *nop = NULL;
         struct dyn_ftrace *rec;
         struct ftrace_page *pg;
 
-        nop = ftrace_nop_replace();
-
         for (pg = ftrace_pages_start; pg; pg = pg->next) {
                 for (i = 0; i < pg->index; i++) {
                         rec = &pg->records[i];
 
-                        /* don't modify code that has already faulted */
-                        if (rec->flags & FTRACE_FL_FAILED)
+                        /*
+                         * Skip over free records and records that have
+                         * failed.
+                         */
+                        if (rec->flags & FTRACE_FL_FREE ||
+                            rec->flags & FTRACE_FL_FAILED)
                                 continue;
 
                         /* ignore updates to this record's mcount site */
@@ -426,68 +554,30 @@ static void ftrace_replace_code(int enable)
                                 unfreeze_record(rec);
                         }
 
-                        failed = __ftrace_replace_code(rec, nop, enable);
+                        failed = __ftrace_replace_code(rec, enable);
                         if (failed && (rec->flags & FTRACE_FL_CONVERTED)) {
                                 rec->flags |= FTRACE_FL_FAILED;
                                 if ((system_state == SYSTEM_BOOTING) ||
                                     !core_kernel_text(rec->ip)) {
                                         ftrace_free_rec(rec);
-                                }
+                                } else
+                                        ftrace_bug(failed, rec->ip);
                         }
                 }
         }
 }
 
-static void print_ip_ins(const char *fmt, unsigned char *p)
-{
-        int i;
-
-        printk(KERN_CONT "%s", fmt);
-
-        for (i = 0; i < MCOUNT_INSN_SIZE; i++)
-                printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]);
-}
-
 static int
-ftrace_code_disable(struct dyn_ftrace *rec)
+ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
 {
         unsigned long ip;
-        unsigned char *nop, *call;
         int ret;
 
         ip = rec->ip;
 
-        nop = ftrace_nop_replace();
-        call = ftrace_call_replace(ip, mcount_addr);
-
-        ret = ftrace_modify_code(ip, call, nop);
+        ret = ftrace_make_nop(mod, rec, mcount_addr);
         if (ret) {
-                switch (ret) {
-                case -EFAULT:
-                        FTRACE_WARN_ON_ONCE(1);
-                        pr_info("ftrace faulted on modifying ");
-                        print_ip_sym(ip);
-                        break;
-                case -EINVAL:
-                        FTRACE_WARN_ON_ONCE(1);
-                        pr_info("ftrace failed to modify ");
-                        print_ip_sym(ip);
-                        print_ip_ins(" expected: ", call);
-                        print_ip_ins(" actual: ", (unsigned char *)ip);
-                        print_ip_ins(" replace: ", nop);
-                        printk(KERN_CONT "\n");
-                        break;
-                case -EPERM:
-                        FTRACE_WARN_ON_ONCE(1);
-                        pr_info("ftrace faulted on writing ");
-                        print_ip_sym(ip);
-                        break;
-                default:
-                        FTRACE_WARN_ON_ONCE(1);
-                        pr_info("ftrace faulted on unknown error ");
-                        print_ip_sym(ip);
-                }
-
+                ftrace_bug(ret, ip);
                 rec->flags |= FTRACE_FL_FAILED;
                 return 0;
         }
@@ -506,6 +596,11 @@ static int __ftrace_modify_code(void *data)
         if (*command & FTRACE_UPDATE_TRACE_FUNC)
                 ftrace_update_ftrace_func(ftrace_trace_function);
 
+        if (*command & FTRACE_START_FUNC_RET)
+                ftrace_enable_ftrace_graph_caller();
+        else if (*command & FTRACE_STOP_FUNC_RET)
+                ftrace_disable_ftrace_graph_caller();
+
         return 0;
 }
 
@@ -515,43 +610,43 @@ static void ftrace_run_update_code(int command)
 }
 
 static ftrace_func_t saved_ftrace_func;
-static int ftrace_start;
-static DEFINE_MUTEX(ftrace_start_lock);
+static int ftrace_start_up;
 
-static void ftrace_startup(void)
+static void ftrace_startup_enable(int command)
 {
-        int command = 0;
-
-        if (unlikely(ftrace_disabled))
-                return;
-
-        mutex_lock(&ftrace_start_lock);
-        ftrace_start++;
-        command |= FTRACE_ENABLE_CALLS;
-
         if (saved_ftrace_func != ftrace_trace_function) {
                 saved_ftrace_func = ftrace_trace_function;
                 command |= FTRACE_UPDATE_TRACE_FUNC;
         }
 
         if (!command || !ftrace_enabled)
-                goto out;
+                return;
 
         ftrace_run_update_code(command);
- out:
-        mutex_unlock(&ftrace_start_lock);
 }
 
-static void ftrace_shutdown(void)
+static void ftrace_startup(int command)
 {
-        int command = 0;
+        if (unlikely(ftrace_disabled))
+                return;
+
+        mutex_lock(&ftrace_start_lock);
+        ftrace_start_up++;
+        command |= FTRACE_ENABLE_CALLS;
 
+        ftrace_startup_enable(command);
+
+        mutex_unlock(&ftrace_start_lock);
+}
+
+static void ftrace_shutdown(int command)
+{
         if (unlikely(ftrace_disabled))
                 return;
 
         mutex_lock(&ftrace_start_lock);
-        ftrace_start--;
-        if (!ftrace_start)
+        ftrace_start_up--;
+        if (!ftrace_start_up)
                 command |= FTRACE_DISABLE_CALLS;
 
         if (saved_ftrace_func != ftrace_trace_function) {
@@ -577,8 +672,8 @@ static void ftrace_startup_sysctl(void)
         mutex_lock(&ftrace_start_lock);
         /* Force update next time */
         saved_ftrace_func = NULL;
-        /* ftrace_start is true if we want ftrace running */
-        if (ftrace_start)
+        /* ftrace_start_up is true if we want ftrace running */
+        if (ftrace_start_up)
                 command |= FTRACE_ENABLE_CALLS;
 
         ftrace_run_update_code(command);
@@ -593,8 +688,8 @@ static void ftrace_shutdown_sysctl(void)
                 return;
 
         mutex_lock(&ftrace_start_lock);
-        /* ftrace_start is true if ftrace is running */
-        if (ftrace_start)
+        /* ftrace_start_up is true if ftrace is running */
+        if (ftrace_start_up)
                 command |= FTRACE_DISABLE_CALLS;
 
         ftrace_run_update_code(command);
@@ -605,7 +700,7 @@ static cycle_t		ftrace_update_time;
 static unsigned long    ftrace_update_cnt;
 unsigned long           ftrace_update_tot_cnt;
 
-static int ftrace_update_code(void)
+static int ftrace_update_code(struct module *mod)
 {
         struct dyn_ftrace *p, *t;
         cycle_t start, stop;
@@ -622,7 +717,7 @@ static int ftrace_update_code(void)
                 list_del_init(&p->list);
 
                 /* convert record (i.e, patch mcount-call with NOP) */
-                if (ftrace_code_disable(p)) {
+                if (ftrace_code_disable(mod, p)) {
                         p->flags |= FTRACE_FL_CONVERTED;
                         ftrace_update_cnt++;
                 } else
@@ -690,7 +785,6 @@ enum {
 #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
 
 struct ftrace_iterator {
-        loff_t                  pos;
         struct ftrace_page      *pg;
         unsigned                idx;
         unsigned                flags;
@@ -715,6 +809,8 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
                         iter->pg = iter->pg->next;
                         iter->idx = 0;
                         goto retry;
+                } else {
+                        iter->idx = -1;
                 }
         } else {
                 rec = &iter->pg->records[iter->idx++];
@@ -737,8 +833,6 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
         }
         spin_unlock(&ftrace_lock);
 
-        iter->pos = *pos;
-
         return rec;
 }
 
@@ -746,13 +840,15 @@ static void *t_start(struct seq_file *m, loff_t *pos)
 {
         struct ftrace_iterator *iter = m->private;
         void *p = NULL;
-        loff_t l = -1;
 
-        if (*pos > iter->pos)
-                *pos = iter->pos;
+        if (*pos > 0) {
+                if (iter->idx < 0)
+                        return p;
+                (*pos)--;
+                iter->idx--;
+        }
 
-        l = *pos;
-        p = t_next(m, p, &l);
+        p = t_next(m, p, pos);
 
         return p;
 }
@@ -763,21 +859,15 @@ static void t_stop(struct seq_file *m, void *p)
 
 static int t_show(struct seq_file *m, void *v)
 {
-        struct ftrace_iterator *iter = m->private;
         struct dyn_ftrace *rec = v;
         char str[KSYM_SYMBOL_LEN];
-        int ret = 0;
 
         if (!rec)
                 return 0;
 
         kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
 
-        ret = seq_printf(m, "%s\n", str);
-        if (ret < 0) {
-                iter->pos--;
-                iter->idx--;
-        }
+        seq_printf(m, "%s\n", str);
 
         return 0;
 }
@@ -803,7 +893,6 @@ ftrace_avail_open(struct inode *inode, struct file *file)
                 return -ENOMEM;
 
         iter->pg = ftrace_pages_start;
-        iter->pos = 0;
 
         ret = seq_open(file, &show_ftrace_seq_ops);
         if (!ret) {
@@ -890,7 +979,6 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable)
 
         if (file->f_mode & FMODE_READ) {
                 iter->pg = ftrace_pages_start;
-                iter->pos = 0;
                 iter->flags = enable ? FTRACE_ITER_FILTER :
                         FTRACE_ITER_NOTRACE;
 
@@ -959,6 +1047,13 @@ ftrace_match(unsigned char *buff, int len, int enable)
         int type = MATCH_FULL;
         unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
         unsigned i, match = 0, search_len = 0;
+        int not = 0;
+
+        if (buff[0] == '!') {
+                not = 1;
+                buff++;
+                len--;
+        }
 
         for (i = 0; i < len; i++) {
                 if (buff[i] == '*') {
@@ -1012,8 +1107,12 @@ ftrace_match(unsigned char *buff, int len, int enable)
                                         matched = 1;
                                 break;
                         }
-                        if (matched)
-                                rec->flags |= flag;
+                        if (matched) {
+                                if (not)
+                                        rec->flags &= ~flag;
+                                else
+                                        rec->flags |= flag;
+                        }
                 }
                 pg = pg->next;
         }
@@ -1181,7 +1280,7 @@ ftrace_regex_release(struct inode *inode, struct file *file, int enable)
 
         mutex_lock(&ftrace_sysctl_lock);
         mutex_lock(&ftrace_start_lock);
-        if (ftrace_start && ftrace_enabled)
+        if (ftrace_start_up && ftrace_enabled)
                 ftrace_run_update_code(FTRACE_ENABLE_CALLS);
         mutex_unlock(&ftrace_start_lock);
         mutex_unlock(&ftrace_sysctl_lock);
@@ -1233,12 +1332,233 @@ static struct file_operations ftrace_notrace_fops = {
         .release = ftrace_notrace_release,
 };
 
-static __init int ftrace_init_debugfs(void)
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+static DEFINE_MUTEX(graph_lock);
+
+int ftrace_graph_count;
+unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly;
+
+static void *
+g_next(struct seq_file *m, void *v, loff_t *pos)
 {
-        struct dentry *d_tracer;
-        struct dentry *entry;
+        unsigned long *array = m->private;
+        int index = *pos;
 
-        d_tracer = tracing_init_dentry();
+        (*pos)++;
+
+        if (index >= ftrace_graph_count)
+                return NULL;
+
+        return &array[index];
+}
+
+static void *g_start(struct seq_file *m, loff_t *pos)
+{
+        void *p = NULL;
+
+        mutex_lock(&graph_lock);
+
+        p = g_next(m, p, pos);
+
+        return p;
+}
+
+static void g_stop(struct seq_file *m, void *p)
+{
+        mutex_unlock(&graph_lock);
+}
+
+static int g_show(struct seq_file *m, void *v)
+{
+        unsigned long *ptr = v;
+        char str[KSYM_SYMBOL_LEN];
+
+        if (!ptr)
+                return 0;
+
+        kallsyms_lookup(*ptr, NULL, NULL, NULL, str);
+
+        seq_printf(m, "%s\n", str);
+
+        return 0;
+}
+
+static struct seq_operations ftrace_graph_seq_ops = {
+        .start = g_start,
+        .next = g_next,
+        .stop = g_stop,
+        .show = g_show,
+};
+
+static int
+ftrace_graph_open(struct inode *inode, struct file *file)
+{
+        int ret = 0;
+
+        if (unlikely(ftrace_disabled))
+                return -ENODEV;
+
+        mutex_lock(&graph_lock);
+        if ((file->f_mode & FMODE_WRITE) &&
+            !(file->f_flags & O_APPEND)) {
+                ftrace_graph_count = 0;
+                memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs));
+        }
+
+        if (file->f_mode & FMODE_READ) {
+                ret = seq_open(file, &ftrace_graph_seq_ops);
+                if (!ret) {
+                        struct seq_file *m = file->private_data;
+                        m->private = ftrace_graph_funcs;
+                }
+        } else
+                file->private_data = ftrace_graph_funcs;
+        mutex_unlock(&graph_lock);
+
+        return ret;
+}
+
+static ssize_t
+ftrace_graph_read(struct file *file, char __user *ubuf,
+                       size_t cnt, loff_t *ppos)
+{
+        if (file->f_mode & FMODE_READ)
+                return seq_read(file, ubuf, cnt, ppos);
+        else
+                return -EPERM;
+}
+
+static int
+ftrace_set_func(unsigned long *array, int idx, char *buffer)
+{
+        char str[KSYM_SYMBOL_LEN];
+        struct dyn_ftrace *rec;
+        struct ftrace_page *pg;
+        int found = 0;
+        int i, j;
+
+        if (ftrace_disabled)
+                return -ENODEV;
+
+        /* should not be called from interrupt context */
+        spin_lock(&ftrace_lock);
+
+        for (pg = ftrace_pages_start; pg; pg = pg->next) {
+                for (i = 0; i < pg->index; i++) {
+                        rec = &pg->records[i];
+
+                        if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
+                                continue;
+
+                        kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
+                        if (strcmp(str, buffer) == 0) {
+                                found = 1;
+                                for (j = 0; j < idx; j++)
+                                        if (array[j] == rec->ip) {
+                                                found = 0;
+                                                break;
+                                        }
+                                if (found)
+                                        array[idx] = rec->ip;
+                                break;
+                        }
+                }
+        }
+        spin_unlock(&ftrace_lock);
+
+        return found ? 0 : -EINVAL;
+}
+
+static ssize_t
+ftrace_graph_write(struct file *file, const char __user *ubuf,
+                   size_t cnt, loff_t *ppos)
+{
+        unsigned char buffer[FTRACE_BUFF_MAX+1];
+        unsigned long *array;
+        size_t read = 0;
+        ssize_t ret;
+        int index = 0;
+        char ch;
+
+        if (!cnt || cnt < 0)
+                return 0;
+
+        mutex_lock(&graph_lock);
+
+        if (ftrace_graph_count >= FTRACE_GRAPH_MAX_FUNCS) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        if (file->f_mode & FMODE_READ) {
+                struct seq_file *m = file->private_data;
+                array = m->private;
+        } else
+                array = file->private_data;
+
+        ret = get_user(ch, ubuf++);
+        if (ret)
+                goto out;
+        read++;
+        cnt--;
+
+        /* skip white space */
+        while (cnt && isspace(ch)) {
+                ret = get_user(ch, ubuf++);
+                if (ret)
+                        goto out;
+                read++;
+                cnt--;
+        }
+
+        if (isspace(ch)) {
+                *ppos += read;
+                ret = read;
+                goto out;
+        }
+
+        while (cnt && !isspace(ch)) {
+                if (index < FTRACE_BUFF_MAX)
+                        buffer[index++] = ch;
+                else {
+                        ret = -EINVAL;
+                        goto out;
+                }
+                ret = get_user(ch, ubuf++);
+                if (ret)
+                        goto out;
+                read++;
+                cnt--;
+        }
+        buffer[index] = 0;
+
+        /* we allow only one at a time */
+        ret = ftrace_set_func(array, ftrace_graph_count, buffer);
+        if (ret)
+                goto out;
+
+        ftrace_graph_count++;
+
+        file->f_pos += read;
+
+        ret = read;
+ out:
+        mutex_unlock(&graph_lock);
+
+        return ret;
+}
+
+static const struct file_operations ftrace_graph_fops = {
+        .open = ftrace_graph_open,
+        .read = ftrace_graph_read,
+        .write = ftrace_graph_write,
+};
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
+{
+        struct dentry *entry;
 
         entry = debugfs_create_file("available_filter_functions", 0444,
                                     d_tracer, NULL, &ftrace_avail_fops);
@@ -1263,12 +1583,20 @@ static __init int ftrace_init_debugfs(void)
                 pr_warning("Could not create debugfs "
                            "'set_ftrace_notrace' entry\n");
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        entry = debugfs_create_file("set_graph_function", 0444, d_tracer,
+                                    NULL,
+                                    &ftrace_graph_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'set_graph_function' entry\n");
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
         return 0;
 }
 
-fs_initcall(ftrace_init_debugfs);
-
-static int ftrace_convert_nops(unsigned long *start,
+static int ftrace_convert_nops(struct module *mod,
+                               unsigned long *start,
                                unsigned long *end)
 {
         unsigned long *p;
@@ -1279,23 +1607,32 @@ static int ftrace_convert_nops(unsigned long *start,
         p = start;
         while (p < end) {
                 addr = ftrace_call_adjust(*p++);
+                /*
+                 * Some architecture linkers will pad between
+                 * the different mcount_loc sections of different
+                 * object files to satisfy alignments.
+                 * Skip any NULL pointers.
+                 */
+                if (!addr)
+                        continue;
                 ftrace_record_ip(addr);
         }
 
         /* disable interrupts to prevent kstop machine */
         local_irq_save(flags);
-        ftrace_update_code();
+        ftrace_update_code(mod);
         local_irq_restore(flags);
         mutex_unlock(&ftrace_start_lock);
 
         return 0;
 }
 
-void ftrace_init_module(unsigned long *start, unsigned long *end)
+void ftrace_init_module(struct module *mod,
+                        unsigned long *start, unsigned long *end)
 {
         if (ftrace_disabled || start == end)
                 return;
-        ftrace_convert_nops(start, end);
+        ftrace_convert_nops(mod, start, end);
 }
 
 extern unsigned long __start_mcount_loc[];
@@ -1325,7 +1662,8 @@ void __init ftrace_init(void)
 
         last_ftrace_enabled = ftrace_enabled = 1;
 
-        ret = ftrace_convert_nops(__start_mcount_loc,
+        ret = ftrace_convert_nops(NULL,
+                                  __start_mcount_loc,
                                   __stop_mcount_loc);
 
         return;
@@ -1342,12 +1680,186 @@ static int __init ftrace_nodyn_init(void)
 }
 device_initcall(ftrace_nodyn_init);
 
-# define ftrace_startup()               do { } while (0)
-# define ftrace_shutdown()              do { } while (0)
+static inline int ftrace_init_dyn_debugfs(struct dentry *d_tracer) { return 0; }
+static inline void ftrace_startup_enable(int command) { }
+/* Keep as macros so we do not need to define the commands */
+# define ftrace_startup(command)        do { } while (0)
+# define ftrace_shutdown(command)       do { } while (0)
 # define ftrace_startup_sysctl()        do { } while (0)
 # define ftrace_shutdown_sysctl()       do { } while (0)
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
+static ssize_t
+ftrace_pid_read(struct file *file, char __user *ubuf,
+                       size_t cnt, loff_t *ppos)
+{
+        char buf[64];
+        int r;
+
+        if (ftrace_pid_trace == ftrace_swapper_pid)
+                r = sprintf(buf, "swapper tasks\n");
+        else if (ftrace_pid_trace)
+                r = sprintf(buf, "%u\n", pid_nr(ftrace_pid_trace));
+        else
+                r = sprintf(buf, "no pid\n");
+
+        return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static void clear_ftrace_swapper(void)
+{
+        struct task_struct *p;
+        int cpu;
+
+        get_online_cpus();
+        for_each_online_cpu(cpu) {
+                p = idle_task(cpu);
+                clear_tsk_trace_trace(p);
+        }
+        put_online_cpus();
+}
+
+static void set_ftrace_swapper(void)
+{
+        struct task_struct *p;
+        int cpu;
+
+        get_online_cpus();
+        for_each_online_cpu(cpu) {
+                p = idle_task(cpu);
+                set_tsk_trace_trace(p);
+        }
+        put_online_cpus();
+}
+
+static void clear_ftrace_pid(struct pid *pid)
+{
+        struct task_struct *p;
+
+        do_each_pid_task(pid, PIDTYPE_PID, p) {
+                clear_tsk_trace_trace(p);
+        } while_each_pid_task(pid, PIDTYPE_PID, p);
+        put_pid(pid);
+}
+
+static void set_ftrace_pid(struct pid *pid)
+{
+        struct task_struct *p;
+
+        do_each_pid_task(pid, PIDTYPE_PID, p) {
+                set_tsk_trace_trace(p);
+        } while_each_pid_task(pid, PIDTYPE_PID, p);
+}
+
+static void clear_ftrace_pid_task(struct pid **pid)
+{
+        if (*pid == ftrace_swapper_pid)
+                clear_ftrace_swapper();
+        else
+                clear_ftrace_pid(*pid);
+
+        *pid = NULL;
+}
+
+static void set_ftrace_pid_task(struct pid *pid)
+{
+        if (pid == ftrace_swapper_pid)
+                set_ftrace_swapper();
+        else
+                set_ftrace_pid(pid);
+}
+
+static ssize_t
+ftrace_pid_write(struct file *filp, const char __user *ubuf,
+                   size_t cnt, loff_t *ppos)
+{
+        struct pid *pid;
+        char buf[64];
+        long val;
+        int ret;
+
+        if (cnt >= sizeof(buf))
+                return -EINVAL;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        ret = strict_strtol(buf, 10, &val);
+        if (ret < 0)
+                return ret;
+
+        mutex_lock(&ftrace_start_lock);
+        if (val < 0) {
+                /* disable pid tracing */
+                if (!ftrace_pid_trace)
+                        goto out;
+
+                clear_ftrace_pid_task(&ftrace_pid_trace);
+
+        } else {
+                /* swapper task is special */
+                if (!val) {
+                        pid = ftrace_swapper_pid;
+                        if (pid == ftrace_pid_trace)
+                                goto out;
+                } else {
+                        pid = find_get_pid(val);
+
+                        if (pid == ftrace_pid_trace) {
+                                put_pid(pid);
+                                goto out;
+                        }
+                }
+
+                if (ftrace_pid_trace)
+                        clear_ftrace_pid_task(&ftrace_pid_trace);
+
+                if (!pid)
+                        goto out;
+
+                ftrace_pid_trace = pid;
+
+                set_ftrace_pid_task(ftrace_pid_trace);
+        }
+
+        /* update the function call */
+        ftrace_update_pid_func();
+        ftrace_startup_enable(0);
+
+ out:
+        mutex_unlock(&ftrace_start_lock);
+
+        return cnt;
+}
+
+static struct file_operations ftrace_pid_fops = {
+        .read = ftrace_pid_read,
+        .write = ftrace_pid_write,
+};
+
+static __init int ftrace_init_debugfs(void)
+{
+        struct dentry *d_tracer;
+        struct dentry *entry;
+
+        d_tracer = tracing_init_dentry();
+        if (!d_tracer)
+                return 0;
+
+        ftrace_init_dyn_debugfs(d_tracer);
+
+        entry = debugfs_create_file("set_ftrace_pid", 0644, d_tracer,
+                                    NULL, &ftrace_pid_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'set_ftrace_pid' entry\n");
+        return 0;
+}
+
+fs_initcall(ftrace_init_debugfs);
+
 /**
  * ftrace_kill - kill ftrace
  *
@@ -1381,10 +1893,11 @@ int register_ftrace_function(struct ftrace_ops *ops)
                 return -1;
 
         mutex_lock(&ftrace_sysctl_lock);
+
         ret = __register_ftrace_function(ops);
-        ftrace_startup();
-        mutex_unlock(&ftrace_sysctl_lock);
+        ftrace_startup(0);
 
+        mutex_unlock(&ftrace_sysctl_lock);
         return ret;
 }
 
@@ -1400,7 +1913,7 @@ int unregister_ftrace_function(struct ftrace_ops *ops)
 
         mutex_lock(&ftrace_sysctl_lock);
         ret = __unregister_ftrace_function(ops);
-        ftrace_shutdown();
+        ftrace_shutdown(0);
         mutex_unlock(&ftrace_sysctl_lock);
 
         return ret;
@@ -1449,3 +1962,153 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
         return ret;
 }
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+static atomic_t ftrace_graph_active;
+
+int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
+{
+        return 0;
+}
+
+/* The callbacks that hook a function */
+trace_func_graph_ret_t ftrace_graph_return =
+                        (trace_func_graph_ret_t)ftrace_stub;
+trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub;
+
+/* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */
+static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
+{
+        int i;
+        int ret = 0;
+        unsigned long flags;
+        int start = 0, end = FTRACE_RETSTACK_ALLOC_SIZE;
+        struct task_struct *g, *t;
+
+        for (i = 0; i < FTRACE_RETSTACK_ALLOC_SIZE; i++) {
+                ret_stack_list[i] = kmalloc(FTRACE_RETFUNC_DEPTH
+                                        * sizeof(struct ftrace_ret_stack),
+                                        GFP_KERNEL);
+                if (!ret_stack_list[i]) {
+                        start = 0;
+                        end = i;
+                        ret = -ENOMEM;
+                        goto free;
+                }
+        }
+
+        read_lock_irqsave(&tasklist_lock, flags);
+        do_each_thread(g, t) {
+                if (start == end) {
+                        ret = -EAGAIN;
+                        goto unlock;
+                }
+
+                if (t->ret_stack == NULL) {
+                        t->curr_ret_stack = -1;
+                        /* Make sure IRQs see the -1 first: */
+                        barrier();
+                        t->ret_stack = ret_stack_list[start++];
+                        atomic_set(&t->tracing_graph_pause, 0);
+                        atomic_set(&t->trace_overrun, 0);
+                }
+        } while_each_thread(g, t);
+
+unlock:
+        read_unlock_irqrestore(&tasklist_lock, flags);
+free:
+        for (i = start; i < end; i++)
+                kfree(ret_stack_list[i]);
+        return ret;
+}
+
+/* Allocate a return stack for each task */
+static int start_graph_tracing(void)
+{
+        struct ftrace_ret_stack **ret_stack_list;
+        int ret;
+
+        ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE *
+                                sizeof(struct ftrace_ret_stack *),
+                                GFP_KERNEL);
+
+        if (!ret_stack_list)
+                return -ENOMEM;
+
+        do {
+                ret = alloc_retstack_tasklist(ret_stack_list);
+        } while (ret == -EAGAIN);
+
+        kfree(ret_stack_list);
+        return ret;
+}
+
+int register_ftrace_graph(trace_func_graph_ret_t retfunc,
+                        trace_func_graph_ent_t entryfunc)
+{
+        int ret = 0;
+
+        mutex_lock(&ftrace_sysctl_lock);
+
+        atomic_inc(&ftrace_graph_active);
+        ret = start_graph_tracing();
+        if (ret) {
+                atomic_dec(&ftrace_graph_active);
+                goto out;
+        }
+
+        ftrace_graph_return = retfunc;
+        ftrace_graph_entry = entryfunc;
+
+        ftrace_startup(FTRACE_START_FUNC_RET);
+
+out:
+        mutex_unlock(&ftrace_sysctl_lock);
+        return ret;
+}
+
+void unregister_ftrace_graph(void)
+{
+        mutex_lock(&ftrace_sysctl_lock);
+
+        atomic_dec(&ftrace_graph_active);
+        ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
+        ftrace_graph_entry = ftrace_graph_entry_stub;
+        ftrace_shutdown(FTRACE_STOP_FUNC_RET);
+
+        mutex_unlock(&ftrace_sysctl_lock);
+}
+
+/* Allocate a return stack for newly created task */
+void ftrace_graph_init_task(struct task_struct *t)
+{
+        if (atomic_read(&ftrace_graph_active)) {
+                t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
+                                * sizeof(struct ftrace_ret_stack),
+                                GFP_KERNEL);
+                if (!t->ret_stack)
+                        return;
+                t->curr_ret_stack = -1;
+                atomic_set(&t->tracing_graph_pause, 0);
+                atomic_set(&t->trace_overrun, 0);
+        } else
+                t->ret_stack = NULL;
+}
+
+void ftrace_graph_exit_task(struct task_struct *t)
+{
+        struct ftrace_ret_stack *ret_stack = t->ret_stack;
+
+        t->ret_stack = NULL;
+        /* NULL must become visible to IRQs before we free it: */
+        barrier();
+
+        kfree(ret_stack);
+}
+
+void ftrace_graph_stop(void)
+{
+        ftrace_stop();
+}
+#endif
+
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 30d57dd01a85..1d601a7c4587 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -18,8 +18,46 @@
 
 #include "trace.h"
 
-/* Global flag to disable all recording to ring buffers */
-static int ring_buffers_off __read_mostly;
+/*
+ * A fast way to enable or disable all ring buffers is to
+ * call tracing_on or tracing_off. Turning off the ring buffers
+ * prevents all ring buffers from being recorded to.
+ * Turning this switch on, makes it OK to write to the
+ * ring buffer, if the ring buffer is enabled itself.
+ *
+ * There's three layers that must be on in order to write
+ * to the ring buffer.
+ *
+ * 1) This global flag must be set.
+ * 2) The ring buffer must be enabled for recording.
+ * 3) The per cpu buffer must be enabled for recording.
+ *
+ * In case of an anomaly, this global flag has a bit set that
+ * will permantly disable all ring buffers.
+ */
+
+/*
+ * Global flag to disable all recording to ring buffers
+ *  This has two bits: ON, DISABLED
+ *
+ *  ON   DISABLED
+ * ---- ----------
+ *   0      0        : ring buffers are off
+ *   1      0        : ring buffers are on
+ *   X      1        : ring buffers are permanently disabled
+ */
+
+enum {
+        RB_BUFFERS_ON_BIT       = 0,
+        RB_BUFFERS_DISABLED_BIT = 1,
+};
+
+enum {
+        RB_BUFFERS_ON           = 1 << RB_BUFFERS_ON_BIT,
+        RB_BUFFERS_DISABLED     = 1 << RB_BUFFERS_DISABLED_BIT,
+};
+
+static long ring_buffer_flags __read_mostly = RB_BUFFERS_ON;
 
 /**
  * tracing_on - enable all tracing buffers
@@ -29,7 +67,7 @@ static int ring_buffers_off __read_mostly;
  */
 void tracing_on(void)
 {
-        ring_buffers_off = 0;
+        set_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
 }
 EXPORT_SYMBOL_GPL(tracing_on);
 
@@ -43,10 +81,23 @@ EXPORT_SYMBOL_GPL(tracing_on);
  */
 void tracing_off(void)
 {
-        ring_buffers_off = 1;
+        clear_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
 }
 EXPORT_SYMBOL_GPL(tracing_off);
 
+/**
+ * tracing_off_permanent - permanently disable ring buffers
+ *
+ * This function, once called, will disable all ring buffers
+ * permanenty.
+ */
+void tracing_off_permanent(void)
+{
+        set_bit(RB_BUFFERS_DISABLED_BIT, &ring_buffer_flags);
+}
+
+#include "trace.h"
+
 /* Up this if you want to test the TIME_EXTENTS and normalization */
 #define DEBUG_SHIFT 0
 
@@ -58,7 +109,7 @@ u64 ring_buffer_time_stamp(int cpu)
         preempt_disable_notrace();
         /* shift to debug/test normalization and TIME_EXTENTS */
         time = sched_clock() << DEBUG_SHIFT;
-        preempt_enable_notrace();
+        preempt_enable_no_resched_notrace();
 
         return time;
 }
@@ -150,20 +201,24 @@ EXPORT_SYMBOL_GPL(ring_buffer_event_data);
 #define TS_MASK         ((1ULL << TS_SHIFT) - 1)
 #define TS_DELTA_TEST   (~TS_MASK)
 
-/*
- * This hack stolen from mm/slob.c.
- * We can store per page timing information in the page frame of the page.
- * Thanks to Peter Zijlstra for suggesting this idea.
- */
-struct buffer_page {
+struct buffer_data_page {
         u64              time_stamp;    /* page time stamp */
-        local_t          write;         /* index for next write */
         local_t          commit;        /* write commited index */
+        unsigned char    data[];        /* data of buffer page */
+};
+
+struct buffer_page {
+        local_t          write;         /* index for next write */
         unsigned         read;          /* index for next read */
         struct list_head list;          /* list of free pages */
-        void *page;                     /* Actual data page */
+        struct buffer_data_page *page;  /* Actual data page */
 };
 
+static void rb_init_page(struct buffer_data_page *bpage)
+{
+        local_set(&bpage->commit, 0);
+}
+
 /*
  * Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
  * this issue out.
@@ -185,7 +240,7 @@ static inline int test_time_stamp(u64 delta)
         return 0;
 }
 
-#define BUF_PAGE_SIZE PAGE_SIZE
+#define BUF_PAGE_SIZE (PAGE_SIZE - sizeof(struct buffer_data_page))
 
 /*
  * head_page == tail_page && head == tail then buffer is empty.
@@ -193,7 +248,8 @@ static inline int test_time_stamp(u64 delta)
 struct ring_buffer_per_cpu {
         int                             cpu;
         struct ring_buffer              *buffer;
-        spinlock_t                      lock;
+        spinlock_t                      reader_lock; /* serialize readers */
+        raw_spinlock_t                  lock;
         struct lock_class_key           lock_key;
         struct list_head                pages;
         struct buffer_page              *head_page;     /* read from head */
@@ -208,7 +264,6 @@ struct ring_buffer_per_cpu {
 };
 
 struct ring_buffer {
-        unsigned long                   size;
         unsigned                        pages;
         unsigned                        flags;
         int                             cpus;
@@ -227,32 +282,16 @@ struct ring_buffer_iter {
         u64                             read_stamp;
 };
 
+/* buffer may be either ring_buffer or ring_buffer_per_cpu */
 #define RB_WARN_ON(buffer, cond)                                \
-        do {                                                    \
-                if (unlikely(cond)) {                           \
-                        atomic_inc(&buffer->record_disabled);   \
-                        WARN_ON(1);                             \
-                }                                               \
-        } while (0)
-
-#define RB_WARN_ON_RET(buffer, cond)                            \
-        do {                                                    \
-                if (unlikely(cond)) {                           \
-                        atomic_inc(&buffer->record_disabled);   \
-                        WARN_ON(1);                             \
-                        return -1;                              \
-                }                                               \
-        } while (0)
-
-#define RB_WARN_ON_ONCE(buffer, cond)                           \
-        do {                                                    \
-                static int once;                                \
-                if (unlikely(cond) && !once) {                  \
-                        once++;                                 \
+        ({                                                      \
+                int _____ret = unlikely(cond);                  \
+                if (_____ret) {                                 \
                         atomic_inc(&buffer->record_disabled);   \
                         WARN_ON(1);                             \
                 }                                               \
-        } while (0)
+                _____ret;                                       \
+        })
 
 /**
  * check_pages - integrity check of buffer pages
@@ -264,16 +303,20 @@ struct ring_buffer_iter {
 static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
 {
         struct list_head *head = &cpu_buffer->pages;
-        struct buffer_page *page, *tmp;
+        struct buffer_page *bpage, *tmp;
 
-        RB_WARN_ON_RET(cpu_buffer, head->next->prev != head);
-        RB_WARN_ON_RET(cpu_buffer, head->prev->next != head);
+        if (RB_WARN_ON(cpu_buffer, head->next->prev != head))
+                return -1;
+        if (RB_WARN_ON(cpu_buffer, head->prev->next != head))
+                return -1;
 
-        list_for_each_entry_safe(page, tmp, head, list) {
-                RB_WARN_ON_RET(cpu_buffer,
-                               page->list.next->prev != &page->list);
-                RB_WARN_ON_RET(cpu_buffer,
-                               page->list.prev->next != &page->list);
+        list_for_each_entry_safe(bpage, tmp, head, list) {
+                if (RB_WARN_ON(cpu_buffer,
+                               bpage->list.next->prev != &bpage->list))
+                        return -1;
+                if (RB_WARN_ON(cpu_buffer,
+                               bpage->list.prev->next != &bpage->list))
+                        return -1;
         }
 
         return 0;
@@ -283,22 +326,23 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
                              unsigned nr_pages)
 {
         struct list_head *head = &cpu_buffer->pages;
-        struct buffer_page *page, *tmp;
+        struct buffer_page *bpage, *tmp;
         unsigned long addr;
         LIST_HEAD(pages);
         unsigned i;
 
         for (i = 0; i < nr_pages; i++) {
-                page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()),
+                bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
                                     GFP_KERNEL, cpu_to_node(cpu_buffer->cpu));
-                if (!page)
+                if (!bpage)
                         goto free_pages;
-                list_add(&page->list, &pages);
+                list_add(&bpage->list, &pages);
 
                 addr = __get_free_page(GFP_KERNEL);
                 if (!addr)
                         goto free_pages;
-                page->page = (void *)addr;
+                bpage->page = (void *)addr;
+                rb_init_page(bpage->page);
         }
 
         list_splice(&pages, head);
@@ -308,9 +352,9 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
         return 0;
 
  free_pages:
-        list_for_each_entry_safe(page, tmp, &pages, list) {
-                list_del_init(&page->list);
-                free_buffer_page(page);
+        list_for_each_entry_safe(bpage, tmp, &pages, list) {
+                list_del_init(&bpage->list);
+                free_buffer_page(bpage);
         }
         return -ENOMEM;
 }
@@ -319,7 +363,7 @@ static struct ring_buffer_per_cpu *
 rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
-        struct buffer_page *page;
+        struct buffer_page *bpage;
         unsigned long addr;
         int ret;
 
@@ -330,19 +374,21 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
 
         cpu_buffer->cpu = cpu;
         cpu_buffer->buffer = buffer;
-        spin_lock_init(&cpu_buffer->lock);
+        spin_lock_init(&cpu_buffer->reader_lock);
+        cpu_buffer->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
         INIT_LIST_HEAD(&cpu_buffer->pages);
 
-        page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()),
+        bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
                             GFP_KERNEL, cpu_to_node(cpu));
-        if (!page)
+        if (!bpage)
                 goto fail_free_buffer;
 
-        cpu_buffer->reader_page = page;
+        cpu_buffer->reader_page = bpage;
         addr = __get_free_page(GFP_KERNEL);
         if (!addr)
                 goto fail_free_reader;
-        page->page = (void *)addr;
+        bpage->page = (void *)addr;
+        rb_init_page(bpage->page);
 
         INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
 
@@ -367,14 +413,14 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
 static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
 {
         struct list_head *head = &cpu_buffer->pages;
-        struct buffer_page *page, *tmp;
+        struct buffer_page *bpage, *tmp;
 
         list_del_init(&cpu_buffer->reader_page->list);
         free_buffer_page(cpu_buffer->reader_page);
 
-        list_for_each_entry_safe(page, tmp, head, list) {
-                list_del_init(&page->list);
-                free_buffer_page(page);
+        list_for_each_entry_safe(bpage, tmp, head, list) {
+                list_del_init(&bpage->list);
+                free_buffer_page(bpage);
         }
         kfree(cpu_buffer);
 }
@@ -473,7 +519,7 @@ static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
 static void
 rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
 {
-        struct buffer_page *page;
+        struct buffer_page *bpage;
         struct list_head *p;
         unsigned i;
 
@@ -481,13 +527,15 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
         synchronize_sched();
 
         for (i = 0; i < nr_pages; i++) {
-                BUG_ON(list_empty(&cpu_buffer->pages));
+                if (RB_WARN_ON(cpu_buffer, list_empty(&cpu_buffer->pages)))
+                        return;
                 p = cpu_buffer->pages.next;
-                page = list_entry(p, struct buffer_page, list);
-                list_del_init(&page->list);
-                free_buffer_page(page);
+                bpage = list_entry(p, struct buffer_page, list);
+                list_del_init(&bpage->list);
+                free_buffer_page(bpage);
         }
-        BUG_ON(list_empty(&cpu_buffer->pages));
+        if (RB_WARN_ON(cpu_buffer, list_empty(&cpu_buffer->pages)))
+                return;
 
         rb_reset_cpu(cpu_buffer);
 
@@ -501,7 +549,7 @@ static void
 rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
                 struct list_head *pages, unsigned nr_pages)
 {
-        struct buffer_page *page;
+        struct buffer_page *bpage;
         struct list_head *p;
         unsigned i;
 
@@ -509,11 +557,12 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
         synchronize_sched();
 
         for (i = 0; i < nr_pages; i++) {
-                BUG_ON(list_empty(pages));
+                if (RB_WARN_ON(cpu_buffer, list_empty(pages)))
+                        return;
                 p = pages->next;
-                page = list_entry(p, struct buffer_page, list);
-                list_del_init(&page->list);
-                list_add_tail(&page->list, &cpu_buffer->pages);
+                bpage = list_entry(p, struct buffer_page, list);
+                list_del_init(&bpage->list);
+                list_add_tail(&bpage->list, &cpu_buffer->pages);
         }
         rb_reset_cpu(cpu_buffer);
 
@@ -540,7 +589,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
         unsigned nr_pages, rm_pages, new_pages;
-        struct buffer_page *page, *tmp;
+        struct buffer_page *bpage, *tmp;
         unsigned long buffer_size;
         unsigned long addr;
         LIST_HEAD(pages);
@@ -570,7 +619,10 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
         if (size < buffer_size) {
 
                 /* easy case, just free pages */
-                BUG_ON(nr_pages >= buffer->pages);
+                if (RB_WARN_ON(buffer, nr_pages >= buffer->pages)) {
+                        mutex_unlock(&buffer->mutex);
+                        return -1;
+                }
 
                 rm_pages = buffer->pages - nr_pages;
 
@@ -589,21 +641,26 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
          * add these pages to the cpu_buffers. Otherwise we just free
          * them all and return -ENOMEM;
          */
-        BUG_ON(nr_pages <= buffer->pages);
+        if (RB_WARN_ON(buffer, nr_pages <= buffer->pages)) {
+                mutex_unlock(&buffer->mutex);
+                return -1;
+        }
+
         new_pages = nr_pages - buffer->pages;
 
         for_each_buffer_cpu(buffer, cpu) {
                 for (i = 0; i < new_pages; i++) {
-                        page = kzalloc_node(ALIGN(sizeof(*page),
+                        bpage = kzalloc_node(ALIGN(sizeof(*bpage),
                                                   cache_line_size()),
                                             GFP_KERNEL, cpu_to_node(cpu));
-                        if (!page)
+                        if (!bpage)
                                 goto free_pages;
-                        list_add(&page->list, &pages);
+                        list_add(&bpage->list, &pages);
                         addr = __get_free_page(GFP_KERNEL);
                         if (!addr)
                                 goto free_pages;
-                        page->page = (void *)addr;
+                        bpage->page = (void *)addr;
+                        rb_init_page(bpage->page);
                 }
         }
 
@@ -612,7 +669,10 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
                 rb_insert_pages(cpu_buffer, &pages, new_pages);
         }
 
-        BUG_ON(!list_empty(&pages));
+        if (RB_WARN_ON(buffer, !list_empty(&pages))) {
+                mutex_unlock(&buffer->mutex);
+                return -1;
+        }
 
  out:
         buffer->pages = nr_pages;
@@ -621,9 +681,9 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
         return size;
 
  free_pages:
-        list_for_each_entry_safe(page, tmp, &pages, list) {
-                list_del_init(&page->list);
-                free_buffer_page(page);
+        list_for_each_entry_safe(bpage, tmp, &pages, list) {
+                list_del_init(&bpage->list);
+                free_buffer_page(bpage);
         }
         mutex_unlock(&buffer->mutex);
         return -ENOMEM;
@@ -635,9 +695,15 @@ static inline int rb_null_event(struct ring_buffer_event *event)
         return event->type == RINGBUF_TYPE_PADDING;
 }
 
-static inline void *__rb_page_index(struct buffer_page *page, unsigned index)
+static inline void *
+__rb_data_page_index(struct buffer_data_page *bpage, unsigned index)
+{
+        return bpage->data + index;
+}
+
+static inline void *__rb_page_index(struct buffer_page *bpage, unsigned index)
 {
-        return page->page + index;
+        return bpage->page->data + index;
 }
 
 static inline struct ring_buffer_event *
@@ -667,7 +733,7 @@ static inline unsigned rb_page_write(struct buffer_page *bpage)
 
 static inline unsigned rb_page_commit(struct buffer_page *bpage)
 {
-        return local_read(&bpage->commit);
+        return local_read(&bpage->page->commit);
 }
 
 /* Size is determined by what has been commited */
@@ -702,7 +768,8 @@ static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
              head += rb_event_length(event)) {
 
                 event = __rb_page_index(cpu_buffer->head_page, head);
-                BUG_ON(rb_null_event(event));
+                if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
+                        return;
                 /* Only count data entries */
                 if (event->type != RINGBUF_TYPE_DATA)
                         continue;
@@ -712,14 +779,14 @@ static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
 }
 
 static inline void rb_inc_page(struct ring_buffer_per_cpu *cpu_buffer,
-                               struct buffer_page **page)
+                               struct buffer_page **bpage)
 {
-        struct list_head *p = (*page)->list.next;
+        struct list_head *p = (*bpage)->list.next;
 
         if (p == &cpu_buffer->pages)
                 p = p->next;
 
-        *page = list_entry(p, struct buffer_page, list);
+        *bpage = list_entry(p, struct buffer_page, list);
 }
 
 static inline unsigned
@@ -755,16 +822,18 @@ rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
         addr &= PAGE_MASK;
 
         while (cpu_buffer->commit_page->page != (void *)addr) {
-                RB_WARN_ON(cpu_buffer,
-                           cpu_buffer->commit_page == cpu_buffer->tail_page);
-                cpu_buffer->commit_page->commit =
+                if (RB_WARN_ON(cpu_buffer,
+                          cpu_buffer->commit_page == cpu_buffer->tail_page))
+                        return;
+                cpu_buffer->commit_page->page->commit =
                         cpu_buffer->commit_page->write;
                 rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
-                cpu_buffer->write_stamp = cpu_buffer->commit_page->time_stamp;
+                cpu_buffer->write_stamp =
+                        cpu_buffer->commit_page->page->time_stamp;
         }
 
         /* Now set the commit to the event's index */
-        local_set(&cpu_buffer->commit_page->commit, index);
+        local_set(&cpu_buffer->commit_page->page->commit, index);
 }
 
 static inline void
@@ -778,25 +847,38 @@ rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
          * back to us). This allows us to do a simple loop to
          * assign the commit to the tail.
          */
+ again:
         while (cpu_buffer->commit_page != cpu_buffer->tail_page) {
-                cpu_buffer->commit_page->commit =
+                cpu_buffer->commit_page->page->commit =
                         cpu_buffer->commit_page->write;
                 rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
-                cpu_buffer->write_stamp = cpu_buffer->commit_page->time_stamp;
+                cpu_buffer->write_stamp =
+                        cpu_buffer->commit_page->page->time_stamp;
                 /* add barrier to keep gcc from optimizing too much */
                 barrier();
         }
         while (rb_commit_index(cpu_buffer) !=
                rb_page_write(cpu_buffer->commit_page)) {
-                cpu_buffer->commit_page->commit =
+                cpu_buffer->commit_page->page->commit =
                         cpu_buffer->commit_page->write;
                 barrier();
         }
+
+        /* again, keep gcc from optimizing */
+        barrier();
+
+        /*
+         * If an interrupt came in just after the first while loop
+         * and pushed the tail page forward, we will be left with
+         * a dangling commit that will never go forward.
+         */
+        if (unlikely(cpu_buffer->commit_page != cpu_buffer->tail_page))
+                goto again;
 }
 
 static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
 {
-        cpu_buffer->read_stamp = cpu_buffer->reader_page->time_stamp;
+        cpu_buffer->read_stamp = cpu_buffer->reader_page->page->time_stamp;
         cpu_buffer->reader_page->read = 0;
 }
 
@@ -815,7 +897,7 @@ static inline void rb_inc_iter(struct ring_buffer_iter *iter)
         else
                 rb_inc_page(cpu_buffer, &iter->head_page);
 
-        iter->read_stamp = iter->head_page->time_stamp;
+        iter->read_stamp = iter->head_page->page->time_stamp;
         iter->head = 0;
 }
 
@@ -889,12 +971,15 @@ static struct ring_buffer_event *
 __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                   unsigned type, unsigned long length, u64 *ts)
 {
-        struct buffer_page *tail_page, *head_page, *reader_page;
+        struct buffer_page *tail_page, *head_page, *reader_page, *commit_page;
         unsigned long tail, write;
         struct ring_buffer *buffer = cpu_buffer->buffer;
         struct ring_buffer_event *event;
         unsigned long flags;
 
+        commit_page = cpu_buffer->commit_page;
+        /* we just need to protect against interrupts */
+        barrier();
         tail_page = cpu_buffer->tail_page;
         write = local_add_return(length, &tail_page->write);
         tail = write - length;
@@ -903,7 +988,8 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
         if (write > BUF_PAGE_SIZE) {
                 struct buffer_page *next_page = tail_page;
 
-                spin_lock_irqsave(&cpu_buffer->lock, flags);
+                local_irq_save(flags);
+                __raw_spin_lock(&cpu_buffer->lock);
 
                 rb_inc_page(cpu_buffer, &next_page);
 
@@ -911,14 +997,15 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                 reader_page = cpu_buffer->reader_page;
 
                 /* we grabbed the lock before incrementing */
-                RB_WARN_ON(cpu_buffer, next_page == reader_page);
+                if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
+                        goto out_unlock;
 
                 /*
                  * If for some reason, we had an interrupt storm that made
                  * it all the way around the buffer, bail, and warn
                  * about it.
                  */
-                if (unlikely(next_page == cpu_buffer->commit_page)) {
+                if (unlikely(next_page == commit_page)) {
                         WARN_ON_ONCE(1);
                         goto out_unlock;
                 }
@@ -949,12 +1036,12 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                  */
                 if (tail_page == cpu_buffer->tail_page) {
                         local_set(&next_page->write, 0);
-                        local_set(&next_page->commit, 0);
+                        local_set(&next_page->page->commit, 0);
                         cpu_buffer->tail_page = next_page;
 
                         /* reread the time stamp */
                         *ts = ring_buffer_time_stamp(cpu_buffer->cpu);
-                        cpu_buffer->tail_page->time_stamp = *ts;
+                        cpu_buffer->tail_page->page->time_stamp = *ts;
                 }
 
                 /*
@@ -979,7 +1066,8 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
                         rb_set_commit_to_write(cpu_buffer);
                 }
 
-                spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+                __raw_spin_unlock(&cpu_buffer->lock);
+                local_irq_restore(flags);
 
                 /* fail and let the caller try again */
                 return ERR_PTR(-EAGAIN);
@@ -987,7 +1075,8 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
 
         /* We reserved something on the buffer */
 
-        BUG_ON(write > BUF_PAGE_SIZE);
+        if (RB_WARN_ON(cpu_buffer, write > BUF_PAGE_SIZE))
+                return NULL;
 
         event = __rb_page_index(tail_page, tail);
         rb_update_event(event, type, length);
@@ -997,12 +1086,13 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
          * this page's time stamp.
          */
         if (!tail && rb_is_commit(cpu_buffer, event))
-                cpu_buffer->commit_page->time_stamp = *ts;
+                cpu_buffer->commit_page->page->time_stamp = *ts;
 
         return event;
 
  out_unlock:
-        spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+        __raw_spin_unlock(&cpu_buffer->lock);
+        local_irq_restore(flags);
         return NULL;
 }
 
@@ -1047,7 +1137,7 @@ rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
                         event->time_delta = *delta & TS_MASK;
                         event->array[0] = *delta >> TS_SHIFT;
                 } else {
-                        cpu_buffer->commit_page->time_stamp = *ts;
+                        cpu_buffer->commit_page->page->time_stamp = *ts;
                         event->time_delta = 0;
                         event->array[0] = 0;
                 }
@@ -1085,10 +1175,8 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
          * storm or we have something buggy.
          * Bail!
          */
-        if (unlikely(++nr_loops > 1000)) {
-                RB_WARN_ON(cpu_buffer, 1);
+        if (RB_WARN_ON(cpu_buffer, ++nr_loops > 1000))
                 return NULL;
-        }
 
         ts = ring_buffer_time_stamp(cpu_buffer->cpu);
 
@@ -1184,15 +1272,14 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
         struct ring_buffer_event *event;
         int cpu, resched;
 
-        if (ring_buffers_off)
+        if (ring_buffer_flags != RB_BUFFERS_ON)
                 return NULL;
 
         if (atomic_read(&buffer->record_disabled))
                 return NULL;
 
         /* If we are tracing schedule, we don't want to recurse */
-        resched = need_resched();
-        preempt_disable_notrace();
+        resched = ftrace_preempt_disable();
 
         cpu = raw_smp_processor_id();
 
@@ -1223,10 +1310,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
         return event;
 
  out:
-        if (resched)
-                preempt_enable_no_resched_notrace();
-        else
-                preempt_enable_notrace();
+        ftrace_preempt_enable(resched);
         return NULL;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
@@ -1269,12 +1353,9 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
         /*
          * Only the last preempt count needs to restore preemption.
          */
-        if (preempt_count() == 1) {
-                if (per_cpu(rb_need_resched, cpu))
-                        preempt_enable_no_resched_notrace();
-                else
-                        preempt_enable_notrace();
-        } else
+        if (preempt_count() == 1)
+                ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
+        else
                 preempt_enable_no_resched_notrace();
 
         return 0;
@@ -1305,14 +1386,13 @@ int ring_buffer_write(struct ring_buffer *buffer,
         int ret = -EBUSY;
         int cpu, resched;
 
-        if (ring_buffers_off)
+        if (ring_buffer_flags != RB_BUFFERS_ON)
                 return -EBUSY;
 
         if (atomic_read(&buffer->record_disabled))
                 return -EBUSY;
 
-        resched = need_resched();
-        preempt_disable_notrace();
+        resched = ftrace_preempt_disable();
 
         cpu = raw_smp_processor_id();
 
@@ -1338,10 +1418,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
 
         ret = 0;
  out:
-        if (resched)
-                preempt_enable_no_resched_notrace();
-        else
-                preempt_enable_notrace();
+        ftrace_preempt_enable(resched);
 
         return ret;
 }
@@ -1509,14 +1586,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer)
 }
 EXPORT_SYMBOL_GPL(ring_buffer_overruns);
 
-/**
- * ring_buffer_iter_reset - reset an iterator
- * @iter: The iterator to reset
- *
- * Resets the iterator, so that it will start from the beginning
- * again.
- */
-void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
+static void rb_iter_reset(struct ring_buffer_iter *iter)
 {
         struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
 
@@ -1531,7 +1601,24 @@ void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
         if (iter->head)
                 iter->read_stamp = cpu_buffer->read_stamp;
         else
-                iter->read_stamp = iter->head_page->time_stamp;
+                iter->read_stamp = iter->head_page->page->time_stamp;
+}
+
+/**
+ * ring_buffer_iter_reset - reset an iterator
+ * @iter: The iterator to reset
+ *
+ * Resets the iterator, so that it will start from the beginning
+ * again.
+ */
+void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
+{
+        struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+        unsigned long flags;
+
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        rb_iter_reset(iter);
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);
 
@@ -1619,7 +1706,8 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
         unsigned long flags;
         int nr_loops = 0;
 
-        spin_lock_irqsave(&cpu_buffer->lock, flags);
+        local_irq_save(flags);
+        __raw_spin_lock(&cpu_buffer->lock);
 
  again:
         /*
@@ -1628,8 +1716,7 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
          * a case where we will loop three times. There should be no
          * reason to loop four times (that I know of).
          */
-        if (unlikely(++nr_loops > 3)) {
-                RB_WARN_ON(cpu_buffer, 1);
+        if (RB_WARN_ON(cpu_buffer, ++nr_loops > 3)) {
                 reader = NULL;
                 goto out;
         }
@@ -1641,8 +1728,9 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
                 goto out;
 
         /* Never should we have an index greater than the size */
-        RB_WARN_ON(cpu_buffer,
-                   cpu_buffer->reader_page->read > rb_page_size(reader));
+        if (RB_WARN_ON(cpu_buffer,
+                       cpu_buffer->reader_page->read > rb_page_size(reader)))
+                goto out;
 
         /* check if we caught up to the tail */
         reader = NULL;
@@ -1659,7 +1747,7 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
         cpu_buffer->reader_page->list.prev = reader->list.prev;
 
         local_set(&cpu_buffer->reader_page->write, 0);
-        local_set(&cpu_buffer->reader_page->commit, 0);
+        local_set(&cpu_buffer->reader_page->page->commit, 0);
 
         /* Make the reader page now replace the head */
         reader->list.prev->next = &cpu_buffer->reader_page->list;
@@ -1681,7 +1769,8 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
         goto again;
 
  out:
-        spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+        __raw_spin_unlock(&cpu_buffer->lock);
+        local_irq_restore(flags);
 
         return reader;
 }
@@ -1695,7 +1784,8 @@ static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
         reader = rb_get_reader_page(cpu_buffer);
 
         /* This function should not be called when buffer is empty */
-        BUG_ON(!reader);
+        if (RB_WARN_ON(cpu_buffer, !reader))
+                return;
 
         event = rb_reader_event(cpu_buffer);
 
@@ -1722,7 +1812,9 @@ static void rb_advance_iter(struct ring_buffer_iter *iter)
          * Check if we are at the end of the buffer.
          */
         if (iter->head >= rb_page_size(iter->head_page)) {
-                BUG_ON(iter->head_page == cpu_buffer->commit_page);
+                if (RB_WARN_ON(buffer,
+                               iter->head_page == cpu_buffer->commit_page))
+                        return;
                 rb_inc_iter(iter);
                 return;
         }
@@ -1735,8 +1827,10 @@ static void rb_advance_iter(struct ring_buffer_iter *iter)
          * This should not be called to advance the header if we are
          * at the tail of the buffer.
          */
-        BUG_ON((iter->head_page == cpu_buffer->commit_page) &&
-               (iter->head + length > rb_commit_index(cpu_buffer)));
+        if (RB_WARN_ON(cpu_buffer,
+                       (iter->head_page == cpu_buffer->commit_page) &&
+                       (iter->head + length > rb_commit_index(cpu_buffer))))
+                return;
 
         rb_update_iter_read_stamp(iter, event);
 
@@ -1748,17 +1842,8 @@ static void rb_advance_iter(struct ring_buffer_iter *iter)
                 rb_advance_iter(iter);
 }
 
-/**
- * ring_buffer_peek - peek at the next event to be read
- * @buffer: The ring buffer to read
- * @cpu: The cpu to peak at
- * @ts: The timestamp counter of this event.
- *
- * This will return the event that will be read next, but does
- * not consume the data.
- */
-struct ring_buffer_event *
-ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
+static struct ring_buffer_event *
+rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
         struct ring_buffer_event *event;
@@ -1779,10 +1864,8 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
          * can have.  Nesting 10 deep of interrupts is clearly
          * an anomaly.
          */
-        if (unlikely(++nr_loops > 10)) {
-                RB_WARN_ON(cpu_buffer, 1);
+        if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
                 return NULL;
-        }
 
         reader = rb_get_reader_page(cpu_buffer);
         if (!reader)
@@ -1821,16 +1904,8 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
 }
 EXPORT_SYMBOL_GPL(ring_buffer_peek);
 
-/**
- * ring_buffer_iter_peek - peek at the next event to be read
- * @iter: The ring buffer iterator
- * @ts: The timestamp counter of this event.
- *
- * This will return the event that will be read next, but does
- * not increment the iterator.
- */
-struct ring_buffer_event *
-ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
+static struct ring_buffer_event *
+rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 {
         struct ring_buffer *buffer;
         struct ring_buffer_per_cpu *cpu_buffer;
@@ -1852,10 +1927,8 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
          * can have. Nesting 10 deep of interrupts is clearly
          * an anomaly.
          */
-        if (unlikely(++nr_loops > 10)) {
-                RB_WARN_ON(cpu_buffer, 1);
+        if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
                 return NULL;
-        }
 
         if (rb_per_cpu_empty(cpu_buffer))
                 return NULL;
@@ -1893,6 +1966,51 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
 
 /**
+ * ring_buffer_peek - peek at the next event to be read
+ * @buffer: The ring buffer to read
+ * @cpu: The cpu to peak at
+ * @ts: The timestamp counter of this event.
+ *
+ * This will return the event that will be read next, but does
+ * not consume the data.
+ */
+struct ring_buffer_event *
+ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
+{
+        struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+        struct ring_buffer_event *event;
+        unsigned long flags;
+
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        event = rb_buffer_peek(buffer, cpu, ts);
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+        return event;
+}
+
+/**
+ * ring_buffer_iter_peek - peek at the next event to be read
+ * @iter: The ring buffer iterator
+ * @ts: The timestamp counter of this event.
+ *
+ * This will return the event that will be read next, but does
+ * not increment the iterator.
+ */
+struct ring_buffer_event *
+ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
+{
+        struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+        struct ring_buffer_event *event;
+        unsigned long flags;
+
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        event = rb_iter_peek(iter, ts);
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+        return event;
+}
+
+/**
  * ring_buffer_consume - return an event and consume it
  * @buffer: The ring buffer to get the next event from
  *
@@ -1903,19 +2021,24 @@ EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
 struct ring_buffer_event *
 ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
 {
-        struct ring_buffer_per_cpu *cpu_buffer;
+        struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
         struct ring_buffer_event *event;
+        unsigned long flags;
 
         if (!cpu_isset(cpu, buffer->cpumask))
                 return NULL;
 
-        event = ring_buffer_peek(buffer, cpu, ts);
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+
+        event = rb_buffer_peek(buffer, cpu, ts);
         if (!event)
-                return NULL;
+                goto out;
 
-        cpu_buffer = buffer->buffers[cpu];
         rb_advance_reader(cpu_buffer);
 
+ out:
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
         return event;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_consume);
@@ -1953,9 +2076,11 @@ ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
         atomic_inc(&cpu_buffer->record_disabled);
         synchronize_sched();
 
-        spin_lock_irqsave(&cpu_buffer->lock, flags);
-        ring_buffer_iter_reset(iter);
-        spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        __raw_spin_lock(&cpu_buffer->lock);
+        rb_iter_reset(iter);
+        __raw_spin_unlock(&cpu_buffer->lock);
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
         return iter;
 }
@@ -1989,12 +2114,17 @@ struct ring_buffer_event *
 ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
 {
         struct ring_buffer_event *event;
+        struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+        unsigned long flags;
 
-        event = ring_buffer_iter_peek(iter, ts);
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+        event = rb_iter_peek(iter, ts);
         if (!event)
-                return NULL;
+                goto out;
 
         rb_advance_iter(iter);
+ out:
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
         return event;
 }
@@ -2016,7 +2146,7 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
         cpu_buffer->head_page
                 = list_entry(cpu_buffer->pages.next, struct buffer_page, list);
         local_set(&cpu_buffer->head_page->write, 0);
-        local_set(&cpu_buffer->head_page->commit, 0);
+        local_set(&cpu_buffer->head_page->page->commit, 0);
 
         cpu_buffer->head_page->read = 0;
 
@@ -2025,7 +2155,7 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
 
         INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
         local_set(&cpu_buffer->reader_page->write, 0);
-        local_set(&cpu_buffer->reader_page->commit, 0);
+        local_set(&cpu_buffer->reader_page->page->commit, 0);
         cpu_buffer->reader_page->read = 0;
 
         cpu_buffer->overrun = 0;
@@ -2045,11 +2175,15 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
         if (!cpu_isset(cpu, buffer->cpumask))
                 return;
 
-        spin_lock_irqsave(&cpu_buffer->lock, flags);
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+
+        __raw_spin_lock(&cpu_buffer->lock);
 
         rb_reset_cpu(cpu_buffer);
 
-        spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+        __raw_spin_unlock(&cpu_buffer->lock);
+
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
 
@@ -2123,8 +2257,7 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
                 return -EINVAL;
 
         /* At least make sure the two buffers are somewhat the same */
-        if (buffer_a->size != buffer_b->size ||
-            buffer_a->pages != buffer_b->pages)
+        if (buffer_a->pages != buffer_b->pages)
                 return -EINVAL;
 
         cpu_buffer_a = buffer_a->buffers[cpu];
@@ -2152,16 +2285,178 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
 }
 EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
 
+static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
+                              struct buffer_data_page *bpage)
+{
+        struct ring_buffer_event *event;
+        unsigned long head;
+
+        __raw_spin_lock(&cpu_buffer->lock);
+        for (head = 0; head < local_read(&bpage->commit);
+             head += rb_event_length(event)) {
+
+                event = __rb_data_page_index(bpage, head);
+                if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
+                        return;
+                /* Only count data entries */
+                if (event->type != RINGBUF_TYPE_DATA)
+                        continue;
+                cpu_buffer->entries--;
+        }
+        __raw_spin_unlock(&cpu_buffer->lock);
+}
+
+/**
+ * ring_buffer_alloc_read_page - allocate a page to read from buffer
+ * @buffer: the buffer to allocate for.
+ *
+ * This function is used in conjunction with ring_buffer_read_page.
+ * When reading a full page from the ring buffer, these functions
+ * can be used to speed up the process. The calling function should
+ * allocate a few pages first with this function. Then when it
+ * needs to get pages from the ring buffer, it passes the result
+ * of this function into ring_buffer_read_page, which will swap
+ * the page that was allocated, with the read page of the buffer.
+ *
+ * Returns:
+ *  The page allocated, or NULL on error.
+ */
+void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
+{
+        unsigned long addr;
+        struct buffer_data_page *bpage;
+
+        addr = __get_free_page(GFP_KERNEL);
+        if (!addr)
+                return NULL;
+
+        bpage = (void *)addr;
+
+        return bpage;
+}
+
+/**
+ * ring_buffer_free_read_page - free an allocated read page
+ * @buffer: the buffer the page was allocate for
+ * @data: the page to free
+ *
+ * Free a page allocated from ring_buffer_alloc_read_page.
+ */
+void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
+{
+        free_page((unsigned long)data);
+}
+
+/**
+ * ring_buffer_read_page - extract a page from the ring buffer
+ * @buffer: buffer to extract from
+ * @data_page: the page to use allocated from ring_buffer_alloc_read_page
+ * @cpu: the cpu of the buffer to extract
+ * @full: should the extraction only happen when the page is full.
+ *
+ * This function will pull out a page from the ring buffer and consume it.
+ * @data_page must be the address of the variable that was returned
+ * from ring_buffer_alloc_read_page. This is because the page might be used
+ * to swap with a page in the ring buffer.
+ *
+ * for example:
+ *      rpage = ring_buffer_alloc_page(buffer);
+ *      if (!rpage)
+ *              return error;
+ *      ret = ring_buffer_read_page(buffer, &rpage, cpu, 0);
+ *      if (ret)
+ *              process_page(rpage);
+ *
+ * When @full is set, the function will not return true unless
+ * the writer is off the reader page.
+ *
+ * Note: it is up to the calling functions to handle sleeps and wakeups.
+ *  The ring buffer can be used anywhere in the kernel and can not
+ *  blindly call wake_up. The layer that uses the ring buffer must be
+ *  responsible for that.
+ *
+ * Returns:
+ *  1 if data has been transferred
+ *  0 if no data has been transferred.
+ */
+int ring_buffer_read_page(struct ring_buffer *buffer,
+                            void **data_page, int cpu, int full)
+{
+        struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+        struct ring_buffer_event *event;
+        struct buffer_data_page *bpage;
+        unsigned long flags;
+        int ret = 0;
+
+        if (!data_page)
+                return 0;
+
+        bpage = *data_page;
+        if (!bpage)
+                return 0;
+
+        spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+
+        /*
+         * rb_buffer_peek will get the next ring buffer if
+         * the current reader page is empty.
+         */
+        event = rb_buffer_peek(buffer, cpu, NULL);
+        if (!event)
+                goto out;
+
+        /* check for data */
+        if (!local_read(&cpu_buffer->reader_page->page->commit))
+                goto out;
+        /*
+         * If the writer is already off of the read page, then simply
+         * switch the read page with the given page. Otherwise
+         * we need to copy the data from the reader to the writer.
+         */
+        if (cpu_buffer->reader_page == cpu_buffer->commit_page) {
+                unsigned int read = cpu_buffer->reader_page->read;
+
+                if (full)
+                        goto out;
+                /* The writer is still on the reader page, we must copy */
+                bpage = cpu_buffer->reader_page->page;
+                memcpy(bpage->data,
+                       cpu_buffer->reader_page->page->data + read,
+                       local_read(&bpage->commit) - read);
+
+                /* consume what was read */
+                cpu_buffer->reader_page += read;
+
+        } else {
+                /* swap the pages */
+                rb_init_page(bpage);
+                bpage = cpu_buffer->reader_page->page;
+                cpu_buffer->reader_page->page = *data_page;
+                cpu_buffer->reader_page->read = 0;
+                *data_page = bpage;
+        }
+        ret = 1;
+
+        /* update the entry counter */
+        rb_remove_entries(cpu_buffer, bpage);
+ out:
+        spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+        return ret;
+}
+
 static ssize_t
 rb_simple_read(struct file *filp, char __user *ubuf,
                size_t cnt, loff_t *ppos)
 {
-        int *p = filp->private_data;
+        long *p = filp->private_data;
         char buf[64];
         int r;
 
-        /* !ring_buffers_off == tracing_on */
-        r = sprintf(buf, "%d\n", !*p);
+        if (test_bit(RB_BUFFERS_DISABLED_BIT, p))
+                r = sprintf(buf, "permanently disabled\n");
+        else
+                r = sprintf(buf, "%d\n", test_bit(RB_BUFFERS_ON_BIT, p));
 
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
@@ -2170,7 +2465,7 @@ static ssize_t
 rb_simple_write(struct file *filp, const char __user *ubuf,
                 size_t cnt, loff_t *ppos)
 {
-        int *p = filp->private_data;
+        long *p = filp->private_data;
         char buf[64];
         long val;
         int ret;
@@ -2187,8 +2482,10 @@ rb_simple_write(struct file *filp, const char __user *ubuf,
         if (ret < 0)
                 return ret;
 
-        /* !ring_buffers_off == tracing_on */
-        *p = !val;
+        if (val)
+                set_bit(RB_BUFFERS_ON_BIT, p);
+        else
+                clear_bit(RB_BUFFERS_ON_BIT, p);
 
         (*ppos)++;
 
@@ -2210,7 +2507,7 @@ static __init int rb_init_debugfs(void)
         d_tracer = tracing_init_dentry();
 
         entry = debugfs_create_file("tracing_on", 0644, d_tracer,
-                                    &ring_buffers_off, &rb_simple_fops);
+                                    &ring_buffer_flags, &rb_simple_fops);
         if (!entry)
                 pr_warning("Could not create debugfs 'tracing_on' entry\n");
 
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a96b335fe75c..3608f6cb2f7a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -30,6 +30,7 @@
 #include <linux/gfp.h>
 #include <linux/fs.h>
 #include <linux/kprobes.h>
+#include <linux/seq_file.h>
 #include <linux/writeback.h>
 
 #include <linux/stacktrace.h>
@@ -43,6 +44,38 @@
 unsigned long __read_mostly     tracing_max_latency = (cycle_t)ULONG_MAX;
 unsigned long __read_mostly     tracing_thresh;
 
+/*
+ * We need to change this state when a selftest is running.
+ * A selftest will lurk into the ring-buffer to count the
+ * entries inserted during the selftest although some concurrent
+ * insertions into the ring-buffer such as ftrace_printk could occurred
+ * at the same time, giving false positive or negative results.
+ */
+static bool __read_mostly tracing_selftest_running;
+
+/* For tracers that don't implement custom flags */
+static struct tracer_opt dummy_tracer_opt[] = {
+        { }
+};
+
+static struct tracer_flags dummy_tracer_flags = {
+        .val = 0,
+        .opts = dummy_tracer_opt
+};
+
+static int dummy_set_flag(u32 old_flags, u32 bit, int set)
+{
+        return 0;
+}
+
+/*
+ * Kill all tracing for good (never come back).
+ * It is initialized to 1 but will turn to zero if the initialization
+ * of the tracer is successful. But that is the only place that sets
+ * this back to zero.
+ */
+int tracing_disabled = 1;
+
 static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled);
 
 static inline void ftrace_disable_cpu(void)
@@ -62,7 +95,36 @@ static cpumask_t __read_mostly		tracing_buffer_mask;
 #define for_each_tracing_cpu(cpu)       \
         for_each_cpu_mask(cpu, tracing_buffer_mask)
 
-static int tracing_disabled = 1;
+/*
+ * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
+ *
+ * If there is an oops (or kernel panic) and the ftrace_dump_on_oops
+ * is set, then ftrace_dump is called. This will output the contents
+ * of the ftrace buffers to the console.  This is very useful for
+ * capturing traces that lead to crashes and outputing it to a
+ * serial console.
+ *
+ * It is default off, but you can enable it with either specifying
+ * "ftrace_dump_on_oops" in the kernel command line, or setting
+ * /proc/sys/kernel/ftrace_dump_on_oops to true.
+ */
+int ftrace_dump_on_oops;
+
+static int tracing_set_tracer(char *buf);
+
+static int __init set_ftrace(char *str)
+{
+        tracing_set_tracer(str);
+        return 1;
+}
+__setup("ftrace", set_ftrace);
+
+static int __init set_ftrace_dump_on_oops(char *str)
+{
+        ftrace_dump_on_oops = 1;
+        return 1;
+}
+__setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
 
 long
 ns2usecs(cycle_t nsec)
@@ -112,6 +174,19 @@ static DEFINE_PER_CPU(struct trace_array_cpu, max_data);
 /* tracer_enabled is used to toggle activation of a tracer */
 static int                      tracer_enabled = 1;
 
+/**
+ * tracing_is_enabled - return tracer_enabled status
+ *
+ * This function is used by other tracers to know the status
+ * of the tracer_enabled flag.  Tracers may use this function
+ * to know if it should enable their features when starting
+ * up. See irqsoff tracer for an example (start_irqsoff_tracer).
+ */
+int tracing_is_enabled(void)
+{
+        return tracer_enabled;
+}
+
 /* function tracing enabled */
 int                             ftrace_function_enabled;
 
@@ -153,8 +228,9 @@ static DEFINE_MUTEX(trace_types_lock);
 /* trace_wait is a waitqueue for tasks blocked on trace_poll */
 static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 
-/* trace_flags holds iter_ctrl options */
-unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
+/* trace_flags holds trace_options default values */
+unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
+        TRACE_ITER_ANNOTATE;
 
 /**
  * trace_wake_up - wake up tasks waiting for trace input
@@ -193,13 +269,6 @@ unsigned long nsecs_to_usecs(unsigned long nsecs)
         return nsecs / 1000;
 }
 
-/*
- * TRACE_ITER_SYM_MASK masks the options in trace_flags that
- * control the output of kernel symbols.
- */
-#define TRACE_ITER_SYM_MASK \
-        (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
-
 /* These must match the bit postions in trace_iterator_flags */
 static const char *trace_options[] = {
         "print-parent",
@@ -213,6 +282,12 @@ static const char *trace_options[] = {
         "stacktrace",
         "sched-tree",
         "ftrace_printk",
+        "ftrace_preempt",
+        "branch",
+        "annotate",
+        "userstacktrace",
+        "sym-userobj",
+        "printk-msg-only",
         NULL
 };
 
@@ -246,7 +321,7 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 
         memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
         data->pid = tsk->pid;
-        data->uid = tsk->uid;
+        data->uid = task_uid(tsk);
         data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
         data->policy = tsk->policy;
         data->rt_priority = tsk->rt_priority;
@@ -359,6 +434,28 @@ trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
         return trace_seq_putmem(s, hex, j);
 }
 
+static int
+trace_seq_path(struct trace_seq *s, struct path *path)
+{
+        unsigned char *p;
+
+        if (s->len >= (PAGE_SIZE - 1))
+                return 0;
+        p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
+        if (!IS_ERR(p)) {
+                p = mangle_path(s->buffer + s->len, p, "\n");
+                if (p) {
+                        s->len = p - s->buffer;
+                        return 1;
+                }
+        } else {
+                s->buffer[s->len++] = '?';
+                return 1;
+        }
+
+        return 0;
+}
+
 static void
 trace_seq_reset(struct trace_seq *s)
 {
@@ -470,7 +567,17 @@ int register_tracer(struct tracer *type)
                 return -1;
         }
 
+        /*
+         * When this gets called we hold the BKL which means that
+         * preemption is disabled. Various trace selftests however
+         * need to disable and enable preemption for successful tests.
+         * So we drop the BKL here and grab it after the tests again.
+         */
+        unlock_kernel();
         mutex_lock(&trace_types_lock);
+
+        tracing_selftest_running = true;
+
         for (t = trace_types; t; t = t->next) {
                 if (strcmp(type->name, t->name) == 0) {
                         /* already found */
@@ -481,12 +588,20 @@ int register_tracer(struct tracer *type)
                 }
         }
 
+        if (!type->set_flag)
+                type->set_flag = &dummy_set_flag;
+        if (!type->flags)
+                type->flags = &dummy_tracer_flags;
+        else
+                if (!type->flags->opts)
+                        type->flags->opts = dummy_tracer_opt;
+
 #ifdef CONFIG_FTRACE_STARTUP_TEST
         if (type->selftest) {
                 struct tracer *saved_tracer = current_trace;
                 struct trace_array *tr = &global_trace;
-                int saved_ctrl = tr->ctrl;
                 int i;
+
                 /*
                  * Run a selftest on this tracer.
                  * Here we reset the trace buffer, and set the current
@@ -494,25 +609,23 @@ int register_tracer(struct tracer *type)
                  * internal tracing to verify that everything is in order.
                  * If we fail, we do not register this tracer.
                  */
-                for_each_tracing_cpu(i) {
+                for_each_tracing_cpu(i)
                         tracing_reset(tr, i);
-                }
+
                 current_trace = type;
-                tr->ctrl = 0;
                 /* the test is responsible for initializing and enabling */
                 pr_info("Testing tracer %s: ", type->name);
                 ret = type->selftest(type, tr);
                 /* the test is responsible for resetting too */
                 current_trace = saved_tracer;
-                tr->ctrl = saved_ctrl;
                 if (ret) {
                         printk(KERN_CONT "FAILED!\n");
                         goto out;
                 }
                 /* Only reset on passing, to avoid touching corrupted buffers */
-                for_each_tracing_cpu(i) {
+                for_each_tracing_cpu(i)
                         tracing_reset(tr, i);
-                }
+
                 printk(KERN_CONT "PASSED\n");
         }
 #endif
@@ -524,7 +637,9 @@ int register_tracer(struct tracer *type)
                 max_tracer_type_len = len;
 
  out:
+        tracing_selftest_running = false;
         mutex_unlock(&trace_types_lock);
+        lock_kernel();
 
         return ret;
 }
@@ -564,6 +679,16 @@ void tracing_reset(struct trace_array *tr, int cpu)
         ftrace_enable_cpu();
 }
 
+void tracing_reset_online_cpus(struct trace_array *tr)
+{
+        int cpu;
+
+        tr->time_start = ftrace_now(tr->cpu);
+
+        for_each_online_cpu(cpu)
+                tracing_reset(tr, cpu);
+}
+
 #define SAVED_CMDLINES 128
 static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
 static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
@@ -581,6 +706,91 @@ static void trace_init_cmdlines(void)
         cmdline_idx = 0;
 }
 
+static int trace_stop_count;
+static DEFINE_SPINLOCK(tracing_start_lock);
+
+/**
+ * ftrace_off_permanent - disable all ftrace code permanently
+ *
+ * This should only be called when a serious anomally has
+ * been detected.  This will turn off the function tracing,
+ * ring buffers, and other tracing utilites. It takes no
+ * locks and can be called from any context.
+ */
+void ftrace_off_permanent(void)
+{
+        tracing_disabled = 1;
+        ftrace_stop();
+        tracing_off_permanent();
+}
+
+/**
+ * tracing_start - quick start of the tracer
+ *
+ * If tracing is enabled but was stopped by tracing_stop,
+ * this will start the tracer back up.
+ */
+void tracing_start(void)
+{
+        struct ring_buffer *buffer;
+        unsigned long flags;
+
+        if (tracing_disabled)
+                return;
+
+        spin_lock_irqsave(&tracing_start_lock, flags);
+        if (--trace_stop_count)
+                goto out;
+
+        if (trace_stop_count < 0) {
+                /* Someone screwed up their debugging */
+                WARN_ON_ONCE(1);
+                trace_stop_count = 0;
+                goto out;
+        }
+
+
+        buffer = global_trace.buffer;
+        if (buffer)
+                ring_buffer_record_enable(buffer);
+
+        buffer = max_tr.buffer;
+        if (buffer)
+                ring_buffer_record_enable(buffer);
+
+        ftrace_start();
+ out:
+        spin_unlock_irqrestore(&tracing_start_lock, flags);
+}
+
+/**
+ * tracing_stop - quick stop of the tracer
+ *
+ * Light weight way to stop tracing. Use in conjunction with
+ * tracing_start.
+ */
+void tracing_stop(void)
+{
+        struct ring_buffer *buffer;
+        unsigned long flags;
+
+        ftrace_stop();
+        spin_lock_irqsave(&tracing_start_lock, flags);
+        if (trace_stop_count++)
+                goto out;
+
+        buffer = global_trace.buffer;
+        if (buffer)
+                ring_buffer_record_disable(buffer);
+
+        buffer = max_tr.buffer;
+        if (buffer)
+                ring_buffer_record_disable(buffer);
+
+ out:
+        spin_unlock_irqrestore(&tracing_start_lock, flags);
+}
+
 void trace_stop_cmdline_recording(void);
 
 static void trace_save_cmdline(struct task_struct *tsk)
@@ -618,7 +828,7 @@ static void trace_save_cmdline(struct task_struct *tsk)
         spin_unlock(&trace_cmdline_lock);
 }
 
-static char *trace_find_cmdline(int pid)
+char *trace_find_cmdline(int pid)
 {
         char *cmdline = "<...>";
         unsigned map;
@@ -655,6 +865,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
 
         entry->preempt_count            = pc & 0xff;
         entry->pid                      = (tsk) ? tsk->pid : 0;
+        entry->tgid                     = (tsk) ? tsk->tgid : 0;
         entry->flags =
 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
                 (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
@@ -691,6 +902,56 @@ trace_function(struct trace_array *tr, struct trace_array_cpu *data,
         ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 }
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static void __trace_graph_entry(struct trace_array *tr,
+                                struct trace_array_cpu *data,
+                                struct ftrace_graph_ent *trace,
+                                unsigned long flags,
+                                int pc)
+{
+        struct ring_buffer_event *event;
+        struct ftrace_graph_ent_entry *entry;
+        unsigned long irq_flags;
+
+        if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+                return;
+
+        event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                return;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, flags, pc);
+        entry->ent.type                 = TRACE_GRAPH_ENT;
+        entry->graph_ent                        = *trace;
+        ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags);
+}
+
+static void __trace_graph_return(struct trace_array *tr,
+                                struct trace_array_cpu *data,
+                                struct ftrace_graph_ret *trace,
+                                unsigned long flags,
+                                int pc)
+{
+        struct ring_buffer_event *event;
+        struct ftrace_graph_ret_entry *entry;
+        unsigned long irq_flags;
+
+        if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+                return;
+
+        event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                return;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, flags, pc);
+        entry->ent.type                 = TRACE_GRAPH_RET;
+        entry->ret                              = *trace;
+        ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags);
+}
+#endif
+
 void
 ftrace(struct trace_array *tr, struct trace_array_cpu *data,
        unsigned long ip, unsigned long parent_ip, unsigned long flags,
@@ -742,6 +1003,46 @@ void __trace_stack(struct trace_array *tr,
         ftrace_trace_stack(tr, data, flags, skip, preempt_count());
 }
 
+static void ftrace_trace_userstack(struct trace_array *tr,
+                   struct trace_array_cpu *data,
+                   unsigned long flags, int pc)
+{
+#ifdef CONFIG_STACKTRACE
+        struct ring_buffer_event *event;
+        struct userstack_entry *entry;
+        struct stack_trace trace;
+        unsigned long irq_flags;
+
+        if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
+                return;
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                return;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, flags, pc);
+        entry->ent.type         = TRACE_USER_STACK;
+
+        memset(&entry->caller, 0, sizeof(entry->caller));
+
+        trace.nr_entries        = 0;
+        trace.max_entries       = FTRACE_STACK_ENTRIES;
+        trace.skip              = 0;
+        trace.entries           = entry->caller;
+
+        save_stack_trace_user(&trace);
+        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+#endif
+}
+
+void __trace_userstack(struct trace_array *tr,
+                   struct trace_array_cpu *data,
+                   unsigned long flags)
+{
+        ftrace_trace_userstack(tr, data, flags, preempt_count());
+}
+
 static void
 ftrace_trace_special(void *__tr, void *__data,
                      unsigned long arg1, unsigned long arg2, unsigned long arg3,
@@ -765,6 +1066,7 @@ ftrace_trace_special(void *__tr, void *__data,
         entry->arg3                     = arg3;
         ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
         ftrace_trace_stack(tr, data, irq_flags, 4, pc);
+        ftrace_trace_userstack(tr, data, irq_flags, pc);
 
         trace_wake_up();
 }
@@ -803,6 +1105,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
         entry->next_cpu = task_cpu(next);
         ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
         ftrace_trace_stack(tr, data, flags, 5, pc);
+        ftrace_trace_userstack(tr, data, flags, pc);
 }
 
 void
@@ -832,6 +1135,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
         entry->next_cpu                 = task_cpu(wakee);
         ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
         ftrace_trace_stack(tr, data, flags, 6, pc);
+        ftrace_trace_userstack(tr, data, flags, pc);
 
         trace_wake_up();
 }
@@ -841,26 +1145,28 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
 {
         struct trace_array *tr = &global_trace;
         struct trace_array_cpu *data;
+        unsigned long flags;
         int cpu;
         int pc;
 
-        if (tracing_disabled || !tr->ctrl)
+        if (tracing_disabled)
                 return;
 
         pc = preempt_count();
-        preempt_disable_notrace();
+        local_irq_save(flags);
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
 
-        if (likely(!atomic_read(&data->disabled)))
+        if (likely(atomic_inc_return(&data->disabled) == 1))
                 ftrace_trace_special(tr, data, arg1, arg2, arg3, pc);
 
-        preempt_enable_notrace();
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
 }
 
 #ifdef CONFIG_FUNCTION_TRACER
 static void
-function_trace_call(unsigned long ip, unsigned long parent_ip)
+function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
 {
         struct trace_array *tr = &global_trace;
         struct trace_array_cpu *data;
@@ -873,8 +1179,7 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
                 return;
 
         pc = preempt_count();
-        resched = need_resched();
-        preempt_disable_notrace();
+        resched = ftrace_preempt_disable();
         local_save_flags(flags);
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
@@ -884,12 +1189,97 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
                 trace_function(tr, data, ip, parent_ip, flags, pc);
 
         atomic_dec(&data->disabled);
-        if (resched)
-                preempt_enable_no_resched_notrace();
-        else
-                preempt_enable_notrace();
+        ftrace_preempt_enable(resched);
 }
 
+static void
+function_trace_call(unsigned long ip, unsigned long parent_ip)
+{
+        struct trace_array *tr = &global_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+        int pc;
+
+        if (unlikely(!ftrace_function_enabled))
+                return;
+
+        /*
+         * Need to use raw, since this must be called before the
+         * recursive protection is performed.
+         */
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+
+        if (likely(disabled == 1)) {
+                pc = preempt_count();
+                trace_function(tr, data, ip, parent_ip, flags, pc);
+        }
+
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+int trace_graph_entry(struct ftrace_graph_ent *trace)
+{
+        struct trace_array *tr = &global_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+        int pc;
+
+        if (!ftrace_trace_task(current))
+                return 0;
+
+        if (!ftrace_graph_addr(trace->func))
+                return 0;
+
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+        if (likely(disabled == 1)) {
+                pc = preempt_count();
+                __trace_graph_entry(tr, data, trace, flags, pc);
+        }
+        /* Only do the atomic if it is not already set */
+        if (!test_tsk_trace_graph(current))
+                set_tsk_trace_graph(current);
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
+
+        return 1;
+}
+
+void trace_graph_return(struct ftrace_graph_ret *trace)
+{
+        struct trace_array *tr = &global_trace;
+        struct trace_array_cpu *data;
+        unsigned long flags;
+        long disabled;
+        int cpu;
+        int pc;
+
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        data = tr->data[cpu];
+        disabled = atomic_inc_return(&data->disabled);
+        if (likely(disabled == 1)) {
+                pc = preempt_count();
+                __trace_graph_return(tr, data, trace, flags, pc);
+        }
+        if (!trace->depth)
+                clear_tsk_trace_graph(current);
+        atomic_dec(&data->disabled);
+        local_irq_restore(flags);
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
 static struct ftrace_ops trace_ops __read_mostly =
 {
         .func = function_trace_call,
@@ -898,9 +1288,14 @@ static struct ftrace_ops trace_ops __read_mostly =
 void tracing_start_function_trace(void)
 {
         ftrace_function_enabled = 0;
+
+        if (trace_flags & TRACE_ITER_PREEMPTONLY)
+                trace_ops.func = function_trace_call_preempt_only;
+        else
+                trace_ops.func = function_trace_call;
+
         register_ftrace_function(&trace_ops);
-        if (tracer_enabled)
-                ftrace_function_enabled = 1;
+        ftrace_function_enabled = 1;
 }
 
 void tracing_stop_function_trace(void)
@@ -912,6 +1307,7 @@ void tracing_stop_function_trace(void)
 
 enum trace_file_type {
         TRACE_FILE_LAT_FMT      = 1,
+        TRACE_FILE_ANNOTATE     = 2,
 };
 
 static void trace_iterator_increment(struct trace_iterator *iter)
@@ -1047,10 +1443,6 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 
         atomic_inc(&trace_record_cmdline_disabled);
 
-        /* let the tracer grab locks here if needed */
-        if (current_trace->start)
-                current_trace->start(iter);
-
         if (*pos != iter->pos) {
                 iter->ent = NULL;
                 iter->cpu = 0;
@@ -1077,14 +1469,7 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 
 static void s_stop(struct seq_file *m, void *p)
 {
-        struct trace_iterator *iter = m->private;
-
         atomic_dec(&trace_record_cmdline_disabled);
-
-        /* let the tracer release locks here if needed */
-        if (current_trace && current_trace == iter->trace && iter->trace->stop)
-                iter->trace->stop(iter);
-
         mutex_unlock(&trace_types_lock);
 }
 
@@ -1143,7 +1528,7 @@ seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 # define IP_FMT "%016lx"
 #endif
 
-static int
+int
 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 {
         int ret;
@@ -1164,6 +1549,78 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
         return ret;
 }
 
+static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
+                                    unsigned long ip, unsigned long sym_flags)
+{
+        struct file *file = NULL;
+        unsigned long vmstart = 0;
+        int ret = 1;
+
+        if (mm) {
+                const struct vm_area_struct *vma;
+
+                down_read(&mm->mmap_sem);
+                vma = find_vma(mm, ip);
+                if (vma) {
+                        file = vma->vm_file;
+                        vmstart = vma->vm_start;
+                }
+                if (file) {
+                        ret = trace_seq_path(s, &file->f_path);
+                        if (ret)
+                                ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
+                }
+                up_read(&mm->mmap_sem);
+        }
+        if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
+                ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
+        return ret;
+}
+
+static int
+seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
+                      unsigned long sym_flags)
+{
+        struct mm_struct *mm = NULL;
+        int ret = 1;
+        unsigned int i;
+
+        if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
+                struct task_struct *task;
+                /*
+                 * we do the lookup on the thread group leader,
+                 * since individual threads might have already quit!
+                 */
+                rcu_read_lock();
+                task = find_task_by_vpid(entry->ent.tgid);
+                if (task)
+                        mm = get_task_mm(task);
+                rcu_read_unlock();
+        }
+
+        for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
+                unsigned long ip = entry->caller[i];
+
+                if (ip == ULONG_MAX || !ret)
+                        break;
+                if (i && ret)
+                        ret = trace_seq_puts(s, " <- ");
+                if (!ip) {
+                        if (ret)
+                                ret = trace_seq_puts(s, "??");
+                        continue;
+                }
+                if (!ret)
+                        break;
+                if (ret)
+                        ret = seq_print_user_ip(s, mm, ip, sym_flags);
+        }
+
+        if (mm)
+                mmput(mm);
+        return ret;
+}
+
 static void print_lat_help_header(struct seq_file *m)
 {
         seq_puts(m, "#                  _------=> CPU#            \n");
@@ -1301,6 +1758,13 @@ lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 
 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 
+static int task_state_char(unsigned long state)
+{
+        int bit = state ? __ffs(state) + 1 : 0;
+
+        return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
 /*
  * The message is supposed to contain an ending newline.
  * If the printing stops prematurely, try to add a newline of our own.
@@ -1338,6 +1802,23 @@ void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
                 trace_seq_putc(s, '\n');
 }
 
+static void test_cpu_buff_start(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+
+        if (!(trace_flags & TRACE_ITER_ANNOTATE))
+                return;
+
+        if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
+                return;
+
+        if (cpu_isset(iter->cpu, iter->started))
+                return;
+
+        cpu_set(iter->cpu, iter->started);
+        trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
+}
+
 static enum print_line_t
 print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 {
@@ -1352,11 +1833,12 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
         char *comm;
         int S, T;
         int i;
-        unsigned state;
 
         if (entry->type == TRACE_CONT)
                 return TRACE_TYPE_HANDLED;
 
+        test_cpu_buff_start(iter);
+
         next_entry = find_next_entry(iter, NULL, &next_ts);
         if (!next_entry)
                 next_ts = iter->ts;
@@ -1396,12 +1878,8 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 
                 trace_assign_type(field, entry);
 
-                T = field->next_state < sizeof(state_to_char) ?
-                        state_to_char[field->next_state] : 'X';
-
-                state = field->prev_state ?
-                        __ffs(field->prev_state) + 1 : 0;
-                S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
+                T = task_state_char(field->next_state);
+                S = task_state_char(field->prev_state);
                 comm = trace_find_cmdline(field->next_pid);
                 trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
                                  field->prev_pid,
@@ -1448,6 +1926,27 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
                         trace_seq_print_cont(s, iter);
                 break;
         }
+        case TRACE_BRANCH: {
+                struct trace_branch *field;
+
+                trace_assign_type(field, entry);
+
+                trace_seq_printf(s, "[%s] %s:%s:%d\n",
+                                 field->correct ? "  ok  " : " MISS ",
+                                 field->func,
+                                 field->file,
+                                 field->line);
+                break;
+        }
+        case TRACE_USER_STACK: {
+                struct userstack_entry *field;
+
+                trace_assign_type(field, entry);
+
+                seq_print_userip_objs(field, s, sym_flags);
+                trace_seq_putc(s, '\n');
+                break;
+        }
         default:
                 trace_seq_printf(s, "Unknown type %d\n", entry->type);
         }
@@ -1472,6 +1971,8 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
         if (entry->type == TRACE_CONT)
                 return TRACE_TYPE_HANDLED;
 
+        test_cpu_buff_start(iter);
+
         comm = trace_find_cmdline(iter->ent->pid);
 
         t = ns2usecs(iter->ts);
@@ -1519,10 +2020,8 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
 
                 trace_assign_type(field, entry);
 
-                S = field->prev_state < sizeof(state_to_char) ?
-                        state_to_char[field->prev_state] : 'X';
-                T = field->next_state < sizeof(state_to_char) ?
-                        state_to_char[field->next_state] : 'X';
+                T = task_state_char(field->next_state);
+                S = task_state_char(field->prev_state);
                 ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
                                        field->prev_pid,
                                        field->prev_prio,
@@ -1581,6 +2080,37 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
                         trace_seq_print_cont(s, iter);
                 break;
         }
+        case TRACE_GRAPH_RET: {
+                return print_graph_function(iter);
+        }
+        case TRACE_GRAPH_ENT: {
+                return print_graph_function(iter);
+        }
+        case TRACE_BRANCH: {
+                struct trace_branch *field;
+
+                trace_assign_type(field, entry);
+
+                trace_seq_printf(s, "[%s] %s:%s:%d\n",
+                                 field->correct ? "  ok  " : " MISS ",
+                                 field->func,
+                                 field->file,
+                                 field->line);
+                break;
+        }
+        case TRACE_USER_STACK: {
+                struct userstack_entry *field;
+
+                trace_assign_type(field, entry);
+
+                ret = seq_print_userip_objs(field, s, sym_flags);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                ret = trace_seq_putc(s, '\n');
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                break;
+        }
         }
         return TRACE_TYPE_HANDLED;
 }
@@ -1621,12 +2151,9 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
 
                 trace_assign_type(field, entry);
 
-                S = field->prev_state < sizeof(state_to_char) ?
-                        state_to_char[field->prev_state] : 'X';
-                T = field->next_state < sizeof(state_to_char) ?
-                        state_to_char[field->next_state] : 'X';
-                if (entry->type == TRACE_WAKE)
-                        S = '+';
+                T = task_state_char(field->next_state);
+                S = entry->type == TRACE_WAKE ? '+' :
+                        task_state_char(field->prev_state);
                 ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
                                        field->prev_pid,
                                        field->prev_prio,
@@ -1640,6 +2167,7 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
                 break;
         }
         case TRACE_SPECIAL:
+        case TRACE_USER_STACK:
         case TRACE_STACK: {
                 struct special_entry *field;
 
@@ -1712,12 +2240,9 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
 
                 trace_assign_type(field, entry);
 
-                S = field->prev_state < sizeof(state_to_char) ?
-                        state_to_char[field->prev_state] : 'X';
-                T = field->next_state < sizeof(state_to_char) ?
-                        state_to_char[field->next_state] : 'X';
-                if (entry->type == TRACE_WAKE)
-                        S = '+';
+                T = task_state_char(field->next_state);
+                S = entry->type == TRACE_WAKE ? '+' :
+                        task_state_char(field->prev_state);
                 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
                 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
                 SEQ_PUT_HEX_FIELD_RET(s, S);
@@ -1728,6 +2253,7 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
                 break;
         }
         case TRACE_SPECIAL:
+        case TRACE_USER_STACK:
         case TRACE_STACK: {
                 struct special_entry *field;
 
@@ -1744,6 +2270,25 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
         return TRACE_TYPE_HANDLED;
 }
 
+static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry = iter->ent;
+        struct print_entry *field;
+        int ret;
+
+        trace_assign_type(field, entry);
+
+        ret = trace_seq_printf(s, field->buf);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        if (entry->flags & TRACE_FLAG_CONT)
+                trace_seq_print_cont(s, iter);
+
+        return TRACE_TYPE_HANDLED;
+}
+
 static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
@@ -1782,6 +2327,7 @@ static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
                 break;
         }
         case TRACE_SPECIAL:
+        case TRACE_USER_STACK:
         case TRACE_STACK: {
                 struct special_entry *field;
 
@@ -1823,6 +2369,11 @@ static enum print_line_t print_trace_line(struct trace_iterator *iter)
                         return ret;
         }
 
+        if (iter->ent->type == TRACE_PRINT &&
+                        trace_flags & TRACE_ITER_PRINTK &&
+                        trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+                return print_printk_msg_only(iter);
+
         if (trace_flags & TRACE_ITER_BIN)
                 return print_bin_fmt(iter);
 
@@ -1847,7 +2398,9 @@ static int s_show(struct seq_file *m, void *v)
                         seq_printf(m, "# tracer: %s\n", iter->trace->name);
                         seq_puts(m, "#\n");
                 }
-                if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
+                if (iter->trace && iter->trace->print_header)
+                        iter->trace->print_header(m);
+                else if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
                         /* print nothing if the buffers are empty */
                         if (trace_empty(iter))
                                 return 0;
@@ -1899,6 +2452,15 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
         iter->trace = current_trace;
         iter->pos = -1;
 
+        /* Notify the tracer early; before we stop tracing. */
+        if (iter->trace && iter->trace->open)
+                iter->trace->open(iter);
+
+        /* Annotate start of buffers if we had overruns */
+        if (ring_buffer_overruns(iter->tr->buffer))
+                iter->iter_flags |= TRACE_FILE_ANNOTATE;
+
+
         for_each_tracing_cpu(cpu) {
 
                 iter->buffer_iter[cpu] =
@@ -1917,13 +2479,7 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
         m->private = iter;
 
         /* stop the trace while dumping */
-        if (iter->tr->ctrl) {
-                tracer_enabled = 0;
-                ftrace_function_enabled = 0;
-        }
-
-        if (iter->trace && iter->trace->open)
-                        iter->trace->open(iter);
+        tracing_stop();
 
         mutex_unlock(&trace_types_lock);
 
@@ -1966,14 +2522,7 @@ int tracing_release(struct inode *inode, struct file *file)
                 iter->trace->close(iter);
 
         /* reenable tracing if it was previously enabled */
-        if (iter->tr->ctrl) {
-                tracer_enabled = 1;
-                /*
-                 * It is safe to enable function tracing even if it
-                 * isn't used
-                 */
-                ftrace_function_enabled = 1;
-        }
+        tracing_start();
         mutex_unlock(&trace_types_lock);
 
         seq_release(inode, file);
@@ -2151,7 +2700,7 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
         if (err)
                 goto err_unlock;
 
-        raw_local_irq_disable();
+        local_irq_disable();
         __raw_spin_lock(&ftrace_max_lock);
         for_each_tracing_cpu(cpu) {
                 /*
@@ -2168,7 +2717,7 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
                 }
         }
         __raw_spin_unlock(&ftrace_max_lock);
-        raw_local_irq_enable();
+        local_irq_enable();
 
         tracing_cpumask = tracing_cpumask_new;
 
@@ -2189,13 +2738,16 @@ static struct file_operations tracing_cpumask_fops = {
 };
 
 static ssize_t
-tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
+tracing_trace_options_read(struct file *filp, char __user *ubuf,
                        size_t cnt, loff_t *ppos)
 {
+        int i;
         char *buf;
         int r = 0;
         int len = 0;
-        int i;
+        u32 tracer_flags = current_trace->flags->val;
+        struct tracer_opt *trace_opts = current_trace->flags->opts;
+
 
         /* calulate max size */
         for (i = 0; trace_options[i]; i++) {
@@ -2203,6 +2755,15 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
                 len += 3; /* "no" and space */
         }
 
+        /*
+         * Increase the size with names of options specific
+         * of the current tracer.
+         */
+        for (i = 0; trace_opts[i].name; i++) {
+                len += strlen(trace_opts[i].name);
+                len += 3; /* "no" and space */
+        }
+
         /* +2 for \n and \0 */
         buf = kmalloc(len + 2, GFP_KERNEL);
         if (!buf)
@@ -2215,6 +2776,15 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
                         r += sprintf(buf + r, "no%s ", trace_options[i]);
         }
 
+        for (i = 0; trace_opts[i].name; i++) {
+                if (tracer_flags & trace_opts[i].bit)
+                        r += sprintf(buf + r, "%s ",
+                                trace_opts[i].name);
+                else
+                        r += sprintf(buf + r, "no%s ",
+                                trace_opts[i].name);
+        }
+
         r += sprintf(buf + r, "\n");
         WARN_ON(r >= len + 2);
 
@@ -2225,13 +2795,48 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
         return r;
 }
 
+/* Try to assign a tracer specific option */
+static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
+{
+        struct tracer_flags *trace_flags = trace->flags;
+        struct tracer_opt *opts = NULL;
+        int ret = 0, i = 0;
+        int len;
+
+        for (i = 0; trace_flags->opts[i].name; i++) {
+                opts = &trace_flags->opts[i];
+                len = strlen(opts->name);
+
+                if (strncmp(cmp, opts->name, len) == 0) {
+                        ret = trace->set_flag(trace_flags->val,
+                                opts->bit, !neg);
+                        break;
+                }
+        }
+        /* Not found */
+        if (!trace_flags->opts[i].name)
+                return -EINVAL;
+
+        /* Refused to handle */
+        if (ret)
+                return ret;
+
+        if (neg)
+                trace_flags->val &= ~opts->bit;
+        else
+                trace_flags->val |= opts->bit;
+
+        return 0;
+}
+
 static ssize_t
-tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
+tracing_trace_options_write(struct file *filp, const char __user *ubuf,
                         size_t cnt, loff_t *ppos)
 {
         char buf[64];
         char *cmp = buf;
         int neg = 0;
+        int ret;
         int i;
 
         if (cnt >= sizeof(buf))
@@ -2258,11 +2863,13 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
                         break;
                 }
         }
-        /*
-         * If no option could be set, return an error:
-         */
-        if (!trace_options[i])
-                return -EINVAL;
+
+        /* If no option could be set, test the specific tracer options */
+        if (!trace_options[i]) {
+                ret = set_tracer_option(current_trace, cmp, neg);
+                if (ret)
+                        return ret;
+        }
 
         filp->f_pos += cnt;
 
@@ -2271,8 +2878,8 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
 
 static struct file_operations tracing_iter_fops = {
         .open           = tracing_open_generic,
-        .read           = tracing_iter_ctrl_read,
-        .write          = tracing_iter_ctrl_write,
+        .read           = tracing_trace_options_read,
+        .write          = tracing_trace_options_write,
 };
 
 static const char readme_msg[] =
@@ -2286,9 +2893,9 @@ static const char readme_msg[] =
         "# echo sched_switch > /debug/tracing/current_tracer\n"
         "# cat /debug/tracing/current_tracer\n"
         "sched_switch\n"
-        "# cat /debug/tracing/iter_ctrl\n"
+        "# cat /debug/tracing/trace_options\n"
         "noprint-parent nosym-offset nosym-addr noverbose\n"
-        "# echo print-parent > /debug/tracing/iter_ctrl\n"
+        "# echo print-parent > /debug/tracing/trace_options\n"
         "# echo 1 > /debug/tracing/tracing_enabled\n"
         "# cat /debug/tracing/trace > /tmp/trace.txt\n"
         "echo 0 > /debug/tracing/tracing_enabled\n"
@@ -2311,11 +2918,10 @@ static ssize_t
 tracing_ctrl_read(struct file *filp, char __user *ubuf,
                   size_t cnt, loff_t *ppos)
 {
-        struct trace_array *tr = filp->private_data;
         char buf[64];
         int r;
 
-        r = sprintf(buf, "%ld\n", tr->ctrl);
+        r = sprintf(buf, "%u\n", tracer_enabled);
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
@@ -2343,16 +2949,18 @@ tracing_ctrl_write(struct file *filp, const char __user *ubuf,
         val = !!val;
 
         mutex_lock(&trace_types_lock);
-        if (tr->ctrl ^ val) {
-                if (val)
+        if (tracer_enabled ^ val) {
+                if (val) {
                         tracer_enabled = 1;
-                else
+                        if (current_trace->start)
+                                current_trace->start(tr);
+                        tracing_start();
+                } else {
                         tracer_enabled = 0;
-
-                tr->ctrl = val;
-
-                if (current_trace && current_trace->ctrl_update)
-                        current_trace->ctrl_update(tr);
+                        tracing_stop();
+                        if (current_trace->stop)
+                                current_trace->stop(tr);
+                }
         }
         mutex_unlock(&trace_types_lock);
 
@@ -2378,29 +2986,11 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf,
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
-static ssize_t
-tracing_set_trace_write(struct file *filp, const char __user *ubuf,
-                        size_t cnt, loff_t *ppos)
+static int tracing_set_tracer(char *buf)
 {
         struct trace_array *tr = &global_trace;
         struct tracer *t;
-        char buf[max_tracer_type_len+1];
-        int i;
-        size_t ret;
-
-        ret = cnt;
-
-        if (cnt > max_tracer_type_len)
-                cnt = max_tracer_type_len;
-
-        if (copy_from_user(&buf, ubuf, cnt))
-                return -EFAULT;
-
-        buf[cnt] = 0;
-
-        /* strip ending whitespace. */
-        for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
-                buf[i] = 0;
+        int ret = 0;
 
         mutex_lock(&trace_types_lock);
         for (t = trace_types; t; t = t->next) {
@@ -2414,18 +3004,52 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
         if (t == current_trace)
                 goto out;
 
+        trace_branch_disable();
         if (current_trace && current_trace->reset)
                 current_trace->reset(tr);
 
         current_trace = t;
-        if (t->init)
-                t->init(tr);
+        if (t->init) {
+                ret = t->init(tr);
+                if (ret)
+                        goto out;
+        }
 
+        trace_branch_enable(tr);
  out:
         mutex_unlock(&trace_types_lock);
 
-        if (ret > 0)
-                filp->f_pos += ret;
+        return ret;
+}
+
+static ssize_t
+tracing_set_trace_write(struct file *filp, const char __user *ubuf,
+                        size_t cnt, loff_t *ppos)
+{
+        char buf[max_tracer_type_len+1];
+        int i;
+        size_t ret;
+        int err;
+
+        ret = cnt;
+
+        if (cnt > max_tracer_type_len)
+                cnt = max_tracer_type_len;
+
+        if (copy_from_user(&buf, ubuf, cnt))
+                return -EFAULT;
+
+        buf[cnt] = 0;
+
+        /* strip ending whitespace. */
+        for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
+                buf[i] = 0;
+
+        err = tracing_set_tracer(buf);
+        if (err)
+                return err;
+
+        filp->f_pos += ret;
 
         return ret;
 }
@@ -2492,6 +3116,10 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
                 return -ENOMEM;
 
         mutex_lock(&trace_types_lock);
+
+        /* trace pipe does not show start of buffer */
+        cpus_setall(iter->started);
+
         iter->tr = &global_trace;
         iter->trace = current_trace;
         filp->private_data = iter;
@@ -2667,7 +3295,7 @@ tracing_entries_read(struct file *filp, char __user *ubuf,
         char buf[64];
         int r;
 
-        r = sprintf(buf, "%lu\n", tr->entries);
+        r = sprintf(buf, "%lu\n", tr->entries >> 10);
         return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
@@ -2678,7 +3306,6 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
         unsigned long val;
         char buf[64];
         int ret, cpu;
-        struct trace_array *tr = filp->private_data;
 
         if (cnt >= sizeof(buf))
                 return -EINVAL;
@@ -2698,12 +3325,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 
         mutex_lock(&trace_types_lock);
 
-        if (tr->ctrl) {
-                cnt = -EBUSY;
-                pr_info("ftrace: please disable tracing"
-                        " before modifying buffer size\n");
-                goto out;
-        }
+        tracing_stop();
 
         /* disable all cpu buffers */
         for_each_tracing_cpu(cpu) {
@@ -2713,6 +3335,9 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
                         atomic_inc(&max_tr.data[cpu]->disabled);
         }
 
+        /* value is in KB */
+        val <<= 10;
+
         if (val != global_trace.entries) {
                 ret = ring_buffer_resize(global_trace.buffer, val);
                 if (ret < 0) {
@@ -2751,6 +3376,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
                         atomic_dec(&max_tr.data[cpu]->disabled);
         }
 
+        tracing_start();
         max_tr.entries = global_trace.entries;
         mutex_unlock(&trace_types_lock);
 
@@ -2762,7 +3388,7 @@ static int mark_printk(const char *fmt, ...)
         int ret;
         va_list args;
         va_start(args, fmt);
-        ret = trace_vprintk(0, fmt, args);
+        ret = trace_vprintk(0, -1, fmt, args);
         va_end(args);
         return ret;
 }
@@ -2773,9 +3399,8 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 {
         char *buf;
         char *end;
-        struct trace_array *tr = &global_trace;
 
-        if (!tr->ctrl || tracing_disabled)
+        if (tracing_disabled)
                 return -EINVAL;
 
         if (cnt > TRACE_BUF_SIZE)
@@ -2841,22 +3466,38 @@ static struct file_operations tracing_mark_fops = {
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 
+int __weak ftrace_arch_read_dyn_info(char *buf, int size)
+{
+        return 0;
+}
+
 static ssize_t
-tracing_read_long(struct file *filp, char __user *ubuf,
+tracing_read_dyn_info(struct file *filp, char __user *ubuf,
                   size_t cnt, loff_t *ppos)
 {
+        static char ftrace_dyn_info_buffer[1024];
+        static DEFINE_MUTEX(dyn_info_mutex);
         unsigned long *p = filp->private_data;
-        char buf[64];
+        char *buf = ftrace_dyn_info_buffer;
+        int size = ARRAY_SIZE(ftrace_dyn_info_buffer);
         int r;
 
-        r = sprintf(buf, "%ld\n", *p);
+        mutex_lock(&dyn_info_mutex);
+        r = sprintf(buf, "%ld ", *p);
 
-        return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+        r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r);
+        buf[r++] = '\n';
+
+        r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+
+        mutex_unlock(&dyn_info_mutex);
+
+        return r;
 }
 
-static struct file_operations tracing_read_long_fops = {
+static struct file_operations tracing_dyn_info_fops = {
         .open           = tracing_open_generic,
-        .read           = tracing_read_long,
+        .read           = tracing_read_dyn_info,
 };
 #endif
 
@@ -2897,10 +3538,10 @@ static __init int tracer_init_debugfs(void)
         if (!entry)
                 pr_warning("Could not create debugfs 'tracing_enabled' entry\n");
 
-        entry = debugfs_create_file("iter_ctrl", 0644, d_tracer,
+        entry = debugfs_create_file("trace_options", 0644, d_tracer,
                                     NULL, &tracing_iter_fops);
         if (!entry)
-                pr_warning("Could not create debugfs 'iter_ctrl' entry\n");
+                pr_warning("Could not create debugfs 'trace_options' entry\n");
 
         entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
                                     NULL, &tracing_cpumask_fops);
@@ -2950,11 +3591,11 @@ static __init int tracer_init_debugfs(void)
                 pr_warning("Could not create debugfs "
                            "'trace_pipe' entry\n");
 
-        entry = debugfs_create_file("trace_entries", 0644, d_tracer,
+        entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer,
                                     &global_trace, &tracing_entries_fops);
         if (!entry)
                 pr_warning("Could not create debugfs "
-                           "'trace_entries' entry\n");
+                           "'buffer_size_kb' entry\n");
 
         entry = debugfs_create_file("trace_marker", 0220, d_tracer,
                                     NULL, &tracing_mark_fops);
@@ -2965,7 +3606,7 @@ static __init int tracer_init_debugfs(void)
 #ifdef CONFIG_DYNAMIC_FTRACE
         entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
                                     &ftrace_update_tot_cnt,
-                                    &tracing_read_long_fops);
+                                    &tracing_dyn_info_fops);
         if (!entry)
                 pr_warning("Could not create debugfs "
                            "'dyn_ftrace_total_info' entry\n");
@@ -2976,7 +3617,7 @@ static __init int tracer_init_debugfs(void)
         return 0;
 }
 
-int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
+int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
 {
         static DEFINE_SPINLOCK(trace_buf_lock);
         static char trace_buf[TRACE_BUF_SIZE];
@@ -2984,11 +3625,11 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
         struct ring_buffer_event *event;
         struct trace_array *tr = &global_trace;
         struct trace_array_cpu *data;
-        struct print_entry *entry;
-        unsigned long flags, irq_flags;
         int cpu, len = 0, size, pc;
+        struct print_entry *entry;
+        unsigned long irq_flags;
 
-        if (!tr->ctrl || tracing_disabled)
+        if (tracing_disabled || tracing_selftest_running)
                 return 0;
 
         pc = preempt_count();
@@ -2999,7 +3640,8 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
         if (unlikely(atomic_read(&data->disabled)))
                 goto out;
 
-        spin_lock_irqsave(&trace_buf_lock, flags);
+        pause_graph_tracing();
+        spin_lock_irqsave(&trace_buf_lock, irq_flags);
         len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
 
         len = min(len, TRACE_BUF_SIZE-1);
@@ -3010,17 +3652,18 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
         if (!event)
                 goto out_unlock;
         entry = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, flags, pc);
+        tracing_generic_entry_update(&entry->ent, irq_flags, pc);
         entry->ent.type                 = TRACE_PRINT;
         entry->ip                       = ip;
+        entry->depth                    = depth;
 
         memcpy(&entry->buf, trace_buf, len);
         entry->buf[len] = 0;
         ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 
  out_unlock:
-        spin_unlock_irqrestore(&trace_buf_lock, flags);
-
+        spin_unlock_irqrestore(&trace_buf_lock, irq_flags);
+        unpause_graph_tracing();
  out:
         preempt_enable_notrace();
 
@@ -3037,7 +3680,7 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
                 return 0;
 
         va_start(ap, fmt);
-        ret = trace_vprintk(ip, fmt, ap);
+        ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
         va_end(ap);
         return ret;
 }
@@ -3046,7 +3689,8 @@ EXPORT_SYMBOL_GPL(__ftrace_printk);
 static int trace_panic_handler(struct notifier_block *this,
                                unsigned long event, void *unused)
 {
-        ftrace_dump();
+        if (ftrace_dump_on_oops)
+                ftrace_dump();
         return NOTIFY_OK;
 }
 
@@ -3062,7 +3706,8 @@ static int trace_die_handler(struct notifier_block *self,
 {
         switch (val) {
         case DIE_OOPS:
-                ftrace_dump();
+                if (ftrace_dump_on_oops)
+                        ftrace_dump();
                 break;
         default:
                 break;
@@ -3103,7 +3748,6 @@ trace_printk_seq(struct trace_seq *s)
         trace_seq_reset(s);
 }
 
-
 void ftrace_dump(void)
 {
         static DEFINE_SPINLOCK(ftrace_dump_lock);
@@ -3128,6 +3772,9 @@ void ftrace_dump(void)
                 atomic_inc(&global_trace.data[cpu]->disabled);
         }
 
+        /* don't look at user memory in panic mode */
+        trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+
         printk(KERN_TRACE "Dumping ftrace buffer:\n");
 
         iter.tr = &global_trace;
@@ -3221,7 +3868,6 @@ __init static int tracer_alloc_buffers(void)
 #endif
 
         /* All seems OK, enable tracing */
-        global_trace.ctrl = tracer_enabled;
         tracing_disabled = 0;
 
         atomic_notifier_chain_register(&panic_notifier_list,
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8465ad052707..cc7a4f864036 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -8,6 +8,7 @@
 #include <linux/ring_buffer.h>
 #include <linux/mmiotrace.h>
 #include <linux/ftrace.h>
+#include <trace/boot.h>
 
 enum trace_type {
         __TRACE_FIRST_TYPE = 0,
@@ -21,7 +22,14 @@ enum trace_type {
         TRACE_SPECIAL,
         TRACE_MMIO_RW,
         TRACE_MMIO_MAP,
-        TRACE_BOOT,
+        TRACE_BRANCH,
+        TRACE_BOOT_CALL,
+        TRACE_BOOT_RET,
+        TRACE_GRAPH_RET,
+        TRACE_GRAPH_ENT,
+        TRACE_USER_STACK,
+        TRACE_HW_BRANCHES,
+        TRACE_POWER,
 
         __TRACE_LAST_TYPE
 };
@@ -38,6 +46,7 @@ struct trace_entry {
         unsigned char           flags;
         unsigned char           preempt_count;
         int                     pid;
+        int                     tgid;
 };
 
 /*
@@ -48,6 +57,18 @@ struct ftrace_entry {
         unsigned long           ip;
         unsigned long           parent_ip;
 };
+
+/* Function call entry */
+struct ftrace_graph_ent_entry {
+        struct trace_entry                      ent;
+        struct ftrace_graph_ent         graph_ent;
+};
+
+/* Function return entry */
+struct ftrace_graph_ret_entry {
+        struct trace_entry                      ent;
+        struct ftrace_graph_ret         ret;
+};
 extern struct tracer boot_tracer;
 
 /*
@@ -85,12 +106,18 @@ struct stack_entry {
         unsigned long           caller[FTRACE_STACK_ENTRIES];
 };
 
+struct userstack_entry {
+        struct trace_entry      ent;
+        unsigned long           caller[FTRACE_STACK_ENTRIES];
+};
+
 /*
  * ftrace_printk entry:
  */
 struct print_entry {
         struct trace_entry      ent;
         unsigned long           ip;
+        int                     depth;
         char                    buf[];
 };
 
@@ -112,9 +139,35 @@ struct trace_mmiotrace_map {
         struct mmiotrace_map    map;
 };
 
-struct trace_boot {
+struct trace_boot_call {
         struct trace_entry      ent;
-        struct boot_trace       initcall;
+        struct boot_trace_call boot_call;
+};
+
+struct trace_boot_ret {
+        struct trace_entry      ent;
+        struct boot_trace_ret boot_ret;
+};
+
+#define TRACE_FUNC_SIZE 30
+#define TRACE_FILE_SIZE 20
+struct trace_branch {
+        struct trace_entry      ent;
+        unsigned                line;
+        char                    func[TRACE_FUNC_SIZE+1];
+        char                    file[TRACE_FILE_SIZE+1];
+        char                    correct;
+};
+
+struct hw_branch_entry {
+        struct trace_entry      ent;
+        u64                     from;
+        u64                     to;
+};
+
+struct trace_power {
+        struct trace_entry      ent;
+        struct power_trace      state_data;
 };
 
 /*
@@ -172,7 +225,6 @@ struct trace_iterator;
 struct trace_array {
         struct ring_buffer      *buffer;
         unsigned long           entries;
-        long                    ctrl;
         int                     cpu;
         cycle_t                 time_start;
         struct task_struct      *waiter;
@@ -212,13 +264,22 @@ extern void __ftrace_bad_type(void);
                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
                 IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
+                IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
                           TRACE_MMIO_RW);                               \
                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
                           TRACE_MMIO_MAP);                              \
-                IF_ASSIGN(var, ent, struct trace_boot, TRACE_BOOT);     \
+                IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
+                IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
+                IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
+                IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
+                          TRACE_GRAPH_ENT);             \
+                IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
+                          TRACE_GRAPH_RET);             \
+                IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
+                IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
                 __ftrace_bad_type();                                    \
         } while (0)
 
@@ -229,29 +290,56 @@ enum print_line_t {
         TRACE_TYPE_UNHANDLED    = 2     /* Relay to other output functions */
 };
 
+
+/*
+ * An option specific to a tracer. This is a boolean value.
+ * The bit is the bit index that sets its value on the
+ * flags value in struct tracer_flags.
+ */
+struct tracer_opt {
+        const char      *name; /* Will appear on the trace_options file */
+        u32             bit; /* Mask assigned in val field in tracer_flags */
+};
+
+/*
+ * The set of specific options for a tracer. Your tracer
+ * have to set the initial value of the flags val.
+ */
+struct tracer_flags {
+        u32                     val;
+        struct tracer_opt       *opts;
+};
+
+/* Makes more easy to define a tracer opt */
+#define TRACER_OPT(s, b)        .name = #s, .bit = b
+
 /*
  * A specific tracer, represented by methods that operate on a trace array:
  */
 struct tracer {
         const char              *name;
-        void                    (*init)(struct trace_array *tr);
+        /* Your tracer should raise a warning if init fails */
+        int                     (*init)(struct trace_array *tr);
         void                    (*reset)(struct trace_array *tr);
+        void                    (*start)(struct trace_array *tr);
+        void                    (*stop)(struct trace_array *tr);
         void                    (*open)(struct trace_iterator *iter);
         void                    (*pipe_open)(struct trace_iterator *iter);
         void                    (*close)(struct trace_iterator *iter);
-        void                    (*start)(struct trace_iterator *iter);
-        void                    (*stop)(struct trace_iterator *iter);
         ssize_t                 (*read)(struct trace_iterator *iter,
                                         struct file *filp, char __user *ubuf,
                                         size_t cnt, loff_t *ppos);
-        void                    (*ctrl_update)(struct trace_array *tr);
 #ifdef CONFIG_FTRACE_STARTUP_TEST
         int                     (*selftest)(struct tracer *trace,
                                             struct trace_array *tr);
 #endif
+        void                    (*print_header)(struct seq_file *m);
         enum print_line_t       (*print_line)(struct trace_iterator *iter);
+        /* If you handled the flag setting, return 0 */
+        int                     (*set_flag)(u32 old_flags, u32 bit, int set);
         struct tracer           *next;
         int                     print_max;
+        struct tracer_flags     *flags;
 };
 
 struct trace_seq {
@@ -279,10 +367,14 @@ struct trace_iterator {
         unsigned long           iter_flags;
         loff_t                  pos;
         long                    idx;
+
+        cpumask_t               started;
 };
 
+int tracing_is_enabled(void);
 void trace_wake_up(void);
 void tracing_reset(struct trace_array *tr, int cpu);
+void tracing_reset_online_cpus(struct trace_array *tr);
 int tracing_open_generic(struct inode *inode, struct file *filp);
 struct dentry *tracing_init_dentry(void);
 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
@@ -321,8 +413,15 @@ void trace_function(struct trace_array *tr,
                     unsigned long parent_ip,
                     unsigned long flags, int pc);
 
+void trace_graph_return(struct ftrace_graph_ret *trace);
+int trace_graph_entry(struct ftrace_graph_ent *trace);
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
+
 void tracing_start_cmdline_record(void);
 void tracing_stop_cmdline_record(void);
+void tracing_sched_switch_assign_trace(struct trace_array *tr);
+void tracing_stop_sched_switch_record(void);
+void tracing_start_sched_switch_record(void);
 int register_tracer(struct tracer *type);
 void unregister_tracer(struct tracer *type);
 
@@ -358,6 +457,7 @@ struct tracer_switch_ops {
         struct tracer_switch_ops        *next;
 };
 
+char *trace_find_cmdline(int pid);
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -383,19 +483,79 @@ extern int trace_selftest_startup_sched_switch(struct tracer *trace,
                                                struct trace_array *tr);
 extern int trace_selftest_startup_sysprof(struct tracer *trace,
                                                struct trace_array *tr);
+extern int trace_selftest_startup_branch(struct tracer *trace,
+                                         struct trace_array *tr);
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
 extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
 extern void trace_seq_print_cont(struct trace_seq *s,
                                  struct trace_iterator *iter);
+
+extern int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
+                unsigned long sym_flags);
 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
                                  size_t cnt);
 extern long ns2usecs(cycle_t nsec);
-extern int trace_vprintk(unsigned long ip, const char *fmt, va_list args);
+extern int
+trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args);
 
 extern unsigned long trace_flags;
 
+/* Standard output formatting function used for function return traces */
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+extern enum print_line_t print_graph_function(struct trace_iterator *iter);
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+/* TODO: make this variable */
+#define FTRACE_GRAPH_MAX_FUNCS          32
+extern int ftrace_graph_count;
+extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
+
+static inline int ftrace_graph_addr(unsigned long addr)
+{
+        int i;
+
+        if (!ftrace_graph_count || test_tsk_trace_graph(current))
+                return 1;
+
+        for (i = 0; i < ftrace_graph_count; i++) {
+                if (addr == ftrace_graph_funcs[i])
+                        return 1;
+        }
+
+        return 0;
+}
+#else
+static inline int ftrace_trace_addr(unsigned long addr)
+{
+        return 1;
+}
+static inline int ftrace_graph_addr(unsigned long addr)
+{
+        return 1;
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
+#else /* CONFIG_FUNCTION_GRAPH_TRACER */
+static inline enum print_line_t
+print_graph_function(struct trace_iterator *iter)
+{
+        return TRACE_TYPE_UNHANDLED;
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+extern struct pid *ftrace_pid_trace;
+
+static inline int ftrace_trace_task(struct task_struct *task)
+{
+        if (!ftrace_pid_trace)
+                return 1;
+
+        return test_tsk_trace_trace(task);
+}
+
 /*
  * trace_iterator_flags is an enumeration that defines bit
  * positions into trace_flags that controls the output.
@@ -415,8 +575,93 @@ enum trace_iterator_flags {
         TRACE_ITER_STACKTRACE           = 0x100,
         TRACE_ITER_SCHED_TREE           = 0x200,
         TRACE_ITER_PRINTK               = 0x400,
+        TRACE_ITER_PREEMPTONLY          = 0x800,
+        TRACE_ITER_BRANCH               = 0x1000,
+        TRACE_ITER_ANNOTATE             = 0x2000,
+        TRACE_ITER_USERSTACKTRACE       = 0x4000,
+        TRACE_ITER_SYM_USEROBJ          = 0x8000,
+        TRACE_ITER_PRINTK_MSGONLY       = 0x10000
 };
 
+/*
+ * TRACE_ITER_SYM_MASK masks the options in trace_flags that
+ * control the output of kernel symbols.
+ */
+#define TRACE_ITER_SYM_MASK \
+        (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
+
 extern struct tracer nop_trace;
 
+/**
+ * ftrace_preempt_disable - disable preemption scheduler safe
+ *
+ * When tracing can happen inside the scheduler, there exists
+ * cases that the tracing might happen before the need_resched
+ * flag is checked. If this happens and the tracer calls
+ * preempt_enable (after a disable), a schedule might take place
+ * causing an infinite recursion.
+ *
+ * To prevent this, we read the need_recshed flag before
+ * disabling preemption. When we want to enable preemption we
+ * check the flag, if it is set, then we call preempt_enable_no_resched.
+ * Otherwise, we call preempt_enable.
+ *
+ * The rational for doing the above is that if need resched is set
+ * and we have yet to reschedule, we are either in an atomic location
+ * (where we do not need to check for scheduling) or we are inside
+ * the scheduler and do not want to resched.
+ */
+static inline int ftrace_preempt_disable(void)
+{
+        int resched;
+
+        resched = need_resched();
+        preempt_disable_notrace();
+
+        return resched;
+}
+
+/**
+ * ftrace_preempt_enable - enable preemption scheduler safe
+ * @resched: the return value from ftrace_preempt_disable
+ *
+ * This is a scheduler safe way to enable preemption and not miss
+ * any preemption checks. The disabled saved the state of preemption.
+ * If resched is set, then we were either inside an atomic or
+ * are inside the scheduler (we would have already scheduled
+ * otherwise). In this case, we do not want to call normal
+ * preempt_enable, but preempt_enable_no_resched instead.
+ */
+static inline void ftrace_preempt_enable(int resched)
+{
+        if (resched)
+                preempt_enable_no_resched_notrace();
+        else
+                preempt_enable_notrace();
+}
+
+#ifdef CONFIG_BRANCH_TRACER
+extern int enable_branch_tracing(struct trace_array *tr);
+extern void disable_branch_tracing(void);
+static inline int trace_branch_enable(struct trace_array *tr)
+{
+        if (trace_flags & TRACE_ITER_BRANCH)
+                return enable_branch_tracing(tr);
+        return 0;
+}
+static inline void trace_branch_disable(void)
+{
+        /* due to races, always disable */
+        disable_branch_tracing();
+}
+#else
+static inline int trace_branch_enable(struct trace_array *tr)
+{
+        return 0;
+}
+static inline void trace_branch_disable(void)
+{
+}
+#endif /* CONFIG_BRANCH_TRACER */
+
 #endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index d0a5e50eeff2..3ccebde28482 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -13,101 +13,161 @@
 #include "trace.h"
 
 static struct trace_array *boot_trace;
-static int trace_boot_enabled;
+static bool pre_initcalls_finished;
 
-
-/* Should be started after do_pre_smp_initcalls() in init/main.c */
+/* Tells the boot tracer that the pre_smp_initcalls are finished.
+ * So we are ready .
+ * It doesn't enable sched events tracing however.
+ * You have to call enable_boot_trace to do so.
+ */
 void start_boot_trace(void)
 {
-        trace_boot_enabled = 1;
+        pre_initcalls_finished = true;
 }
 
-void stop_boot_trace(void)
+void enable_boot_trace(void)
 {
-        trace_boot_enabled = 0;
+        if (pre_initcalls_finished)
+                tracing_start_sched_switch_record();
 }
 
-void reset_boot_trace(struct trace_array *tr)
+void disable_boot_trace(void)
 {
-        stop_boot_trace();
+        if (pre_initcalls_finished)
+                tracing_stop_sched_switch_record();
 }
 
-static void boot_trace_init(struct trace_array *tr)
+static int boot_trace_init(struct trace_array *tr)
 {
         int cpu;
         boot_trace = tr;
 
-        trace_boot_enabled = 0;
-
         for_each_cpu_mask(cpu, cpu_possible_map)
                 tracing_reset(tr, cpu);
+
+        tracing_sched_switch_assign_trace(tr);
+        return 0;
 }
 
-static void boot_trace_ctrl_update(struct trace_array *tr)
+static enum print_line_t
+initcall_call_print_line(struct trace_iterator *iter)
 {
-        if (tr->ctrl)
-                start_boot_trace();
+        struct trace_entry *entry = iter->ent;
+        struct trace_seq *s = &iter->seq;
+        struct trace_boot_call *field;
+        struct boot_trace_call *call;
+        u64 ts;
+        unsigned long nsec_rem;
+        int ret;
+
+        trace_assign_type(field, entry);
+        call = &field->boot_call;
+        ts = iter->ts;
+        nsec_rem = do_div(ts, 1000000000);
+
+        ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
+                        (unsigned long)ts, nsec_rem, call->func, call->caller);
+
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
         else
-                stop_boot_trace();
+                return TRACE_TYPE_HANDLED;
 }
 
-static enum print_line_t initcall_print_line(struct trace_iterator *iter)
+static enum print_line_t
+initcall_ret_print_line(struct trace_iterator *iter)
 {
-        int ret;
         struct trace_entry *entry = iter->ent;
-        struct trace_boot *field = (struct trace_boot *)entry;
-        struct boot_trace *it = &field->initcall;
         struct trace_seq *s = &iter->seq;
-        struct timespec calltime = ktime_to_timespec(it->calltime);
-        struct timespec rettime = ktime_to_timespec(it->rettime);
-
-        if (entry->type == TRACE_BOOT) {
-                ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
-                                          calltime.tv_sec,
-                                          calltime.tv_nsec,
-                                          it->func, it->caller);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-
-                ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
-                                          "returned %d after %lld msecs\n",
-                                          rettime.tv_sec,
-                                          rettime.tv_nsec,
-                                          it->func, it->result, it->duration);
-
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
+        struct trace_boot_ret *field;
+        struct boot_trace_ret *init_ret;
+        u64 ts;
+        unsigned long nsec_rem;
+        int ret;
+
+        trace_assign_type(field, entry);
+        init_ret = &field->boot_ret;
+        ts = iter->ts;
+        nsec_rem = do_div(ts, 1000000000);
+
+        ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
+                        "returned %d after %llu msecs\n",
+                        (unsigned long) ts,
+                        nsec_rem,
+                        init_ret->func, init_ret->result, init_ret->duration);
+
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+        else
                 return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t initcall_print_line(struct trace_iterator *iter)
+{
+        struct trace_entry *entry = iter->ent;
+
+        switch (entry->type) {
+        case TRACE_BOOT_CALL:
+                return initcall_call_print_line(iter);
+        case TRACE_BOOT_RET:
+                return initcall_ret_print_line(iter);
+        default:
+                return TRACE_TYPE_UNHANDLED;
         }
-        return TRACE_TYPE_UNHANDLED;
 }
 
 struct tracer boot_tracer __read_mostly =
 {
         .name           = "initcall",
         .init           = boot_trace_init,
-        .reset          = reset_boot_trace,
-        .ctrl_update    = boot_trace_ctrl_update,
+        .reset          = tracing_reset_online_cpus,
         .print_line     = initcall_print_line,
 };
 
-void trace_boot(struct boot_trace *it, initcall_t fn)
+void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
 {
         struct ring_buffer_event *event;
-        struct trace_boot *entry;
-        struct trace_array_cpu *data;
+        struct trace_boot_call *entry;
         unsigned long irq_flags;
         struct trace_array *tr = boot_trace;
 
-        if (!trace_boot_enabled)
+        if (!pre_initcalls_finished)
                 return;
 
         /* Get its name now since this function could
          * disappear because it is in the .init section.
          */
-        sprint_symbol(it->func, (unsigned long)fn);
+        sprint_symbol(bt->func, (unsigned long)fn);
+        preempt_disable();
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                goto out;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, 0, 0);
+        entry->ent.type = TRACE_BOOT_CALL;
+        entry->boot_call = *bt;
+        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+        trace_wake_up();
+
+ out:
+        preempt_enable();
+}
+
+void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
+{
+        struct ring_buffer_event *event;
+        struct trace_boot_ret *entry;
+        unsigned long irq_flags;
+        struct trace_array *tr = boot_trace;
+
+        if (!pre_initcalls_finished)
+                return;
+
+        sprint_symbol(bt->func, (unsigned long)fn);
         preempt_disable();
-        data = tr->data[smp_processor_id()];
 
         event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
                                          &irq_flags);
@@ -115,8 +175,8 @@ void trace_boot(struct boot_trace *it, initcall_t fn)
                 goto out;
         entry   = ring_buffer_event_data(event);
         tracing_generic_entry_update(&entry->ent, 0, 0);
-        entry->ent.type = TRACE_BOOT;
-        entry->initcall = *it;
+        entry->ent.type = TRACE_BOOT_RET;
+        entry->boot_ret = *bt;
         ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 
         trace_wake_up();
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
new file mode 100644
index 000000000000..6c00feb3bac7
--- /dev/null
+++ b/kernel/trace/trace_branch.c
@@ -0,0 +1,342 @@
+/*
+ * unlikely profiler
+ *
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/kallsyms.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/irqflags.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/ftrace.h>
+#include <linux/hash.h>
+#include <linux/fs.h>
+#include <asm/local.h>
+#include "trace.h"
+
+#ifdef CONFIG_BRANCH_TRACER
+
+static int branch_tracing_enabled __read_mostly;
+static DEFINE_MUTEX(branch_tracing_mutex);
+static struct trace_array *branch_tracer;
+
+static void
+probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
+{
+        struct trace_array *tr = branch_tracer;
+        struct ring_buffer_event *event;
+        struct trace_branch *entry;
+        unsigned long flags, irq_flags;
+        int cpu, pc;
+        const char *p;
+
+        /*
+         * I would love to save just the ftrace_likely_data pointer, but
+         * this code can also be used by modules. Ugly things can happen
+         * if the module is unloaded, and then we go and read the
+         * pointer.  This is slower, but much safer.
+         */
+
+        if (unlikely(!tr))
+                return;
+
+        local_irq_save(flags);
+        cpu = raw_smp_processor_id();
+        if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
+                goto out;
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                goto out;
+
+        pc = preempt_count();
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, flags, pc);
+        entry->ent.type         = TRACE_BRANCH;
+
+        /* Strip off the path, only save the file */
+        p = f->file + strlen(f->file);
+        while (p >= f->file && *p != '/')
+                p--;
+        p++;
+
+        strncpy(entry->func, f->func, TRACE_FUNC_SIZE);
+        strncpy(entry->file, p, TRACE_FILE_SIZE);
+        entry->func[TRACE_FUNC_SIZE] = 0;
+        entry->file[TRACE_FILE_SIZE] = 0;
+        entry->line = f->line;
+        entry->correct = val == expect;
+
+        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ out:
+        atomic_dec(&tr->data[cpu]->disabled);
+        local_irq_restore(flags);
+}
+
+static inline
+void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
+{
+        if (!branch_tracing_enabled)
+                return;
+
+        probe_likely_condition(f, val, expect);
+}
+
+int enable_branch_tracing(struct trace_array *tr)
+{
+        int ret = 0;
+
+        mutex_lock(&branch_tracing_mutex);
+        branch_tracer = tr;
+        /*
+         * Must be seen before enabling. The reader is a condition
+         * where we do not need a matching rmb()
+         */
+        smp_wmb();
+        branch_tracing_enabled++;
+        mutex_unlock(&branch_tracing_mutex);
+
+        return ret;
+}
+
+void disable_branch_tracing(void)
+{
+        mutex_lock(&branch_tracing_mutex);
+
+        if (!branch_tracing_enabled)
+                goto out_unlock;
+
+        branch_tracing_enabled--;
+
+ out_unlock:
+        mutex_unlock(&branch_tracing_mutex);
+}
+
+static void start_branch_trace(struct trace_array *tr)
+{
+        enable_branch_tracing(tr);
+}
+
+static void stop_branch_trace(struct trace_array *tr)
+{
+        disable_branch_tracing();
+}
+
+static int branch_trace_init(struct trace_array *tr)
+{
+        int cpu;
+
+        for_each_online_cpu(cpu)
+                tracing_reset(tr, cpu);
+
+        start_branch_trace(tr);
+        return 0;
+}
+
+static void branch_trace_reset(struct trace_array *tr)
+{
+        stop_branch_trace(tr);
+}
+
+struct tracer branch_trace __read_mostly =
+{
+        .name           = "branch",
+        .init           = branch_trace_init,
+        .reset          = branch_trace_reset,
+#ifdef CONFIG_FTRACE_SELFTEST
+        .selftest       = trace_selftest_startup_branch,
+#endif
+};
+
+__init static int init_branch_trace(void)
+{
+        return register_tracer(&branch_trace);
+}
+
+device_initcall(init_branch_trace);
+#else
+static inline
+void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
+{
+}
+#endif /* CONFIG_BRANCH_TRACER */
+
+void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect)
+{
+        /*
+         * I would love to have a trace point here instead, but the
+         * trace point code is so inundated with unlikely and likely
+         * conditions that the recursive nightmare that exists is too
+         * much to try to get working. At least for now.
+         */
+        trace_likely_condition(f, val, expect);
+
+        /* FIXME: Make this atomic! */
+        if (val == expect)
+                f->correct++;
+        else
+                f->incorrect++;
+}
+EXPORT_SYMBOL(ftrace_likely_update);
+
+struct ftrace_pointer {
+        void            *start;
+        void            *stop;
+        int             hit;
+};
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        const struct ftrace_pointer *f = m->private;
+        struct ftrace_branch_data *p = v;
+
+        (*pos)++;
+
+        if (v == (void *)1)
+                return f->start;
+
+        ++p;
+
+        if ((void *)p >= (void *)f->stop)
+                return NULL;
+
+        return p;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+        void *t = (void *)1;
+        loff_t l = 0;
+
+        for (; t && l < *pos; t = t_next(m, t, &l))
+                ;
+
+        return t;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+        const struct ftrace_pointer *fp = m->private;
+        struct ftrace_branch_data *p = v;
+        const char *f;
+        long percent;
+
+        if (v == (void *)1) {
+                if (fp->hit)
+                        seq_printf(m, "   miss      hit    %% ");
+                else
+                        seq_printf(m, " correct incorrect  %% ");
+                seq_printf(m, "       Function                "
+                              "  File              Line\n"
+                              " ------- ---------  - "
+                              "       --------                "
+                              "  ----              ----\n");
+                return 0;
+        }
+
+        /* Only print the file, not the path */
+        f = p->file + strlen(p->file);
+        while (f >= p->file && *f != '/')
+                f--;
+        f++;
+
+        /*
+         * The miss is overlayed on correct, and hit on incorrect.
+         */
+        if (p->correct) {
+                percent = p->incorrect * 100;
+                percent /= p->correct + p->incorrect;
+        } else
+                percent = p->incorrect ? 100 : -1;
+
+        seq_printf(m, "%8lu %8lu ",  p->correct, p->incorrect);
+        if (percent < 0)
+                seq_printf(m, "  X ");
+        else
+                seq_printf(m, "%3ld ", percent);
+        seq_printf(m, "%-30.30s %-20.20s %d\n", p->func, f, p->line);
+        return 0;
+}
+
+static struct seq_operations tracing_likely_seq_ops = {
+        .start          = t_start,
+        .next           = t_next,
+        .stop           = t_stop,
+        .show           = t_show,
+};
+
+static int tracing_branch_open(struct inode *inode, struct file *file)
+{
+        int ret;
+
+        ret = seq_open(file, &tracing_likely_seq_ops);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+                m->private = (void *)inode->i_private;
+        }
+
+        return ret;
+}
+
+static const struct file_operations tracing_branch_fops = {
+        .open           = tracing_branch_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+};
+
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
+extern unsigned long __start_branch_profile[];
+extern unsigned long __stop_branch_profile[];
+
+static const struct ftrace_pointer ftrace_branch_pos = {
+        .start                  = __start_branch_profile,
+        .stop                   = __stop_branch_profile,
+        .hit                    = 1,
+};
+
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
+
+extern unsigned long __start_annotated_branch_profile[];
+extern unsigned long __stop_annotated_branch_profile[];
+
+static const struct ftrace_pointer ftrace_annotated_branch_pos = {
+        .start                  = __start_annotated_branch_profile,
+        .stop                   = __stop_annotated_branch_profile,
+};
+
+static __init int ftrace_branch_init(void)
+{
+        struct dentry *d_tracer;
+        struct dentry *entry;
+
+        d_tracer = tracing_init_dentry();
+
+        entry = debugfs_create_file("profile_annotated_branch", 0444, d_tracer,
+                                    (void *)&ftrace_annotated_branch_pos,
+                                    &tracing_branch_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs "
+                           "'profile_annotatet_branch' entry\n");
+
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
+        entry = debugfs_create_file("profile_branch", 0444, d_tracer,
+                                    (void *)&ftrace_branch_pos,
+                                    &tracing_branch_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs"
+                           " 'profile_branch' entry\n");
+#endif
+
+        return 0;
+}
+
+device_initcall(ftrace_branch_init);
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 0f85a64003d3..9236d7e25a16 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -16,20 +16,10 @@
 
 #include "trace.h"
 
-static void function_reset(struct trace_array *tr)
-{
-        int cpu;
-
-        tr->time_start = ftrace_now(tr->cpu);
-
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
-}
-
 static void start_function_trace(struct trace_array *tr)
 {
         tr->cpu = get_cpu();
-        function_reset(tr);
+        tracing_reset_online_cpus(tr);
         put_cpu();
 
         tracing_start_cmdline_record();
@@ -42,24 +32,20 @@ static void stop_function_trace(struct trace_array *tr)
         tracing_stop_cmdline_record();
 }
 
-static void function_trace_init(struct trace_array *tr)
+static int function_trace_init(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                start_function_trace(tr);
+        start_function_trace(tr);
+        return 0;
 }
 
 static void function_trace_reset(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                stop_function_trace(tr);
+        stop_function_trace(tr);
 }
 
-static void function_trace_ctrl_update(struct trace_array *tr)
+static void function_trace_start(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                start_function_trace(tr);
-        else
-                stop_function_trace(tr);
+        tracing_reset_online_cpus(tr);
 }
 
 static struct tracer function_trace __read_mostly =
@@ -67,7 +53,7 @@ static struct tracer function_trace __read_mostly =
         .name        = "function",
         .init        = function_trace_init,
         .reset       = function_trace_reset,
-        .ctrl_update = function_trace_ctrl_update,
+        .start       = function_trace_start,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_function,
 #endif
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
new file mode 100644
index 000000000000..4bf39fcae97a
--- /dev/null
+++ b/kernel/trace/trace_functions_graph.c
@@ -0,0 +1,669 @@
+/*
+ *
+ * Function graph tracer.
+ * Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Mostly borrowed from function tracer which
+ * is Copyright (c) Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/ftrace.h>
+#include <linux/fs.h>
+
+#include "trace.h"
+
+#define TRACE_GRAPH_INDENT      2
+
+/* Flag options */
+#define TRACE_GRAPH_PRINT_OVERRUN       0x1
+#define TRACE_GRAPH_PRINT_CPU           0x2
+#define TRACE_GRAPH_PRINT_OVERHEAD      0x4
+#define TRACE_GRAPH_PRINT_PROC          0x8
+
+static struct tracer_opt trace_opts[] = {
+        /* Display overruns ? */
+        { TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
+        /* Display CPU ? */
+        { TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
+        /* Display Overhead ? */
+        { TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
+        /* Display proc name/pid */
+        { TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
+        { } /* Empty entry */
+};
+
+static struct tracer_flags tracer_flags = {
+        /* Don't display overruns and proc by default */
+        .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
+        .opts = trace_opts
+};
+
+/* pid on the last trace processed */
+static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
+
+static int graph_trace_init(struct trace_array *tr)
+{
+        int cpu, ret;
+
+        for_each_online_cpu(cpu)
+                tracing_reset(tr, cpu);
+
+        ret = register_ftrace_graph(&trace_graph_return,
+                                        &trace_graph_entry);
+        if (ret)
+                return ret;
+        tracing_start_cmdline_record();
+
+        return 0;
+}
+
+static void graph_trace_reset(struct trace_array *tr)
+{
+        tracing_stop_cmdline_record();
+        unregister_ftrace_graph();
+}
+
+static inline int log10_cpu(int nb)
+{
+        if (nb / 100)
+                return 3;
+        if (nb / 10)
+                return 2;
+        return 1;
+}
+
+static enum print_line_t
+print_graph_cpu(struct trace_seq *s, int cpu)
+{
+        int i;
+        int ret;
+        int log10_this = log10_cpu(cpu);
+        int log10_all = log10_cpu(cpus_weight_nr(cpu_online_map));
+
+
+        /*
+         * Start with a space character - to make it stand out
+         * to the right a bit when trace output is pasted into
+         * email:
+         */
+        ret = trace_seq_printf(s, " ");
+
+        /*
+         * Tricky - we space the CPU field according to the max
+         * number of online CPUs. On a 2-cpu system it would take
+         * a maximum of 1 digit - on a 128 cpu system it would
+         * take up to 3 digits:
+         */
+        for (i = 0; i < log10_all - log10_this; i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+        ret = trace_seq_printf(s, "%d) ", cpu);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+#define TRACE_GRAPH_PROCINFO_LENGTH     14
+
+static enum print_line_t
+print_graph_proc(struct trace_seq *s, pid_t pid)
+{
+        int i;
+        int ret;
+        int len;
+        char comm[8];
+        int spaces = 0;
+        /* sign + log10(MAX_INT) + '\0' */
+        char pid_str[11];
+
+        strncpy(comm, trace_find_cmdline(pid), 7);
+        comm[7] = '\0';
+        sprintf(pid_str, "%d", pid);
+
+        /* 1 stands for the "-" character */
+        len = strlen(comm) + strlen(pid_str) + 1;
+
+        if (len < TRACE_GRAPH_PROCINFO_LENGTH)
+                spaces = TRACE_GRAPH_PROCINFO_LENGTH - len;
+
+        /* First spaces to align center */
+        for (i = 0; i < spaces / 2; i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        ret = trace_seq_printf(s, "%s-%s", comm, pid_str);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Last spaces to align center */
+        for (i = 0; i < spaces - (spaces / 2); i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+        return TRACE_TYPE_HANDLED;
+}
+
+
+/* If the pid changed since the last trace, output this event */
+static enum print_line_t
+verif_pid(struct trace_seq *s, pid_t pid, int cpu)
+{
+        pid_t prev_pid;
+        int ret;
+
+        if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
+                return TRACE_TYPE_HANDLED;
+
+        prev_pid = last_pid[cpu];
+        last_pid[cpu] = pid;
+
+/*
+ * Context-switch trace line:
+
+ ------------------------------------------
+ | 1)  migration/0--1  =>  sshd-1755
+ ------------------------------------------
+
+ */
+        ret = trace_seq_printf(s,
+                " ------------------------------------------\n");
+        if (!ret)
+                TRACE_TYPE_PARTIAL_LINE;
+
+        ret = print_graph_cpu(s, cpu);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                TRACE_TYPE_PARTIAL_LINE;
+
+        ret = print_graph_proc(s, prev_pid);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                TRACE_TYPE_PARTIAL_LINE;
+
+        ret = trace_seq_printf(s, " => ");
+        if (!ret)
+                TRACE_TYPE_PARTIAL_LINE;
+
+        ret = print_graph_proc(s, pid);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                TRACE_TYPE_PARTIAL_LINE;
+
+        ret = trace_seq_printf(s,
+                "\n ------------------------------------------\n\n");
+        if (!ret)
+                TRACE_TYPE_PARTIAL_LINE;
+
+        return ret;
+}
+
+static bool
+trace_branch_is_leaf(struct trace_iterator *iter,
+                struct ftrace_graph_ent_entry *curr)
+{
+        struct ring_buffer_iter *ring_iter;
+        struct ring_buffer_event *event;
+        struct ftrace_graph_ret_entry *next;
+
+        ring_iter = iter->buffer_iter[iter->cpu];
+
+        if (!ring_iter)
+                return false;
+
+        event = ring_buffer_iter_peek(ring_iter, NULL);
+
+        if (!event)
+                return false;
+
+        next = ring_buffer_event_data(event);
+
+        if (next->ent.type != TRACE_GRAPH_RET)
+                return false;
+
+        if (curr->ent.pid != next->ent.pid ||
+                        curr->graph_ent.func != next->ret.func)
+                return false;
+
+        return true;
+}
+
+static enum print_line_t
+print_graph_irq(struct trace_seq *s, unsigned long addr,
+                                enum trace_type type, int cpu, pid_t pid)
+{
+        int ret;
+
+        if (addr < (unsigned long)__irqentry_text_start ||
+                addr >= (unsigned long)__irqentry_text_end)
+                return TRACE_TYPE_UNHANDLED;
+
+        if (type == TRACE_GRAPH_ENT) {
+                ret = trace_seq_printf(s, "==========> |  ");
+        } else {
+                /* Cpu */
+                if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+                        ret = print_graph_cpu(s, cpu);
+                        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
+                /* Proc */
+                if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+                        ret = print_graph_proc(s, pid);
+                        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                                return TRACE_TYPE_PARTIAL_LINE;
+
+                        ret = trace_seq_printf(s, " | ");
+                        if (!ret)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
+
+                /* No overhead */
+                if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                        ret = trace_seq_printf(s, "  ");
+                        if (!ret)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
+
+                ret = trace_seq_printf(s, "<========== |\n");
+        }
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_duration(unsigned long long duration, struct trace_seq *s)
+{
+        unsigned long nsecs_rem = do_div(duration, 1000);
+        /* log10(ULONG_MAX) + '\0' */
+        char msecs_str[21];
+        char nsecs_str[5];
+        int ret, len;
+        int i;
+
+        sprintf(msecs_str, "%lu", (unsigned long) duration);
+
+        /* Print msecs */
+        ret = trace_seq_printf(s, msecs_str);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        len = strlen(msecs_str);
+
+        /* Print nsecs (we don't want to exceed 7 numbers) */
+        if (len < 7) {
+                snprintf(nsecs_str, 8 - len, "%03lu", nsecs_rem);
+                ret = trace_seq_printf(s, ".%s", nsecs_str);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                len += strlen(nsecs_str);
+        }
+
+        ret = trace_seq_printf(s, " us ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Print remaining spaces to fit the row's width */
+        for (i = len; i < 7; i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        ret = trace_seq_printf(s, "|  ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+        return TRACE_TYPE_HANDLED;
+
+}
+
+/* Signal a overhead of time execution to the output */
+static int
+print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+{
+        /* Duration exceeded 100 msecs */
+        if (duration > 100000ULL)
+                return trace_seq_printf(s, "! ");
+
+        /* Duration exceeded 10 msecs */
+        if (duration > 10000ULL)
+                return trace_seq_printf(s, "+ ");
+
+        return trace_seq_printf(s, "  ");
+}
+
+/* Case of a leaf function on its call entry */
+static enum print_line_t
+print_graph_entry_leaf(struct trace_iterator *iter,
+                struct ftrace_graph_ent_entry *entry, struct trace_seq *s)
+{
+        struct ftrace_graph_ret_entry *ret_entry;
+        struct ftrace_graph_ret *graph_ret;
+        struct ring_buffer_event *event;
+        struct ftrace_graph_ent *call;
+        unsigned long long duration;
+        int ret;
+        int i;
+
+        event = ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
+        ret_entry = ring_buffer_event_data(event);
+        graph_ret = &ret_entry->ret;
+        call = &entry->graph_ent;
+        duration = graph_ret->rettime - graph_ret->calltime;
+
+        /* Overhead */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                ret = print_graph_overhead(duration, s);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Duration */
+        ret = print_graph_duration(duration, s);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Function */
+        for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        ret = seq_print_ip_sym(s, call->func, 0);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        ret = trace_seq_printf(s, "();\n");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
+                        struct trace_seq *s, pid_t pid, int cpu)
+{
+        int i;
+        int ret;
+        struct ftrace_graph_ent *call = &entry->graph_ent;
+
+        /* No overhead */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                ret = trace_seq_printf(s, "  ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Interrupt */
+        ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
+        if (ret == TRACE_TYPE_UNHANDLED) {
+                /* No time */
+                ret = trace_seq_printf(s, "            |  ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        } else {
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+
+        /* Function */
+        for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        ret = seq_print_ip_sym(s, call->func, 0);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        ret = trace_seq_printf(s, "() {\n");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
+                        struct trace_iterator *iter, int cpu)
+{
+        int ret;
+        struct trace_entry *ent = iter->ent;
+
+        /* Pid */
+        if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Cpu */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+                ret = print_graph_cpu(s, cpu);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Proc */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+                ret = print_graph_proc(s, ent->pid);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+
+                ret = trace_seq_printf(s, " | ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        if (trace_branch_is_leaf(iter, field))
+                return print_graph_entry_leaf(iter, field, s);
+        else
+                return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
+
+}
+
+static enum print_line_t
+print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
+                   struct trace_entry *ent, int cpu)
+{
+        int i;
+        int ret;
+        unsigned long long duration = trace->rettime - trace->calltime;
+
+        /* Pid */
+        if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Cpu */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+                ret = print_graph_cpu(s, cpu);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Proc */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+                ret = print_graph_proc(s, ent->pid);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+
+                ret = trace_seq_printf(s, " | ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Overhead */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                ret = print_graph_overhead(duration, s);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Duration */
+        ret = print_graph_duration(duration, s);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Closing brace */
+        for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
+                ret = trace_seq_printf(s, " ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        ret = trace_seq_printf(s, "}\n");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Overrun */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
+                ret = trace_seq_printf(s, " (Overruns: %lu)\n",
+                                        trace->overrun);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_comment(struct print_entry *trace, struct trace_seq *s,
+                   struct trace_entry *ent, struct trace_iterator *iter)
+{
+        int i;
+        int ret;
+
+        /* Pid */
+        if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Cpu */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+                ret = print_graph_cpu(s, iter->cpu);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* Proc */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+                ret = print_graph_proc(s, ent->pid);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+
+                ret = trace_seq_printf(s, " | ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* No overhead */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                ret = trace_seq_printf(s, "  ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
+
+        /* No time */
+        ret = trace_seq_printf(s, "            |  ");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Indentation */
+        if (trace->depth > 0)
+                for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
+                        ret = trace_seq_printf(s, " ");
+                        if (!ret)
+                                return TRACE_TYPE_PARTIAL_LINE;
+                }
+
+        /* The comment */
+        ret = trace_seq_printf(s, "/* %s", trace->buf);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        if (ent->flags & TRACE_FLAG_CONT)
+                trace_seq_print_cont(s, iter);
+
+        ret = trace_seq_printf(s, " */\n");
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        return TRACE_TYPE_HANDLED;
+}
+
+
+enum print_line_t
+print_graph_function(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry = iter->ent;
+
+        switch (entry->type) {
+        case TRACE_GRAPH_ENT: {
+                struct ftrace_graph_ent_entry *field;
+                trace_assign_type(field, entry);
+                return print_graph_entry(field, s, iter,
+                                         iter->cpu);
+        }
+        case TRACE_GRAPH_RET: {
+                struct ftrace_graph_ret_entry *field;
+                trace_assign_type(field, entry);
+                return print_graph_return(&field->ret, s, entry, iter->cpu);
+        }
+        case TRACE_PRINT: {
+                struct print_entry *field;
+                trace_assign_type(field, entry);
+                return print_graph_comment(field, s, entry, iter);
+        }
+        default:
+                return TRACE_TYPE_UNHANDLED;
+        }
+}
+
+static void print_graph_headers(struct seq_file *s)
+{
+        /* 1st line */
+        seq_printf(s, "# ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+                seq_printf(s, "CPU ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+                seq_printf(s, "TASK/PID     ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
+                seq_printf(s, "OVERHEAD/");
+        seq_printf(s, "DURATION            FUNCTION CALLS\n");
+
+        /* 2nd line */
+        seq_printf(s, "# ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+                seq_printf(s, "|   ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+                seq_printf(s, "|      |     ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+                seq_printf(s, "|        ");
+                seq_printf(s, "|                   |   |   |   |\n");
+        } else
+                seq_printf(s, "    |               |   |   |   |\n");
+}
+static struct tracer graph_trace __read_mostly = {
+        .name           = "function_graph",
+        .init           = graph_trace_init,
+        .reset          = graph_trace_reset,
+        .print_line     = print_graph_function,
+        .print_header   = print_graph_headers,
+        .flags          = &tracer_flags,
+};
+
+static __init int init_graph_trace(void)
+{
+        return register_tracer(&graph_trace);
+}
+
+device_initcall(init_graph_trace);
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
new file mode 100644
index 000000000000..b6a3e20a49a9
--- /dev/null
+++ b/kernel/trace/trace_hw_branches.c
@@ -0,0 +1,195 @@
+/*
+ * h/w branch tracer for x86 based on bts
+ *
+ * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+
+#include <asm/ds.h>
+
+#include "trace.h"
+
+
+#define SIZEOF_BTS (1 << 13)
+
+static DEFINE_PER_CPU(struct bts_tracer *, tracer);
+static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
+
+#define this_tracer per_cpu(tracer, smp_processor_id())
+#define this_buffer per_cpu(buffer, smp_processor_id())
+
+
+static void bts_trace_start_cpu(void *arg)
+{
+        if (this_tracer)
+                ds_release_bts(this_tracer);
+
+        this_tracer =
+                ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
+                               /* ovfl = */ NULL, /* th = */ (size_t)-1,
+                               BTS_KERNEL);
+        if (IS_ERR(this_tracer)) {
+                this_tracer = NULL;
+                return;
+        }
+}
+
+static void bts_trace_start(struct trace_array *tr)
+{
+        int cpu;
+
+        tracing_reset_online_cpus(tr);
+
+        for_each_cpu_mask(cpu, cpu_possible_map)
+                smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+}
+
+static void bts_trace_stop_cpu(void *arg)
+{
+        if (this_tracer) {
+                ds_release_bts(this_tracer);
+                this_tracer = NULL;
+        }
+}
+
+static void bts_trace_stop(struct trace_array *tr)
+{
+        int cpu;
+
+        for_each_cpu_mask(cpu, cpu_possible_map)
+                smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
+}
+
+static int bts_trace_init(struct trace_array *tr)
+{
+        tracing_reset_online_cpus(tr);
+        bts_trace_start(tr);
+
+        return 0;
+}
+
+static void bts_trace_print_header(struct seq_file *m)
+{
+        seq_puts(m,
+                 "# CPU#        FROM                   TO         FUNCTION\n");
+        seq_puts(m,
+                 "#  |           |                     |             |\n");
+}
+
+static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
+{
+        struct trace_entry *entry = iter->ent;
+        struct trace_seq *seq = &iter->seq;
+        struct hw_branch_entry *it;
+
+        trace_assign_type(it, entry);
+
+        if (entry->type == TRACE_HW_BRANCHES) {
+                if (trace_seq_printf(seq, "%4d  ", entry->cpu) &&
+                    trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
+                                     it->from, it->to) &&
+                    (!it->from ||
+                     seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
+                    trace_seq_printf(seq, "\n"))
+                        return TRACE_TYPE_HANDLED;
+                return TRACE_TYPE_PARTIAL_LINE;;
+        }
+        return TRACE_TYPE_UNHANDLED;
+}
+
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
+{
+        struct ring_buffer_event *event;
+        struct hw_branch_entry *entry;
+        unsigned long irq;
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
+        if (!event)
+                return;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, 0, from);
+        entry->ent.type = TRACE_HW_BRANCHES;
+        entry->ent.cpu = smp_processor_id();
+        entry->from = from;
+        entry->to   = to;
+        ring_buffer_unlock_commit(tr->buffer, event, irq);
+}
+
+static void trace_bts_at(struct trace_array *tr,
+                         const struct bts_trace *trace, void *at)
+{
+        struct bts_struct bts;
+        int err = 0;
+
+        WARN_ON_ONCE(!trace->read);
+        if (!trace->read)
+                return;
+
+        err = trace->read(this_tracer, at, &bts);
+        if (err < 0)
+                return;
+
+        switch (bts.qualifier) {
+        case BTS_BRANCH:
+                trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
+                break;
+        }
+}
+
+static void trace_bts_cpu(void *arg)
+{
+        struct trace_array *tr = (struct trace_array *) arg;
+        const struct bts_trace *trace;
+        unsigned char *at;
+
+        if (!this_tracer)
+                return;
+
+        ds_suspend_bts(this_tracer);
+        trace = ds_read_bts(this_tracer);
+        if (!trace)
+                goto out;
+
+        for (at = trace->ds.top; (void *)at < trace->ds.end;
+             at += trace->ds.size)
+                trace_bts_at(tr, trace, at);
+
+        for (at = trace->ds.begin; (void *)at < trace->ds.top;
+             at += trace->ds.size)
+                trace_bts_at(tr, trace, at);
+
+out:
+        ds_resume_bts(this_tracer);
+}
+
+static void trace_bts_prepare(struct trace_iterator *iter)
+{
+        int cpu;
+
+        for_each_cpu_mask(cpu, cpu_possible_map)
+                smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1);
+}
+
+struct tracer bts_tracer __read_mostly =
+{
+        .name           = "hw-branch-tracer",
+        .init           = bts_trace_init,
+        .reset          = bts_trace_stop,
+        .print_header   = bts_trace_print_header,
+        .print_line     = bts_trace_print_line,
+        .start          = bts_trace_start,
+        .stop           = bts_trace_stop,
+        .open           = trace_bts_prepare
+};
+
+__init static int init_bts_trace(void)
+{
+        return register_tracer(&bts_tracer);
+}
+device_initcall(init_bts_trace);
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 9c74071c10e0..7c2e326bbc8b 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -353,15 +353,28 @@ void trace_preempt_off(unsigned long a0, unsigned long a1)
 }
 #endif /* CONFIG_PREEMPT_TRACER */
 
+/*
+ * save_tracer_enabled is used to save the state of the tracer_enabled
+ * variable when we disable it when we open a trace output file.
+ */
+static int save_tracer_enabled;
+
 static void start_irqsoff_tracer(struct trace_array *tr)
 {
         register_ftrace_function(&trace_ops);
-        tracer_enabled = 1;
+        if (tracing_is_enabled()) {
+                tracer_enabled = 1;
+                save_tracer_enabled = 1;
+        } else {
+                tracer_enabled = 0;
+                save_tracer_enabled = 0;
+        }
 }
 
 static void stop_irqsoff_tracer(struct trace_array *tr)
 {
         tracer_enabled = 0;
+        save_tracer_enabled = 0;
         unregister_ftrace_function(&trace_ops);
 }
 
@@ -370,53 +383,55 @@ static void __irqsoff_tracer_init(struct trace_array *tr)
         irqsoff_trace = tr;
         /* make sure that the tracer is visible */
         smp_wmb();
-
-        if (tr->ctrl)
-                start_irqsoff_tracer(tr);
+        start_irqsoff_tracer(tr);
 }
 
 static void irqsoff_tracer_reset(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                stop_irqsoff_tracer(tr);
+        stop_irqsoff_tracer(tr);
 }
 
-static void irqsoff_tracer_ctrl_update(struct trace_array *tr)
+static void irqsoff_tracer_start(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                start_irqsoff_tracer(tr);
-        else
-                stop_irqsoff_tracer(tr);
+        tracer_enabled = 1;
+        save_tracer_enabled = 1;
+}
+
+static void irqsoff_tracer_stop(struct trace_array *tr)
+{
+        tracer_enabled = 0;
+        save_tracer_enabled = 0;
 }
 
 static void irqsoff_tracer_open(struct trace_iterator *iter)
 {
         /* stop the trace while dumping */
-        if (iter->tr->ctrl)
-                stop_irqsoff_tracer(iter->tr);
+        tracer_enabled = 0;
 }
 
 static void irqsoff_tracer_close(struct trace_iterator *iter)
 {
-        if (iter->tr->ctrl)
-                start_irqsoff_tracer(iter->tr);
+        /* restart tracing */
+        tracer_enabled = save_tracer_enabled;
 }
 
 #ifdef CONFIG_IRQSOFF_TRACER
-static void irqsoff_tracer_init(struct trace_array *tr)
+static int irqsoff_tracer_init(struct trace_array *tr)
 {
         trace_type = TRACER_IRQS_OFF;
 
         __irqsoff_tracer_init(tr);
+        return 0;
 }
 static struct tracer irqsoff_tracer __read_mostly =
 {
         .name           = "irqsoff",
         .init           = irqsoff_tracer_init,
         .reset          = irqsoff_tracer_reset,
+        .start          = irqsoff_tracer_start,
+        .stop           = irqsoff_tracer_stop,
         .open           = irqsoff_tracer_open,
         .close          = irqsoff_tracer_close,
-        .ctrl_update    = irqsoff_tracer_ctrl_update,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_irqsoff,
@@ -428,11 +443,12 @@ static struct tracer irqsoff_tracer __read_mostly =
 #endif
 
 #ifdef CONFIG_PREEMPT_TRACER
-static void preemptoff_tracer_init(struct trace_array *tr)
+static int preemptoff_tracer_init(struct trace_array *tr)
 {
         trace_type = TRACER_PREEMPT_OFF;
 
         __irqsoff_tracer_init(tr);
+        return 0;
 }
 
 static struct tracer preemptoff_tracer __read_mostly =
@@ -440,9 +456,10 @@ static struct tracer preemptoff_tracer __read_mostly =
         .name           = "preemptoff",
         .init           = preemptoff_tracer_init,
         .reset          = irqsoff_tracer_reset,
+        .start          = irqsoff_tracer_start,
+        .stop           = irqsoff_tracer_stop,
         .open           = irqsoff_tracer_open,
         .close          = irqsoff_tracer_close,
-        .ctrl_update    = irqsoff_tracer_ctrl_update,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_preemptoff,
@@ -456,11 +473,12 @@ static struct tracer preemptoff_tracer __read_mostly =
 #if defined(CONFIG_IRQSOFF_TRACER) && \
         defined(CONFIG_PREEMPT_TRACER)
 
-static void preemptirqsoff_tracer_init(struct trace_array *tr)
+static int preemptirqsoff_tracer_init(struct trace_array *tr)
 {
         trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF;
 
         __irqsoff_tracer_init(tr);
+        return 0;
 }
 
 static struct tracer preemptirqsoff_tracer __read_mostly =
@@ -468,9 +486,10 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
         .name           = "preemptirqsoff",
         .init           = preemptirqsoff_tracer_init,
         .reset          = irqsoff_tracer_reset,
+        .start          = irqsoff_tracer_start,
+        .stop           = irqsoff_tracer_stop,
         .open           = irqsoff_tracer_open,
         .close          = irqsoff_tracer_close,
-        .ctrl_update    = irqsoff_tracer_ctrl_update,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_preemptirqsoff,
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index e62cbf78eab6..fffcb069f1dc 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -22,44 +22,35 @@ static unsigned long prev_overruns;
 
 static void mmio_reset_data(struct trace_array *tr)
 {
-        int cpu;
-
         overrun_detected = false;
         prev_overruns = 0;
-        tr->time_start = ftrace_now(tr->cpu);
 
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
+        tracing_reset_online_cpus(tr);
 }
 
-static void mmio_trace_init(struct trace_array *tr)
+static int mmio_trace_init(struct trace_array *tr)
 {
         pr_debug("in %s\n", __func__);
         mmio_trace_array = tr;
-        if (tr->ctrl) {
-                mmio_reset_data(tr);
-                enable_mmiotrace();
-        }
+
+        mmio_reset_data(tr);
+        enable_mmiotrace();
+        return 0;
 }
 
 static void mmio_trace_reset(struct trace_array *tr)
 {
         pr_debug("in %s\n", __func__);
-        if (tr->ctrl)
-                disable_mmiotrace();
+
+        disable_mmiotrace();
         mmio_reset_data(tr);
         mmio_trace_array = NULL;
 }
 
-static void mmio_trace_ctrl_update(struct trace_array *tr)
+static void mmio_trace_start(struct trace_array *tr)
 {
         pr_debug("in %s\n", __func__);
-        if (tr->ctrl) {
-                mmio_reset_data(tr);
-                enable_mmiotrace();
-        } else {
-                disable_mmiotrace();
-        }
+        mmio_reset_data(tr);
 }
 
 static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
@@ -296,10 +287,10 @@ static struct tracer mmio_tracer __read_mostly =
         .name           = "mmiotrace",
         .init           = mmio_trace_init,
         .reset          = mmio_trace_reset,
+        .start          = mmio_trace_start,
         .pipe_open      = mmio_pipe_open,
         .close          = mmio_close,
         .read           = mmio_read,
-        .ctrl_update    = mmio_trace_ctrl_update,
         .print_line     = mmio_print_line,
 };
 
@@ -371,5 +362,5 @@ void mmio_trace_mapping(struct mmiotrace_map *map)
 
 int mmio_trace_printk(const char *fmt, va_list args)
 {
-        return trace_vprintk(0, fmt, args);
+        return trace_vprintk(0, -1, fmt, args);
 }
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index 4592b4862515..b9767acd30ac 100644
--- a/kernel/trace/trace_nop.c
+++ b/kernel/trace/trace_nop.c
@@ -12,6 +12,27 @@
 
 #include "trace.h"
 
+/* Our two options */
+enum {
+        TRACE_NOP_OPT_ACCEPT = 0x1,
+        TRACE_NOP_OPT_REFUSE = 0x2
+};
+
+/* Options for the tracer (see trace_options file) */
+static struct tracer_opt nop_opts[] = {
+        /* Option that will be accepted by set_flag callback */
+        { TRACER_OPT(test_nop_accept, TRACE_NOP_OPT_ACCEPT) },
+        /* Option that will be refused by set_flag callback */
+        { TRACER_OPT(test_nop_refuse, TRACE_NOP_OPT_REFUSE) },
+        { } /* Always set a last empty entry */
+};
+
+static struct tracer_flags nop_flags = {
+        /* You can check your flags value here when you want. */
+        .val = 0, /* By default: all flags disabled */
+        .opts = nop_opts
+};
+
 static struct trace_array       *ctx_trace;
 
 static void start_nop_trace(struct trace_array *tr)
@@ -24,7 +45,7 @@ static void stop_nop_trace(struct trace_array *tr)
         /* Nothing to do! */
 }
 
-static void nop_trace_init(struct trace_array *tr)
+static int nop_trace_init(struct trace_array *tr)
 {
         int cpu;
         ctx_trace = tr;
@@ -32,33 +53,53 @@ static void nop_trace_init(struct trace_array *tr)
         for_each_online_cpu(cpu)
                 tracing_reset(tr, cpu);
 
-        if (tr->ctrl)
-                start_nop_trace(tr);
+        start_nop_trace(tr);
+        return 0;
 }
 
 static void nop_trace_reset(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                stop_nop_trace(tr);
+        stop_nop_trace(tr);
 }
 
-static void nop_trace_ctrl_update(struct trace_array *tr)
+/* It only serves as a signal handler and a callback to
+ * accept or refuse tthe setting of a flag.
+ * If you don't implement it, then the flag setting will be
+ * automatically accepted.
+ */
+static int nop_set_flag(u32 old_flags, u32 bit, int set)
 {
-        /* When starting a new trace, reset the buffers */
-        if (tr->ctrl)
-                start_nop_trace(tr);
-        else
-                stop_nop_trace(tr);
+        /*
+         * Note that you don't need to update nop_flags.val yourself.
+         * The tracing Api will do it automatically if you return 0
+         */
+        if (bit == TRACE_NOP_OPT_ACCEPT) {
+                printk(KERN_DEBUG "nop_test_accept flag set to %d: we accept."
+                        " Now cat trace_options to see the result\n",
+                        set);
+                return 0;
+        }
+
+        if (bit == TRACE_NOP_OPT_REFUSE) {
+                printk(KERN_DEBUG "nop_test_refuse flag set to %d: we refuse."
+                        "Now cat trace_options to see the result\n",
+                        set);
+                return -EINVAL;
+        }
+
+        return 0;
 }
 
+
 struct tracer nop_trace __read_mostly =
 {
         .name           = "nop",
         .init           = nop_trace_init,
         .reset          = nop_trace_reset,
-        .ctrl_update    = nop_trace_ctrl_update,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest       = trace_selftest_startup_nop,
 #endif
+        .flags          = &nop_flags,
+        .set_flag       = nop_set_flag
 };
 
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
new file mode 100644
index 000000000000..a7172a352f62
--- /dev/null
+++ b/kernel/trace/trace_power.c
@@ -0,0 +1,179 @@
+/*
+ * ring buffer based C-state tracer
+ *
+ * Arjan van de Ven <arjan@linux.intel.com>
+ * Copyright (C) 2008 Intel Corporation
+ *
+ * Much is borrowed from trace_boot.c which is
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+#include <linux/module.h>
+
+#include "trace.h"
+
+static struct trace_array *power_trace;
+static int __read_mostly trace_power_enabled;
+
+
+static void start_power_trace(struct trace_array *tr)
+{
+        trace_power_enabled = 1;
+}
+
+static void stop_power_trace(struct trace_array *tr)
+{
+        trace_power_enabled = 0;
+}
+
+
+static int power_trace_init(struct trace_array *tr)
+{
+        int cpu;
+        power_trace = tr;
+
+        trace_power_enabled = 1;
+
+        for_each_cpu_mask(cpu, cpu_possible_map)
+                tracing_reset(tr, cpu);
+        return 0;
+}
+
+static enum print_line_t power_print_line(struct trace_iterator *iter)
+{
+        int ret = 0;
+        struct trace_entry *entry = iter->ent;
+        struct trace_power *field ;
+        struct power_trace *it;
+        struct trace_seq *s = &iter->seq;
+        struct timespec stamp;
+        struct timespec duration;
+
+        trace_assign_type(field, entry);
+        it = &field->state_data;
+        stamp = ktime_to_timespec(it->stamp);
+        duration = ktime_to_timespec(ktime_sub(it->end, it->stamp));
+
+        if (entry->type == TRACE_POWER) {
+                if (it->type == POWER_CSTATE)
+                        ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n",
+                                          stamp.tv_sec,
+                                          stamp.tv_nsec,
+                                          it->state, iter->cpu,
+                                          duration.tv_sec,
+                                          duration.tv_nsec);
+                if (it->type == POWER_PSTATE)
+                        ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n",
+                                          stamp.tv_sec,
+                                          stamp.tv_nsec,
+                                          it->state, iter->cpu);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                return TRACE_TYPE_HANDLED;
+        }
+        return TRACE_TYPE_UNHANDLED;
+}
+
+static struct tracer power_tracer __read_mostly =
+{
+        .name           = "power",
+        .init           = power_trace_init,
+        .start          = start_power_trace,
+        .stop           = stop_power_trace,
+        .reset          = stop_power_trace,
+        .print_line     = power_print_line,
+};
+
+static int init_power_trace(void)
+{
+        return register_tracer(&power_tracer);
+}
+device_initcall(init_power_trace);
+
+void trace_power_start(struct power_trace *it, unsigned int type,
+                         unsigned int level)
+{
+        if (!trace_power_enabled)
+                return;
+
+        memset(it, 0, sizeof(struct power_trace));
+        it->state = level;
+        it->type = type;
+        it->stamp = ktime_get();
+}
+EXPORT_SYMBOL_GPL(trace_power_start);
+
+
+void trace_power_end(struct power_trace *it)
+{
+        struct ring_buffer_event *event;
+        struct trace_power *entry;
+        struct trace_array_cpu *data;
+        unsigned long irq_flags;
+        struct trace_array *tr = power_trace;
+
+        if (!trace_power_enabled)
+                return;
+
+        preempt_disable();
+        it->end = ktime_get();
+        data = tr->data[smp_processor_id()];
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                goto out;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, 0, 0);
+        entry->ent.type = TRACE_POWER;
+        entry->state_data = *it;
+        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+        trace_wake_up();
+
+ out:
+        preempt_enable();
+}
+EXPORT_SYMBOL_GPL(trace_power_end);
+
+void trace_power_mark(struct power_trace *it, unsigned int type,
+                         unsigned int level)
+{
+        struct ring_buffer_event *event;
+        struct trace_power *entry;
+        struct trace_array_cpu *data;
+        unsigned long irq_flags;
+        struct trace_array *tr = power_trace;
+
+        if (!trace_power_enabled)
+                return;
+
+        memset(it, 0, sizeof(struct power_trace));
+        it->state = level;
+        it->type = type;
+        it->stamp = ktime_get();
+        preempt_disable();
+        it->end = it->stamp;
+        data = tr->data[smp_processor_id()];
+
+        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+                                         &irq_flags);
+        if (!event)
+                goto out;
+        entry   = ring_buffer_event_data(event);
+        tracing_generic_entry_update(&entry->ent, 0, 0);
+        entry->ent.type = TRACE_POWER;
+        entry->state_data = *it;
+        ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+        trace_wake_up();
+
+ out:
+        preempt_enable();
+}
+EXPORT_SYMBOL_GPL(trace_power_mark);
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index b8f56beb1a62..df175cb4564f 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -16,7 +16,8 @@
 
 static struct trace_array       *ctx_trace;
 static int __read_mostly        tracer_enabled;
-static atomic_t                 sched_ref;
+static int                      sched_ref;
+static DEFINE_MUTEX(sched_register_mutex);
 
 static void
 probe_sched_switch(struct rq *__rq, struct task_struct *prev,
@@ -27,7 +28,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
         int cpu;
         int pc;
 
-        if (!atomic_read(&sched_ref))
+        if (!sched_ref)
                 return;
 
         tracing_record_cmdline(prev);
@@ -48,7 +49,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
 }
 
 static void
-probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee)
+probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
 {
         struct trace_array_cpu *data;
         unsigned long flags;
@@ -71,16 +72,6 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee)
         local_irq_restore(flags);
 }
 
-static void sched_switch_reset(struct trace_array *tr)
-{
-        int cpu;
-
-        tr->time_start = ftrace_now(tr->cpu);
-
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
-}
-
 static int tracing_sched_register(void)
 {
         int ret;
@@ -123,20 +114,18 @@ static void tracing_sched_unregister(void)
 
 static void tracing_start_sched_switch(void)
 {
-        long ref;
-
-        ref = atomic_inc_return(&sched_ref);
-        if (ref == 1)
+        mutex_lock(&sched_register_mutex);
+        if (!(sched_ref++))
                 tracing_sched_register();
+        mutex_unlock(&sched_register_mutex);
 }
 
 static void tracing_stop_sched_switch(void)
 {
-        long ref;
-
-        ref = atomic_dec_and_test(&sched_ref);
-        if (ref)
+        mutex_lock(&sched_register_mutex);
+        if (!(--sched_ref))
                 tracing_sched_unregister();
+        mutex_unlock(&sched_register_mutex);
 }
 
 void tracing_start_cmdline_record(void)
@@ -149,40 +138,86 @@ void tracing_stop_cmdline_record(void)
         tracing_stop_sched_switch();
 }
 
+/**
+ * tracing_start_sched_switch_record - start tracing context switches
+ *
+ * Turns on context switch tracing for a tracer.
+ */
+void tracing_start_sched_switch_record(void)
+{
+        if (unlikely(!ctx_trace)) {
+                WARN_ON(1);
+                return;
+        }
+
+        tracing_start_sched_switch();
+
+        mutex_lock(&sched_register_mutex);
+        tracer_enabled++;
+        mutex_unlock(&sched_register_mutex);
+}
+
+/**
+ * tracing_stop_sched_switch_record - start tracing context switches
+ *
+ * Turns off context switch tracing for a tracer.
+ */
+void tracing_stop_sched_switch_record(void)
+{
+        mutex_lock(&sched_register_mutex);
+        tracer_enabled--;
+        WARN_ON(tracer_enabled < 0);
+        mutex_unlock(&sched_register_mutex);
+
+        tracing_stop_sched_switch();
+}
+
+/**
+ * tracing_sched_switch_assign_trace - assign a trace array for ctx switch
+ * @tr: trace array pointer to assign
+ *
+ * Some tracers might want to record the context switches in their
+ * trace. This function lets those tracers assign the trace array
+ * to use.
+ */
+void tracing_sched_switch_assign_trace(struct trace_array *tr)
+{
+        ctx_trace = tr;
+}
+
 static void start_sched_trace(struct trace_array *tr)
 {
-        sched_switch_reset(tr);
-        tracing_start_cmdline_record();
-        tracer_enabled = 1;
+        tracing_reset_online_cpus(tr);
+        tracing_start_sched_switch_record();
 }
 
 static void stop_sched_trace(struct trace_array *tr)
 {
-        tracer_enabled = 0;
-        tracing_stop_cmdline_record();
+        tracing_stop_sched_switch_record();
 }
 
-static void sched_switch_trace_init(struct trace_array *tr)
+static int sched_switch_trace_init(struct trace_array *tr)
 {
         ctx_trace = tr;
-
-        if (tr->ctrl)
-                start_sched_trace(tr);
+        start_sched_trace(tr);
+        return 0;
 }
 
 static void sched_switch_trace_reset(struct trace_array *tr)
 {
-        if (tr->ctrl)
+        if (sched_ref)
                 stop_sched_trace(tr);
 }
 
-static void sched_switch_trace_ctrl_update(struct trace_array *tr)
+static void sched_switch_trace_start(struct trace_array *tr)
 {
-        /* When starting a new trace, reset the buffers */
-        if (tr->ctrl)
-                start_sched_trace(tr);
-        else
-                stop_sched_trace(tr);
+        tracing_reset_online_cpus(tr);
+        tracing_start_sched_switch();
+}
+
+static void sched_switch_trace_stop(struct trace_array *tr)
+{
+        tracing_stop_sched_switch();
 }
 
 static struct tracer sched_switch_trace __read_mostly =
@@ -190,7 +225,8 @@ static struct tracer sched_switch_trace __read_mostly =
         .name           = "sched_switch",
         .init           = sched_switch_trace_init,
         .reset          = sched_switch_trace_reset,
-        .ctrl_update    = sched_switch_trace_ctrl_update,
+        .start          = sched_switch_trace_start,
+        .stop           = sched_switch_trace_stop,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_sched_switch,
 #endif
@@ -198,14 +234,7 @@ static struct tracer sched_switch_trace __read_mostly =
 
 __init static int init_sched_switch_trace(void)
 {
-        int ret = 0;
-
-        if (atomic_read(&sched_ref))
-                ret = tracing_sched_register();
-        if (ret) {
-                pr_info("error registering scheduler trace\n");
-                return ret;
-        }
         return register_tracer(&sched_switch_trace);
 }
 device_initcall(init_sched_switch_trace);
+
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 3ae93f16b565..43586b689e31 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -50,8 +50,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
                 return;
 
         pc = preempt_count();
-        resched = need_resched();
-        preempt_disable_notrace();
+        resched = ftrace_preempt_disable();
 
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
@@ -81,15 +80,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
  out:
         atomic_dec(&data->disabled);
 
-        /*
-         * To prevent recursion from the scheduler, if the
-         * resched flag was set before we entered, then
-         * don't reschedule.
-         */
-        if (resched)
-                preempt_enable_no_resched_notrace();
-        else
-                preempt_enable_notrace();
+        ftrace_preempt_enable(resched);
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
@@ -220,7 +211,7 @@ static void wakeup_reset(struct trace_array *tr)
 }
 
 static void
-probe_wakeup(struct rq *rq, struct task_struct *p)
+probe_wakeup(struct rq *rq, struct task_struct *p, int success)
 {
         int cpu = smp_processor_id();
         unsigned long flags;
@@ -271,6 +262,12 @@ out:
         atomic_dec(&wakeup_trace->data[cpu]->disabled);
 }
 
+/*
+ * save_tracer_enabled is used to save the state of the tracer_enabled
+ * variable when we disable it when we open a trace output file.
+ */
+static int save_tracer_enabled;
+
 static void start_wakeup_tracer(struct trace_array *tr)
 {
         int ret;
@@ -309,7 +306,13 @@ static void start_wakeup_tracer(struct trace_array *tr)
 
         register_ftrace_function(&trace_ops);
 
-        tracer_enabled = 1;
+        if (tracing_is_enabled()) {
+                tracer_enabled = 1;
+                save_tracer_enabled = 1;
+        } else {
+                tracer_enabled = 0;
+                save_tracer_enabled = 0;
+        }
 
         return;
 fail_deprobe_wake_new:
@@ -321,49 +324,53 @@ fail_deprobe:
 static void stop_wakeup_tracer(struct trace_array *tr)
 {
         tracer_enabled = 0;
+        save_tracer_enabled = 0;
         unregister_ftrace_function(&trace_ops);
         unregister_trace_sched_switch(probe_wakeup_sched_switch);
         unregister_trace_sched_wakeup_new(probe_wakeup);
         unregister_trace_sched_wakeup(probe_wakeup);
 }
 
-static void wakeup_tracer_init(struct trace_array *tr)
+static int wakeup_tracer_init(struct trace_array *tr)
 {
         wakeup_trace = tr;
-
-        if (tr->ctrl)
-                start_wakeup_tracer(tr);
+        start_wakeup_tracer(tr);
+        return 0;
 }
 
 static void wakeup_tracer_reset(struct trace_array *tr)
 {
-        if (tr->ctrl) {
-                stop_wakeup_tracer(tr);
-                /* make sure we put back any tasks we are tracing */
-                wakeup_reset(tr);
-        }
+        stop_wakeup_tracer(tr);
+        /* make sure we put back any tasks we are tracing */
+        wakeup_reset(tr);
+}
+
+static void wakeup_tracer_start(struct trace_array *tr)
+{
+        wakeup_reset(tr);
+        tracer_enabled = 1;
+        save_tracer_enabled = 1;
 }
 
-static void wakeup_tracer_ctrl_update(struct trace_array *tr)
+static void wakeup_tracer_stop(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                start_wakeup_tracer(tr);
-        else
-                stop_wakeup_tracer(tr);
+        tracer_enabled = 0;
+        save_tracer_enabled = 0;
 }
 
 static void wakeup_tracer_open(struct trace_iterator *iter)
 {
         /* stop the trace while dumping */
-        if (iter->tr->ctrl)
-                stop_wakeup_tracer(iter->tr);
+        tracer_enabled = 0;
 }
 
 static void wakeup_tracer_close(struct trace_iterator *iter)
 {
         /* forget about any processes we were recording */
-        if (iter->tr->ctrl)
-                start_wakeup_tracer(iter->tr);
+        if (save_tracer_enabled) {
+                wakeup_reset(iter->tr);
+                tracer_enabled = 1;
+        }
 }
 
 static struct tracer wakeup_tracer __read_mostly =
@@ -371,9 +378,10 @@ static struct tracer wakeup_tracer __read_mostly =
         .name           = "wakeup",
         .init           = wakeup_tracer_init,
         .reset          = wakeup_tracer_reset,
+        .start          = wakeup_tracer_start,
+        .stop           = wakeup_tracer_stop,
         .open           = wakeup_tracer_open,
         .close          = wakeup_tracer_close,
-        .ctrl_update    = wakeup_tracer_ctrl_update,
         .print_max      = 1,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_wakeup,
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 90bc752a7580..88c8eb70f54a 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -13,6 +13,7 @@ static inline int trace_valid_entry(struct trace_entry *entry)
         case TRACE_STACK:
         case TRACE_PRINT:
         case TRACE_SPECIAL:
+        case TRACE_BRANCH:
                 return 1;
         }
         return 0;
@@ -51,7 +52,7 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
         int cpu, ret = 0;
 
         /* Don't allow flipping of max traces now */
-        raw_local_irq_save(flags);
+        local_irq_save(flags);
         __raw_spin_lock(&ftrace_max_lock);
 
         cnt = ring_buffer_entries(tr->buffer);
@@ -62,7 +63,7 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
                         break;
         }
         __raw_spin_unlock(&ftrace_max_lock);
-        raw_local_irq_restore(flags);
+        local_irq_restore(flags);
 
         if (count)
                 *count = cnt;
@@ -70,6 +71,11 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
         return ret;
 }
 
+static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
+{
+        printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n",
+                trace->name, init_ret);
+}
 #ifdef CONFIG_FUNCTION_TRACER
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -110,8 +116,11 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
         ftrace_set_filter(func_name, strlen(func_name), 1);
 
         /* enable tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                goto out;
+        }
 
         /* Sleep for a 1/10 of a second */
         msleep(100);
@@ -134,13 +143,13 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
         msleep(100);
 
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         ftrace_enabled = 0;
 
         /* check the trace buffer */
         ret = trace_test_buffer(tr, &count);
         trace->reset(tr);
+        tracing_start();
 
         /* we should only have one item */
         if (!ret && count != 1) {
@@ -148,6 +157,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
                 ret = -1;
                 goto out;
         }
+
  out:
         ftrace_enabled = save_ftrace_enabled;
         tracer_enabled = save_tracer_enabled;
@@ -180,18 +190,22 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
         ftrace_enabled = 1;
         tracer_enabled = 1;
 
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                goto out;
+        }
+
         /* Sleep for a 1/10 of a second */
         msleep(100);
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         ftrace_enabled = 0;
 
         /* check the trace buffer */
         ret = trace_test_buffer(tr, &count);
         trace->reset(tr);
+        tracing_start();
 
         if (!ret && !count) {
                 printk(KERN_CONT ".. no entries found ..");
@@ -223,8 +237,12 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
         int ret;
 
         /* start the tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return ret;
+        }
+
         /* reset the max latency */
         tracing_max_latency = 0;
         /* disable interrupts for a bit */
@@ -232,13 +250,13 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
         udelay(100);
         local_irq_enable();
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check both trace buffers */
         ret = trace_test_buffer(tr, NULL);
         if (!ret)
                 ret = trace_test_buffer(&max_tr, &count);
         trace->reset(tr);
+        tracing_start();
 
         if (!ret && !count) {
                 printk(KERN_CONT ".. no entries found ..");
@@ -259,9 +277,26 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
         unsigned long count;
         int ret;
 
+        /*
+         * Now that the big kernel lock is no longer preemptable,
+         * and this is called with the BKL held, it will always
+         * fail. If preemption is already disabled, simply
+         * pass the test. When the BKL is removed, or becomes
+         * preemptible again, we will once again test this,
+         * so keep it in.
+         */
+        if (preempt_count()) {
+                printk(KERN_CONT "can not test ... force ");
+                return 0;
+        }
+
         /* start the tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return ret;
+        }
+
         /* reset the max latency */
         tracing_max_latency = 0;
         /* disable preemption for a bit */
@@ -269,13 +304,13 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
         udelay(100);
         preempt_enable();
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check both trace buffers */
         ret = trace_test_buffer(tr, NULL);
         if (!ret)
                 ret = trace_test_buffer(&max_tr, &count);
         trace->reset(tr);
+        tracing_start();
 
         if (!ret && !count) {
                 printk(KERN_CONT ".. no entries found ..");
@@ -296,9 +331,25 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
         unsigned long count;
         int ret;
 
+        /*
+         * Now that the big kernel lock is no longer preemptable,
+         * and this is called with the BKL held, it will always
+         * fail. If preemption is already disabled, simply
+         * pass the test. When the BKL is removed, or becomes
+         * preemptible again, we will once again test this,
+         * so keep it in.
+         */
+        if (preempt_count()) {
+                printk(KERN_CONT "can not test ... force ");
+                return 0;
+        }
+
         /* start the tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                goto out;
+        }
 
         /* reset the max latency */
         tracing_max_latency = 0;
@@ -312,27 +363,30 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
         local_irq_enable();
 
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check both trace buffers */
         ret = trace_test_buffer(tr, NULL);
-        if (ret)
+        if (ret) {
+                tracing_start();
                 goto out;
+        }
 
         ret = trace_test_buffer(&max_tr, &count);
-        if (ret)
+        if (ret) {
+                tracing_start();
                 goto out;
+        }
 
         if (!ret && !count) {
                 printk(KERN_CONT ".. no entries found ..");
                 ret = -1;
+                tracing_start();
                 goto out;
         }
 
         /* do the test by disabling interrupts first this time */
         tracing_max_latency = 0;
-        tr->ctrl = 1;
-        trace->ctrl_update(tr);
+        tracing_start();
         preempt_disable();
         local_irq_disable();
         udelay(100);
@@ -341,8 +395,7 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
         local_irq_enable();
 
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check both trace buffers */
         ret = trace_test_buffer(tr, NULL);
         if (ret)
@@ -358,6 +411,7 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
 
  out:
         trace->reset(tr);
+        tracing_start();
         tracing_max_latency = save_max;
 
         return ret;
@@ -423,8 +477,12 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
         wait_for_completion(&isrt);
 
         /* start the tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return ret;
+        }
+
         /* reset the max latency */
         tracing_max_latency = 0;
 
@@ -448,8 +506,7 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
         msleep(100);
 
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check both trace buffers */
         ret = trace_test_buffer(tr, NULL);
         if (!ret)
@@ -457,6 +514,7 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
 
 
         trace->reset(tr);
+        tracing_start();
 
         tracing_max_latency = save_max;
 
@@ -480,16 +538,20 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
         int ret;
 
         /* start the tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return ret;
+        }
+
         /* Sleep for a 1/10 of a second */
         msleep(100);
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check the trace buffer */
         ret = trace_test_buffer(tr, &count);
         trace->reset(tr);
+        tracing_start();
 
         if (!ret && !count) {
                 printk(KERN_CONT ".. no entries found ..");
@@ -508,17 +570,48 @@ trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
         int ret;
 
         /* start the tracing */
-        tr->ctrl = 1;
-        trace->init(tr);
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return 0;
+        }
+
         /* Sleep for a 1/10 of a second */
         msleep(100);
         /* stop the tracing. */
-        tr->ctrl = 0;
-        trace->ctrl_update(tr);
+        tracing_stop();
         /* check the trace buffer */
         ret = trace_test_buffer(tr, &count);
         trace->reset(tr);
+        tracing_start();
 
         return ret;
 }
 #endif /* CONFIG_SYSPROF_TRACER */
+
+#ifdef CONFIG_BRANCH_TRACER
+int
+trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
+{
+        unsigned long count;
+        int ret;
+
+        /* start the tracing */
+        ret = trace->init(tr);
+        if (ret) {
+                warn_failed_init_tracer(trace, ret);
+                return ret;
+        }
+
+        /* Sleep for a 1/10 of a second */
+        msleep(100);
+        /* stop the tracing. */
+        tracing_stop();
+        /* check the trace buffer */
+        ret = trace_test_buffer(tr, &count);
+        trace->reset(tr);
+        tracing_start();
+
+        return ret;
+}
+#endif /* CONFIG_BRANCH_TRACER */
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 3bdb44bde4b7..d0871bc0aca5 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -10,6 +10,7 @@
 #include <linux/debugfs.h>
 #include <linux/ftrace.h>
 #include <linux/module.h>
+#include <linux/sysctl.h>
 #include <linux/init.h>
 #include <linux/fs.h>
 #include "trace.h"
@@ -31,6 +32,10 @@ static raw_spinlock_t max_stack_lock =
 
 static int stack_trace_disabled __read_mostly;
 static DEFINE_PER_CPU(int, trace_active);
+static DEFINE_MUTEX(stack_sysctl_mutex);
+
+int stack_tracer_enabled;
+static int last_stack_tracer_enabled;
 
 static inline void check_stack(void)
 {
@@ -48,7 +53,7 @@ static inline void check_stack(void)
         if (!object_is_on_stack(&this_size))
                 return;
 
-        raw_local_irq_save(flags);
+        local_irq_save(flags);
         __raw_spin_lock(&max_stack_lock);
 
         /* a race could have already updated it */
@@ -78,6 +83,7 @@ static inline void check_stack(void)
          * on a new max, so it is far from a fast path.
          */
         while (i < max_stack_trace.nr_entries) {
+                int found = 0;
 
                 stack_dump_index[i] = this_size;
                 p = start;
@@ -86,17 +92,19 @@ static inline void check_stack(void)
                         if (*p == stack_dump_trace[i]) {
                                 this_size = stack_dump_index[i++] =
                                         (top - p) * sizeof(unsigned long);
+                                found = 1;
                                 /* Start the search from here */
                                 start = p + 1;
                         }
                 }
 
-                i++;
+                if (!found)
+                        i++;
         }
 
  out:
         __raw_spin_unlock(&max_stack_lock);
-        raw_local_irq_restore(flags);
+        local_irq_restore(flags);
 }
 
 static void
@@ -107,8 +115,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
         if (unlikely(!ftrace_enabled || stack_trace_disabled))
                 return;
 
-        resched = need_resched();
-        preempt_disable_notrace();
+        resched = ftrace_preempt_disable();
 
         cpu = raw_smp_processor_id();
         /* no atomic needed, we only modify this variable by this cpu */
@@ -120,10 +127,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
  out:
         per_cpu(trace_active, cpu)--;
         /* prevent recursion in schedule */
-        if (resched)
-                preempt_enable_no_resched_notrace();
-        else
-                preempt_enable_notrace();
+        ftrace_preempt_enable(resched);
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
@@ -166,16 +170,16 @@ stack_max_size_write(struct file *filp, const char __user *ubuf,
         if (ret < 0)
                 return ret;
 
-        raw_local_irq_save(flags);
+        local_irq_save(flags);
         __raw_spin_lock(&max_stack_lock);
         *ptr = val;
         __raw_spin_unlock(&max_stack_lock);
-        raw_local_irq_restore(flags);
+        local_irq_restore(flags);
 
         return count;
 }
 
-static struct file_operations stack_max_size_fops = {
+static const struct file_operations stack_max_size_fops = {
         .open           = tracing_open_generic,
         .read           = stack_max_size_read,
         .write          = stack_max_size_write,
@@ -273,7 +277,7 @@ static int t_show(struct seq_file *m, void *v)
         return 0;
 }
 
-static struct seq_operations stack_trace_seq_ops = {
+static const struct seq_operations stack_trace_seq_ops = {
         .start          = t_start,
         .next           = t_next,
         .stop           = t_stop,
@@ -289,12 +293,47 @@ static int stack_trace_open(struct inode *inode, struct file *file)
         return ret;
 }
 
-static struct file_operations stack_trace_fops = {
+static const struct file_operations stack_trace_fops = {
         .open           = stack_trace_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
 };
 
+int
+stack_trace_sysctl(struct ctl_table *table, int write,
+                   struct file *file, void __user *buffer, size_t *lenp,
+                   loff_t *ppos)
+{
+        int ret;
+
+        mutex_lock(&stack_sysctl_mutex);
+
+        ret = proc_dointvec(table, write, file, buffer, lenp, ppos);
+
+        if (ret || !write ||
+            (last_stack_tracer_enabled == stack_tracer_enabled))
+                goto out;
+
+        last_stack_tracer_enabled = stack_tracer_enabled;
+
+        if (stack_tracer_enabled)
+                register_ftrace_function(&trace_ops);
+        else
+                unregister_ftrace_function(&trace_ops);
+
+ out:
+        mutex_unlock(&stack_sysctl_mutex);
+        return ret;
+}
+
+static __init int enable_stacktrace(char *str)
+{
+        stack_tracer_enabled = 1;
+        last_stack_tracer_enabled = 1;
+        return 1;
+}
+__setup("stacktrace", enable_stacktrace);
+
 static __init int stack_trace_init(void)
 {
         struct dentry *d_tracer;
@@ -312,7 +351,8 @@ static __init int stack_trace_init(void)
         if (!entry)
                 pr_warning("Could not create debugfs 'stack_trace' entry\n");
 
-        register_ftrace_function(&trace_ops);
+        if (stack_tracer_enabled)
+                register_ftrace_function(&trace_ops);
 
         return 0;
 }
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index 9587d3bcba55..a5779bd975db 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -202,7 +202,6 @@ static void start_stack_timer(int cpu)
 
         hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         hrtimer->function = stack_trace_timer_fn;
-        hrtimer->cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
 
         hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL);
 }
@@ -234,20 +233,10 @@ static void stop_stack_timers(void)
                 stop_stack_timer(cpu);
 }
 
-static void stack_reset(struct trace_array *tr)
-{
-        int cpu;
-
-        tr->time_start = ftrace_now(tr->cpu);
-
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
-}
-
 static void start_stack_trace(struct trace_array *tr)
 {
         mutex_lock(&sample_timer_lock);
-        stack_reset(tr);
+        tracing_reset_online_cpus(tr);
         start_stack_timers();
         tracer_enabled = 1;
         mutex_unlock(&sample_timer_lock);
@@ -261,27 +250,17 @@ static void stop_stack_trace(struct trace_array *tr)
         mutex_unlock(&sample_timer_lock);
 }
 
-static void stack_trace_init(struct trace_array *tr)
+static int stack_trace_init(struct trace_array *tr)
 {
         sysprof_trace = tr;
 
-        if (tr->ctrl)
-                start_stack_trace(tr);
+        start_stack_trace(tr);
+        return 0;
 }
 
 static void stack_trace_reset(struct trace_array *tr)
 {
-        if (tr->ctrl)
-                stop_stack_trace(tr);
-}
-
-static void stack_trace_ctrl_update(struct trace_array *tr)
-{
-        /* When starting a new trace, reset the buffers */
-        if (tr->ctrl)
-                start_stack_trace(tr);
-        else
-                stop_stack_trace(tr);
+        stop_stack_trace(tr);
 }
 
 static struct tracer stack_trace __read_mostly =
@@ -289,7 +268,6 @@ static struct tracer stack_trace __read_mostly =
         .name           = "sysprof",
         .init           = stack_trace_init,
         .reset          = stack_trace_reset,
-        .ctrl_update    = stack_trace_ctrl_update,
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_sysprof,
 #endif
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index af8c85664882..79602740bbb5 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -43,6 +43,7 @@ static DEFINE_MUTEX(tracepoints_mutex);
  */
 #define TRACEPOINT_HASH_BITS 6
 #define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS)
+static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE];
 
 /*
  * Note about RCU :
@@ -54,40 +55,43 @@ struct tracepoint_entry {
         struct hlist_node hlist;
         void **funcs;
         int refcount;   /* Number of times armed. 0 if disarmed. */
-        struct rcu_head rcu;
-        void *oldptr;
-        unsigned char rcu_pending:1;
         char name[0];
 };
 
-static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE];
+struct tp_probes {
+        union {
+                struct rcu_head rcu;
+                struct list_head list;
+        } u;
+        void *probes[0];
+};
 
-static void free_old_closure(struct rcu_head *head)
+static inline void *allocate_probes(int count)
 {
-        struct tracepoint_entry *entry = container_of(head,
-                struct tracepoint_entry, rcu);
-        kfree(entry->oldptr);
-        /* Make sure we free the data before setting the pending flag to 0 */
-        smp_wmb();
-        entry->rcu_pending = 0;
+        struct tp_probes *p  = kmalloc(count * sizeof(void *)
+                        + sizeof(struct tp_probes), GFP_KERNEL);
+        return p == NULL ? NULL : p->probes;
 }
 
-static void tracepoint_entry_free_old(struct tracepoint_entry *entry, void *old)
+static void rcu_free_old_probes(struct rcu_head *head)
 {
-        if (!old)
-                return;
-        entry->oldptr = old;
-        entry->rcu_pending = 1;
-        /* write rcu_pending before calling the RCU callback */
-        smp_wmb();
-        call_rcu_sched(&entry->rcu, free_old_closure);
+        kfree(container_of(head, struct tp_probes, u.rcu));
+}
+
+static inline void release_probes(void *old)
+{
+        if (old) {
+                struct tp_probes *tp_probes = container_of(old,
+                        struct tp_probes, probes[0]);
+                call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes);
+        }
 }
 
 static void debug_print_probes(struct tracepoint_entry *entry)
 {
         int i;
 
-        if (!tracepoint_debug)
+        if (!tracepoint_debug || !entry->funcs)
                 return;
 
         for (i = 0; entry->funcs[i]; i++)
@@ -111,12 +115,13 @@ tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe)
                                 return ERR_PTR(-EEXIST);
         }
         /* + 2 : one for new probe, one for NULL func */
-        new = kzalloc((nr_probes + 2) * sizeof(void *), GFP_KERNEL);
+        new = allocate_probes(nr_probes + 2);
         if (new == NULL)
                 return ERR_PTR(-ENOMEM);
         if (old)
                 memcpy(new, old, nr_probes * sizeof(void *));
         new[nr_probes] = probe;
+        new[nr_probes + 1] = NULL;
         entry->refcount = nr_probes + 1;
         entry->funcs = new;
         debug_print_probes(entry);
@@ -132,7 +137,7 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe)
         old = entry->funcs;
 
         if (!old)
-                return NULL;
+                return ERR_PTR(-ENOENT);
 
         debug_print_probes(entry);
         /* (N -> M), (N > 1, M >= 0) probes */
@@ -151,13 +156,13 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe)
                 int j = 0;
                 /* N -> M, (N > 1, M > 0) */
                 /* + 1 for NULL */
-                new = kzalloc((nr_probes - nr_del + 1)
-                        * sizeof(void *), GFP_KERNEL);
+                new = allocate_probes(nr_probes - nr_del + 1);
                 if (new == NULL)
                         return ERR_PTR(-ENOMEM);
                 for (i = 0; old[i]; i++)
                         if ((probe && old[i] != probe))
                                 new[j++] = old[i];
+                new[nr_probes - nr_del] = NULL;
                 entry->refcount = nr_probes - nr_del;
                 entry->funcs = new;
         }
@@ -215,7 +220,6 @@ static struct tracepoint_entry *add_tracepoint(const char *name)
         memcpy(&e->name[0], name, name_len);
         e->funcs = NULL;
         e->refcount = 0;
-        e->rcu_pending = 0;
         hlist_add_head(&e->hlist, head);
         return e;
 }
@@ -224,32 +228,10 @@ static struct tracepoint_entry *add_tracepoint(const char *name)
  * Remove the tracepoint from the tracepoint hash table. Must be called with
  * mutex_lock held.
  */
-static int remove_tracepoint(const char *name)
+static inline void remove_tracepoint(struct tracepoint_entry *e)
 {
-        struct hlist_head *head;
-        struct hlist_node *node;
-        struct tracepoint_entry *e;
-        int found = 0;
-        size_t len = strlen(name) + 1;
-        u32 hash = jhash(name, len-1, 0);
-
-        head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
-        hlist_for_each_entry(e, node, head, hlist) {
-                if (!strcmp(name, e->name)) {
-                        found = 1;
-                        break;
-                }
-        }
-        if (!found)
-                return -ENOENT;
-        if (e->refcount)
-                return -EBUSY;
         hlist_del(&e->hlist);
-        /* Make sure the call_rcu_sched has been executed */
-        if (e->rcu_pending)
-                rcu_barrier_sched();
         kfree(e);
-        return 0;
 }
 
 /*
@@ -280,6 +262,7 @@ static void set_tracepoint(struct tracepoint_entry **entry,
 static void disable_tracepoint(struct tracepoint *elem)
 {
         elem->state = 0;
+        rcu_assign_pointer(elem->funcs, NULL);
 }
 
 /**
@@ -320,6 +303,23 @@ static void tracepoint_update_probes(void)
         module_update_tracepoints();
 }
 
+static void *tracepoint_add_probe(const char *name, void *probe)
+{
+        struct tracepoint_entry *entry;
+        void *old;
+
+        entry = get_tracepoint(name);
+        if (!entry) {
+                entry = add_tracepoint(name);
+                if (IS_ERR(entry))
+                        return entry;
+        }
+        old = tracepoint_entry_add_probe(entry, probe);
+        if (IS_ERR(old) && !entry->refcount)
+                remove_tracepoint(entry);
+        return old;
+}
+
 /**
  * tracepoint_probe_register -  Connect a probe to a tracepoint
  * @name: tracepoint name
@@ -330,44 +330,36 @@ static void tracepoint_update_probes(void)
  */
 int tracepoint_probe_register(const char *name, void *probe)
 {
-        struct tracepoint_entry *entry;
-        int ret = 0;
         void *old;
 
         mutex_lock(&tracepoints_mutex);
-        entry = get_tracepoint(name);
-        if (!entry) {
-                entry = add_tracepoint(name);
-                if (IS_ERR(entry)) {
-                        ret = PTR_ERR(entry);
-                        goto end;
-                }
-        }
-        /*
-         * If we detect that a call_rcu_sched is pending for this tracepoint,
-         * make sure it's executed now.
-         */
-        if (entry->rcu_pending)
-                rcu_barrier_sched();
-        old = tracepoint_entry_add_probe(entry, probe);
-        if (IS_ERR(old)) {
-                ret = PTR_ERR(old);
-                goto end;
-        }
+        old = tracepoint_add_probe(name, probe);
         mutex_unlock(&tracepoints_mutex);
+        if (IS_ERR(old))
+                return PTR_ERR(old);
+
         tracepoint_update_probes();             /* may update entry */
-        mutex_lock(&tracepoints_mutex);
-        entry = get_tracepoint(name);
-        WARN_ON(!entry);
-        if (entry->rcu_pending)
-                rcu_barrier_sched();
-        tracepoint_entry_free_old(entry, old);
-end:
-        mutex_unlock(&tracepoints_mutex);
-        return ret;
+        release_probes(old);
+        return 0;
 }
 EXPORT_SYMBOL_GPL(tracepoint_probe_register);
 
+static void *tracepoint_remove_probe(const char *name, void *probe)
+{
+        struct tracepoint_entry *entry;
+        void *old;
+
+        entry = get_tracepoint(name);
+        if (!entry)
+                return ERR_PTR(-ENOENT);
+        old = tracepoint_entry_remove_probe(entry, probe);
+        if (IS_ERR(old))
+                return old;
+        if (!entry->refcount)
+                remove_tracepoint(entry);
+        return old;
+}
+
 /**
  * tracepoint_probe_unregister -  Disconnect a probe from a tracepoint
  * @name: tracepoint name
@@ -380,38 +372,104 @@ EXPORT_SYMBOL_GPL(tracepoint_probe_register);
  */
 int tracepoint_probe_unregister(const char *name, void *probe)
 {
-        struct tracepoint_entry *entry;
         void *old;
-        int ret = -ENOENT;
 
         mutex_lock(&tracepoints_mutex);
-        entry = get_tracepoint(name);
-        if (!entry)
-                goto end;
-        if (entry->rcu_pending)
-                rcu_barrier_sched();
-        old = tracepoint_entry_remove_probe(entry, probe);
-        if (!old) {
-                printk(KERN_WARNING "Warning: Trying to unregister a probe"
-                                    "that doesn't exist\n");
-                goto end;
-        }
+        old = tracepoint_remove_probe(name, probe);
         mutex_unlock(&tracepoints_mutex);
+        if (IS_ERR(old))
+                return PTR_ERR(old);
+
         tracepoint_update_probes();             /* may update entry */
+        release_probes(old);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
+
+static LIST_HEAD(old_probes);
+static int need_update;
+
+static void tracepoint_add_old_probes(void *old)
+{
+        need_update = 1;
+        if (old) {
+                struct tp_probes *tp_probes = container_of(old,
+                        struct tp_probes, probes[0]);
+                list_add(&tp_probes->u.list, &old_probes);
+        }
+}
+
+/**
+ * tracepoint_probe_register_noupdate -  register a probe but not connect
+ * @name: tracepoint name
+ * @probe: probe handler
+ *
+ * caller must call tracepoint_probe_update_all()
+ */
+int tracepoint_probe_register_noupdate(const char *name, void *probe)
+{
+        void *old;
+
         mutex_lock(&tracepoints_mutex);
-        entry = get_tracepoint(name);
-        if (!entry)
-                goto end;
-        if (entry->rcu_pending)
-                rcu_barrier_sched();
-        tracepoint_entry_free_old(entry, old);
-        remove_tracepoint(name);        /* Ignore busy error message */
-        ret = 0;
-end:
+        old = tracepoint_add_probe(name, probe);
+        if (IS_ERR(old)) {
+                mutex_unlock(&tracepoints_mutex);
+                return PTR_ERR(old);
+        }
+        tracepoint_add_old_probes(old);
         mutex_unlock(&tracepoints_mutex);
-        return ret;
+        return 0;
 }
-EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
+EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate);
+
+/**
+ * tracepoint_probe_unregister_noupdate -  remove a probe but not disconnect
+ * @name: tracepoint name
+ * @probe: probe function pointer
+ *
+ * caller must call tracepoint_probe_update_all()
+ */
+int tracepoint_probe_unregister_noupdate(const char *name, void *probe)
+{
+        void *old;
+
+        mutex_lock(&tracepoints_mutex);
+        old = tracepoint_remove_probe(name, probe);
+        if (IS_ERR(old)) {
+                mutex_unlock(&tracepoints_mutex);
+                return PTR_ERR(old);
+        }
+        tracepoint_add_old_probes(old);
+        mutex_unlock(&tracepoints_mutex);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate);
+
+/**
+ * tracepoint_probe_update_all -  update tracepoints
+ */
+void tracepoint_probe_update_all(void)
+{
+        LIST_HEAD(release_probes);
+        struct tp_probes *pos, *next;
+
+        mutex_lock(&tracepoints_mutex);
+        if (!need_update) {
+                mutex_unlock(&tracepoints_mutex);
+                return;
+        }
+        if (!list_empty(&old_probes))
+                list_replace_init(&old_probes, &release_probes);
+        need_update = 0;
+        mutex_unlock(&tracepoints_mutex);
+
+        tracepoint_update_probes();
+        list_for_each_entry_safe(pos, next, &release_probes, u.list) {
+                list_del(&pos->u.list);
+                call_rcu_sched(&pos->u.rcu, rcu_free_old_probes);
+        }
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
 
 /**
  * tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
@@ -483,3 +541,36 @@ void tracepoint_iter_reset(struct tracepoint_iter *iter)
         iter->tracepoint = NULL;
 }
 EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
+
+#ifdef CONFIG_MODULES
+
+int tracepoint_module_notify(struct notifier_block *self,
+                             unsigned long val, void *data)
+{
+        struct module *mod = data;
+
+        switch (val) {
+        case MODULE_STATE_COMING:
+                tracepoint_update_probe_range(mod->tracepoints,
+                        mod->tracepoints + mod->num_tracepoints);
+                break;
+        case MODULE_STATE_GOING:
+                tracepoint_update_probe_range(mod->tracepoints,
+                        mod->tracepoints + mod->num_tracepoints);
+                break;
+        }
+        return 0;
+}
+
+struct notifier_block tracepoint_module_nb = {
+        .notifier_call = tracepoint_module_notify,
+        .priority = 0,
+};
+
+static int init_tracepoints(void)
+{
+        return register_module_notifier(&tracepoint_module_nb);
+}
+__initcall(init_tracepoints);
+
+#endif /* CONFIG_MODULES */
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 8ebcd8532dfb..2dc06ab35716 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -27,6 +27,7 @@
  */
 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
 {
+        const struct cred *tcred;
         struct timespec uptime, ts;
         u64 ac_etime;
 
@@ -53,10 +54,11 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
                 stats->ac_flag |= AXSIG;
         stats->ac_nice   = task_nice(tsk);
         stats->ac_sched  = tsk->policy;
-        stats->ac_uid    = tsk->uid;
-        stats->ac_gid    = tsk->gid;
         stats->ac_pid    = tsk->pid;
         rcu_read_lock();
+        tcred = __task_cred(tsk);
+        stats->ac_uid    = tcred->uid;
+        stats->ac_gid    = tcred->gid;
         stats->ac_ppid   = pid_alive(tsk) ?
                                 rcu_dereference(tsk->real_parent)->tgid : 0;
         rcu_read_unlock();
diff --git a/kernel/uid16.c b/kernel/uid16.c
index 3e41c1673e2f..2460c3199b5a 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -84,11 +84,12 @@ asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
 
 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
 {
+        const struct cred *cred = current_cred();
         int retval;
 
-        if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
-            !(retval = put_user(high2lowuid(current->euid), euid)))
-                retval = put_user(high2lowuid(current->suid), suid);
+        if (!(retval   = put_user(high2lowuid(cred->uid),  ruid)) &&
+            !(retval   = put_user(high2lowuid(cred->euid), euid)))
+                retval = put_user(high2lowuid(cred->suid), suid);
 
         return retval;
 }
@@ -104,11 +105,12 @@ asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
 
 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
 {
+        const struct cred *cred = current_cred();
         int retval;
 
-        if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
-            !(retval = put_user(high2lowgid(current->egid), egid)))
-                retval = put_user(high2lowgid(current->sgid), sgid);
+        if (!(retval   = put_user(high2lowgid(cred->gid),  rgid)) &&
+            !(retval   = put_user(high2lowgid(cred->egid), egid)))
+                retval = put_user(high2lowgid(cred->sgid), sgid);
 
         return retval;
 }
@@ -161,25 +163,24 @@ static int groups16_from_user(struct group_info *group_info,
 
 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
 {
-        int i = 0;
+        const struct cred *cred = current_cred();
+        int i;
 
         if (gidsetsize < 0)
                 return -EINVAL;
 
-        get_group_info(current->group_info);
-        i = current->group_info->ngroups;
+        i = cred->group_info->ngroups;
         if (gidsetsize) {
                 if (i > gidsetsize) {
                         i = -EINVAL;
                         goto out;
                 }
-                if (groups16_to_user(grouplist, current->group_info)) {
+                if (groups16_to_user(grouplist, cred->group_info)) {
                         i = -EFAULT;
                         goto out;
                 }
         }
 out:
-        put_group_info(current->group_info);
         return i;
 }
 
@@ -210,20 +211,20 @@ asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
 
 asmlinkage long sys_getuid16(void)
 {
-        return high2lowuid(current->uid);
+        return high2lowuid(current_uid());
 }
 
 asmlinkage long sys_geteuid16(void)
 {
-        return high2lowuid(current->euid);
+        return high2lowuid(current_euid());
 }
 
 asmlinkage long sys_getgid16(void)
 {
-        return high2lowgid(current->gid);
+        return high2lowgid(current_gid());
 }
 
 asmlinkage long sys_getegid16(void)
 {
-        return high2lowgid(current->egid);
+        return high2lowgid(current_egid());
 }
diff --git a/kernel/user.c b/kernel/user.c
index 39d6159fae43..477b6660f447 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -16,12 +16,13 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/user_namespace.h>
+#include "cred-internals.h"
 
 struct user_namespace init_user_ns = {
         .kref = {
-                .refcount       = ATOMIC_INIT(2),
+                .refcount       = ATOMIC_INIT(1),
         },
-        .root_user = &root_user,
+        .creator = &root_user,
 };
 EXPORT_SYMBOL_GPL(init_user_ns);
 
@@ -47,12 +48,14 @@ static struct kmem_cache *uid_cachep;
  */
 static DEFINE_SPINLOCK(uidhash_lock);
 
+/* root_user.__count is 2, 1 for init task cred, 1 for init_user_ns->creator */
 struct user_struct root_user = {
-        .__count        = ATOMIC_INIT(1),
+        .__count        = ATOMIC_INIT(2),
         .processes      = ATOMIC_INIT(1),
         .files          = ATOMIC_INIT(0),
         .sigpending     = ATOMIC_INIT(0),
         .locked_shm     = 0,
+        .user_ns        = &init_user_ns,
 #ifdef CONFIG_USER_SCHED
         .tg             = &init_task_group,
 #endif
@@ -101,19 +104,15 @@ static int sched_create_user(struct user_struct *up)
         if (IS_ERR(up->tg))
                 rc = -ENOMEM;
 
-        return rc;
-}
+        set_tg_uid(up);
 
-static void sched_switch_user(struct task_struct *p)
-{
-        sched_move_task(p);
+        return rc;
 }
 
 #else   /* CONFIG_USER_SCHED */
 
 static void sched_destroy_user(struct user_struct *up) { }
 static int sched_create_user(struct user_struct *up) { return 0; }
-static void sched_switch_user(struct task_struct *p) { }
 
 #endif  /* CONFIG_USER_SCHED */
 
@@ -242,13 +241,21 @@ static struct kobj_type uids_ktype = {
         .release = uids_release,
 };
 
-/* create /sys/kernel/uids/<uid>/cpu_share file for this user */
+/*
+ * Create /sys/kernel/uids/<uid>/cpu_share file for this user
+ * We do not create this file for users in a user namespace (until
+ * sysfs tagging is implemented).
+ *
+ * See Documentation/scheduler/sched-design-CFS.txt for ramifications.
+ */
 static int uids_user_create(struct user_struct *up)
 {
         struct kobject *kobj = &up->kobj;
         int error;
 
         memset(kobj, 0, sizeof(struct kobject));
+        if (up->user_ns != &init_user_ns)
+                return 0;
         kobj->kset = uids_kset;
         error = kobject_init_and_add(kobj, &uids_ktype, NULL, "%d", up->uid);
         if (error) {
@@ -284,6 +291,8 @@ static void remove_user_sysfs_dir(struct work_struct *w)
         unsigned long flags;
         int remove_user = 0;
 
+        if (up->user_ns != &init_user_ns)
+                return;
         /* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
          * atomic.
          */
@@ -319,12 +328,13 @@ done:
  * IRQ state (as stored in flags) is restored and uidhash_lock released
  * upon function exit.
  */
-static inline void free_user(struct user_struct *up, unsigned long flags)
+static void free_user(struct user_struct *up, unsigned long flags)
 {
         /* restore back the count */
         atomic_inc(&up->__count);
         spin_unlock_irqrestore(&uidhash_lock, flags);
 
+        put_user_ns(up->user_ns);
         INIT_WORK(&up->work, remove_user_sysfs_dir);
         schedule_work(&up->work);
 }
@@ -340,13 +350,14 @@ static inline void uids_mutex_unlock(void) { }
  * IRQ state (as stored in flags) is restored and uidhash_lock released
  * upon function exit.
  */
-static inline void free_user(struct user_struct *up, unsigned long flags)
+static void free_user(struct user_struct *up, unsigned long flags)
 {
         uid_hash_remove(up);
         spin_unlock_irqrestore(&uidhash_lock, flags);
         sched_destroy_user(up);
         key_put(up->uid_keyring);
         key_put(up->session_keyring);
+        put_user_ns(up->user_ns);
         kmem_cache_free(uid_cachep, up);
 }
 
@@ -362,7 +373,7 @@ struct user_struct *find_user(uid_t uid)
 {
         struct user_struct *ret;
         unsigned long flags;
-        struct user_namespace *ns = current->nsproxy->user_ns;
+        struct user_namespace *ns = current_user_ns();
 
         spin_lock_irqsave(&uidhash_lock, flags);
         ret = uid_hash_find(uid, uidhashentry(ns, uid));
@@ -409,6 +420,8 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
                 if (sched_create_user(new) < 0)
                         goto out_free_user;
 
+                new->user_ns = get_user_ns(ns);
+
                 if (uids_user_create(new))
                         goto out_destoy_sched;
 
@@ -432,7 +445,6 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
                         up = new;
                 }
                 spin_unlock_irq(&uidhash_lock);
-
         }
 
         uids_mutex_unlock();
@@ -441,6 +453,7 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
 
 out_destoy_sched:
         sched_destroy_user(new);
+        put_user_ns(new->user_ns);
 out_free_user:
         kmem_cache_free(uid_cachep, new);
 out_unlock:
@@ -448,63 +461,6 @@ out_unlock:
         return NULL;
 }
 
-void switch_uid(struct user_struct *new_user)
-{
-        struct user_struct *old_user;
-
-        /* What if a process setreuid()'s and this brings the
-         * new uid over his NPROC rlimit?  We can check this now
-         * cheaply with the new uid cache, so if it matters
-         * we should be checking for it.  -DaveM
-         */
-        old_user = current->user;
-        atomic_inc(&new_user->processes);
-        atomic_dec(&old_user->processes);
-        switch_uid_keyring(new_user);
-        current->user = new_user;
-        sched_switch_user(current);
-
-        /*
-         * We need to synchronize with __sigqueue_alloc()
-         * doing a get_uid(p->user).. If that saw the old
-         * user value, we need to wait until it has exited
-         * its critical region before we can free the old
-         * structure.
-         */
-        smp_mb();
-        spin_unlock_wait(&current->sighand->siglock);
-
-        free_uid(old_user);
-        suid_keys(current);
-}
-
-#ifdef CONFIG_USER_NS
-void release_uids(struct user_namespace *ns)
-{
-        int i;
-        unsigned long flags;
-        struct hlist_head *head;
-        struct hlist_node *nd;
-
-        spin_lock_irqsave(&uidhash_lock, flags);
-        /*
-         * collapse the chains so that the user_struct-s will
-         * be still alive, but not in hashes. subsequent free_uid()
-         * will free them.
-         */
-        for (i = 0; i < UIDHASH_SZ; i++) {
-                head = ns->uidhash_table + i;
-                while (!hlist_empty(head)) {
-                        nd = head->first;
-                        hlist_del_init(nd);
-                }
-        }
-        spin_unlock_irqrestore(&uidhash_lock, flags);
-
-        free_uid(ns->root_user);
-}
-#endif
-
 static int __init uid_cache_init(void)
 {
         int n;
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 532858fa5b88..79084311ee57 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -9,60 +9,55 @@
 #include <linux/nsproxy.h>
 #include <linux/slab.h>
 #include <linux/user_namespace.h>
+#include <linux/cred.h>
 
 /*
- * Clone a new ns copying an original user ns, setting refcount to 1
- * @old_ns: namespace to clone
- * Return NULL on error (failure to kmalloc), new ns otherwise
+ * Create a new user namespace, deriving the creator from the user in the
+ * passed credentials, and replacing that user with the new root user for the
+ * new namespace.
+ *
+ * This is called by copy_creds(), which will finish setting the target task's
+ * credentials.
  */
-static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
+int create_user_ns(struct cred *new)
 {
         struct user_namespace *ns;
-        struct user_struct *new_user;
+        struct user_struct *root_user;
         int n;
 
         ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
         if (!ns)
-                return ERR_PTR(-ENOMEM);
+                return -ENOMEM;
 
         kref_init(&ns->kref);
 
         for (n = 0; n < UIDHASH_SZ; ++n)
                 INIT_HLIST_HEAD(ns->uidhash_table + n);
 
-        /* Insert new root user.  */
-        ns->root_user = alloc_uid(ns, 0);
-        if (!ns->root_user) {
+        /* Alloc new root user.  */
+        root_user = alloc_uid(ns, 0);
+        if (!root_user) {
                 kfree(ns);
-                return ERR_PTR(-ENOMEM);
+                return -ENOMEM;
         }
 
-        /* Reset current->user with a new one */
-        new_user = alloc_uid(ns, current->uid);
-        if (!new_user) {
-                free_uid(ns->root_user);
-                kfree(ns);
-                return ERR_PTR(-ENOMEM);
-        }
-
-        switch_uid(new_user);
-        return ns;
-}
-
-struct user_namespace * copy_user_ns(int flags, struct user_namespace *old_ns)
-{
-        struct user_namespace *new_ns;
-
-        BUG_ON(!old_ns);
-        get_user_ns(old_ns);
-
-        if (!(flags & CLONE_NEWUSER))
-                return old_ns;
+        /* set the new root user in the credentials under preparation */
+        ns->creator = new->user;
+        new->user = root_user;
+        new->uid = new->euid = new->suid = new->fsuid = 0;
+        new->gid = new->egid = new->sgid = new->fsgid = 0;
+        put_group_info(new->group_info);
+        new->group_info = get_group_info(&init_groups);
+#ifdef CONFIG_KEYS
+        key_put(new->request_key_auth);
+        new->request_key_auth = NULL;
+#endif
+        /* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */
 
-        new_ns = clone_user_ns(old_ns);
+        /* alloc_uid() incremented the userns refcount.  Just set it to 1 */
+        kref_set(&ns->kref, 1);
 
-        put_user_ns(old_ns);
-        return new_ns;
+        return 0;
 }
 
 void free_user_ns(struct kref *kref)
@@ -70,7 +65,7 @@ void free_user_ns(struct kref *kref)
         struct user_namespace *ns;
 
         ns = container_of(kref, struct user_namespace, kref);
-        release_uids(ns);
+        free_uid(ns->creator);
         kfree(ns);
 }
 EXPORT_SYMBOL(free_user_ns);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d4dc69ddebd7..4952322cba45 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -84,21 +84,21 @@ static cpumask_t cpu_singlethread_map __read_mostly;
 static cpumask_t cpu_populated_map __read_mostly;
 
 /* If it's single threaded, it isn't in the list of workqueues. */
-static inline int is_single_threaded(struct workqueue_struct *wq)
+static inline int is_wq_single_threaded(struct workqueue_struct *wq)
 {
         return wq->singlethread;
 }
 
 static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
 {
-        return is_single_threaded(wq)
+        return is_wq_single_threaded(wq)
                 ? &cpu_singlethread_map : &cpu_populated_map;
 }
 
 static
 struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)
 {
-        if (unlikely(is_single_threaded(wq)))
+        if (unlikely(is_wq_single_threaded(wq)))
                 cpu = singlethread_cpu;
         return per_cpu_ptr(wq->cpu_wq, cpu);
 }
@@ -769,7 +769,7 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
         struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
         struct workqueue_struct *wq = cwq->wq;
-        const char *fmt = is_single_threaded(wq) ? "%s" : "%s/%d";
+        const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
         struct task_struct *p;
 
         p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);