Merge branch 'linus' into tracing/sysprof

17 files changed, 330 insertions, 666 deletions

diff --git a/kernel/capability.c b/kernel/capability.c
index 39e8193b41ea..cfbe44299488 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -53,6 +53,69 @@ static void warn_legacy_capability_use(void)
 }
 
 /*
+ * Version 2 capabilities worked fine, but the linux/capability.h file
+ * that accompanied their introduction encouraged their use without
+ * the necessary user-space source code changes. As such, we have
+ * created a version 3 with equivalent functionality to version 2, but
+ * with a header change to protect legacy source code from using
+ * version 2 when it wanted to use version 1. If your system has code
+ * that trips the following warning, it is using version 2 specific
+ * capabilities and may be doing so insecurely.
+ *
+ * The remedy is to either upgrade your version of libcap (to 2.10+,
+ * if the application is linked against it), or recompile your
+ * application with modern kernel headers and this warning will go
+ * away.
+ */
+
+static void warn_deprecated_v2(void)
+{
+        static int warned;
+
+        if (!warned) {
+                char name[sizeof(current->comm)];
+
+                printk(KERN_INFO "warning: `%s' uses deprecated v2"
+                       " capabilities in a way that may be insecure.\n",
+                       get_task_comm(name, current));
+                warned = 1;
+        }
+}
+
+/*
+ * Version check. Return the number of u32s in each capability flag
+ * array, or a negative value on error.
+ */
+static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy)
+{
+        __u32 version;
+
+        if (get_user(version, &header->version))
+                return -EFAULT;
+
+        switch (version) {
+        case _LINUX_CAPABILITY_VERSION_1:
+                warn_legacy_capability_use();
+                *tocopy = _LINUX_CAPABILITY_U32S_1;
+                break;
+        case _LINUX_CAPABILITY_VERSION_2:
+                warn_deprecated_v2();
+                /*
+                 * fall through - v3 is otherwise equivalent to v2.
+                 */
+        case _LINUX_CAPABILITY_VERSION_3:
+                *tocopy = _LINUX_CAPABILITY_U32S_3;
+                break;
+        default:
+                if (put_user((u32)_KERNEL_CAPABILITY_VERSION, &header->version))
+                        return -EFAULT;
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+/*
  * For sys_getproccap() and sys_setproccap(), any of the three
  * capability set pointers may be NULL -- indicating that that set is
  * uninteresting and/or not to be changed.
@@ -71,27 +134,13 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
 {
         int ret = 0;
         pid_t pid;
-        __u32 version;
         struct task_struct *target;
         unsigned tocopy;
         kernel_cap_t pE, pI, pP;
 
-        if (get_user(version, &header->version))
-                return -EFAULT;
-
-        switch (version) {
-        case _LINUX_CAPABILITY_VERSION_1:
-                warn_legacy_capability_use();
-                tocopy = _LINUX_CAPABILITY_U32S_1;
-                break;
-        case _LINUX_CAPABILITY_VERSION_2:
-                tocopy = _LINUX_CAPABILITY_U32S_2;
-                break;
-        default:
-                if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
-                        return -EFAULT;
-                return -EINVAL;
-        }
+        ret = cap_validate_magic(header, &tocopy);
+        if (ret != 0)
+                return ret;
 
         if (get_user(pid, &header->pid))
                 return -EFAULT;
@@ -118,7 +167,7 @@ out:
         spin_unlock(&task_capability_lock);
 
         if (!ret) {
-                struct __user_cap_data_struct kdata[_LINUX_CAPABILITY_U32S];
+                struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
                 unsigned i;
 
                 for (i = 0; i < tocopy; i++) {
@@ -128,7 +177,7 @@ out:
                 }
 
                 /*
-                 * Note, in the case, tocopy < _LINUX_CAPABILITY_U32S,
+                 * Note, in the case, tocopy < _KERNEL_CAPABILITY_U32S,
                  * we silently drop the upper capabilities here. This
                  * has the effect of making older libcap
                  * implementations implicitly drop upper capability
@@ -240,30 +289,16 @@ static inline int cap_set_all(kernel_cap_t *effective,
  */
 asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
 {
-        struct __user_cap_data_struct kdata[_LINUX_CAPABILITY_U32S];
+        struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
         unsigned i, tocopy;
         kernel_cap_t inheritable, permitted, effective;
-        __u32 version;
         struct task_struct *target;
         int ret;
         pid_t pid;
 
-        if (get_user(version, &header->version))
-                return -EFAULT;
-
-        switch (version) {
-        case _LINUX_CAPABILITY_VERSION_1:
-                warn_legacy_capability_use();
-                tocopy = _LINUX_CAPABILITY_U32S_1;
-                break;
-        case _LINUX_CAPABILITY_VERSION_2:
-                tocopy = _LINUX_CAPABILITY_U32S_2;
-                break;
-        default:
-                if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
-                        return -EFAULT;
-                return -EINVAL;
-        }
+        ret = cap_validate_magic(header, &tocopy);
+        if (ret != 0)
+                return ret;
 
         if (get_user(pid, &header->pid))
                 return -EFAULT;
@@ -281,7 +316,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
                 permitted.cap[i] = kdata[i].permitted;
                 inheritable.cap[i] = kdata[i].inheritable;
         }
-        while (i < _LINUX_CAPABILITY_U32S) {
+        while (i < _KERNEL_CAPABILITY_U32S) {
                 effective.cap[i] = 0;
                 permitted.cap[i] = 0;
                 inheritable.cap[i] = 0;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index fbc6fc8949b4..15ac0e1e4f4d 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2903,7 +2903,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys)
         cg = tsk->cgroups;
         parent = task_cgroup(tsk, subsys->subsys_id);
 
-        snprintf(nodename, MAX_CGROUP_TYPE_NAMELEN, "node_%d", tsk->pid);
+        snprintf(nodename, MAX_CGROUP_TYPE_NAMELEN, "%d", tsk->pid);
 
         /* Pin the hierarchy */
         atomic_inc(&parent->root->sb->s_active);
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 86ea9e34e326..039baa4cd90c 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -797,8 +797,10 @@ static int update_cpumask(struct cpuset *cs, char *buf)
                 retval = cpulist_parse(buf, trialcs.cpus_allowed);
                 if (retval < 0)
                         return retval;
+
+                if (!cpus_subset(trialcs.cpus_allowed, cpu_online_map))
+                        return -EINVAL;
         }
-        cpus_and(trialcs.cpus_allowed, trialcs.cpus_allowed, cpu_online_map);
         retval = validate_change(cs, &trialcs);
         if (retval < 0)
                 return retval;
@@ -932,9 +934,11 @@ static int update_nodemask(struct cpuset *cs, char *buf)
                 retval = nodelist_parse(buf, trialcs.mems_allowed);
                 if (retval < 0)
                         goto done;
+
+                if (!nodes_subset(trialcs.mems_allowed,
+                                node_states[N_HIGH_MEMORY]))
+                        return -EINVAL;
         }
-        nodes_and(trialcs.mems_allowed, trialcs.mems_allowed,
-                                                node_states[N_HIGH_MEMORY]);
         oldmem = cs->mems_allowed;
         if (nodes_equal(oldmem, trialcs.mems_allowed)) {
                 retval = 0;             /* Too easy - nothing to do */
diff --git a/kernel/exit.c b/kernel/exit.c
index 1510f78a0ffa..8f6185e69b69 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -126,6 +126,12 @@ static void __exit_signal(struct task_struct *tsk)
 
         __unhash_process(tsk);
 
+        /*
+         * Do this under ->siglock, we can race with another thread
+         * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals.
+         */
+        flush_sigqueue(&tsk->pending);
+
         tsk->signal = NULL;
         tsk->sighand = NULL;
         spin_unlock(&sighand->siglock);
@@ -133,7 +139,6 @@ static void __exit_signal(struct task_struct *tsk)
 
         __cleanup_sighand(sighand);
         clear_tsk_thread_flag(tsk,TIF_SIGPENDING);
-        flush_sigqueue(&tsk->pending);
         if (sig) {
                 flush_sigqueue(&sig->shared_pending);
                 taskstats_tgid_free(sig);
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 14787de568b3..79e3c90113c2 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -52,6 +52,7 @@
 #include <asm/byteorder.h>
 #include <asm/atomic.h>
 #include <asm/system.h>
+#include <asm/unaligned.h>
 
 static int kgdb_break_asap;
 
@@ -227,8 +228,6 @@ void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
  * GDB remote protocol parser:
  */
 
-static const char       hexchars[] = "0123456789abcdef";
-
 static int hex(char ch)
 {
         if ((ch >= 'a') && (ch <= 'f'))
@@ -316,8 +315,8 @@ static void put_packet(char *buffer)
                 }
 
                 kgdb_io_ops->write_char('#');
-                kgdb_io_ops->write_char(hexchars[checksum >> 4]);
-                kgdb_io_ops->write_char(hexchars[checksum & 0xf]);
+                kgdb_io_ops->write_char(hex_asc_hi(checksum));
+                kgdb_io_ops->write_char(hex_asc_lo(checksum));
                 if (kgdb_io_ops->flush)
                         kgdb_io_ops->flush();
 
@@ -478,8 +477,8 @@ static void error_packet(char *pkt, int error)
 {
         error = -error;
         pkt[0] = 'E';
-        pkt[1] = hexchars[(error / 10)];
-        pkt[2] = hexchars[(error % 10)];
+        pkt[1] = hex_asc[(error / 10)];
+        pkt[2] = hex_asc[(error % 10)];
         pkt[3] = '\0';
 }
 
@@ -510,10 +509,7 @@ static void int_to_threadref(unsigned char *id, int value)
         scan = (unsigned char *)id;
         while (i--)
                 *scan++ = 0;
-        *scan++ = (value >> 24) & 0xff;
-        *scan++ = (value >> 16) & 0xff;
-        *scan++ = (value >> 8) & 0xff;
-        *scan++ = (value & 0xff);
+        put_unaligned_be32(value, scan);
 }
 
 static struct task_struct *getthread(struct pt_regs *regs, int tid)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1e0250cb9486..d4998f81e229 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -699,8 +699,9 @@ static int __register_kprobes(struct kprobe **kps, int num,
                 return -EINVAL;
         for (i = 0; i < num; i++) {
                 ret = __register_kprobe(kps[i], called_from);
-                if (ret < 0 && i > 0) {
-                        unregister_kprobes(kps, i);
+                if (ret < 0) {
+                        if (i > 0)
+                                unregister_kprobes(kps, i);
                         break;
                 }
         }
@@ -776,8 +777,9 @@ static int __register_jprobes(struct jprobe **jps, int num,
                         jp->kp.break_handler = longjmp_break_handler;
                         ret = __register_kprobe(&jp->kp, called_from);
                 }
-                if (ret < 0 && i > 0) {
-                        unregister_jprobes(jps, i);
+                if (ret < 0) {
+                        if (i > 0)
+                                unregister_jprobes(jps, i);
                         break;
                 }
         }
@@ -920,8 +922,9 @@ static int __register_kretprobes(struct kretprobe **rps, int num,
                 return -EINVAL;
         for (i = 0; i < num; i++) {
                 ret = __register_kretprobe(rps[i], called_from);
-                if (ret < 0 && i > 0) {
-                        unregister_kretprobes(rps, i);
+                if (ret < 0) {
+                        if (i > 0)
+                                unregister_kretprobes(rps, i);
                         break;
                 }
         }
diff --git a/kernel/module.c b/kernel/module.c
index f5e9491ef7ac..5f80478b746d 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1337,7 +1337,19 @@ out_unreg:
         kobject_put(&mod->mkobj.kobj);
         return err;
 }
-#endif
+
+static void mod_sysfs_fini(struct module *mod)
+{
+        kobject_put(&mod->mkobj.kobj);
+}
+
+#else /* CONFIG_SYSFS */
+
+static void mod_sysfs_fini(struct module *mod)
+{
+}
+
+#endif /* CONFIG_SYSFS */
 
 static void mod_kobject_remove(struct module *mod)
 {
@@ -1345,7 +1357,7 @@ static void mod_kobject_remove(struct module *mod)
         module_param_sysfs_remove(mod);
         kobject_put(mod->mkobj.drivers_dir);
         kobject_put(mod->holders_dir);
-        kobject_put(&mod->mkobj.kobj);
+        mod_sysfs_fini(mod);
 }
 
 /*
@@ -1780,7 +1792,7 @@ static struct module *load_module(void __user *umod,
 
         /* Sanity checks against insmoding binaries or wrong arch,
            weird elf version */
-        if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
+        if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
             || hdr->e_type != ET_REL
             || !elf_check_arch(hdr)
             || hdr->e_shentsize != sizeof(*sechdrs)) {
diff --git a/kernel/relay.c b/kernel/relay.c
index bc24dcdc570f..7de644cdec43 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1191,7 +1191,7 @@ static ssize_t relay_file_splice_read(struct file *in,
         ret = 0;
         spliced = 0;
 
-        while (len) {
+        while (len && !spliced) {
                 ret = subbuf_splice_actor(in, ppos, pipe, len, flags, &nonpad_ret);
                 if (ret < 0)
                         break;
diff --git a/kernel/sched.c b/kernel/sched.c
index e2e985eeee78..c994d12abbf6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -137,7 +137,7 @@ static inline void sg_inc_cpu_power(struct sched_group *sg, u32 val)
 
 static inline int rt_policy(int policy)
 {
-        if (unlikely(policy == SCHED_FIFO) || unlikely(policy == SCHED_RR))
+        if (unlikely(policy == SCHED_FIFO || policy == SCHED_RR))
                 return 1;
         return 0;
 }
@@ -313,12 +313,15 @@ static DEFINE_SPINLOCK(task_group_lock);
 #endif
 
 /*
- * A weight of 0, 1 or ULONG_MAX can cause arithmetics problems.
+ * A weight of 0 or 1 can cause arithmetics problems.
+ * A weight of a cfs_rq is the sum of weights of which entities
+ * are queued on this cfs_rq, so a weight of a entity should not be
+ * too large, so as the shares value of a task group.
  * (The default weight is 1024 - so there's no practical
  *  limitation from this.)
  */
 #define MIN_SHARES      2
-#define MAX_SHARES      (ULONG_MAX - 1)
+#define MAX_SHARES      (1UL << 18)
 
 static int init_task_group_load = INIT_TASK_GROUP_LOAD;
 #endif
@@ -399,43 +402,6 @@ struct cfs_rq {
          */
         struct list_head leaf_cfs_rq_list;
         struct task_group *tg;  /* group that "owns" this runqueue */
-
-#ifdef CONFIG_SMP
-        unsigned long task_weight;
-        unsigned long shares;
-        /*
-         * We need space to build a sched_domain wide view of the full task
-         * group tree, in order to avoid depending on dynamic memory allocation
-         * during the load balancing we place this in the per cpu task group
-         * hierarchy. This limits the load balancing to one instance per cpu,
-         * but more should not be needed anyway.
-         */
-        struct aggregate_struct {
-                /*
-                 *   load = weight(cpus) * f(tg)
-                 *
-                 * Where f(tg) is the recursive weight fraction assigned to
-                 * this group.
-                 */
-                unsigned long load;
-
-                /*
-                 * part of the group weight distributed to this span.
-                 */
-                unsigned long shares;
-
-                /*
-                 * The sum of all runqueue weights within this span.
-                 */
-                unsigned long rq_weight;
-
-                /*
-                 * Weight contributed by tasks; this is the part we can
-                 * influence by moving tasks around.
-                 */
-                unsigned long task_weight;
-        } aggregate;
-#endif
 #endif
 };
 
@@ -1387,17 +1353,19 @@ static void __resched_task(struct task_struct *p, int tif_bit)
  */
 #define SRR(x, y) (((x) + (1UL << ((y) - 1))) >> (y))
 
-/*
- * delta *= weight / lw
- */
 static unsigned long
 calc_delta_mine(unsigned long delta_exec, unsigned long weight,
                 struct load_weight *lw)
 {
         u64 tmp;
 
-        if (!lw->inv_weight)
-                lw->inv_weight = 1 + (WMULT_CONST-lw->weight/2)/(lw->weight+1);
+        if (!lw->inv_weight) {
+                if (BITS_PER_LONG > 32 && unlikely(lw->weight >= WMULT_CONST))
+                        lw->inv_weight = 1;
+                else
+                        lw->inv_weight = 1 + (WMULT_CONST-lw->weight/2)
+                                / (lw->weight+1);
+        }
 
         tmp = (u64)delta_exec * weight;
         /*
@@ -1412,6 +1380,12 @@ calc_delta_mine(unsigned long delta_exec, unsigned long weight,
         return (unsigned long)min(tmp, (u64)(unsigned long)LONG_MAX);
 }
 
+static inline unsigned long
+calc_delta_fair(unsigned long delta_exec, struct load_weight *lw)
+{
+        return calc_delta_mine(delta_exec, NICE_0_LOAD, lw);
+}
+
 static inline void update_load_add(struct load_weight *lw, unsigned long inc)
 {
         lw->weight += inc;
@@ -1524,326 +1498,6 @@ static unsigned long source_load(int cpu, int type);
 static unsigned long target_load(int cpu, int type);
 static unsigned long cpu_avg_load_per_task(int cpu);
 static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-
-/*
- * Group load balancing.
- *
- * We calculate a few balance domain wide aggregate numbers; load and weight.
- * Given the pictures below, and assuming each item has equal weight:
- *
- *         root          1 - thread
- *         / | \         A - group
- *        A  1  B
- *       /|\   / \
- *      C 2 D 3   4
- *      |   |
- *      5   6
- *
- * load:
- *    A and B get 1/3-rd of the total load. C and D get 1/3-rd of A's 1/3-rd,
- *    which equals 1/9-th of the total load.
- *
- * shares:
- *    The weight of this group on the selected cpus.
- *
- * rq_weight:
- *    Direct sum of all the cpu's their rq weight, e.g. A would get 3 while
- *    B would get 2.
- *
- * task_weight:
- *    Part of the rq_weight contributed by tasks; all groups except B would
- *    get 1, B gets 2.
- */
-
-static inline struct aggregate_struct *
-aggregate(struct task_group *tg, struct sched_domain *sd)
-{
-        return &tg->cfs_rq[sd->first_cpu]->aggregate;
-}
-
-typedef void (*aggregate_func)(struct task_group *, struct sched_domain *);
-
-/*
- * Iterate the full tree, calling @down when first entering a node and @up when
- * leaving it for the final time.
- */
-static
-void aggregate_walk_tree(aggregate_func down, aggregate_func up,
-                         struct sched_domain *sd)
-{
-        struct task_group *parent, *child;
-
-        rcu_read_lock();
-        parent = &root_task_group;
-down:
-        (*down)(parent, sd);
-        list_for_each_entry_rcu(child, &parent->children, siblings) {
-                parent = child;
-                goto down;
-
-up:
-                continue;
-        }
-        (*up)(parent, sd);
-
-        child = parent;
-        parent = parent->parent;
-        if (parent)
-                goto up;
-        rcu_read_unlock();
-}
-
-/*
- * Calculate the aggregate runqueue weight.
- */
-static
-void aggregate_group_weight(struct task_group *tg, struct sched_domain *sd)
-{
-        unsigned long rq_weight = 0;
-        unsigned long task_weight = 0;
-        int i;
-
-        for_each_cpu_mask(i, sd->span) {
-                rq_weight += tg->cfs_rq[i]->load.weight;
-                task_weight += tg->cfs_rq[i]->task_weight;
-        }
-
-        aggregate(tg, sd)->rq_weight = rq_weight;
-        aggregate(tg, sd)->task_weight = task_weight;
-}
-
-/*
- * Compute the weight of this group on the given cpus.
- */
-static
-void aggregate_group_shares(struct task_group *tg, struct sched_domain *sd)
-{
-        unsigned long shares = 0;
-        int i;
-
-        for_each_cpu_mask(i, sd->span)
-                shares += tg->cfs_rq[i]->shares;
-
-        if ((!shares && aggregate(tg, sd)->rq_weight) || shares > tg->shares)
-                shares = tg->shares;
-
-        aggregate(tg, sd)->shares = shares;
-}
-
-/*
- * Compute the load fraction assigned to this group, relies on the aggregate
- * weight and this group's parent's load, i.e. top-down.
- */
-static
-void aggregate_group_load(struct task_group *tg, struct sched_domain *sd)
-{
-        unsigned long load;
-
-        if (!tg->parent) {
-                int i;
-
-                load = 0;
-                for_each_cpu_mask(i, sd->span)
-                        load += cpu_rq(i)->load.weight;
-
-        } else {
-                load = aggregate(tg->parent, sd)->load;
-
-                /*
-                 * shares is our weight in the parent's rq so
-                 * shares/parent->rq_weight gives our fraction of the load
-                 */
-                load *= aggregate(tg, sd)->shares;
-                load /= aggregate(tg->parent, sd)->rq_weight + 1;
-        }
-
-        aggregate(tg, sd)->load = load;
-}
-
-static void __set_se_shares(struct sched_entity *se, unsigned long shares);
-
-/*
- * Calculate and set the cpu's group shares.
- */
-static void
-__update_group_shares_cpu(struct task_group *tg, struct sched_domain *sd,
-                          int tcpu)
-{
-        int boost = 0;
-        unsigned long shares;
-        unsigned long rq_weight;
-
-        if (!tg->se[tcpu])
-                return;
-
-        rq_weight = tg->cfs_rq[tcpu]->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;
-        }
-
-        /*
-         *           \Sum shares * rq_weight
-         * shares =  -----------------------
-         *               \Sum rq_weight
-         *
-         */
-        shares = aggregate(tg, sd)->shares * rq_weight;
-        shares /= aggregate(tg, sd)->rq_weight + 1;
-
-        /*
-         * record the actual number of shares, not the boosted amount.
-         */
-        tg->cfs_rq[tcpu]->shares = boost ? 0 : shares;
-
-        if (shares < MIN_SHARES)
-                shares = MIN_SHARES;
-        else if (shares > MAX_SHARES)
-                shares = MAX_SHARES;
-
-        __set_se_shares(tg->se[tcpu], shares);
-}
-
-/*
- * Re-adjust the weights on the cpu the task came from and on the cpu the
- * task went to.
- */
-static void
-__move_group_shares(struct task_group *tg, struct sched_domain *sd,
-                    int scpu, int dcpu)
-{
-        unsigned long shares;
-
-        shares = tg->cfs_rq[scpu]->shares + tg->cfs_rq[dcpu]->shares;
-
-        __update_group_shares_cpu(tg, sd, scpu);
-        __update_group_shares_cpu(tg, sd, dcpu);
-
-        /*
-         * ensure we never loose shares due to rounding errors in the
-         * above redistribution.
-         */
-        shares -= tg->cfs_rq[scpu]->shares + tg->cfs_rq[dcpu]->shares;
-        if (shares)
-                tg->cfs_rq[dcpu]->shares += shares;
-}
-
-/*
- * Because changing a group's shares changes the weight of the super-group
- * we need to walk up the tree and change all shares until we hit the root.
- */
-static void
-move_group_shares(struct task_group *tg, struct sched_domain *sd,
-                  int scpu, int dcpu)
-{
-        while (tg) {
-                __move_group_shares(tg, sd, scpu, dcpu);
-                tg = tg->parent;
-        }
-}
-
-static
-void aggregate_group_set_shares(struct task_group *tg, struct sched_domain *sd)
-{
-        unsigned long shares = aggregate(tg, sd)->shares;
-        int i;
-
-        for_each_cpu_mask(i, sd->span) {
-                struct rq *rq = cpu_rq(i);
-                unsigned long flags;
-
-                spin_lock_irqsave(&rq->lock, flags);
-                __update_group_shares_cpu(tg, sd, i);
-                spin_unlock_irqrestore(&rq->lock, flags);
-        }
-
-        aggregate_group_shares(tg, sd);
-
-        /*
-         * ensure we never loose shares due to rounding errors in the
-         * above redistribution.
-         */
-        shares -= aggregate(tg, sd)->shares;
-        if (shares) {
-                tg->cfs_rq[sd->first_cpu]->shares += shares;
-                aggregate(tg, sd)->shares += shares;
-        }
-}
-
-/*
- * Calculate the accumulative weight and recursive load of each task group
- * while walking down the tree.
- */
-static
-void aggregate_get_down(struct task_group *tg, struct sched_domain *sd)
-{
-        aggregate_group_weight(tg, sd);
-        aggregate_group_shares(tg, sd);
-        aggregate_group_load(tg, sd);
-}
-
-/*
- * Rebalance the cpu shares while walking back up the tree.
- */
-static
-void aggregate_get_up(struct task_group *tg, struct sched_domain *sd)
-{
-        aggregate_group_set_shares(tg, sd);
-}
-
-static DEFINE_PER_CPU(spinlock_t, aggregate_lock);
-
-static void __init init_aggregate(void)
-{
-        int i;
-
-        for_each_possible_cpu(i)
-                spin_lock_init(&per_cpu(aggregate_lock, i));
-}
-
-static int get_aggregate(struct sched_domain *sd)
-{
-        if (!spin_trylock(&per_cpu(aggregate_lock, sd->first_cpu)))
-                return 0;
-
-        aggregate_walk_tree(aggregate_get_down, aggregate_get_up, sd);
-        return 1;
-}
-
-static void put_aggregate(struct sched_domain *sd)
-{
-        spin_unlock(&per_cpu(aggregate_lock, sd->first_cpu));
-}
-
-static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
-{
-        cfs_rq->shares = shares;
-}
-
-#else
-
-static inline void init_aggregate(void)
-{
-}
-
-static inline int get_aggregate(struct sched_domain *sd)
-{
-        return 0;
-}
-
-static inline void put_aggregate(struct sched_domain *sd)
-{
-}
-#endif
-
 #else /* CONFIG_SMP */
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1864,14 +1518,26 @@ static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
 
 #define sched_class_highest (&rt_sched_class)
 
-static void inc_nr_running(struct rq *rq)
+static inline void inc_load(struct rq *rq, const struct task_struct *p)
+{
+        update_load_add(&rq->load, p->se.load.weight);
+}
+
+static inline void dec_load(struct rq *rq, const struct task_struct *p)
+{
+        update_load_sub(&rq->load, p->se.load.weight);
+}
+
+static void inc_nr_running(struct task_struct *p, struct rq *rq)
 {
         rq->nr_running++;
+        inc_load(rq, p);
 }
 
-static void dec_nr_running(struct rq *rq)
+static void dec_nr_running(struct task_struct *p, struct rq *rq)
 {
         rq->nr_running--;
+        dec_load(rq, p);
 }
 
 static void set_load_weight(struct task_struct *p)
@@ -1963,7 +1629,7 @@ static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
                 rq->nr_uninterruptible--;
 
         enqueue_task(rq, p, wakeup);
-        inc_nr_running(rq);
+        inc_nr_running(p, rq);
 }
 
 /*
@@ -1975,7 +1641,7 @@ static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
                 rq->nr_uninterruptible++;
 
         dequeue_task(rq, p, sleep);
-        dec_nr_running(rq);
+        dec_nr_running(p, rq);
 }
 
 /**
@@ -2631,7 +2297,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
                  * management (if any):
                  */
                 p->sched_class->task_new(rq, p);
-                inc_nr_running(rq);
+                inc_nr_running(p, rq);
         }
         trace_mark(kernel_sched_wakeup_new,
                 "pid %d state %ld ## rq %p task %p rq->curr %p",
@@ -3630,12 +3296,9 @@ static int load_balance(int this_cpu, struct rq *this_rq,
         unsigned long imbalance;
         struct rq *busiest;
         unsigned long flags;
-        int unlock_aggregate;
 
         cpus_setall(*cpus);
 
-        unlock_aggregate = get_aggregate(sd);
-
         /*
          * When power savings policy is enabled for the parent domain, idle
          * sibling can pick up load irrespective of busy siblings. In this case,
@@ -3751,9 +3414,8 @@ redo:
 
         if (!ld_moved && !sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
             !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                ld_moved = -1;
-
-        goto out;
+                return -1;
+        return ld_moved;
 
 out_balanced:
         schedstat_inc(sd, lb_balanced[idle]);
@@ -3768,13 +3430,8 @@ out_one_pinned:
 
         if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
             !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                ld_moved = -1;
-        else
-                ld_moved = 0;
-out:
-        if (unlock_aggregate)
-                put_aggregate(sd);
-        return ld_moved;
+                return -1;
+        return 0;
 }
 
 /*
@@ -4481,7 +4138,7 @@ static inline void schedule_debug(struct task_struct *prev)
          * schedule() atomically, we ignore that path for now.
          * Otherwise, whine if we are scheduling when we should not be.
          */
-        if (unlikely(in_atomic_preempt_off()) && unlikely(!prev->exit_state))
+        if (unlikely(in_atomic_preempt_off() && !prev->exit_state))
                 __schedule_bug(prev);
 
         profile_hit(SCHED_PROFILING, __builtin_return_address(0));
@@ -4561,12 +4218,10 @@ need_resched_nonpreemptible:
         clear_tsk_need_resched(prev);
 
         if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
-                if (unlikely((prev->state & TASK_INTERRUPTIBLE) &&
-                                signal_pending(prev))) {
+                if (unlikely(signal_pending_state(prev->state, prev)))
                         prev->state = TASK_RUNNING;
-                } else {
+                else
                         deactivate_task(rq, prev, 1);
-                }
                 switch_count = &prev->nvcsw;
         }
 
@@ -4982,8 +4637,10 @@ void set_user_nice(struct task_struct *p, long nice)
                 goto out_unlock;
         }
         on_rq = p->se.on_rq;
-        if (on_rq)
+        if (on_rq) {
                 dequeue_task(rq, p, 0);
+                dec_load(rq, p);
+        }
 
         p->static_prio = NICE_TO_PRIO(nice);
         set_load_weight(p);
@@ -4993,6 +4650,7 @@ void set_user_nice(struct task_struct *p, long nice)
 
         if (on_rq) {
                 enqueue_task(rq, p, 0);
+                inc_load(rq, p);
                 /*
                  * If the task increased its priority or is running and
                  * lowered its priority, then reschedule its CPU:
@@ -7367,7 +7025,6 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                         SD_INIT(sd, ALLNODES);
                         set_domain_attribute(sd, attr);
                         sd->span = *cpu_map;
-                        sd->first_cpu = first_cpu(sd->span);
                         cpu_to_allnodes_group(i, cpu_map, &sd->groups, tmpmask);
                         p = sd;
                         sd_allnodes = 1;
@@ -7378,7 +7035,6 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 SD_INIT(sd, NODE);
                 set_domain_attribute(sd, attr);
                 sched_domain_node_span(cpu_to_node(i), &sd->span);
-                sd->first_cpu = first_cpu(sd->span);
                 sd->parent = p;
                 if (p)
                         p->child = sd;
@@ -7390,7 +7046,6 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 SD_INIT(sd, CPU);
                 set_domain_attribute(sd, attr);
                 sd->span = *nodemask;
-                sd->first_cpu = first_cpu(sd->span);
                 sd->parent = p;
                 if (p)
                         p->child = sd;
@@ -7402,7 +7057,6 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 SD_INIT(sd, MC);
                 set_domain_attribute(sd, attr);
                 sd->span = cpu_coregroup_map(i);
-                sd->first_cpu = first_cpu(sd->span);
                 cpus_and(sd->span, sd->span, *cpu_map);
                 sd->parent = p;
                 p->child = sd;
@@ -7415,7 +7069,6 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
                 SD_INIT(sd, SIBLING);
                 set_domain_attribute(sd, attr);
                 sd->span = per_cpu(cpu_sibling_map, i);
-                sd->first_cpu = first_cpu(sd->span);
                 cpus_and(sd->span, sd->span, *cpu_map);
                 sd->parent = p;
                 p->child = sd;
@@ -7619,8 +7272,8 @@ static int build_sched_domains(const cpumask_t *cpu_map)
 
 static cpumask_t *doms_cur;     /* current sched domains */
 static int ndoms_cur;           /* number of sched domains in 'doms_cur' */
-static struct sched_domain_attr *dattr_cur;     /* attribues of custom domains
-                                                   in 'doms_cur' */
+static struct sched_domain_attr *dattr_cur;
+                                /* attribues of custom domains in 'doms_cur' */
 
 /*
  * Special case: If a kmalloc of a doms_cur partition (array of
@@ -8085,7 +7738,6 @@ void __init sched_init(void)
         }
 
 #ifdef CONFIG_SMP
-        init_aggregate();
         init_defrootdomain();
 #endif
 
@@ -8650,11 +8302,14 @@ void sched_move_task(struct task_struct *tsk)
 #endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-static void __set_se_shares(struct sched_entity *se, unsigned long shares)
+static void set_se_shares(struct sched_entity *se, unsigned long shares)
 {
         struct cfs_rq *cfs_rq = se->cfs_rq;
+        struct rq *rq = cfs_rq->rq;
         int on_rq;
 
+        spin_lock_irq(&rq->lock);
+
         on_rq = se->on_rq;
         if (on_rq)
                 dequeue_entity(cfs_rq, se, 0);
@@ -8664,17 +8319,8 @@ static void __set_se_shares(struct sched_entity *se, unsigned long shares)
 
         if (on_rq)
                 enqueue_entity(cfs_rq, se, 0);
-}
 
-static void set_se_shares(struct sched_entity *se, unsigned long shares)
-{
-        struct cfs_rq *cfs_rq = se->cfs_rq;
-        struct rq *rq = cfs_rq->rq;
-        unsigned long flags;
-
-        spin_lock_irqsave(&rq->lock, flags);
-        __set_se_shares(se, shares);
-        spin_unlock_irqrestore(&rq->lock, flags);
+        spin_unlock_irq(&rq->lock);
 }
 
 static DEFINE_MUTEX(shares_mutex);
@@ -8713,13 +8359,8 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
          * w/o tripping rebalance_share or load_balance_fair.
          */
         tg->shares = shares;
-        for_each_possible_cpu(i) {
-                /*
-                 * force a rebalance
-                 */
-                cfs_rq_set_shares(tg->cfs_rq[i], 0);
+        for_each_possible_cpu(i)
                 set_se_shares(tg->se[i], shares);
-        }
 
         /*
          * Enable load balance activity on this group, by inserting it back on
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 9c597e37f7de..ce05271219ab 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -59,22 +59,26 @@ static inline struct sched_clock_data *cpu_sdc(int cpu)
         return &per_cpu(sched_clock_data, cpu);
 }
 
+static __read_mostly int sched_clock_running;
+
 void sched_clock_init(void)
 {
         u64 ktime_now = ktime_to_ns(ktime_get());
-        u64 now = 0;
+        unsigned long now_jiffies = jiffies;
         int cpu;
 
         for_each_possible_cpu(cpu) {
                 struct sched_clock_data *scd = cpu_sdc(cpu);
 
                 scd->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
-                scd->prev_jiffies = jiffies;
-                scd->prev_raw = now;
-                scd->tick_raw = now;
+                scd->prev_jiffies = now_jiffies;
+                scd->prev_raw = 0;
+                scd->tick_raw = 0;
                 scd->tick_gtod = ktime_now;
                 scd->clock = ktime_now;
         }
+
+        sched_clock_running = 1;
 }
 
 /*
@@ -136,6 +140,9 @@ u64 sched_clock_cpu(int cpu)
         struct sched_clock_data *scd = cpu_sdc(cpu);
         u64 now, clock;
 
+        if (unlikely(!sched_clock_running))
+                return 0ull;
+
         WARN_ON_ONCE(!irqs_disabled());
         now = sched_clock();
 
@@ -174,6 +181,9 @@ void sched_clock_tick(void)
         struct sched_clock_data *scd = this_scd();
         u64 now, now_gtod;
 
+        if (unlikely(!sched_clock_running))
+                return;
+
         WARN_ON_ONCE(!irqs_disabled());
 
         now = sched_clock();
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 5f06118fbc31..8bb713040ac9 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -167,11 +167,6 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 #endif
         SEQ_printf(m, "  .%-30s: %ld\n", "nr_spread_over",
                         cfs_rq->nr_spread_over);
-#ifdef CONFIG_FAIR_GROUP_SCHED
-#ifdef CONFIG_SMP
-        SEQ_printf(m, "  .%-30s: %lu\n", "shares", cfs_rq->shares);
-#endif
-#endif
 }
 
 static void print_cpu(struct seq_file *m, int cpu)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index e24ecd39c4b8..08ae848b71d4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -334,34 +334,6 @@ int sched_nr_latency_handler(struct ctl_table *table, int write,
 #endif
 
 /*
- * delta *= w / rw
- */
-static inline unsigned long
-calc_delta_weight(unsigned long delta, struct sched_entity *se)
-{
-        for_each_sched_entity(se) {
-                delta = calc_delta_mine(delta,
-                                se->load.weight, &cfs_rq_of(se)->load);
-        }
-
-        return delta;
-}
-
-/*
- * delta *= rw / w
- */
-static inline unsigned long
-calc_delta_fair(unsigned long delta, struct sched_entity *se)
-{
-        for_each_sched_entity(se) {
-                delta = calc_delta_mine(delta,
-                                cfs_rq_of(se)->load.weight, &se->load);
-        }
-
-        return delta;
-}
-
-/*
  * The idea is to set a period in which each task runs once.
  *
  * When there are too many tasks (sysctl_sched_nr_latency) we have to stretch
@@ -390,54 +362,47 @@ static u64 __sched_period(unsigned long nr_running)
  */
 static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-        return calc_delta_weight(__sched_period(cfs_rq->nr_running), se);
+        u64 slice = __sched_period(cfs_rq->nr_running);
+
+        for_each_sched_entity(se) {
+                cfs_rq = cfs_rq_of(se);
+
+                slice *= se->load.weight;
+                do_div(slice, cfs_rq->load.weight);
+        }
+
+
+        return slice;
 }
 
 /*
  * We calculate the vruntime slice of a to be inserted task
  *
- * vs = s*rw/w = p
+ * vs = s/w = p/rw
  */
 static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
         unsigned long nr_running = cfs_rq->nr_running;
+        unsigned long weight;
+        u64 vslice;
 
         if (!se->on_rq)
                 nr_running++;
 
-        return __sched_period(nr_running);
-}
-
-/*
- * The goal of calc_delta_asym() is to be asymmetrically around NICE_0_LOAD, in
- * that it favours >=0 over <0.
- *
- *   -20         |
- *               |
- *     0 --------+-------
- *             .'
- *    19     .'
- *
- */
-static unsigned long
-calc_delta_asym(unsigned long delta, struct sched_entity *se)
-{
-        struct load_weight lw = {
-                .weight = NICE_0_LOAD,
-                .inv_weight = 1UL << (WMULT_SHIFT-NICE_0_SHIFT)
-        };
+        vslice = __sched_period(nr_running);
 
         for_each_sched_entity(se) {
-                struct load_weight *se_lw = &se->load;
+                cfs_rq = cfs_rq_of(se);
 
-                if (se->load.weight < NICE_0_LOAD)
-                        se_lw = &lw;
+                weight = cfs_rq->load.weight;
+                if (!se->on_rq)
+                        weight += se->load.weight;
 
-                delta = calc_delta_mine(delta,
-                                cfs_rq_of(se)->load.weight, se_lw);
+                vslice *= NICE_0_LOAD;
+                do_div(vslice, weight);
         }
 
-        return delta;
+        return vslice;
 }
 
 /*
@@ -454,7 +419,11 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
 
         curr->sum_exec_runtime += delta_exec;
         schedstat_add(cfs_rq, exec_clock, delta_exec);
-        delta_exec_weighted = calc_delta_fair(delta_exec, curr);
+        delta_exec_weighted = delta_exec;
+        if (unlikely(curr->load.weight != NICE_0_LOAD)) {
+                delta_exec_weighted = calc_delta_fair(delta_exec_weighted,
+                                                        &curr->load);
+        }
         curr->vruntime += delta_exec_weighted;
 }
 
@@ -541,27 +510,10 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
  * Scheduling class queueing methods:
  */
 
-#if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED
-static void
-add_cfs_task_weight(struct cfs_rq *cfs_rq, unsigned long weight)
-{
-        cfs_rq->task_weight += weight;
-}
-#else
-static inline void
-add_cfs_task_weight(struct cfs_rq *cfs_rq, unsigned long weight)
-{
-}
-#endif
-
 static void
 account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
         update_load_add(&cfs_rq->load, se->load.weight);
-        if (!parent_entity(se))
-                inc_cpu_load(rq_of(cfs_rq), se->load.weight);
-        if (entity_is_task(se))
-                add_cfs_task_weight(cfs_rq, se->load.weight);
         cfs_rq->nr_running++;
         se->on_rq = 1;
         list_add(&se->group_node, &cfs_rq->tasks);
@@ -571,10 +523,6 @@ static void
 account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
         update_load_sub(&cfs_rq->load, se->load.weight);
-        if (!parent_entity(se))
-                dec_cpu_load(rq_of(cfs_rq), se->load.weight);
-        if (entity_is_task(se))
-                add_cfs_task_weight(cfs_rq, -se->load.weight);
         cfs_rq->nr_running--;
         se->on_rq = 0;
         list_del_init(&se->group_node);
@@ -661,17 +609,8 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 
         if (!initial) {
                 /* sleeps upto a single latency don't count. */
-                if (sched_feat(NEW_FAIR_SLEEPERS)) {
-                        unsigned long thresh = sysctl_sched_latency;
-
-                        /*
-                         * convert the sleeper threshold into virtual time
-                         */
-                        if (sched_feat(NORMALIZED_SLEEPER))
-                                thresh = calc_delta_fair(thresh, se);
-
-                        vruntime -= thresh;
-                }
+                if (sched_feat(NEW_FAIR_SLEEPERS))
+                        vruntime -= sysctl_sched_latency;
 
                 /* ensure we never gain time by being placed backwards. */
                 vruntime = max_vruntime(se->vruntime, vruntime);
@@ -1057,16 +996,27 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
         struct task_struct *curr = this_rq->curr;
         unsigned long tl = this_load;
         unsigned long tl_per_task;
+        int balanced;
 
-        if (!(this_sd->flags & SD_WAKE_AFFINE))
+        if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
                 return 0;
 
         /*
+         * If sync wakeup then subtract the (maximum possible)
+         * effect of the currently running task from the load
+         * of the current CPU:
+         */
+        if (sync)
+                tl -= current->se.load.weight;
+
+        balanced = 100*(tl + p->se.load.weight) <= imbalance*load;
+
+        /*
          * If the currently running task will sleep within
          * a reasonable amount of time then attract this newly
          * woken task:
          */
-        if (sync && curr->sched_class == &fair_sched_class) {
+        if (sync && balanced && curr->sched_class == &fair_sched_class) {
                 if (curr->se.avg_overlap < sysctl_sched_migration_cost &&
                                 p->se.avg_overlap < sysctl_sched_migration_cost)
                         return 1;
@@ -1075,16 +1025,8 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
         schedstat_inc(p, se.nr_wakeups_affine_attempts);
         tl_per_task = cpu_avg_load_per_task(this_cpu);
 
-        /*
-         * If sync wakeup then subtract the (maximum possible)
-         * effect of the currently running task from the load
-         * of the current CPU:
-         */
-        if (sync)
-                tl -= current->se.load.weight;
-
         if ((tl <= load && tl + target_load(prev_cpu, idx) <= tl_per_task) ||
-                        100*(tl + p->se.load.weight) <= imbalance*load) {
+                        balanced) {
                 /*
                  * This domain has SD_WAKE_AFFINE and
                  * p is cache cold in this domain, and
@@ -1169,10 +1111,11 @@ static unsigned long wakeup_gran(struct sched_entity *se)
         unsigned long gran = sysctl_sched_wakeup_granularity;
 
         /*
-         * More easily preempt - nice tasks, while not making it harder for
-         * + nice tasks.
+         * More easily preempt - nice tasks, while not making
+         * it harder for + nice tasks.
          */
-        gran = calc_delta_asym(sysctl_sched_wakeup_granularity, se);
+        if (unlikely(se->load.weight > NICE_0_LOAD))
+                gran = calc_delta_fair(gran, &se->load);
 
         return gran;
 }
@@ -1366,90 +1309,75 @@ static struct task_struct *load_balance_next_fair(void *arg)
         return __load_balance_iterator(cfs_rq, cfs_rq->balance_iterator);
 }
 
-static unsigned long
-__load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                unsigned long max_load_move, struct sched_domain *sd,
-                enum cpu_idle_type idle, int *all_pinned, int *this_best_prio,
-                struct cfs_rq *cfs_rq)
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static int cfs_rq_best_prio(struct cfs_rq *cfs_rq)
 {
-        struct rq_iterator cfs_rq_iterator;
+        struct sched_entity *curr;
+        struct task_struct *p;
 
-        cfs_rq_iterator.start = load_balance_start_fair;
-        cfs_rq_iterator.next = load_balance_next_fair;
-        cfs_rq_iterator.arg = cfs_rq;
+        if (!cfs_rq->nr_running || !first_fair(cfs_rq))
+                return MAX_PRIO;
+
+        curr = cfs_rq->curr;
+        if (!curr)
+                curr = __pick_next_entity(cfs_rq);
+
+        p = task_of(curr);
 
-        return balance_tasks(this_rq, this_cpu, busiest,
-                        max_load_move, sd, idle, all_pinned,
-                        this_best_prio, &cfs_rq_iterator);
+        return p->prio;
 }
+#endif
 
-#ifdef CONFIG_FAIR_GROUP_SCHED
 static unsigned long
 load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
                   unsigned long max_load_move,
                   struct sched_domain *sd, enum cpu_idle_type idle,
                   int *all_pinned, int *this_best_prio)
 {
+        struct cfs_rq *busy_cfs_rq;
         long rem_load_move = max_load_move;
-        int busiest_cpu = cpu_of(busiest);
-        struct task_group *tg;
-
-        rcu_read_lock();
-        list_for_each_entry(tg, &task_groups, list) {
-                long imbalance;
-                unsigned long this_weight, busiest_weight;
-                long rem_load, max_load, moved_load;
-
-                /*
-                 * empty group
-                 */
-                if (!aggregate(tg, sd)->task_weight)
-                        continue;
-
-                rem_load = rem_load_move * aggregate(tg, sd)->rq_weight;
-                rem_load /= aggregate(tg, sd)->load + 1;
-
-                this_weight = tg->cfs_rq[this_cpu]->task_weight;
-                busiest_weight = tg->cfs_rq[busiest_cpu]->task_weight;
+        struct rq_iterator cfs_rq_iterator;
 
-                imbalance = (busiest_weight - this_weight) / 2;
+        cfs_rq_iterator.start = load_balance_start_fair;
+        cfs_rq_iterator.next = load_balance_next_fair;
 
-                if (imbalance < 0)
-                        imbalance = busiest_weight;
+        for_each_leaf_cfs_rq(busiest, busy_cfs_rq) {
+#ifdef CONFIG_FAIR_GROUP_SCHED
+                struct cfs_rq *this_cfs_rq;
+                long imbalance;
+                unsigned long maxload;
 
-                max_load = max(rem_load, imbalance);
-                moved_load = __load_balance_fair(this_rq, this_cpu, busiest,
-                                max_load, sd, idle, all_pinned, this_best_prio,
-                                tg->cfs_rq[busiest_cpu]);
+                this_cfs_rq = cpu_cfs_rq(busy_cfs_rq, this_cpu);
 
-                if (!moved_load)
+                imbalance = busy_cfs_rq->load.weight - this_cfs_rq->load.weight;
+                /* Don't pull if this_cfs_rq has more load than busy_cfs_rq */
+                if (imbalance <= 0)
                         continue;
 
-                move_group_shares(tg, sd, busiest_cpu, this_cpu);
+                /* Don't pull more than imbalance/2 */
+                imbalance /= 2;
+                maxload = min(rem_load_move, imbalance);
 
-                moved_load *= aggregate(tg, sd)->load;
-                moved_load /= aggregate(tg, sd)->rq_weight + 1;
+                *this_best_prio = cfs_rq_best_prio(this_cfs_rq);
+#else
+# define maxload rem_load_move
+#endif
+                /*
+                 * pass busy_cfs_rq argument into
+                 * load_balance_[start|next]_fair iterators
+                 */
+                cfs_rq_iterator.arg = busy_cfs_rq;
+                rem_load_move -= balance_tasks(this_rq, this_cpu, busiest,
+                                               maxload, sd, idle, all_pinned,
+                                               this_best_prio,
+                                               &cfs_rq_iterator);
 
-                rem_load_move -= moved_load;
-                if (rem_load_move < 0)
+                if (rem_load_move <= 0)
                         break;
         }
-        rcu_read_unlock();
 
         return max_load_move - rem_load_move;
 }
-#else
-static unsigned long
-load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                  unsigned long max_load_move,
-                  struct sched_domain *sd, enum cpu_idle_type idle,
-                  int *all_pinned, int *this_best_prio)
-{
-        return __load_balance_fair(this_rq, this_cpu, busiest,
-                        max_load_move, sd, idle, all_pinned,
-                        this_best_prio, &busiest->cfs);
-}
-#endif
 
 static int
 move_one_task_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 060e87b0cb1c..3432d573205d 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -513,8 +513,6 @@ static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
          */
         for_each_sched_rt_entity(rt_se)
                 enqueue_rt_entity(rt_se);
-
-        inc_cpu_load(rq, p->se.load.weight);
 }
 
 static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
@@ -534,8 +532,6 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
                 if (rt_rq && rt_rq->rt_nr_running)
                         enqueue_rt_entity(rt_se);
         }
-
-        dec_cpu_load(rq, p->se.load.weight);
 }
 
 /*
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 5bae2e0c3ff2..a38878e0e49d 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -67,6 +67,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
                 preempt_enable();
 #endif
         }
+        kfree(mask_str);
         return 0;
 }
 
diff --git a/kernel/signal.c b/kernel/signal.c
index 72bb4f51f963..6c0958e52ea7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -231,6 +231,40 @@ void flush_signals(struct task_struct *t)
         spin_unlock_irqrestore(&t->sighand->siglock, flags);
 }
 
+static void __flush_itimer_signals(struct sigpending *pending)
+{
+        sigset_t signal, retain;
+        struct sigqueue *q, *n;
+
+        signal = pending->signal;
+        sigemptyset(&retain);
+
+        list_for_each_entry_safe(q, n, &pending->list, list) {
+                int sig = q->info.si_signo;
+
+                if (likely(q->info.si_code != SI_TIMER)) {
+                        sigaddset(&retain, sig);
+                } else {
+                        sigdelset(&signal, sig);
+                        list_del_init(&q->list);
+                        __sigqueue_free(q);
+                }
+        }
+
+        sigorsets(&pending->signal, &signal, &retain);
+}
+
+void flush_itimer_signals(void)
+{
+        struct task_struct *tsk = current;
+        unsigned long flags;
+
+        spin_lock_irqsave(&tsk->sighand->siglock, flags);
+        __flush_itimer_signals(&tsk->pending);
+        __flush_itimer_signals(&tsk->signal->shared_pending);
+        spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
+}
+
 void ignore_signals(struct task_struct *t)
 {
         int i;
@@ -1240,17 +1274,22 @@ void sigqueue_free(struct sigqueue *q)
 
         BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
         /*
-         * If the signal is still pending remove it from the
-         * pending queue. We must hold ->siglock while testing
-         * q->list to serialize with collect_signal().
+         * We must hold ->siglock while testing q->list
+         * to serialize with collect_signal() or with
+         * __exit_signal()->flush_sigqueue().
          */
         spin_lock_irqsave(lock, flags);
+        q->flags &= ~SIGQUEUE_PREALLOC;
+        /*
+         * If it is queued it will be freed when dequeued,
+         * like the "regular" sigqueue.
+         */
         if (!list_empty(&q->list))
-                list_del_init(&q->list);
+                q = NULL;
         spin_unlock_irqrestore(lock, flags);
 
-        q->flags &= ~SIGQUEUE_PREALLOC;
-        __sigqueue_free(q);
+        if (q)
+                __sigqueue_free(q);
 }
 
 int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 0101aeef7ed7..b7350bbfb076 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -62,8 +62,7 @@ static int stopmachine(void *cpu)
                  * help our sisters onto their CPUs. */
                 if (!prepared && !irqs_disabled)
                         yield();
-                else
-                        cpu_relax();
+                cpu_relax();
         }
 
         /* Ack: we are exiting. */
@@ -106,8 +105,10 @@ static int stop_machine(void)
         }
 
         /* Wait for them all to come to life. */
-        while (atomic_read(&stopmachine_thread_ack) != stopmachine_num_threads)
+        while (atomic_read(&stopmachine_thread_ack) != stopmachine_num_threads) {
                 yield();
+                cpu_relax();
+        }
 
         /* If some failed, kill them all. */
         if (ret < 0) {
diff --git a/kernel/sys.c b/kernel/sys.c
index 895d2d4c9493..14e97282eb6c 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1652,7 +1652,7 @@ 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 uninitialized_var(error);
+        long error = 0;
 
         if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
                 return error;
@@ -1701,9 +1701,7 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
                         error = PR_TIMING_STATISTICAL;
                         break;
                 case PR_SET_TIMING:
-                        if (arg2 == PR_TIMING_STATISTICAL)
-                                error = 0;
-                        else
+                        if (arg2 != PR_TIMING_STATISTICAL)
                                 error = -EINVAL;
                         break;