57 files changed, 9869 insertions, 2839 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 149e18ef1ab1..057472fbc272 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -75,7 +75,7 @@ obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
 obj-$(CONFIG_GCOV_KERNEL) += gcov/
 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
 obj-$(CONFIG_KPROBES) += kprobes.o
-obj-$(CONFIG_KGDB) += kgdb.o
+obj-$(CONFIG_KGDB) += debug/
 obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
diff --git a/kernel/acct.c b/kernel/acct.c
index e4c0e1fee9b0..385b88461c29 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -216,7 +216,6 @@ static int acct_on(char *name)
 {
         struct file *file;
         struct vfsmount *mnt;
-        int error;
         struct pid_namespace *ns;
         struct bsd_acct_struct *acct = NULL;
 
@@ -244,13 +243,6 @@ static int acct_on(char *name)
                 }
         }
 
-        error = security_acct(file);
-        if (error) {
-                kfree(acct);
-                filp_close(file, NULL);
-                return error;
-        }
-
         spin_lock(&acct_lock);
         if (ns->bacct == NULL) {
                 ns->bacct = acct;
@@ -281,7 +273,7 @@ static int acct_on(char *name)
  */
 SYSCALL_DEFINE1(acct, const char __user *, name)
 {
-        int error;
+        int error = 0;
 
         if (!capable(CAP_SYS_PACCT))
                 return -EPERM;
@@ -299,13 +291,11 @@ SYSCALL_DEFINE1(acct, const char __user *, name)
                 if (acct == NULL)
                         return 0;
 
-                error = security_acct(NULL);
-                if (!error) {
-                        spin_lock(&acct_lock);
-                        acct_file_reopen(acct, NULL, NULL);
-                        spin_unlock(&acct_lock);
-                }
+                spin_lock(&acct_lock);
+                acct_file_reopen(acct, NULL, NULL);
+                spin_unlock(&acct_lock);
         }
+
         return error;
 }
 
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e9ec642932ee..291775021b2e 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3615,7 +3615,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
  * @ss: the subsystem to load
  *
  * This function should be called in a modular subsystem's initcall. If the
- * subsytem is built as a module, it will be assigned a new subsys_id and set
+ * subsystem is built as a module, it will be assigned a new subsys_id and set
  * up for use. If the subsystem is built-in anyway, work is delegated to the
  * simpler cgroup_init_subsys.
  */
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index e5c0244962b0..ce71ed53e88f 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -89,10 +89,10 @@ struct cgroup_subsys freezer_subsys;
 
 /* Locks taken and their ordering
  * ------------------------------
- * css_set_lock
  * cgroup_mutex (AKA cgroup_lock)
- * task->alloc_lock (AKA task_lock)
  * freezer->lock
+ * css_set_lock
+ * task->alloc_lock (AKA task_lock)
  * task->sighand->siglock
  *
  * cgroup code forces css_set_lock to be taken before task->alloc_lock
@@ -100,33 +100,38 @@ struct cgroup_subsys freezer_subsys;
  * freezer_create(), freezer_destroy():
  * cgroup_mutex [ by cgroup core ]
  *
- * can_attach():
- * cgroup_mutex
+ * freezer_can_attach():
+ * cgroup_mutex (held by caller of can_attach)
  *
- * cgroup_frozen():
+ * cgroup_freezing_or_frozen():
  * task->alloc_lock (to get task's cgroup)
  *
  * freezer_fork() (preserving fork() performance means can't take cgroup_mutex):
- * task->alloc_lock (to get task's cgroup)
  * freezer->lock
  *  sighand->siglock (if the cgroup is freezing)
  *
  * freezer_read():
  * cgroup_mutex
  *  freezer->lock
+ *   write_lock css_set_lock (cgroup iterator start)
+ *    task->alloc_lock
  *   read_lock css_set_lock (cgroup iterator start)
  *
  * freezer_write() (freeze):
  * cgroup_mutex
  *  freezer->lock
+ *   write_lock css_set_lock (cgroup iterator start)
+ *    task->alloc_lock
  *   read_lock css_set_lock (cgroup iterator start)
- *    sighand->siglock
+ *    sighand->siglock (fake signal delivery inside freeze_task())
  *
  * freezer_write() (unfreeze):
  * cgroup_mutex
  *  freezer->lock
+ *   write_lock css_set_lock (cgroup iterator start)
+ *    task->alloc_lock
  *   read_lock css_set_lock (cgroup iterator start)
- *    task->alloc_lock (to prevent races with freeze_task())
+ *    task->alloc_lock (inside thaw_process(), prevents race with refrigerator())
  *     sighand->siglock
  */
 static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss,
diff --git a/kernel/compat.c b/kernel/compat.c
index 7f40e9275fd9..5adab05a3172 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -495,29 +495,26 @@ asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
 {
         int ret;
         cpumask_var_t mask;
-        unsigned long *k;
-        unsigned int min_length = cpumask_size();
-
-        if (nr_cpu_ids <= BITS_PER_COMPAT_LONG)
-                min_length = sizeof(compat_ulong_t);
 
-        if (len < min_length)
+        if ((len * BITS_PER_BYTE) < nr_cpu_ids)
+                return -EINVAL;
+        if (len & (sizeof(compat_ulong_t)-1))
                 return -EINVAL;
 
         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
                 return -ENOMEM;
 
         ret = sched_getaffinity(pid, mask);
-        if (ret < 0)
-                goto out;
+        if (ret == 0) {
+                size_t retlen = min_t(size_t, len, cpumask_size());
 
-        k = cpumask_bits(mask);
-        ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
-        if (ret == 0)
-                ret = min_length;
-
-out:
+                if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
+                        ret = -EFAULT;
+                else
+                        ret = retlen;
+        }
         free_cpumask_var(mask);
+
         return ret;
 }
 
diff --git a/kernel/cred.c b/kernel/cred.c
index 8f3672a58a1e..2c24870c55d1 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -522,8 +522,6 @@ int commit_creds(struct cred *new)
 #endif
         BUG_ON(atomic_read(&new->usage) < 1);
 
-        security_commit_creds(new, old);
-
         get_cred(new); /* we will require a ref for the subj creds too */
 
         /* dumpability changes */
diff --git a/kernel/debug/Makefile b/kernel/debug/Makefile
new file mode 100644
index 000000000000..a85edc339985
--- /dev/null
+++ b/kernel/debug/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the linux kernel debugger
+#
+
+obj-$(CONFIG_KGDB) += debug_core.o gdbstub.o
+obj-$(CONFIG_KGDB_KDB) += kdb/
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
new file mode 100644
index 000000000000..5cb7cd1de10c
--- /dev/null
+++ b/kernel/debug/debug_core.c
@@ -0,0 +1,983 @@
+/*
+ * Kernel Debug Core
+ *
+ * Maintainer: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ * Copyright (C) 2002-2004 Timesys Corporation
+ * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
+ * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
+ * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
+ * Copyright (C) 2005-2009 Wind River Systems, Inc.
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * Contributors at various stages not listed above:
+ *  Jason Wessel ( jason.wessel@windriver.com )
+ *  George Anzinger <george@mvista.com>
+ *  Anurekh Saxena (anurekh.saxena@timesys.com)
+ *  Lake Stevens Instrument Division (Glenn Engel)
+ *  Jim Kingdon, Cygnus Support.
+ *
+ * Original KGDB stub: David Grothe <dave@gcom.com>,
+ * Tigran Aivazian <tigran@sco.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+#include <linux/pid_namespace.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/console.h>
+#include <linux/threads.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ptrace.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/sysrq.h>
+#include <linux/init.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/pid.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+
+#include <asm/cacheflush.h>
+#include <asm/byteorder.h>
+#include <asm/atomic.h>
+#include <asm/system.h>
+
+#include "debug_core.h"
+
+static int kgdb_break_asap;
+
+struct debuggerinfo_struct kgdb_info[NR_CPUS];
+
+/**
+ * kgdb_connected - Is a host GDB connected to us?
+ */
+int                             kgdb_connected;
+EXPORT_SYMBOL_GPL(kgdb_connected);
+
+/* All the KGDB handlers are installed */
+int                     kgdb_io_module_registered;
+
+/* Guard for recursive entry */
+static int                      exception_level;
+
+struct kgdb_io          *dbg_io_ops;
+static DEFINE_SPINLOCK(kgdb_registration_lock);
+
+/* kgdb console driver is loaded */
+static int kgdb_con_registered;
+/* determine if kgdb console output should be used */
+static int kgdb_use_con;
+/* Flag for alternate operations for early debugging */
+bool dbg_is_early = true;
+/* Next cpu to become the master debug core */
+int dbg_switch_cpu;
+
+/* Use kdb or gdbserver mode */
+int dbg_kdb_mode = 1;
+
+static int __init opt_kgdb_con(char *str)
+{
+        kgdb_use_con = 1;
+        return 0;
+}
+
+early_param("kgdbcon", opt_kgdb_con);
+
+module_param(kgdb_use_con, int, 0644);
+
+/*
+ * Holds information about breakpoints in a kernel. These breakpoints are
+ * added and removed by gdb.
+ */
+static struct kgdb_bkpt         kgdb_break[KGDB_MAX_BREAKPOINTS] = {
+        [0 ... KGDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
+};
+
+/*
+ * The CPU# of the active CPU, or -1 if none:
+ */
+atomic_t                        kgdb_active = ATOMIC_INIT(-1);
+EXPORT_SYMBOL_GPL(kgdb_active);
+
+/*
+ * We use NR_CPUs not PERCPU, in case kgdb is used to debug early
+ * bootup code (which might not have percpu set up yet):
+ */
+static atomic_t                 passive_cpu_wait[NR_CPUS];
+static atomic_t                 cpu_in_kgdb[NR_CPUS];
+static atomic_t                 kgdb_break_tasklet_var;
+atomic_t                        kgdb_setting_breakpoint;
+
+struct task_struct              *kgdb_usethread;
+struct task_struct              *kgdb_contthread;
+
+int                             kgdb_single_step;
+static pid_t                    kgdb_sstep_pid;
+
+/* to keep track of the CPU which is doing the single stepping*/
+atomic_t                        kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);
+
+/*
+ * If you are debugging a problem where roundup (the collection of
+ * all other CPUs) is a problem [this should be extremely rare],
+ * then use the nokgdbroundup option to avoid roundup. In that case
+ * the other CPUs might interfere with your debugging context, so
+ * use this with care:
+ */
+static int kgdb_do_roundup = 1;
+
+static int __init opt_nokgdbroundup(char *str)
+{
+        kgdb_do_roundup = 0;
+
+        return 0;
+}
+
+early_param("nokgdbroundup", opt_nokgdbroundup);
+
+/*
+ * Finally, some KGDB code :-)
+ */
+
+/*
+ * Weak aliases for breakpoint management,
+ * can be overriden by architectures when needed:
+ */
+int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
+{
+        int err;
+
+        err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
+        if (err)
+                return err;
+
+        return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
+                                  BREAK_INSTR_SIZE);
+}
+
+int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
+{
+        return probe_kernel_write((char *)addr,
+                                  (char *)bundle, BREAK_INSTR_SIZE);
+}
+
+int __weak kgdb_validate_break_address(unsigned long addr)
+{
+        char tmp_variable[BREAK_INSTR_SIZE];
+        int err;
+        /* Validate setting the breakpoint and then removing it.  In the
+         * remove fails, the kernel needs to emit a bad message because we
+         * are deep trouble not being able to put things back the way we
+         * found them.
+         */
+        err = kgdb_arch_set_breakpoint(addr, tmp_variable);
+        if (err)
+                return err;
+        err = kgdb_arch_remove_breakpoint(addr, tmp_variable);
+        if (err)
+                printk(KERN_ERR "KGDB: Critical breakpoint error, kernel "
+                   "memory destroyed at: %lx", addr);
+        return err;
+}
+
+unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs)
+{
+        return instruction_pointer(regs);
+}
+
+int __weak kgdb_arch_init(void)
+{
+        return 0;
+}
+
+int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
+{
+        return 0;
+}
+
+/**
+ *      kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
+ *      @regs: Current &struct pt_regs.
+ *
+ *      This function will be called if the particular architecture must
+ *      disable hardware debugging while it is processing gdb packets or
+ *      handling exception.
+ */
+void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
+{
+}
+
+/*
+ * Some architectures need cache flushes when we set/clear a
+ * breakpoint:
+ */
+static void kgdb_flush_swbreak_addr(unsigned long addr)
+{
+        if (!CACHE_FLUSH_IS_SAFE)
+                return;
+
+        if (current->mm && current->mm->mmap_cache) {
+                flush_cache_range(current->mm->mmap_cache,
+                                  addr, addr + BREAK_INSTR_SIZE);
+        }
+        /* Force flush instruction cache if it was outside the mm */
+        flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
+}
+
+/*
+ * SW breakpoint management:
+ */
+int dbg_activate_sw_breakpoints(void)
+{
+        unsigned long addr;
+        int error;
+        int ret = 0;
+        int i;
+
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if (kgdb_break[i].state != BP_SET)
+                        continue;
+
+                addr = kgdb_break[i].bpt_addr;
+                error = kgdb_arch_set_breakpoint(addr,
+                                kgdb_break[i].saved_instr);
+                if (error) {
+                        ret = error;
+                        printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
+                        continue;
+                }
+
+                kgdb_flush_swbreak_addr(addr);
+                kgdb_break[i].state = BP_ACTIVE;
+        }
+        return ret;
+}
+
+int dbg_set_sw_break(unsigned long addr)
+{
+        int err = kgdb_validate_break_address(addr);
+        int breakno = -1;
+        int i;
+
+        if (err)
+                return err;
+
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if ((kgdb_break[i].state == BP_SET) &&
+                                        (kgdb_break[i].bpt_addr == addr))
+                        return -EEXIST;
+        }
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if (kgdb_break[i].state == BP_REMOVED &&
+                                        kgdb_break[i].bpt_addr == addr) {
+                        breakno = i;
+                        break;
+                }
+        }
+
+        if (breakno == -1) {
+                for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                        if (kgdb_break[i].state == BP_UNDEFINED) {
+                                breakno = i;
+                                break;
+                        }
+                }
+        }
+
+        if (breakno == -1)
+                return -E2BIG;
+
+        kgdb_break[breakno].state = BP_SET;
+        kgdb_break[breakno].type = BP_BREAKPOINT;
+        kgdb_break[breakno].bpt_addr = addr;
+
+        return 0;
+}
+
+int dbg_deactivate_sw_breakpoints(void)
+{
+        unsigned long addr;
+        int error;
+        int ret = 0;
+        int i;
+
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if (kgdb_break[i].state != BP_ACTIVE)
+                        continue;
+                addr = kgdb_break[i].bpt_addr;
+                error = kgdb_arch_remove_breakpoint(addr,
+                                        kgdb_break[i].saved_instr);
+                if (error) {
+                        printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
+                        ret = error;
+                }
+
+                kgdb_flush_swbreak_addr(addr);
+                kgdb_break[i].state = BP_SET;
+        }
+        return ret;
+}
+
+int dbg_remove_sw_break(unsigned long addr)
+{
+        int i;
+
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if ((kgdb_break[i].state == BP_SET) &&
+                                (kgdb_break[i].bpt_addr == addr)) {
+                        kgdb_break[i].state = BP_REMOVED;
+                        return 0;
+                }
+        }
+        return -ENOENT;
+}
+
+int kgdb_isremovedbreak(unsigned long addr)
+{
+        int i;
+
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if ((kgdb_break[i].state == BP_REMOVED) &&
+                                        (kgdb_break[i].bpt_addr == addr))
+                        return 1;
+        }
+        return 0;
+}
+
+int dbg_remove_all_break(void)
+{
+        unsigned long addr;
+        int error;
+        int i;
+
+        /* Clear memory breakpoints. */
+        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+                if (kgdb_break[i].state != BP_ACTIVE)
+                        goto setundefined;
+                addr = kgdb_break[i].bpt_addr;
+                error = kgdb_arch_remove_breakpoint(addr,
+                                kgdb_break[i].saved_instr);
+                if (error)
+                        printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
+                           addr);
+setundefined:
+                kgdb_break[i].state = BP_UNDEFINED;
+        }
+
+        /* Clear hardware breakpoints. */
+        if (arch_kgdb_ops.remove_all_hw_break)
+                arch_kgdb_ops.remove_all_hw_break();
+
+        return 0;
+}
+
+/*
+ * Return true if there is a valid kgdb I/O module.  Also if no
+ * debugger is attached a message can be printed to the console about
+ * waiting for the debugger to attach.
+ *
+ * The print_wait argument is only to be true when called from inside
+ * the core kgdb_handle_exception, because it will wait for the
+ * debugger to attach.
+ */
+static int kgdb_io_ready(int print_wait)
+{
+        if (!dbg_io_ops)
+                return 0;
+        if (kgdb_connected)
+                return 1;
+        if (atomic_read(&kgdb_setting_breakpoint))
+                return 1;
+        if (print_wait) {
+#ifdef CONFIG_KGDB_KDB
+                if (!dbg_kdb_mode)
+                        printk(KERN_CRIT "KGDB: waiting... or $3#33 for KDB\n");
+#else
+                printk(KERN_CRIT "KGDB: Waiting for remote debugger\n");
+#endif
+        }
+        return 1;
+}
+
+static int kgdb_reenter_check(struct kgdb_state *ks)
+{
+        unsigned long addr;
+
+        if (atomic_read(&kgdb_active) != raw_smp_processor_id())
+                return 0;
+
+        /* Panic on recursive debugger calls: */
+        exception_level++;
+        addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
+        dbg_deactivate_sw_breakpoints();
+
+        /*
+         * If the break point removed ok at the place exception
+         * occurred, try to recover and print a warning to the end
+         * user because the user planted a breakpoint in a place that
+         * KGDB needs in order to function.
+         */
+        if (dbg_remove_sw_break(addr) == 0) {
+                exception_level = 0;
+                kgdb_skipexception(ks->ex_vector, ks->linux_regs);
+                dbg_activate_sw_breakpoints();
+                printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n",
+                        addr);
+                WARN_ON_ONCE(1);
+
+                return 1;
+        }
+        dbg_remove_all_break();
+        kgdb_skipexception(ks->ex_vector, ks->linux_regs);
+
+        if (exception_level > 1) {
+                dump_stack();
+                panic("Recursive entry to debugger");
+        }
+
+        printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
+#ifdef CONFIG_KGDB_KDB
+        /* Allow kdb to debug itself one level */
+        return 0;
+#endif
+        dump_stack();
+        panic("Recursive entry to debugger");
+
+        return 1;
+}
+
+static void dbg_cpu_switch(int cpu, int next_cpu)
+{
+        /* Mark the cpu we are switching away from as a slave when it
+         * holds the kgdb_active token.  This must be done so that the
+         * that all the cpus wait in for the debug core will not enter
+         * again as the master. */
+        if (cpu == atomic_read(&kgdb_active)) {
+                kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
+                kgdb_info[cpu].exception_state &= ~DCPU_WANT_MASTER;
+        }
+        kgdb_info[next_cpu].exception_state |= DCPU_NEXT_MASTER;
+}
+
+static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
+{
+        unsigned long flags;
+        int sstep_tries = 100;
+        int error;
+        int i, cpu;
+        int trace_on = 0;
+acquirelock:
+        /*
+         * Interrupts will be restored by the 'trap return' code, except when
+         * single stepping.
+         */
+        local_irq_save(flags);
+
+        cpu = ks->cpu;
+        kgdb_info[cpu].debuggerinfo = regs;
+        kgdb_info[cpu].task = current;
+        kgdb_info[cpu].ret_state = 0;
+        kgdb_info[cpu].irq_depth = hardirq_count() >> HARDIRQ_SHIFT;
+        /*
+         * Make sure the above info reaches the primary CPU before
+         * our cpu_in_kgdb[] flag setting does:
+         */
+        atomic_inc(&cpu_in_kgdb[cpu]);
+
+        if (exception_level == 1)
+                goto cpu_master_loop;
+
+        /*
+         * CPU will loop if it is a slave or request to become a kgdb
+         * master cpu and acquire the kgdb_active lock:
+         */
+        while (1) {
+cpu_loop:
+                if (kgdb_info[cpu].exception_state & DCPU_NEXT_MASTER) {
+                        kgdb_info[cpu].exception_state &= ~DCPU_NEXT_MASTER;
+                        goto cpu_master_loop;
+                } else if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
+                        if (atomic_cmpxchg(&kgdb_active, -1, cpu) == cpu)
+                                break;
+                } else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
+                        if (!atomic_read(&passive_cpu_wait[cpu]))
+                                goto return_normal;
+                } else {
+return_normal:
+                        /* Return to normal operation by executing any
+                         * hw breakpoint fixup.
+                         */
+                        if (arch_kgdb_ops.correct_hw_break)
+                                arch_kgdb_ops.correct_hw_break();
+                        if (trace_on)
+                                tracing_on();
+                        atomic_dec(&cpu_in_kgdb[cpu]);
+                        touch_softlockup_watchdog_sync();
+                        clocksource_touch_watchdog();
+                        local_irq_restore(flags);
+                        return 0;
+                }
+                cpu_relax();
+        }
+
+        /*
+         * For single stepping, try to only enter on the processor
+         * that was single stepping.  To gaurd against a deadlock, the
+         * kernel will only try for the value of sstep_tries before
+         * giving up and continuing on.
+         */
+        if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
+            (kgdb_info[cpu].task &&
+             kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
+                atomic_set(&kgdb_active, -1);
+                touch_softlockup_watchdog_sync();
+                clocksource_touch_watchdog();
+                local_irq_restore(flags);
+
+                goto acquirelock;
+        }
+
+        if (!kgdb_io_ready(1)) {
+                kgdb_info[cpu].ret_state = 1;
+                goto kgdb_restore; /* No I/O connection, resume the system */
+        }
+
+        /*
+         * Don't enter if we have hit a removed breakpoint.
+         */
+        if (kgdb_skipexception(ks->ex_vector, ks->linux_regs))
+                goto kgdb_restore;
+
+        /* Call the I/O driver's pre_exception routine */
+        if (dbg_io_ops->pre_exception)
+                dbg_io_ops->pre_exception();
+
+        kgdb_disable_hw_debug(ks->linux_regs);
+
+        /*
+         * Get the passive CPU lock which will hold all the non-primary
+         * CPU in a spin state while the debugger is active
+         */
+        if (!kgdb_single_step) {
+                for (i = 0; i < NR_CPUS; i++)
+                        atomic_inc(&passive_cpu_wait[i]);
+        }
+
+#ifdef CONFIG_SMP
+        /* Signal the other CPUs to enter kgdb_wait() */
+        if ((!kgdb_single_step) && kgdb_do_roundup)
+                kgdb_roundup_cpus(flags);
+#endif
+
+        /*
+         * Wait for the other CPUs to be notified and be waiting for us:
+         */
+        for_each_online_cpu(i) {
+                while (kgdb_do_roundup && !atomic_read(&cpu_in_kgdb[i]))
+                        cpu_relax();
+        }
+
+        /*
+         * At this point the primary processor is completely
+         * in the debugger and all secondary CPUs are quiescent
+         */
+        dbg_deactivate_sw_breakpoints();
+        kgdb_single_step = 0;
+        kgdb_contthread = current;
+        exception_level = 0;
+        trace_on = tracing_is_on();
+        if (trace_on)
+                tracing_off();
+
+        while (1) {
+cpu_master_loop:
+                if (dbg_kdb_mode) {
+                        kgdb_connected = 1;
+                        error = kdb_stub(ks);
+                } else {
+                        error = gdb_serial_stub(ks);
+                }
+
+                if (error == DBG_PASS_EVENT) {
+                        dbg_kdb_mode = !dbg_kdb_mode;
+                        kgdb_connected = 0;
+                } else if (error == DBG_SWITCH_CPU_EVENT) {
+                        dbg_cpu_switch(cpu, dbg_switch_cpu);
+                        goto cpu_loop;
+                } else {
+                        kgdb_info[cpu].ret_state = error;
+                        break;
+                }
+        }
+
+        /* Call the I/O driver's post_exception routine */
+        if (dbg_io_ops->post_exception)
+                dbg_io_ops->post_exception();
+
+        atomic_dec(&cpu_in_kgdb[ks->cpu]);
+
+        if (!kgdb_single_step) {
+                for (i = NR_CPUS-1; i >= 0; i--)
+                        atomic_dec(&passive_cpu_wait[i]);
+                /*
+                 * Wait till all the CPUs have quit from the debugger,
+                 * but allow a CPU that hit an exception and is
+                 * waiting to become the master to remain in the debug
+                 * core.
+                 */
+                for_each_online_cpu(i) {
+                        while (kgdb_do_roundup &&
+                               atomic_read(&cpu_in_kgdb[i]) &&
+                               !(kgdb_info[i].exception_state &
+                                 DCPU_WANT_MASTER))
+                                cpu_relax();
+                }
+        }
+
+kgdb_restore:
+        if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
+                int sstep_cpu = atomic_read(&kgdb_cpu_doing_single_step);
+                if (kgdb_info[sstep_cpu].task)
+                        kgdb_sstep_pid = kgdb_info[sstep_cpu].task->pid;
+                else
+                        kgdb_sstep_pid = 0;
+        }
+        if (trace_on)
+                tracing_on();
+        /* Free kgdb_active */
+        atomic_set(&kgdb_active, -1);
+        touch_softlockup_watchdog_sync();
+        clocksource_touch_watchdog();
+        local_irq_restore(flags);
+
+        return kgdb_info[cpu].ret_state;
+}
+
+/*
+ * kgdb_handle_exception() - main entry point from a kernel exception
+ *
+ * Locking hierarchy:
+ *      interface locks, if any (begin_session)
+ *      kgdb lock (kgdb_active)
+ */
+int
+kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
+{
+        struct kgdb_state kgdb_var;
+        struct kgdb_state *ks = &kgdb_var;
+        int ret;
+
+        ks->cpu                 = raw_smp_processor_id();
+        ks->ex_vector           = evector;
+        ks->signo               = signo;
+        ks->err_code            = ecode;
+        ks->kgdb_usethreadid    = 0;
+        ks->linux_regs          = regs;
+
+        if (kgdb_reenter_check(ks))
+                return 0; /* Ouch, double exception ! */
+        kgdb_info[ks->cpu].exception_state |= DCPU_WANT_MASTER;
+        ret = kgdb_cpu_enter(ks, regs);
+        kgdb_info[ks->cpu].exception_state &= ~(DCPU_WANT_MASTER |
+                                                DCPU_IS_SLAVE);
+        return ret;
+}
+
+int kgdb_nmicallback(int cpu, void *regs)
+{
+#ifdef CONFIG_SMP
+        struct kgdb_state kgdb_var;
+        struct kgdb_state *ks = &kgdb_var;
+
+        memset(ks, 0, sizeof(struct kgdb_state));
+        ks->cpu                 = cpu;
+        ks->linux_regs          = regs;
+
+        if (!atomic_read(&cpu_in_kgdb[cpu]) &&
+            atomic_read(&kgdb_active) != -1 &&
+            atomic_read(&kgdb_active) != cpu) {
+                kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
+                kgdb_cpu_enter(ks, regs);
+                kgdb_info[cpu].exception_state &= ~DCPU_IS_SLAVE;
+                return 0;
+        }
+#endif
+        return 1;
+}
+
+static void kgdb_console_write(struct console *co, const char *s,
+   unsigned count)
+{
+        unsigned long flags;
+
+        /* If we're debugging, or KGDB has not connected, don't try
+         * and print. */
+        if (!kgdb_connected || atomic_read(&kgdb_active) != -1 || dbg_kdb_mode)
+                return;
+
+        local_irq_save(flags);
+        gdbstub_msg_write(s, count);
+        local_irq_restore(flags);
+}
+
+static struct console kgdbcons = {
+        .name           = "kgdb",
+        .write          = kgdb_console_write,
+        .flags          = CON_PRINTBUFFER | CON_ENABLED,
+        .index          = -1,
+};
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static void sysrq_handle_dbg(int key, struct tty_struct *tty)
+{
+        if (!dbg_io_ops) {
+                printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
+                return;
+        }
+        if (!kgdb_connected) {
+#ifdef CONFIG_KGDB_KDB
+                if (!dbg_kdb_mode)
+                        printk(KERN_CRIT "KGDB or $3#33 for KDB\n");
+#else
+                printk(KERN_CRIT "Entering KGDB\n");
+#endif
+        }
+
+        kgdb_breakpoint();
+}
+
+static struct sysrq_key_op sysrq_dbg_op = {
+        .handler        = sysrq_handle_dbg,
+        .help_msg       = "debug(G)",
+        .action_msg     = "DEBUG",
+};
+#endif
+
+static int kgdb_panic_event(struct notifier_block *self,
+                            unsigned long val,
+                            void *data)
+{
+        if (dbg_kdb_mode)
+                kdb_printf("PANIC: %s\n", (char *)data);
+        kgdb_breakpoint();
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block kgdb_panic_event_nb = {
+       .notifier_call   = kgdb_panic_event,
+       .priority        = INT_MAX,
+};
+
+void __weak kgdb_arch_late(void)
+{
+}
+
+void __init dbg_late_init(void)
+{
+        dbg_is_early = false;
+        if (kgdb_io_module_registered)
+                kgdb_arch_late();
+        kdb_init(KDB_INIT_FULL);
+}
+
+static void kgdb_register_callbacks(void)
+{
+        if (!kgdb_io_module_registered) {
+                kgdb_io_module_registered = 1;
+                kgdb_arch_init();
+                if (!dbg_is_early)
+                        kgdb_arch_late();
+                atomic_notifier_chain_register(&panic_notifier_list,
+                                               &kgdb_panic_event_nb);
+#ifdef CONFIG_MAGIC_SYSRQ
+                register_sysrq_key('g', &sysrq_dbg_op);
+#endif
+                if (kgdb_use_con && !kgdb_con_registered) {
+                        register_console(&kgdbcons);
+                        kgdb_con_registered = 1;
+                }
+        }
+}
+
+static void kgdb_unregister_callbacks(void)
+{
+        /*
+         * When this routine is called KGDB should unregister from the
+         * panic handler and clean up, making sure it is not handling any
+         * break exceptions at the time.
+         */
+        if (kgdb_io_module_registered) {
+                kgdb_io_module_registered = 0;
+                atomic_notifier_chain_unregister(&panic_notifier_list,
+                                               &kgdb_panic_event_nb);
+                kgdb_arch_exit();
+#ifdef CONFIG_MAGIC_SYSRQ
+                unregister_sysrq_key('g', &sysrq_dbg_op);
+#endif
+                if (kgdb_con_registered) {
+                        unregister_console(&kgdbcons);
+                        kgdb_con_registered = 0;
+                }
+        }
+}
+
+/*
+ * There are times a tasklet needs to be used vs a compiled in
+ * break point so as to cause an exception outside a kgdb I/O module,
+ * such as is the case with kgdboe, where calling a breakpoint in the
+ * I/O driver itself would be fatal.
+ */
+static void kgdb_tasklet_bpt(unsigned long ing)
+{
+        kgdb_breakpoint();
+        atomic_set(&kgdb_break_tasklet_var, 0);
+}
+
+static DECLARE_TASKLET(kgdb_tasklet_breakpoint, kgdb_tasklet_bpt, 0);
+
+void kgdb_schedule_breakpoint(void)
+{
+        if (atomic_read(&kgdb_break_tasklet_var) ||
+                atomic_read(&kgdb_active) != -1 ||
+                atomic_read(&kgdb_setting_breakpoint))
+                return;
+        atomic_inc(&kgdb_break_tasklet_var);
+        tasklet_schedule(&kgdb_tasklet_breakpoint);
+}
+EXPORT_SYMBOL_GPL(kgdb_schedule_breakpoint);
+
+static void kgdb_initial_breakpoint(void)
+{
+        kgdb_break_asap = 0;
+
+        printk(KERN_CRIT "kgdb: Waiting for connection from remote gdb...\n");
+        kgdb_breakpoint();
+}
+
+/**
+ *      kgdb_register_io_module - register KGDB IO module
+ *      @new_dbg_io_ops: the io ops vector
+ *
+ *      Register it with the KGDB core.
+ */
+int kgdb_register_io_module(struct kgdb_io *new_dbg_io_ops)
+{
+        int err;
+
+        spin_lock(&kgdb_registration_lock);
+
+        if (dbg_io_ops) {
+                spin_unlock(&kgdb_registration_lock);
+
+                printk(KERN_ERR "kgdb: Another I/O driver is already "
+                                "registered with KGDB.\n");
+                return -EBUSY;
+        }
+
+        if (new_dbg_io_ops->init) {
+                err = new_dbg_io_ops->init();
+                if (err) {
+                        spin_unlock(&kgdb_registration_lock);
+                        return err;
+                }
+        }
+
+        dbg_io_ops = new_dbg_io_ops;
+
+        spin_unlock(&kgdb_registration_lock);
+
+        printk(KERN_INFO "kgdb: Registered I/O driver %s.\n",
+               new_dbg_io_ops->name);
+
+        /* Arm KGDB now. */
+        kgdb_register_callbacks();
+
+        if (kgdb_break_asap)
+                kgdb_initial_breakpoint();
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(kgdb_register_io_module);
+
+/**
+ *      kkgdb_unregister_io_module - unregister KGDB IO module
+ *      @old_dbg_io_ops: the io ops vector
+ *
+ *      Unregister it with the KGDB core.
+ */
+void kgdb_unregister_io_module(struct kgdb_io *old_dbg_io_ops)
+{
+        BUG_ON(kgdb_connected);
+
+        /*
+         * KGDB is no longer able to communicate out, so
+         * unregister our callbacks and reset state.
+         */
+        kgdb_unregister_callbacks();
+
+        spin_lock(&kgdb_registration_lock);
+
+        WARN_ON_ONCE(dbg_io_ops != old_dbg_io_ops);
+        dbg_io_ops = NULL;
+
+        spin_unlock(&kgdb_registration_lock);
+
+        printk(KERN_INFO
+                "kgdb: Unregistered I/O driver %s, debugger disabled.\n",
+                old_dbg_io_ops->name);
+}
+EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
+
+int dbg_io_get_char(void)
+{
+        int ret = dbg_io_ops->read_char();
+        if (ret == NO_POLL_CHAR)
+                return -1;
+        if (!dbg_kdb_mode)
+                return ret;
+        if (ret == 127)
+                return 8;
+        return ret;
+}
+
+/**
+ * kgdb_breakpoint - generate breakpoint exception
+ *
+ * This function will generate a breakpoint exception.  It is used at the
+ * beginning of a program to sync up with a debugger and can be used
+ * otherwise as a quick means to stop program execution and "break" into
+ * the debugger.
+ */
+void kgdb_breakpoint(void)
+{
+        atomic_inc(&kgdb_setting_breakpoint);
+        wmb(); /* Sync point before breakpoint */
+        arch_kgdb_breakpoint();
+        wmb(); /* Sync point after breakpoint */
+        atomic_dec(&kgdb_setting_breakpoint);
+}
+EXPORT_SYMBOL_GPL(kgdb_breakpoint);
+
+static int __init opt_kgdb_wait(char *str)
+{
+        kgdb_break_asap = 1;
+
+        kdb_init(KDB_INIT_EARLY);
+        if (kgdb_io_module_registered)
+                kgdb_initial_breakpoint();
+
+        return 0;
+}
+
+early_param("kgdbwait", opt_kgdb_wait);
diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h
new file mode 100644
index 000000000000..c5d753d80f67
--- /dev/null
+++ b/kernel/debug/debug_core.h
@@ -0,0 +1,81 @@
+/*
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _DEBUG_CORE_H_
+#define _DEBUG_CORE_H_
+/*
+ * These are the private implementation headers between the kernel
+ * debugger core and the debugger front end code.
+ */
+
+/* kernel debug core data structures */
+struct kgdb_state {
+        int                     ex_vector;
+        int                     signo;
+        int                     err_code;
+        int                     cpu;
+        int                     pass_exception;
+        unsigned long           thr_query;
+        unsigned long           threadid;
+        long                    kgdb_usethreadid;
+        struct pt_regs          *linux_regs;
+};
+
+/* Exception state values */
+#define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
+#define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
+#define DCPU_IS_SLAVE    0x4 /* Slave cpu enter exception */
+#define DCPU_SSTEP       0x8 /* CPU is single stepping */
+
+struct debuggerinfo_struct {
+        void                    *debuggerinfo;
+        struct task_struct      *task;
+        int                     exception_state;
+        int                     ret_state;
+        int                     irq_depth;
+};
+
+extern struct debuggerinfo_struct kgdb_info[];
+
+/* kernel debug core break point routines */
+extern int dbg_remove_all_break(void);
+extern int dbg_set_sw_break(unsigned long addr);
+extern int dbg_remove_sw_break(unsigned long addr);
+extern int dbg_activate_sw_breakpoints(void);
+extern int dbg_deactivate_sw_breakpoints(void);
+
+/* polled character access to i/o module */
+extern int dbg_io_get_char(void);
+
+/* stub return value for switching between the gdbstub and kdb */
+#define DBG_PASS_EVENT -12345
+/* Switch from one cpu to another */
+#define DBG_SWITCH_CPU_EVENT -123456
+extern int dbg_switch_cpu;
+
+/* gdbstub interface functions */
+extern int gdb_serial_stub(struct kgdb_state *ks);
+extern void gdbstub_msg_write(const char *s, int len);
+
+/* gdbstub functions used for kdb <-> gdbstub transition */
+extern int gdbstub_state(struct kgdb_state *ks, char *cmd);
+extern int dbg_kdb_mode;
+
+#ifdef CONFIG_KGDB_KDB
+extern int kdb_stub(struct kgdb_state *ks);
+extern int kdb_parse(const char *cmdstr);
+#else /* ! CONFIG_KGDB_KDB */
+static inline int kdb_stub(struct kgdb_state *ks)
+{
+        return DBG_PASS_EVENT;
+}
+#endif /* CONFIG_KGDB_KDB */
+
+#endif /* _DEBUG_CORE_H_ */
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
new file mode 100644
index 000000000000..4b17b3269525
--- /dev/null
+++ b/kernel/debug/gdbstub.c
@@ -0,0 +1,1017 @@
+/*
+ * Kernel Debug Core
+ *
+ * Maintainer: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ * Copyright (C) 2002-2004 Timesys Corporation
+ * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
+ * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
+ * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
+ * Copyright (C) 2005-2009 Wind River Systems, Inc.
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * Contributors at various stages not listed above:
+ *  Jason Wessel ( jason.wessel@windriver.com )
+ *  George Anzinger <george@mvista.com>
+ *  Anurekh Saxena (anurekh.saxena@timesys.com)
+ *  Lake Stevens Instrument Division (Glenn Engel)
+ *  Jim Kingdon, Cygnus Support.
+ *
+ * Original KGDB stub: David Grothe <dave@gcom.com>,
+ * Tigran Aivazian <tigran@sco.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/reboot.h>
+#include <linux/uaccess.h>
+#include <asm/cacheflush.h>
+#include <asm/unaligned.h>
+#include "debug_core.h"
+
+#define KGDB_MAX_THREAD_QUERY 17
+
+/* Our I/O buffers. */
+static char                     remcom_in_buffer[BUFMAX];
+static char                     remcom_out_buffer[BUFMAX];
+
+/* Storage for the registers, in GDB format. */
+static unsigned long            gdb_regs[(NUMREGBYTES +
+                                        sizeof(unsigned long) - 1) /
+                                        sizeof(unsigned long)];
+
+/*
+ * GDB remote protocol parser:
+ */
+
+static int hex(char ch)
+{
+        if ((ch >= 'a') && (ch <= 'f'))
+                return ch - 'a' + 10;
+        if ((ch >= '0') && (ch <= '9'))
+                return ch - '0';
+        if ((ch >= 'A') && (ch <= 'F'))
+                return ch - 'A' + 10;
+        return -1;
+}
+
+#ifdef CONFIG_KGDB_KDB
+static int gdbstub_read_wait(void)
+{
+        int ret = -1;
+        int i;
+
+        /* poll any additional I/O interfaces that are defined */
+        while (ret < 0)
+                for (i = 0; kdb_poll_funcs[i] != NULL; i++) {
+                        ret = kdb_poll_funcs[i]();
+                        if (ret > 0)
+                                break;
+                }
+        return ret;
+}
+#else
+static int gdbstub_read_wait(void)
+{
+        int ret = dbg_io_ops->read_char();
+        while (ret == NO_POLL_CHAR)
+                ret = dbg_io_ops->read_char();
+        return ret;
+}
+#endif
+/* scan for the sequence $<data>#<checksum> */
+static void get_packet(char *buffer)
+{
+        unsigned char checksum;
+        unsigned char xmitcsum;
+        int count;
+        char ch;
+
+        do {
+                /*
+                 * Spin and wait around for the start character, ignore all
+                 * other characters:
+                 */
+                while ((ch = (gdbstub_read_wait())) != '$')
+                        /* nothing */;
+
+                kgdb_connected = 1;
+                checksum = 0;
+                xmitcsum = -1;
+
+                count = 0;
+
+                /*
+                 * now, read until a # or end of buffer is found:
+                 */
+                while (count < (BUFMAX - 1)) {
+                        ch = gdbstub_read_wait();
+                        if (ch == '#')
+                                break;
+                        checksum = checksum + ch;
+                        buffer[count] = ch;
+                        count = count + 1;
+                }
+                buffer[count] = 0;
+
+                if (ch == '#') {
+                        xmitcsum = hex(gdbstub_read_wait()) << 4;
+                        xmitcsum += hex(gdbstub_read_wait());
+
+                        if (checksum != xmitcsum)
+                                /* failed checksum */
+                                dbg_io_ops->write_char('-');
+                        else
+                                /* successful transfer */
+                                dbg_io_ops->write_char('+');
+                        if (dbg_io_ops->flush)
+                                dbg_io_ops->flush();
+                }
+        } while (checksum != xmitcsum);
+}
+
+/*
+ * Send the packet in buffer.
+ * Check for gdb connection if asked for.
+ */
+static void put_packet(char *buffer)
+{
+        unsigned char checksum;
+        int count;
+        char ch;
+
+        /*
+         * $<packet info>#<checksum>.
+         */
+        while (1) {
+                dbg_io_ops->write_char('$');
+                checksum = 0;
+                count = 0;
+
+                while ((ch = buffer[count])) {
+                        dbg_io_ops->write_char(ch);
+                        checksum += ch;
+                        count++;
+                }
+
+                dbg_io_ops->write_char('#');
+                dbg_io_ops->write_char(hex_asc_hi(checksum));
+                dbg_io_ops->write_char(hex_asc_lo(checksum));
+                if (dbg_io_ops->flush)
+                        dbg_io_ops->flush();
+
+                /* Now see what we get in reply. */
+                ch = gdbstub_read_wait();
+
+                if (ch == 3)
+                        ch = gdbstub_read_wait();
+
+                /* If we get an ACK, we are done. */
+                if (ch == '+')
+                        return;
+
+                /*
+                 * If we get the start of another packet, this means
+                 * that GDB is attempting to reconnect.  We will NAK
+                 * the packet being sent, and stop trying to send this
+                 * packet.
+                 */
+                if (ch == '$') {
+                        dbg_io_ops->write_char('-');
+                        if (dbg_io_ops->flush)
+                                dbg_io_ops->flush();
+                        return;
+                }
+        }
+}
+
+static char gdbmsgbuf[BUFMAX + 1];
+
+void gdbstub_msg_write(const char *s, int len)
+{
+        char *bufptr;
+        int wcount;
+        int i;
+
+        if (len == 0)
+                len = strlen(s);
+
+        /* 'O'utput */
+        gdbmsgbuf[0] = 'O';
+
+        /* Fill and send buffers... */
+        while (len > 0) {
+                bufptr = gdbmsgbuf + 1;
+
+                /* Calculate how many this time */
+                if ((len << 1) > (BUFMAX - 2))
+                        wcount = (BUFMAX - 2) >> 1;
+                else
+                        wcount = len;
+
+                /* Pack in hex chars */
+                for (i = 0; i < wcount; i++)
+                        bufptr = pack_hex_byte(bufptr, s[i]);
+                *bufptr = '\0';
+
+                /* Move up */
+                s += wcount;
+                len -= wcount;
+
+                /* Write packet */
+                put_packet(gdbmsgbuf);
+        }
+}
+
+/*
+ * Convert the memory pointed to by mem into hex, placing result in
+ * buf.  Return a pointer to the last char put in buf (null). May
+ * return an error.
+ */
+int kgdb_mem2hex(char *mem, char *buf, int count)
+{
+        char *tmp;
+        int err;
+
+        /*
+         * We use the upper half of buf as an intermediate buffer for the
+         * raw memory copy.  Hex conversion will work against this one.
+         */
+        tmp = buf + count;
+
+        err = probe_kernel_read(tmp, mem, count);
+        if (!err) {
+                while (count > 0) {
+                        buf = pack_hex_byte(buf, *tmp);
+                        tmp++;
+                        count--;
+                }
+
+                *buf = 0;
+        }
+
+        return err;
+}
+
+/*
+ * Convert the hex array pointed to by buf into binary to be placed in
+ * mem.  Return a pointer to the character AFTER the last byte
+ * written.  May return an error.
+ */
+int kgdb_hex2mem(char *buf, char *mem, int count)
+{
+        char *tmp_raw;
+        char *tmp_hex;
+
+        /*
+         * We use the upper half of buf as an intermediate buffer for the
+         * raw memory that is converted from hex.
+         */
+        tmp_raw = buf + count * 2;
+
+        tmp_hex = tmp_raw - 1;
+        while (tmp_hex >= buf) {
+                tmp_raw--;
+                *tmp_raw = hex(*tmp_hex--);
+                *tmp_raw |= hex(*tmp_hex--) << 4;
+        }
+
+        return probe_kernel_write(mem, tmp_raw, count);
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int kgdb_hex2long(char **ptr, unsigned long *long_val)
+{
+        int hex_val;
+        int num = 0;
+        int negate = 0;
+
+        *long_val = 0;
+
+        if (**ptr == '-') {
+                negate = 1;
+                (*ptr)++;
+        }
+        while (**ptr) {
+                hex_val = hex(**ptr);
+                if (hex_val < 0)
+                        break;
+
+                *long_val = (*long_val << 4) | hex_val;
+                num++;
+                (*ptr)++;
+        }
+
+        if (negate)
+                *long_val = -*long_val;
+
+        return num;
+}
+
+/*
+ * Copy the binary array pointed to by buf into mem.  Fix $, #, and
+ * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
+ * The input buf is overwitten with the result to write to mem.
+ */
+static int kgdb_ebin2mem(char *buf, char *mem, int count)
+{
+        int size = 0;
+        char *c = buf;
+
+        while (count-- > 0) {
+                c[size] = *buf++;
+                if (c[size] == 0x7d)
+                        c[size] = *buf++ ^ 0x20;
+                size++;
+        }
+
+        return probe_kernel_write(mem, c, size);
+}
+
+/* Write memory due to an 'M' or 'X' packet. */
+static int write_mem_msg(int binary)
+{
+        char *ptr = &remcom_in_buffer[1];
+        unsigned long addr;
+        unsigned long length;
+        int err;
+
+        if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
+            kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
+                if (binary)
+                        err = kgdb_ebin2mem(ptr, (char *)addr, length);
+                else
+                        err = kgdb_hex2mem(ptr, (char *)addr, length);
+                if (err)
+                        return err;
+                if (CACHE_FLUSH_IS_SAFE)
+                        flush_icache_range(addr, addr + length);
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
+static void error_packet(char *pkt, int error)
+{
+        error = -error;
+        pkt[0] = 'E';
+        pkt[1] = hex_asc[(error / 10)];
+        pkt[2] = hex_asc[(error % 10)];
+        pkt[3] = '\0';
+}
+
+/*
+ * Thread ID accessors. We represent a flat TID space to GDB, where
+ * the per CPU idle threads (which under Linux all have PID 0) are
+ * remapped to negative TIDs.
+ */
+
+#define BUF_THREAD_ID_SIZE      16
+
+static char *pack_threadid(char *pkt, unsigned char *id)
+{
+        char *limit;
+
+        limit = pkt + BUF_THREAD_ID_SIZE;
+        while (pkt < limit)
+                pkt = pack_hex_byte(pkt, *id++);
+
+        return pkt;
+}
+
+static void int_to_threadref(unsigned char *id, int value)
+{
+        unsigned char *scan;
+        int i = 4;
+
+        scan = (unsigned char *)id;
+        while (i--)
+                *scan++ = 0;
+        put_unaligned_be32(value, scan);
+}
+
+static struct task_struct *getthread(struct pt_regs *regs, int tid)
+{
+        /*
+         * Non-positive TIDs are remapped to the cpu shadow information
+         */
+        if (tid == 0 || tid == -1)
+                tid = -atomic_read(&kgdb_active) - 2;
+        if (tid < -1 && tid > -NR_CPUS - 2) {
+                if (kgdb_info[-tid - 2].task)
+                        return kgdb_info[-tid - 2].task;
+                else
+                        return idle_task(-tid - 2);
+        }
+        if (tid <= 0) {
+                printk(KERN_ERR "KGDB: Internal thread select error\n");
+                dump_stack();
+                return NULL;
+        }
+
+        /*
+         * find_task_by_pid_ns() does not take the tasklist lock anymore
+         * but is nicely RCU locked - hence is a pretty resilient
+         * thing to use:
+         */
+        return find_task_by_pid_ns(tid, &init_pid_ns);
+}
+
+
+/*
+ * Remap normal tasks to their real PID,
+ * CPU shadow threads are mapped to -CPU - 2
+ */
+static inline int shadow_pid(int realpid)
+{
+        if (realpid)
+                return realpid;
+
+        return -raw_smp_processor_id() - 2;
+}
+
+/*
+ * All the functions that start with gdb_cmd are the various
+ * operations to implement the handlers for the gdbserial protocol
+ * where KGDB is communicating with an external debugger
+ */
+
+/* Handle the '?' status packets */
+static void gdb_cmd_status(struct kgdb_state *ks)
+{
+        /*
+         * We know that this packet is only sent
+         * during initial connect.  So to be safe,
+         * we clear out our breakpoints now in case
+         * GDB is reconnecting.
+         */
+        dbg_remove_all_break();
+
+        remcom_out_buffer[0] = 'S';
+        pack_hex_byte(&remcom_out_buffer[1], ks->signo);
+}
+
+/* Handle the 'g' get registers request */
+static void gdb_cmd_getregs(struct kgdb_state *ks)
+{
+        struct task_struct *thread;
+        void *local_debuggerinfo;
+        int i;
+
+        thread = kgdb_usethread;
+        if (!thread) {
+                thread = kgdb_info[ks->cpu].task;
+                local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
+        } else {
+                local_debuggerinfo = NULL;
+                for_each_online_cpu(i) {
+                        /*
+                         * Try to find the task on some other
+                         * or possibly this node if we do not
+                         * find the matching task then we try
+                         * to approximate the results.
+                         */
+                        if (thread == kgdb_info[i].task)
+                                local_debuggerinfo = kgdb_info[i].debuggerinfo;
+                }
+        }
+
+        /*
+         * All threads that don't have debuggerinfo should be
+         * in schedule() sleeping, since all other CPUs
+         * are in kgdb_wait, and thus have debuggerinfo.
+         */
+        if (local_debuggerinfo) {
+                pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
+        } else {
+                /*
+                 * Pull stuff saved during switch_to; nothing
+                 * else is accessible (or even particularly
+                 * relevant).
+                 *
+                 * This should be enough for a stack trace.
+                 */
+                sleeping_thread_to_gdb_regs(gdb_regs, thread);
+        }
+        kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
+}
+
+/* Handle the 'G' set registers request */
+static void gdb_cmd_setregs(struct kgdb_state *ks)
+{
+        kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
+
+        if (kgdb_usethread && kgdb_usethread != current) {
+                error_packet(remcom_out_buffer, -EINVAL);
+        } else {
+                gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
+                strcpy(remcom_out_buffer, "OK");
+        }
+}
+
+/* Handle the 'm' memory read bytes */
+static void gdb_cmd_memread(struct kgdb_state *ks)
+{
+        char *ptr = &remcom_in_buffer[1];
+        unsigned long length;
+        unsigned long addr;
+        int err;
+
+        if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
+                                        kgdb_hex2long(&ptr, &length) > 0) {
+                err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
+                if (err)
+                        error_packet(remcom_out_buffer, err);
+        } else {
+                error_packet(remcom_out_buffer, -EINVAL);
+        }
+}
+
+/* Handle the 'M' memory write bytes */
+static void gdb_cmd_memwrite(struct kgdb_state *ks)
+{
+        int err = write_mem_msg(0);
+
+        if (err)
+                error_packet(remcom_out_buffer, err);
+        else
+                strcpy(remcom_out_buffer, "OK");
+}
+
+/* Handle the 'X' memory binary write bytes */
+static void gdb_cmd_binwrite(struct kgdb_state *ks)
+{
+        int err = write_mem_msg(1);
+
+        if (err)
+                error_packet(remcom_out_buffer, err);
+        else
+                strcpy(remcom_out_buffer, "OK");
+}
+
+/* Handle the 'D' or 'k', detach or kill packets */
+static void gdb_cmd_detachkill(struct kgdb_state *ks)
+{
+        int error;
+
+        /* The detach case */
+        if (remcom_in_buffer[0] == 'D') {
+                error = dbg_remove_all_break();
+                if (error < 0) {
+                        error_packet(remcom_out_buffer, error);
+                } else {
+                        strcpy(remcom_out_buffer, "OK");
+                        kgdb_connected = 0;
+                }
+                put_packet(remcom_out_buffer);
+        } else {
+                /*
+                 * Assume the kill case, with no exit code checking,
+                 * trying to force detach the debugger:
+                 */
+                dbg_remove_all_break();
+                kgdb_connected = 0;
+        }
+}
+
+/* Handle the 'R' reboot packets */
+static int gdb_cmd_reboot(struct kgdb_state *ks)
+{
+        /* For now, only honor R0 */
+        if (strcmp(remcom_in_buffer, "R0") == 0) {
+                printk(KERN_CRIT "Executing emergency reboot\n");
+                strcpy(remcom_out_buffer, "OK");
+                put_packet(remcom_out_buffer);
+
+                /*
+                 * Execution should not return from
+                 * machine_emergency_restart()
+                 */
+                machine_emergency_restart();
+                kgdb_connected = 0;
+
+                return 1;
+        }
+        return 0;
+}
+
+/* Handle the 'q' query packets */
+static void gdb_cmd_query(struct kgdb_state *ks)
+{
+        struct task_struct *g;
+        struct task_struct *p;
+        unsigned char thref[8];
+        char *ptr;
+        int i;
+        int cpu;
+        int finished = 0;
+
+        switch (remcom_in_buffer[1]) {
+        case 's':
+        case 'f':
+                if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
+                        error_packet(remcom_out_buffer, -EINVAL);
+                        break;
+                }
+
+                i = 0;
+                remcom_out_buffer[0] = 'm';
+                ptr = remcom_out_buffer + 1;
+                if (remcom_in_buffer[1] == 'f') {
+                        /* Each cpu is a shadow thread */
+                        for_each_online_cpu(cpu) {
+                                ks->thr_query = 0;
+                                int_to_threadref(thref, -cpu - 2);
+                                pack_threadid(ptr, thref);
+                                ptr += BUF_THREAD_ID_SIZE;
+                                *(ptr++) = ',';
+                                i++;
+                        }
+                }
+
+                do_each_thread(g, p) {
+                        if (i >= ks->thr_query && !finished) {
+                                int_to_threadref(thref, p->pid);
+                                pack_threadid(ptr, thref);
+                                ptr += BUF_THREAD_ID_SIZE;
+                                *(ptr++) = ',';
+                                ks->thr_query++;
+                                if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
+                                        finished = 1;
+                        }
+                        i++;
+                } while_each_thread(g, p);
+
+                *(--ptr) = '\0';
+                break;
+
+        case 'C':
+                /* Current thread id */
+                strcpy(remcom_out_buffer, "QC");
+                ks->threadid = shadow_pid(current->pid);
+                int_to_threadref(thref, ks->threadid);
+                pack_threadid(remcom_out_buffer + 2, thref);
+                break;
+        case 'T':
+                if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
+                        error_packet(remcom_out_buffer, -EINVAL);
+                        break;
+                }
+                ks->threadid = 0;
+                ptr = remcom_in_buffer + 17;
+                kgdb_hex2long(&ptr, &ks->threadid);
+                if (!getthread(ks->linux_regs, ks->threadid)) {
+                        error_packet(remcom_out_buffer, -EINVAL);
+                        break;
+                }
+                if ((int)ks->threadid > 0) {
+                        kgdb_mem2hex(getthread(ks->linux_regs,
+                                        ks->threadid)->comm,
+                                        remcom_out_buffer, 16);
+                } else {
+                        static char tmpstr[23 + BUF_THREAD_ID_SIZE];
+
+                        sprintf(tmpstr, "shadowCPU%d",
+                                        (int)(-ks->threadid - 2));
+                        kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
+                }
+                break;
+#ifdef CONFIG_KGDB_KDB
+        case 'R':
+                if (strncmp(remcom_in_buffer, "qRcmd,", 6) == 0) {
+                        int len = strlen(remcom_in_buffer + 6);
+
+                        if ((len % 2) != 0) {
+                                strcpy(remcom_out_buffer, "E01");
+                                break;
+                        }
+                        kgdb_hex2mem(remcom_in_buffer + 6,
+                                     remcom_out_buffer, len);
+                        len = len / 2;
+                        remcom_out_buffer[len++] = 0;
+
+                        kdb_parse(remcom_out_buffer);
+                        strcpy(remcom_out_buffer, "OK");
+                }
+                break;
+#endif
+        }
+}
+
+/* Handle the 'H' task query packets */
+static void gdb_cmd_task(struct kgdb_state *ks)
+{
+        struct task_struct *thread;
+        char *ptr;
+
+        switch (remcom_in_buffer[1]) {
+        case 'g':
+                ptr = &remcom_in_buffer[2];
+                kgdb_hex2long(&ptr, &ks->threadid);
+                thread = getthread(ks->linux_regs, ks->threadid);
+                if (!thread && ks->threadid > 0) {
+                        error_packet(remcom_out_buffer, -EINVAL);
+                        break;
+                }
+                kgdb_usethread = thread;
+                ks->kgdb_usethreadid = ks->threadid;
+                strcpy(remcom_out_buffer, "OK");
+                break;
+        case 'c':
+                ptr = &remcom_in_buffer[2];
+                kgdb_hex2long(&ptr, &ks->threadid);
+                if (!ks->threadid) {
+                        kgdb_contthread = NULL;
+                } else {
+                        thread = getthread(ks->linux_regs, ks->threadid);
+                        if (!thread && ks->threadid > 0) {
+                                error_packet(remcom_out_buffer, -EINVAL);
+                                break;
+                        }
+                        kgdb_contthread = thread;
+                }
+                strcpy(remcom_out_buffer, "OK");
+                break;
+        }
+}
+
+/* Handle the 'T' thread query packets */
+static void gdb_cmd_thread(struct kgdb_state *ks)
+{
+        char *ptr = &remcom_in_buffer[1];
+        struct task_struct *thread;
+
+        kgdb_hex2long(&ptr, &ks->threadid);
+        thread = getthread(ks->linux_regs, ks->threadid);
+        if (thread)
+                strcpy(remcom_out_buffer, "OK");
+        else
+                error_packet(remcom_out_buffer, -EINVAL);
+}
+
+/* Handle the 'z' or 'Z' breakpoint remove or set packets */
+static void gdb_cmd_break(struct kgdb_state *ks)
+{
+        /*
+         * Since GDB-5.3, it's been drafted that '0' is a software
+         * breakpoint, '1' is a hardware breakpoint, so let's do that.
+         */
+        char *bpt_type = &remcom_in_buffer[1];
+        char *ptr = &remcom_in_buffer[2];
+        unsigned long addr;
+        unsigned long length;
+        int error = 0;
+
+        if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
+                /* Unsupported */
+                if (*bpt_type > '4')
+                        return;
+        } else {
+                if (*bpt_type != '0' && *bpt_type != '1')
+                        /* Unsupported. */
+                        return;
+        }
+
+        /*
+         * Test if this is a hardware breakpoint, and
+         * if we support it:
+         */
+        if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
+                /* Unsupported. */
+                return;
+
+        if (*(ptr++) != ',') {
+                error_packet(remcom_out_buffer, -EINVAL);
+                return;
+        }
+        if (!kgdb_hex2long(&ptr, &addr)) {
+                error_packet(remcom_out_buffer, -EINVAL);
+                return;
+        }
+        if (*(ptr++) != ',' ||
+                !kgdb_hex2long(&ptr, &length)) {
+                error_packet(remcom_out_buffer, -EINVAL);
+                return;
+        }
+
+        if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
+                error = dbg_set_sw_break(addr);
+        else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
+                error = dbg_remove_sw_break(addr);
+        else if (remcom_in_buffer[0] == 'Z')
+                error = arch_kgdb_ops.set_hw_breakpoint(addr,
+                        (int)length, *bpt_type - '0');
+        else if (remcom_in_buffer[0] == 'z')
+                error = arch_kgdb_ops.remove_hw_breakpoint(addr,
+                        (int) length, *bpt_type - '0');
+
+        if (error == 0)
+                strcpy(remcom_out_buffer, "OK");
+        else
+                error_packet(remcom_out_buffer, error);
+}
+
+/* Handle the 'C' signal / exception passing packets */
+static int gdb_cmd_exception_pass(struct kgdb_state *ks)
+{
+        /* C09 == pass exception
+         * C15 == detach kgdb, pass exception
+         */
+        if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
+
+                ks->pass_exception = 1;
+                remcom_in_buffer[0] = 'c';
+
+        } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
+
+                ks->pass_exception = 1;
+                remcom_in_buffer[0] = 'D';
+                dbg_remove_all_break();
+                kgdb_connected = 0;
+                return 1;
+
+        } else {
+                gdbstub_msg_write("KGDB only knows signal 9 (pass)"
+                        " and 15 (pass and disconnect)\n"
+                        "Executing a continue without signal passing\n", 0);
+                remcom_in_buffer[0] = 'c';
+        }
+
+        /* Indicate fall through */
+        return -1;
+}
+
+/*
+ * This function performs all gdbserial command procesing
+ */
+int gdb_serial_stub(struct kgdb_state *ks)
+{
+        int error = 0;
+        int tmp;
+
+        /* Clear the out buffer. */
+        memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+
+        if (kgdb_connected) {
+                unsigned char thref[8];
+                char *ptr;
+
+                /* Reply to host that an exception has occurred */
+                ptr = remcom_out_buffer;
+                *ptr++ = 'T';
+                ptr = pack_hex_byte(ptr, ks->signo);
+                ptr += strlen(strcpy(ptr, "thread:"));
+                int_to_threadref(thref, shadow_pid(current->pid));
+                ptr = pack_threadid(ptr, thref);
+                *ptr++ = ';';
+                put_packet(remcom_out_buffer);
+        }
+
+        kgdb_usethread = kgdb_info[ks->cpu].task;
+        ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
+        ks->pass_exception = 0;
+
+        while (1) {
+                error = 0;
+
+                /* Clear the out buffer. */
+                memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+
+                get_packet(remcom_in_buffer);
+
+                switch (remcom_in_buffer[0]) {
+                case '?': /* gdbserial status */
+                        gdb_cmd_status(ks);
+                        break;
+                case 'g': /* return the value of the CPU registers */
+                        gdb_cmd_getregs(ks);
+                        break;
+                case 'G': /* set the value of the CPU registers - return OK */
+                        gdb_cmd_setregs(ks);
+                        break;
+                case 'm': /* mAA..AA,LLLL  Read LLLL bytes at address AA..AA */
+                        gdb_cmd_memread(ks);
+                        break;
+                case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
+                        gdb_cmd_memwrite(ks);
+                        break;
+                case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
+                        gdb_cmd_binwrite(ks);
+                        break;
+                        /* kill or detach. KGDB should treat this like a
+                         * continue.
+                         */
+                case 'D': /* Debugger detach */
+                case 'k': /* Debugger detach via kill */
+                        gdb_cmd_detachkill(ks);
+                        goto default_handle;
+                case 'R': /* Reboot */
+                        if (gdb_cmd_reboot(ks))
+                                goto default_handle;
+                        break;
+                case 'q': /* query command */
+                        gdb_cmd_query(ks);
+                        break;
+                case 'H': /* task related */
+                        gdb_cmd_task(ks);
+                        break;
+                case 'T': /* Query thread status */
+                        gdb_cmd_thread(ks);
+                        break;
+                case 'z': /* Break point remove */
+                case 'Z': /* Break point set */
+                        gdb_cmd_break(ks);
+                        break;
+#ifdef CONFIG_KGDB_KDB
+                case '3': /* Escape into back into kdb */
+                        if (remcom_in_buffer[1] == '\0') {
+                                gdb_cmd_detachkill(ks);
+                                return DBG_PASS_EVENT;
+                        }
+#endif
+                case 'C': /* Exception passing */
+                        tmp = gdb_cmd_exception_pass(ks);
+                        if (tmp > 0)
+                                goto default_handle;
+                        if (tmp == 0)
+                                break;
+                        /* Fall through on tmp < 0 */
+                case 'c': /* Continue packet */
+                case 's': /* Single step packet */
+                        if (kgdb_contthread && kgdb_contthread != current) {
+                                /* Can't switch threads in kgdb */
+                                error_packet(remcom_out_buffer, -EINVAL);
+                                break;
+                        }
+                        dbg_activate_sw_breakpoints();
+                        /* Fall through to default processing */
+                default:
+default_handle:
+                        error = kgdb_arch_handle_exception(ks->ex_vector,
+                                                ks->signo,
+                                                ks->err_code,
+                                                remcom_in_buffer,
+                                                remcom_out_buffer,
+                                                ks->linux_regs);
+                        /*
+                         * Leave cmd processing on error, detach,
+                         * kill, continue, or single step.
+                         */
+                        if (error >= 0 || remcom_in_buffer[0] == 'D' ||
+                            remcom_in_buffer[0] == 'k') {
+                                error = 0;
+                                goto kgdb_exit;
+                        }
+
+                }
+
+                /* reply to the request */
+                put_packet(remcom_out_buffer);
+        }
+
+kgdb_exit:
+        if (ks->pass_exception)
+                error = 1;
+        return error;
+}
+
+int gdbstub_state(struct kgdb_state *ks, char *cmd)
+{
+        int error;
+
+        switch (cmd[0]) {
+        case 'e':
+                error = kgdb_arch_handle_exception(ks->ex_vector,
+                                                   ks->signo,
+                                                   ks->err_code,
+                                                   remcom_in_buffer,
+                                                   remcom_out_buffer,
+                                                   ks->linux_regs);
+                return error;
+        case 's':
+        case 'c':
+                strcpy(remcom_in_buffer, cmd);
+                return 0;
+        case '?':
+                gdb_cmd_status(ks);
+                break;
+        case '\0':
+                strcpy(remcom_out_buffer, "");
+                break;
+        }
+        dbg_io_ops->write_char('+');
+        put_packet(remcom_out_buffer);
+        return 0;
+}
diff --git a/kernel/debug/kdb/.gitignore b/kernel/debug/kdb/.gitignore
new file mode 100644
index 000000000000..396d12eda9e8
--- /dev/null
+++ b/kernel/debug/kdb/.gitignore
@@ -0,0 +1 @@
+gen-kdb_cmds.c
diff --git a/kernel/debug/kdb/Makefile b/kernel/debug/kdb/Makefile
new file mode 100644
index 000000000000..d4fc58f4b88d
--- /dev/null
+++ b/kernel/debug/kdb/Makefile
@@ -0,0 +1,25 @@
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (c) 1999-2004 Silicon Graphics, Inc.  All Rights Reserved.
+# Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+#
+
+CCVERSION       := $(shell $(CC) -v 2>&1 | sed -ne '$$p')
+obj-y := kdb_io.o kdb_main.o kdb_support.o kdb_bt.o gen-kdb_cmds.o kdb_bp.o kdb_debugger.o
+obj-$(CONFIG_KDB_KEYBOARD)    += kdb_keyboard.o
+
+clean-files := gen-kdb_cmds.c
+
+quiet_cmd_gen-kdb = GENKDB  $@
+      cmd_gen-kdb = $(AWK) 'BEGIN {print "\#include <linux/stddef.h>"; print "\#include <linux/init.h>"} \
+                /^\#/{next} \
+                /^[ \t]*$$/{next} \
+                {gsub(/"/, "\\\"", $$0); \
+                  print "static __initdata char kdb_cmd" cmds++ "[] = \"" $$0 "\\n\";"} \
+                END {print "extern char *kdb_cmds[]; char __initdata *kdb_cmds[] = {"; for (i = 0; i < cmds; ++i) {print "  kdb_cmd" i ","}; print("  NULL\n};");}' \
+                $(filter-out %/Makefile,$^) > $@#
+
+$(obj)/gen-kdb_cmds.c:  $(src)/kdb_cmds $(src)/Makefile
+        $(call cmd,gen-kdb)
diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
new file mode 100644
index 000000000000..75bd9b3ebbb7
--- /dev/null
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -0,0 +1,564 @@
+/*
+ * Kernel Debugger Architecture Independent Breakpoint Handler
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kdb.h>
+#include <linux/kgdb.h>
+#include <linux/smp.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include "kdb_private.h"
+
+/*
+ * Table of kdb_breakpoints
+ */
+kdb_bp_t kdb_breakpoints[KDB_MAXBPT];
+
+static void kdb_setsinglestep(struct pt_regs *regs)
+{
+        KDB_STATE_SET(DOING_SS);
+}
+
+static char *kdb_rwtypes[] = {
+        "Instruction(i)",
+        "Instruction(Register)",
+        "Data Write",
+        "I/O",
+        "Data Access"
+};
+
+static char *kdb_bptype(kdb_bp_t *bp)
+{
+        if (bp->bp_type < 0 || bp->bp_type > 4)
+                return "";
+
+        return kdb_rwtypes[bp->bp_type];
+}
+
+static int kdb_parsebp(int argc, const char **argv, int *nextargp, kdb_bp_t *bp)
+{
+        int nextarg = *nextargp;
+        int diag;
+
+        bp->bph_length = 1;
+        if ((argc + 1) != nextarg) {
+                if (strnicmp(argv[nextarg], "datar", sizeof("datar")) == 0)
+                        bp->bp_type = BP_ACCESS_WATCHPOINT;
+                else if (strnicmp(argv[nextarg], "dataw", sizeof("dataw")) == 0)
+                        bp->bp_type = BP_WRITE_WATCHPOINT;
+                else if (strnicmp(argv[nextarg], "inst", sizeof("inst")) == 0)
+                        bp->bp_type = BP_HARDWARE_BREAKPOINT;
+                else
+                        return KDB_ARGCOUNT;
+
+                bp->bph_length = 1;
+
+                nextarg++;
+
+                if ((argc + 1) != nextarg) {
+                        unsigned long len;
+
+                        diag = kdbgetularg((char *)argv[nextarg],
+                                           &len);
+                        if (diag)
+                                return diag;
+
+
+                        if (len > 8)
+                                return KDB_BADLENGTH;
+
+                        bp->bph_length = len;
+                        nextarg++;
+                }
+
+                if ((argc + 1) != nextarg)
+                        return KDB_ARGCOUNT;
+        }
+
+        *nextargp = nextarg;
+        return 0;
+}
+
+static int _kdb_bp_remove(kdb_bp_t *bp)
+{
+        int ret = 1;
+        if (!bp->bp_installed)
+                return ret;
+        if (!bp->bp_type)
+                ret = dbg_remove_sw_break(bp->bp_addr);
+        else
+                ret = arch_kgdb_ops.remove_hw_breakpoint(bp->bp_addr,
+                         bp->bph_length,
+                         bp->bp_type);
+        if (ret == 0)
+                bp->bp_installed = 0;
+        return ret;
+}
+
+static void kdb_handle_bp(struct pt_regs *regs, kdb_bp_t *bp)
+{
+        if (KDB_DEBUG(BP))
+                kdb_printf("regs->ip = 0x%lx\n", instruction_pointer(regs));
+
+        /*
+         * Setup single step
+         */
+        kdb_setsinglestep(regs);
+
+        /*
+         * Reset delay attribute
+         */
+        bp->bp_delay = 0;
+        bp->bp_delayed = 1;
+}
+
+static int _kdb_bp_install(struct pt_regs *regs, kdb_bp_t *bp)
+{
+        int ret;
+        /*
+         * Install the breakpoint, if it is not already installed.
+         */
+
+        if (KDB_DEBUG(BP))
+                kdb_printf("%s: bp_installed %d\n",
+                           __func__, bp->bp_installed);
+        if (!KDB_STATE(SSBPT))
+                bp->bp_delay = 0;
+        if (bp->bp_installed)
+                return 1;
+        if (bp->bp_delay || (bp->bp_delayed && KDB_STATE(DOING_SS))) {
+                if (KDB_DEBUG(BP))
+                        kdb_printf("%s: delayed bp\n", __func__);
+                kdb_handle_bp(regs, bp);
+                return 0;
+        }
+        if (!bp->bp_type)
+                ret = dbg_set_sw_break(bp->bp_addr);
+        else
+                ret = arch_kgdb_ops.set_hw_breakpoint(bp->bp_addr,
+                         bp->bph_length,
+                         bp->bp_type);
+        if (ret == 0) {
+                bp->bp_installed = 1;
+        } else {
+                kdb_printf("%s: failed to set breakpoint at 0x%lx\n",
+                           __func__, bp->bp_addr);
+                return 1;
+        }
+        return 0;
+}
+
+/*
+ * kdb_bp_install
+ *
+ *      Install kdb_breakpoints prior to returning from the
+ *      kernel debugger.  This allows the kdb_breakpoints to be set
+ *      upon functions that are used internally by kdb, such as
+ *      printk().  This function is only called once per kdb session.
+ */
+void kdb_bp_install(struct pt_regs *regs)
+{
+        int i;
+
+        for (i = 0; i < KDB_MAXBPT; i++) {
+                kdb_bp_t *bp = &kdb_breakpoints[i];
+
+                if (KDB_DEBUG(BP)) {
+                        kdb_printf("%s: bp %d bp_enabled %d\n",
+                                   __func__, i, bp->bp_enabled);
+                }
+                if (bp->bp_enabled)
+                        _kdb_bp_install(regs, bp);
+        }
+}
+
+/*
+ * kdb_bp_remove
+ *
+ *      Remove kdb_breakpoints upon entry to the kernel debugger.
+ *
+ * Parameters:
+ *      None.
+ * Outputs:
+ *      None.
+ * Returns:
+ *      None.
+ * Locking:
+ *      None.
+ * Remarks:
+ */
+void kdb_bp_remove(void)
+{
+        int i;
+
+        for (i = KDB_MAXBPT - 1; i >= 0; i--) {
+                kdb_bp_t *bp = &kdb_breakpoints[i];
+
+                if (KDB_DEBUG(BP)) {
+                        kdb_printf("%s: bp %d bp_enabled %d\n",
+                                   __func__, i, bp->bp_enabled);
+                }
+                if (bp->bp_enabled)
+                        _kdb_bp_remove(bp);
+        }
+}
+
+
+/*
+ * kdb_printbp
+ *
+ *      Internal function to format and print a breakpoint entry.
+ *
+ * Parameters:
+ *      None.
+ * Outputs:
+ *      None.
+ * Returns:
+ *      None.
+ * Locking:
+ *      None.
+ * Remarks:
+ */
+
+static void kdb_printbp(kdb_bp_t *bp, int i)
+{
+        kdb_printf("%s ", kdb_bptype(bp));
+        kdb_printf("BP #%d at ", i);
+        kdb_symbol_print(bp->bp_addr, NULL, KDB_SP_DEFAULT);
+
+        if (bp->bp_enabled)
+                kdb_printf("\n    is enabled");
+        else
+                kdb_printf("\n    is disabled");
+
+        kdb_printf("\taddr at %016lx, hardtype=%d installed=%d\n",
+                   bp->bp_addr, bp->bp_type, bp->bp_installed);
+
+        kdb_printf("\n");
+}
+
+/*
+ * kdb_bp
+ *
+ *      Handle the bp commands.
+ *
+ *      [bp|bph] <addr-expression> [DATAR|DATAW]
+ *
+ * Parameters:
+ *      argc    Count of arguments in argv
+ *      argv    Space delimited command line arguments
+ * Outputs:
+ *      None.
+ * Returns:
+ *      Zero for success, a kdb diagnostic if failure.
+ * Locking:
+ *      None.
+ * Remarks:
+ *
+ *      bp      Set breakpoint on all cpus.  Only use hardware assist if need.
+ *      bph     Set breakpoint on all cpus.  Force hardware register
+ */
+
+static int kdb_bp(int argc, const char **argv)
+{
+        int i, bpno;
+        kdb_bp_t *bp, *bp_check;
+        int diag;
+        int free;
+        char *symname = NULL;
+        long offset = 0ul;
+        int nextarg;
+        kdb_bp_t template = {0};
+
+        if (argc == 0) {
+                /*
+                 * Display breakpoint table
+                 */
+                for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT;
+                     bpno++, bp++) {
+                        if (bp->bp_free)
+                                continue;
+                        kdb_printbp(bp, bpno);
+                }
+
+                return 0;
+        }
+
+        nextarg = 1;
+        diag = kdbgetaddrarg(argc, argv, &nextarg, &template.bp_addr,
+                             &offset, &symname);
+        if (diag)
+                return diag;
+        if (!template.bp_addr)
+                return KDB_BADINT;
+
+        /*
+         * Find an empty bp structure to allocate
+         */
+        free = KDB_MAXBPT;
+        for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT; bpno++, bp++) {
+                if (bp->bp_free)
+                        break;
+        }
+
+        if (bpno == KDB_MAXBPT)
+                return KDB_TOOMANYBPT;
+
+        if (strcmp(argv[0], "bph") == 0) {
+                template.bp_type = BP_HARDWARE_BREAKPOINT;
+                diag = kdb_parsebp(argc, argv, &nextarg, &template);
+                if (diag)
+                        return diag;
+        } else {
+                template.bp_type = BP_BREAKPOINT;
+        }
+
+        /*
+         * Check for clashing breakpoints.
+         *
+         * Note, in this design we can't have hardware breakpoints
+         * enabled for both read and write on the same address.
+         */
+        for (i = 0, bp_check = kdb_breakpoints; i < KDB_MAXBPT;
+             i++, bp_check++) {
+                if (!bp_check->bp_free &&
+                    bp_check->bp_addr == template.bp_addr) {
+                        kdb_printf("You already have a breakpoint at "
+                                   kdb_bfd_vma_fmt0 "\n", template.bp_addr);
+                        return KDB_DUPBPT;
+                }
+        }
+
+        template.bp_enabled = 1;
+
+        /*
+         * Actually allocate the breakpoint found earlier
+         */
+        *bp = template;
+        bp->bp_free = 0;
+
+        kdb_printbp(bp, bpno);
+
+        return 0;
+}
+
+/*
+ * kdb_bc
+ *
+ *      Handles the 'bc', 'be', and 'bd' commands
+ *
+ *      [bd|bc|be] <breakpoint-number>
+ *      [bd|bc|be] *
+ *
+ * Parameters:
+ *      argc    Count of arguments in argv
+ *      argv    Space delimited command line arguments
+ * Outputs:
+ *      None.
+ * Returns:
+ *      Zero for success, a kdb diagnostic for failure
+ * Locking:
+ *      None.
+ * Remarks:
+ */
+static int kdb_bc(int argc, const char **argv)
+{
+        unsigned long addr;
+        kdb_bp_t *bp = NULL;
+        int lowbp = KDB_MAXBPT;
+        int highbp = 0;
+        int done = 0;
+        int i;
+        int diag = 0;
+
+        int cmd;                        /* KDBCMD_B? */
+#define KDBCMD_BC       0
+#define KDBCMD_BE       1
+#define KDBCMD_BD       2
+
+        if (strcmp(argv[0], "be") == 0)
+                cmd = KDBCMD_BE;
+        else if (strcmp(argv[0], "bd") == 0)
+                cmd = KDBCMD_BD;
+        else
+                cmd = KDBCMD_BC;
+
+        if (argc != 1)
+                return KDB_ARGCOUNT;
+
+        if (strcmp(argv[1], "*") == 0) {
+                lowbp = 0;
+                highbp = KDB_MAXBPT;
+        } else {
+                diag = kdbgetularg(argv[1], &addr);
+                if (diag)
+                        return diag;
+
+                /*
+                 * For addresses less than the maximum breakpoint number,
+                 * assume that the breakpoint number is desired.
+                 */
+                if (addr < KDB_MAXBPT) {
+                        bp = &kdb_breakpoints[addr];
+                        lowbp = highbp = addr;
+                        highbp++;
+                } else {
+                        for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT;
+                            i++, bp++) {
+                                if (bp->bp_addr == addr) {
+                                        lowbp = highbp = i;
+                                        highbp++;
+                                        break;
+                                }
+                        }
+                }
+        }
+
+        /*
+         * Now operate on the set of breakpoints matching the input
+         * criteria (either '*' for all, or an individual breakpoint).
+         */
+        for (bp = &kdb_breakpoints[lowbp], i = lowbp;
+            i < highbp;
+            i++, bp++) {
+                if (bp->bp_free)
+                        continue;
+
+                done++;
+
+                switch (cmd) {
+                case KDBCMD_BC:
+                        bp->bp_enabled = 0;
+
+                        kdb_printf("Breakpoint %d at "
+                                   kdb_bfd_vma_fmt " cleared\n",
+                                   i, bp->bp_addr);
+
+                        bp->bp_addr = 0;
+                        bp->bp_free = 1;
+
+                        break;
+                case KDBCMD_BE:
+                        bp->bp_enabled = 1;
+
+                        kdb_printf("Breakpoint %d at "
+                                   kdb_bfd_vma_fmt " enabled",
+                                   i, bp->bp_addr);
+
+                        kdb_printf("\n");
+                        break;
+                case KDBCMD_BD:
+                        if (!bp->bp_enabled)
+                                break;
+
+                        bp->bp_enabled = 0;
+
+                        kdb_printf("Breakpoint %d at "
+                                   kdb_bfd_vma_fmt " disabled\n",
+                                   i, bp->bp_addr);
+
+                        break;
+                }
+                if (bp->bp_delay && (cmd == KDBCMD_BC || cmd == KDBCMD_BD)) {
+                        bp->bp_delay = 0;
+                        KDB_STATE_CLEAR(SSBPT);
+                }
+        }
+
+        return (!done) ? KDB_BPTNOTFOUND : 0;
+}
+
+/*
+ * kdb_ss
+ *
+ *      Process the 'ss' (Single Step) and 'ssb' (Single Step to Branch)
+ *      commands.
+ *
+ *      ss
+ *      ssb
+ *
+ * Parameters:
+ *      argc    Argument count
+ *      argv    Argument vector
+ * Outputs:
+ *      None.
+ * Returns:
+ *      KDB_CMD_SS[B] for success, a kdb error if failure.
+ * Locking:
+ *      None.
+ * Remarks:
+ *
+ *      Set the arch specific option to trigger a debug trap after the next
+ *      instruction.
+ *
+ *      For 'ssb', set the trace flag in the debug trap handler
+ *      after printing the current insn and return directly without
+ *      invoking the kdb command processor, until a branch instruction
+ *      is encountered.
+ */
+
+static int kdb_ss(int argc, const char **argv)
+{
+        int ssb = 0;
+
+        ssb = (strcmp(argv[0], "ssb") == 0);
+        if (argc != 0)
+                return KDB_ARGCOUNT;
+        /*
+         * Set trace flag and go.
+         */
+        KDB_STATE_SET(DOING_SS);
+        if (ssb) {
+                KDB_STATE_SET(DOING_SSB);
+                return KDB_CMD_SSB;
+        }
+        return KDB_CMD_SS;
+}
+
+/* Initialize the breakpoint table and register breakpoint commands. */
+
+void __init kdb_initbptab(void)
+{
+        int i;
+        kdb_bp_t *bp;
+
+        /*
+         * First time initialization.
+         */
+        memset(&kdb_breakpoints, '\0', sizeof(kdb_breakpoints));
+
+        for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++)
+                bp->bp_free = 1;
+
+        kdb_register_repeat("bp", kdb_bp, "[<vaddr>]",
+                "Set/Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("bl", kdb_bp, "[<vaddr>]",
+                "Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
+        if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT)
+                kdb_register_repeat("bph", kdb_bp, "[<vaddr>]",
+                "[datar [length]|dataw [length]]   Set hw brk", 0, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("bc", kdb_bc, "<bpnum>",
+                "Clear Breakpoint", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("be", kdb_bc, "<bpnum>",
+                "Enable Breakpoint", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("bd", kdb_bc, "<bpnum>",
+                "Disable Breakpoint", 0, KDB_REPEAT_NONE);
+
+        kdb_register_repeat("ss", kdb_ss, "",
+                "Single Step", 1, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("ssb", kdb_ss, "",
+                "Single step to branch/call", 0, KDB_REPEAT_NO_ARGS);
+        /*
+         * Architecture dependent initialization.
+         */
+}
diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c
new file mode 100644
index 000000000000..2f62fe85f16a
--- /dev/null
+++ b/kernel/debug/kdb/kdb_bt.c
@@ -0,0 +1,210 @@
+/*
+ * Kernel Debugger Architecture Independent Stack Traceback
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kdb.h>
+#include <linux/nmi.h>
+#include <asm/system.h>
+#include "kdb_private.h"
+
+
+static void kdb_show_stack(struct task_struct *p, void *addr)
+{
+        int old_lvl = console_loglevel;
+        console_loglevel = 15;
+        kdb_trap_printk++;
+        kdb_set_current_task(p);
+        if (addr) {
+                show_stack((struct task_struct *)p, addr);
+        } else if (kdb_current_regs) {
+#ifdef CONFIG_X86
+                show_stack(p, &kdb_current_regs->sp);
+#else
+                show_stack(p, NULL);
+#endif
+        } else {
+                show_stack(p, NULL);
+        }
+        console_loglevel = old_lvl;
+        kdb_trap_printk--;
+}
+
+/*
+ * kdb_bt
+ *
+ *      This function implements the 'bt' command.  Print a stack
+ *      traceback.
+ *
+ *      bt [<address-expression>]       (addr-exp is for alternate stacks)
+ *      btp <pid>                       Kernel stack for <pid>
+ *      btt <address-expression>        Kernel stack for task structure at
+ *                                      <address-expression>
+ *      bta [DRSTCZEUIMA]               All useful processes, optionally
+ *                                      filtered by state
+ *      btc [<cpu>]                     The current process on one cpu,
+ *                                      default is all cpus
+ *
+ *      bt <address-expression> refers to a address on the stack, that location
+ *      is assumed to contain a return address.
+ *
+ *      btt <address-expression> refers to the address of a struct task.
+ *
+ * Inputs:
+ *      argc    argument count
+ *      argv    argument vector
+ * Outputs:
+ *      None.
+ * Returns:
+ *      zero for success, a kdb diagnostic if error
+ * Locking:
+ *      none.
+ * Remarks:
+ *      Backtrack works best when the code uses frame pointers.  But even
+ *      without frame pointers we should get a reasonable trace.
+ *
+ *      mds comes in handy when examining the stack to do a manual traceback or
+ *      to get a starting point for bt <address-expression>.
+ */
+
+static int
+kdb_bt1(struct task_struct *p, unsigned long mask,
+        int argcount, int btaprompt)
+{
+        char buffer[2];
+        if (kdb_getarea(buffer[0], (unsigned long)p) ||
+            kdb_getarea(buffer[0], (unsigned long)(p+1)-1))
+                return KDB_BADADDR;
+        if (!kdb_task_state(p, mask))
+                return 0;
+        kdb_printf("Stack traceback for pid %d\n", p->pid);
+        kdb_ps1(p);
+        kdb_show_stack(p, NULL);
+        if (btaprompt) {
+                kdb_getstr(buffer, sizeof(buffer),
+                           "Enter <q> to end, <cr> to continue:");
+                if (buffer[0] == 'q') {
+                        kdb_printf("\n");
+                        return 1;
+                }
+        }
+        touch_nmi_watchdog();
+        return 0;
+}
+
+int
+kdb_bt(int argc, const char **argv)
+{
+        int diag;
+        int argcount = 5;
+        int btaprompt = 1;
+        int nextarg;
+        unsigned long addr;
+        long offset;
+
+        kdbgetintenv("BTARGS", &argcount);      /* Arguments to print */
+        kdbgetintenv("BTAPROMPT", &btaprompt);  /* Prompt after each
+                                                 * proc in bta */
+
+        if (strcmp(argv[0], "bta") == 0) {
+                struct task_struct *g, *p;
+                unsigned long cpu;
+                unsigned long mask = kdb_task_state_string(argc ? argv[1] :
+                                                           NULL);
+                if (argc == 0)
+                        kdb_ps_suppressed();
+                /* Run the active tasks first */
+                for_each_online_cpu(cpu) {
+                        p = kdb_curr_task(cpu);
+                        if (kdb_bt1(p, mask, argcount, btaprompt))
+                                return 0;
+                }
+                /* Now the inactive tasks */
+                kdb_do_each_thread(g, p) {
+                        if (task_curr(p))
+                                continue;
+                        if (kdb_bt1(p, mask, argcount, btaprompt))
+                                return 0;
+                } kdb_while_each_thread(g, p);
+        } else if (strcmp(argv[0], "btp") == 0) {
+                struct task_struct *p;
+                unsigned long pid;
+                if (argc != 1)
+                        return KDB_ARGCOUNT;
+                diag = kdbgetularg((char *)argv[1], &pid);
+                if (diag)
+                        return diag;
+                p = find_task_by_pid_ns(pid, &init_pid_ns);
+                if (p) {
+                        kdb_set_current_task(p);
+                        return kdb_bt1(p, ~0UL, argcount, 0);
+                }
+                kdb_printf("No process with pid == %ld found\n", pid);
+                return 0;
+        } else if (strcmp(argv[0], "btt") == 0) {
+                if (argc != 1)
+                        return KDB_ARGCOUNT;
+                diag = kdbgetularg((char *)argv[1], &addr);
+                if (diag)
+                        return diag;
+                kdb_set_current_task((struct task_struct *)addr);
+                return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0);
+        } else if (strcmp(argv[0], "btc") == 0) {
+                unsigned long cpu = ~0;
+                struct task_struct *save_current_task = kdb_current_task;
+                char buf[80];
+                if (argc > 1)
+                        return KDB_ARGCOUNT;
+                if (argc == 1) {
+                        diag = kdbgetularg((char *)argv[1], &cpu);
+                        if (diag)
+                                return diag;
+                }
+                /* Recursive use of kdb_parse, do not use argv after
+                 * this point */
+                argv = NULL;
+                if (cpu != ~0) {
+                        if (cpu >= num_possible_cpus() || !cpu_online(cpu)) {
+                                kdb_printf("no process for cpu %ld\n", cpu);
+                                return 0;
+                        }
+                        sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
+                        kdb_parse(buf);
+                        return 0;
+                }
+                kdb_printf("btc: cpu status: ");
+                kdb_parse("cpu\n");
+                for_each_online_cpu(cpu) {
+                        sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
+                        kdb_parse(buf);
+                        touch_nmi_watchdog();
+                }
+                kdb_set_current_task(save_current_task);
+                return 0;
+        } else {
+                if (argc) {
+                        nextarg = 1;
+                        diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
+                                             &offset, NULL);
+                        if (diag)
+                                return diag;
+                        kdb_show_stack(kdb_current_task, (void *)addr);
+                        return 0;
+                } else {
+                        return kdb_bt1(kdb_current_task, ~0UL, argcount, 0);
+                }
+        }
+
+        /* NOTREACHED */
+        return 0;
+}
diff --git a/kernel/debug/kdb/kdb_cmds b/kernel/debug/kdb/kdb_cmds
new file mode 100644
index 000000000000..56c88e4db309
--- /dev/null
+++ b/kernel/debug/kdb/kdb_cmds
@@ -0,0 +1,35 @@
+# Initial commands for kdb, alter to suit your needs.
+# These commands are executed in kdb_init() context, no SMP, no
+# processes.  Commands that require process data (including stack or
+# registers) are not reliable this early.  set and bp commands should
+# be safe.  Global breakpoint commands affect each cpu as it is booted.
+
+# Standard debugging information for first level support, just type archkdb
+# or archkdbcpu or archkdbshort at the kdb prompt.
+
+defcmd dumpcommon "" "Common kdb debugging"
+  set BTAPROMPT 0
+  set LINES 10000
+  -summary
+  -cpu
+  -ps
+  -dmesg 600
+  -bt
+endefcmd
+
+defcmd dumpall "" "First line debugging"
+  set BTSYMARG 1
+  set BTARGS 9
+  pid R
+  -dumpcommon
+  -bta
+endefcmd
+
+defcmd dumpcpu "" "Same as dumpall but only tasks on cpus"
+  set BTSYMARG 1
+  set BTARGS 9
+  pid R
+  -dumpcommon
+  -btc
+endefcmd
+
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c
new file mode 100644
index 000000000000..bf6e8270e957
--- /dev/null
+++ b/kernel/debug/kdb/kdb_debugger.c
@@ -0,0 +1,169 @@
+/*
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/kdebug.h>
+#include "kdb_private.h"
+#include "../debug_core.h"
+
+/*
+ * KDB interface to KGDB internals
+ */
+get_char_func kdb_poll_funcs[] = {
+        dbg_io_get_char,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+};
+EXPORT_SYMBOL_GPL(kdb_poll_funcs);
+
+int kdb_poll_idx = 1;
+EXPORT_SYMBOL_GPL(kdb_poll_idx);
+
+int kdb_stub(struct kgdb_state *ks)
+{
+        int error = 0;
+        kdb_bp_t *bp;
+        unsigned long addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
+        kdb_reason_t reason = KDB_REASON_OOPS;
+        kdb_dbtrap_t db_result = KDB_DB_NOBPT;
+        int i;
+
+        if (KDB_STATE(REENTRY)) {
+                reason = KDB_REASON_SWITCH;
+                KDB_STATE_CLEAR(REENTRY);
+                addr = instruction_pointer(ks->linux_regs);
+        }
+        ks->pass_exception = 0;
+        if (atomic_read(&kgdb_setting_breakpoint))
+                reason = KDB_REASON_KEYBOARD;
+
+        for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+                if ((bp->bp_enabled) && (bp->bp_addr == addr)) {
+                        reason = KDB_REASON_BREAK;
+                        db_result = KDB_DB_BPT;
+                        if (addr != instruction_pointer(ks->linux_regs))
+                                kgdb_arch_set_pc(ks->linux_regs, addr);
+                        break;
+                }
+        }
+        if (reason == KDB_REASON_BREAK || reason == KDB_REASON_SWITCH) {
+                for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+                        if (bp->bp_free)
+                                continue;
+                        if (bp->bp_addr == addr) {
+                                bp->bp_delay = 1;
+                                bp->bp_delayed = 1;
+        /*
+         * SSBPT is set when the kernel debugger must single step a
+         * task in order to re-establish an instruction breakpoint
+         * which uses the instruction replacement mechanism.  It is
+         * cleared by any action that removes the need to single-step
+         * the breakpoint.
+         */
+                                reason = KDB_REASON_BREAK;
+                                db_result = KDB_DB_BPT;
+                                KDB_STATE_SET(SSBPT);
+                                break;
+                        }
+                }
+        }
+
+        if (reason != KDB_REASON_BREAK && ks->ex_vector == 0 &&
+                ks->signo == SIGTRAP) {
+                reason = KDB_REASON_SSTEP;
+                db_result = KDB_DB_BPT;
+        }
+        /* Set initial kdb state variables */
+        KDB_STATE_CLEAR(KGDB_TRANS);
+        kdb_initial_cpu = ks->cpu;
+        kdb_current_task = kgdb_info[ks->cpu].task;
+        kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo;
+        /* Remove any breakpoints as needed by kdb and clear single step */
+        kdb_bp_remove();
+        KDB_STATE_CLEAR(DOING_SS);
+        KDB_STATE_CLEAR(DOING_SSB);
+        KDB_STATE_SET(PAGER);
+        /* zero out any offline cpu data */
+        for_each_present_cpu(i) {
+                if (!cpu_online(i)) {
+                        kgdb_info[i].debuggerinfo = NULL;
+                        kgdb_info[i].task = NULL;
+                }
+        }
+        if (ks->err_code == DIE_OOPS || reason == KDB_REASON_OOPS) {
+                ks->pass_exception = 1;
+                KDB_FLAG_SET(CATASTROPHIC);
+        }
+        kdb_initial_cpu = ks->cpu;
+        if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) {
+                KDB_STATE_CLEAR(SSBPT);
+                KDB_STATE_CLEAR(DOING_SS);
+        } else {
+                /* Start kdb main loop */
+                error = kdb_main_loop(KDB_REASON_ENTER, reason,
+                                      ks->err_code, db_result, ks->linux_regs);
+        }
+        /*
+         * Upon exit from the kdb main loop setup break points and restart
+         * the system based on the requested continue state
+         */
+        kdb_initial_cpu = -1;
+        kdb_current_task = NULL;
+        kdb_current_regs = NULL;
+        KDB_STATE_CLEAR(PAGER);
+        kdbnearsym_cleanup();
+        if (error == KDB_CMD_KGDB) {
+                if (KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)) {
+        /*
+         * This inteface glue which allows kdb to transition in into
+         * the gdb stub.  In order to do this the '?' or '' gdb serial
+         * packet response is processed here.  And then control is
+         * passed to the gdbstub.
+         */
+                        if (KDB_STATE(DOING_KGDB))
+                                gdbstub_state(ks, "?");
+                        else
+                                gdbstub_state(ks, "");
+                        KDB_STATE_CLEAR(DOING_KGDB);
+                        KDB_STATE_CLEAR(DOING_KGDB2);
+                }
+                return DBG_PASS_EVENT;
+        }
+        kdb_bp_install(ks->linux_regs);
+        dbg_activate_sw_breakpoints();
+        /* Set the exit state to a single step or a continue */
+        if (KDB_STATE(DOING_SS))
+                gdbstub_state(ks, "s");
+        else
+                gdbstub_state(ks, "c");
+
+        KDB_FLAG_CLEAR(CATASTROPHIC);
+
+        /* Invoke arch specific exception handling prior to system resume */
+        kgdb_info[ks->cpu].ret_state = gdbstub_state(ks, "e");
+        if (ks->pass_exception)
+                kgdb_info[ks->cpu].ret_state = 1;
+        if (error == KDB_CMD_CPU) {
+                KDB_STATE_SET(REENTRY);
+                /*
+                 * Force clear the single step bit because kdb emulates this
+                 * differently vs the gdbstub
+                 */
+                kgdb_single_step = 0;
+                dbg_deactivate_sw_breakpoints();
+                return DBG_SWITCH_CPU_EVENT;
+        }
+        return kgdb_info[ks->cpu].ret_state;
+}
+
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
new file mode 100644
index 000000000000..c9b7f4f90bba
--- /dev/null
+++ b/kernel/debug/kdb/kdb_io.c
@@ -0,0 +1,826 @@
+/*
+ * Kernel Debugger Architecture Independent Console I/O handler
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2006 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kdev_t.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/nmi.h>
+#include <linux/delay.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/kallsyms.h>
+#include "kdb_private.h"
+
+#define CMD_BUFLEN 256
+char kdb_prompt_str[CMD_BUFLEN];
+
+int kdb_trap_printk;
+
+static void kgdb_transition_check(char *buffer)
+{
+        int slen = strlen(buffer);
+        if (strncmp(buffer, "$?#3f", slen) != 0 &&
+            strncmp(buffer, "$qSupported#37", slen) != 0 &&
+            strncmp(buffer, "+$qSupported#37", slen) != 0) {
+                KDB_STATE_SET(KGDB_TRANS);
+                kdb_printf("%s", buffer);
+        }
+}
+
+static int kdb_read_get_key(char *buffer, size_t bufsize)
+{
+#define ESCAPE_UDELAY 1000
+#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
+        char escape_data[5];    /* longest vt100 escape sequence is 4 bytes */
+        char *ped = escape_data;
+        int escape_delay = 0;
+        get_char_func *f, *f_escape = NULL;
+        int key;
+
+        for (f = &kdb_poll_funcs[0]; ; ++f) {
+                if (*f == NULL) {
+                        /* Reset NMI watchdog once per poll loop */
+                        touch_nmi_watchdog();
+                        f = &kdb_poll_funcs[0];
+                }
+                if (escape_delay == 2) {
+                        *ped = '\0';
+                        ped = escape_data;
+                        --escape_delay;
+                }
+                if (escape_delay == 1) {
+                        key = *ped++;
+                        if (!*ped)
+                                --escape_delay;
+                        break;
+                }
+                key = (*f)();
+                if (key == -1) {
+                        if (escape_delay) {
+                                udelay(ESCAPE_UDELAY);
+                                --escape_delay;
+                        }
+                        continue;
+                }
+                if (bufsize <= 2) {
+                        if (key == '\r')
+                                key = '\n';
+                        *buffer++ = key;
+                        *buffer = '\0';
+                        return -1;
+                }
+                if (escape_delay == 0 && key == '\e') {
+                        escape_delay = ESCAPE_DELAY;
+                        ped = escape_data;
+                        f_escape = f;
+                }
+                if (escape_delay) {
+                        *ped++ = key;
+                        if (f_escape != f) {
+                                escape_delay = 2;
+                                continue;
+                        }
+                        if (ped - escape_data == 1) {
+                                /* \e */
+                                continue;
+                        } else if (ped - escape_data == 2) {
+                                /* \e<something> */
+                                if (key != '[')
+                                        escape_delay = 2;
+                                continue;
+                        } else if (ped - escape_data == 3) {
+                                /* \e[<something> */
+                                int mapkey = 0;
+                                switch (key) {
+                                case 'A': /* \e[A, up arrow */
+                                        mapkey = 16;
+                                        break;
+                                case 'B': /* \e[B, down arrow */
+                                        mapkey = 14;
+                                        break;
+                                case 'C': /* \e[C, right arrow */
+                                        mapkey = 6;
+                                        break;
+                                case 'D': /* \e[D, left arrow */
+                                        mapkey = 2;
+                                        break;
+                                case '1': /* dropthrough */
+                                case '3': /* dropthrough */
+                                /* \e[<1,3,4>], may be home, del, end */
+                                case '4':
+                                        mapkey = -1;
+                                        break;
+                                }
+                                if (mapkey != -1) {
+                                        if (mapkey > 0) {
+                                                escape_data[0] = mapkey;
+                                                escape_data[1] = '\0';
+                                        }
+                                        escape_delay = 2;
+                                }
+                                continue;
+                        } else if (ped - escape_data == 4) {
+                                /* \e[<1,3,4><something> */
+                                int mapkey = 0;
+                                if (key == '~') {
+                                        switch (escape_data[2]) {
+                                        case '1': /* \e[1~, home */
+                                                mapkey = 1;
+                                                break;
+                                        case '3': /* \e[3~, del */
+                                                mapkey = 4;
+                                                break;
+                                        case '4': /* \e[4~, end */
+                                                mapkey = 5;
+                                                break;
+                                        }
+                                }
+                                if (mapkey > 0) {
+                                        escape_data[0] = mapkey;
+                                        escape_data[1] = '\0';
+                                }
+                                escape_delay = 2;
+                                continue;
+                        }
+                }
+                break;  /* A key to process */
+        }
+        return key;
+}
+
+/*
+ * kdb_read
+ *
+ *      This function reads a string of characters, terminated by
+ *      a newline, or by reaching the end of the supplied buffer,
+ *      from the current kernel debugger console device.
+ * Parameters:
+ *      buffer  - Address of character buffer to receive input characters.
+ *      bufsize - size, in bytes, of the character buffer
+ * Returns:
+ *      Returns a pointer to the buffer containing the received
+ *      character string.  This string will be terminated by a
+ *      newline character.
+ * Locking:
+ *      No locks are required to be held upon entry to this
+ *      function.  It is not reentrant - it relies on the fact
+ *      that while kdb is running on only one "master debug" cpu.
+ * Remarks:
+ *
+ * The buffer size must be >= 2.  A buffer size of 2 means that the caller only
+ * wants a single key.
+ *
+ * An escape key could be the start of a vt100 control sequence such as \e[D
+ * (left arrow) or it could be a character in its own right.  The standard
+ * method for detecting the difference is to wait for 2 seconds to see if there
+ * are any other characters.  kdb is complicated by the lack of a timer service
+ * (interrupts are off), by multiple input sources and by the need to sometimes
+ * return after just one key.  Escape sequence processing has to be done as
+ * states in the polling loop.
+ */
+
+static char *kdb_read(char *buffer, size_t bufsize)
+{
+        char *cp = buffer;
+        char *bufend = buffer+bufsize-2;        /* Reserve space for newline
+                                                 * and null byte */
+        char *lastchar;
+        char *p_tmp;
+        char tmp;
+        static char tmpbuffer[CMD_BUFLEN];
+        int len = strlen(buffer);
+        int len_tmp;
+        int tab = 0;
+        int count;
+        int i;
+        int diag, dtab_count;
+        int key;
+
+
+        diag = kdbgetintenv("DTABCOUNT", &dtab_count);
+        if (diag)
+                dtab_count = 30;
+
+        if (len > 0) {
+                cp += len;
+                if (*(buffer+len-1) == '\n')
+                        cp--;
+        }
+
+        lastchar = cp;
+        *cp = '\0';
+        kdb_printf("%s", buffer);
+poll_again:
+        key = kdb_read_get_key(buffer, bufsize);
+        if (key == -1)
+                return buffer;
+        if (key != 9)
+                tab = 0;
+        switch (key) {
+        case 8: /* backspace */
+                if (cp > buffer) {
+                        if (cp < lastchar) {
+                                memcpy(tmpbuffer, cp, lastchar - cp);
+                                memcpy(cp-1, tmpbuffer, lastchar - cp);
+                        }
+                        *(--lastchar) = '\0';
+                        --cp;
+                        kdb_printf("\b%s \r", cp);
+                        tmp = *cp;
+                        *cp = '\0';
+                        kdb_printf(kdb_prompt_str);
+                        kdb_printf("%s", buffer);
+                        *cp = tmp;
+                }
+                break;
+        case 13: /* enter */
+                *lastchar++ = '\n';
+                *lastchar++ = '\0';
+                kdb_printf("\n");
+                return buffer;
+        case 4: /* Del */
+                if (cp < lastchar) {
+                        memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
+                        memcpy(cp, tmpbuffer, lastchar - cp - 1);
+                        *(--lastchar) = '\0';
+                        kdb_printf("%s \r", cp);
+                        tmp = *cp;
+                        *cp = '\0';
+                        kdb_printf(kdb_prompt_str);
+                        kdb_printf("%s", buffer);
+                        *cp = tmp;
+                }
+                break;
+        case 1: /* Home */
+                if (cp > buffer) {
+                        kdb_printf("\r");
+                        kdb_printf(kdb_prompt_str);
+                        cp = buffer;
+                }
+                break;
+        case 5: /* End */
+                if (cp < lastchar) {
+                        kdb_printf("%s", cp);
+                        cp = lastchar;
+                }
+                break;
+        case 2: /* Left */
+                if (cp > buffer) {
+                        kdb_printf("\b");
+                        --cp;
+                }
+                break;
+        case 14: /* Down */
+                memset(tmpbuffer, ' ',
+                       strlen(kdb_prompt_str) + (lastchar-buffer));
+                *(tmpbuffer+strlen(kdb_prompt_str) +
+                  (lastchar-buffer)) = '\0';
+                kdb_printf("\r%s\r", tmpbuffer);
+                *lastchar = (char)key;
+                *(lastchar+1) = '\0';
+                return lastchar;
+        case 6: /* Right */
+                if (cp < lastchar) {
+                        kdb_printf("%c", *cp);
+                        ++cp;
+                }
+                break;
+        case 16: /* Up */
+                memset(tmpbuffer, ' ',
+                       strlen(kdb_prompt_str) + (lastchar-buffer));
+                *(tmpbuffer+strlen(kdb_prompt_str) +
+                  (lastchar-buffer)) = '\0';
+                kdb_printf("\r%s\r", tmpbuffer);
+                *lastchar = (char)key;
+                *(lastchar+1) = '\0';
+                return lastchar;
+        case 9: /* Tab */
+                if (tab < 2)
+                        ++tab;
+                p_tmp = buffer;
+                while (*p_tmp == ' ')
+                        p_tmp++;
+                if (p_tmp > cp)
+                        break;
+                memcpy(tmpbuffer, p_tmp, cp-p_tmp);
+                *(tmpbuffer + (cp-p_tmp)) = '\0';
+                p_tmp = strrchr(tmpbuffer, ' ');
+                if (p_tmp)
+                        ++p_tmp;
+                else
+                        p_tmp = tmpbuffer;
+                len = strlen(p_tmp);
+                count = kallsyms_symbol_complete(p_tmp,
+                                                 sizeof(tmpbuffer) -
+                                                 (p_tmp - tmpbuffer));
+                if (tab == 2 && count > 0) {
+                        kdb_printf("\n%d symbols are found.", count);
+                        if (count > dtab_count) {
+                                count = dtab_count;
+                                kdb_printf(" But only first %d symbols will"
+                                           " be printed.\nYou can change the"
+                                           " environment variable DTABCOUNT.",
+                                           count);
+                        }
+                        kdb_printf("\n");
+                        for (i = 0; i < count; i++) {
+                                if (kallsyms_symbol_next(p_tmp, i) < 0)
+                                        break;
+                                kdb_printf("%s ", p_tmp);
+                                *(p_tmp + len) = '\0';
+                        }
+                        if (i >= dtab_count)
+                                kdb_printf("...");
+                        kdb_printf("\n");
+                        kdb_printf(kdb_prompt_str);
+                        kdb_printf("%s", buffer);
+                } else if (tab != 2 && count > 0) {
+                        len_tmp = strlen(p_tmp);
+                        strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
+                        len_tmp = strlen(p_tmp);
+                        strncpy(cp, p_tmp+len, len_tmp-len + 1);
+                        len = len_tmp - len;
+                        kdb_printf("%s", cp);
+                        cp += len;
+                        lastchar += len;
+                }
+                kdb_nextline = 1; /* reset output line number */
+                break;
+        default:
+                if (key >= 32 && lastchar < bufend) {
+                        if (cp < lastchar) {
+                                memcpy(tmpbuffer, cp, lastchar - cp);
+                                memcpy(cp+1, tmpbuffer, lastchar - cp);
+                                *++lastchar = '\0';
+                                *cp = key;
+                                kdb_printf("%s\r", cp);
+                                ++cp;
+                                tmp = *cp;
+                                *cp = '\0';
+                                kdb_printf(kdb_prompt_str);
+                                kdb_printf("%s", buffer);
+                                *cp = tmp;
+                        } else {
+                                *++lastchar = '\0';
+                                *cp++ = key;
+                                /* The kgdb transition check will hide
+                                 * printed characters if we think that
+                                 * kgdb is connecting, until the check
+                                 * fails */
+                                if (!KDB_STATE(KGDB_TRANS))
+                                        kgdb_transition_check(buffer);
+                                else
+                                        kdb_printf("%c", key);
+                        }
+                        /* Special escape to kgdb */
+                        if (lastchar - buffer >= 5 &&
+                            strcmp(lastchar - 5, "$?#3f") == 0) {
+                                strcpy(buffer, "kgdb");
+                                KDB_STATE_SET(DOING_KGDB);
+                                return buffer;
+                        }
+                        if (lastchar - buffer >= 14 &&
+                            strcmp(lastchar - 14, "$qSupported#37") == 0) {
+                                strcpy(buffer, "kgdb");
+                                KDB_STATE_SET(DOING_KGDB2);
+                                return buffer;
+                        }
+                }
+                break;
+        }
+        goto poll_again;
+}
+
+/*
+ * kdb_getstr
+ *
+ *      Print the prompt string and read a command from the
+ *      input device.
+ *
+ * Parameters:
+ *      buffer  Address of buffer to receive command
+ *      bufsize Size of buffer in bytes
+ *      prompt  Pointer to string to use as prompt string
+ * Returns:
+ *      Pointer to command buffer.
+ * Locking:
+ *      None.
+ * Remarks:
+ *      For SMP kernels, the processor number will be
+ *      substituted for %d, %x or %o in the prompt.
+ */
+
+char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
+{
+        if (prompt && kdb_prompt_str != prompt)
+                strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
+        kdb_printf(kdb_prompt_str);
+        kdb_nextline = 1;       /* Prompt and input resets line number */
+        return kdb_read(buffer, bufsize);
+}
+
+/*
+ * kdb_input_flush
+ *
+ *      Get rid of any buffered console input.
+ *
+ * Parameters:
+ *      none
+ * Returns:
+ *      nothing
+ * Locking:
+ *      none
+ * Remarks:
+ *      Call this function whenever you want to flush input.  If there is any
+ *      outstanding input, it ignores all characters until there has been no
+ *      data for approximately 1ms.
+ */
+
+static void kdb_input_flush(void)
+{
+        get_char_func *f;
+        int res;
+        int flush_delay = 1;
+        while (flush_delay) {
+                flush_delay--;
+empty:
+                touch_nmi_watchdog();
+                for (f = &kdb_poll_funcs[0]; *f; ++f) {
+                        res = (*f)();
+                        if (res != -1) {
+                                flush_delay = 1;
+                                goto empty;
+                        }
+                }
+                if (flush_delay)
+                        mdelay(1);
+        }
+}
+
+/*
+ * kdb_printf
+ *
+ *      Print a string to the output device(s).
+ *
+ * Parameters:
+ *      printf-like format and optional args.
+ * Returns:
+ *      0
+ * Locking:
+ *      None.
+ * Remarks:
+ *      use 'kdbcons->write()' to avoid polluting 'log_buf' with
+ *      kdb output.
+ *
+ *  If the user is doing a cmd args | grep srch
+ *  then kdb_grepping_flag is set.
+ *  In that case we need to accumulate full lines (ending in \n) before
+ *  searching for the pattern.
+ */
+
+static char kdb_buffer[256];    /* A bit too big to go on stack */
+static char *next_avail = kdb_buffer;
+static int  size_avail;
+static int  suspend_grep;
+
+/*
+ * search arg1 to see if it contains arg2
+ * (kdmain.c provides flags for ^pat and pat$)
+ *
+ * return 1 for found, 0 for not found
+ */
+static int kdb_search_string(char *searched, char *searchfor)
+{
+        char firstchar, *cp;
+        int len1, len2;
+
+        /* not counting the newline at the end of "searched" */
+        len1 = strlen(searched)-1;
+        len2 = strlen(searchfor);
+        if (len1 < len2)
+                return 0;
+        if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
+                return 0;
+        if (kdb_grep_leading) {
+                if (!strncmp(searched, searchfor, len2))
+                        return 1;
+        } else if (kdb_grep_trailing) {
+                if (!strncmp(searched+len1-len2, searchfor, len2))
+                        return 1;
+        } else {
+                firstchar = *searchfor;
+                cp = searched;
+                while ((cp = strchr(cp, firstchar))) {
+                        if (!strncmp(cp, searchfor, len2))
+                                return 1;
+                        cp++;
+                }
+        }
+        return 0;
+}
+
+int vkdb_printf(const char *fmt, va_list ap)
+{
+        int diag;
+        int linecount;
+        int logging, saved_loglevel = 0;
+        int saved_trap_printk;
+        int got_printf_lock = 0;
+        int retlen = 0;
+        int fnd, len;
+        char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
+        char *moreprompt = "more> ";
+        struct console *c = console_drivers;
+        static DEFINE_SPINLOCK(kdb_printf_lock);
+        unsigned long uninitialized_var(flags);
+
+        preempt_disable();
+        saved_trap_printk = kdb_trap_printk;
+        kdb_trap_printk = 0;
+
+        /* Serialize kdb_printf if multiple cpus try to write at once.
+         * But if any cpu goes recursive in kdb, just print the output,
+         * even if it is interleaved with any other text.
+         */
+        if (!KDB_STATE(PRINTF_LOCK)) {
+                KDB_STATE_SET(PRINTF_LOCK);
+                spin_lock_irqsave(&kdb_printf_lock, flags);
+                got_printf_lock = 1;
+                atomic_inc(&kdb_event);
+        } else {
+                __acquire(kdb_printf_lock);
+        }
+
+        diag = kdbgetintenv("LINES", &linecount);
+        if (diag || linecount <= 1)
+                linecount = 24;
+
+        diag = kdbgetintenv("LOGGING", &logging);
+        if (diag)
+                logging = 0;
+
+        if (!kdb_grepping_flag || suspend_grep) {
+                /* normally, every vsnprintf starts a new buffer */
+                next_avail = kdb_buffer;
+                size_avail = sizeof(kdb_buffer);
+        }
+        vsnprintf(next_avail, size_avail, fmt, ap);
+
+        /*
+         * If kdb_parse() found that the command was cmd xxx | grep yyy
+         * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
+         *
+         * Accumulate the print data up to a newline before searching it.
+         * (vsnprintf does null-terminate the string that it generates)
+         */
+
+        /* skip the search if prints are temporarily unconditional */
+        if (!suspend_grep && kdb_grepping_flag) {
+                cp = strchr(kdb_buffer, '\n');
+                if (!cp) {
+                        /*
+                         * Special cases that don't end with newlines
+                         * but should be written without one:
+                         *   The "[nn]kdb> " prompt should
+                         *   appear at the front of the buffer.
+                         *
+                         *   The "[nn]more " prompt should also be
+                         *     (MOREPROMPT -> moreprompt)
+                         *   written *   but we print that ourselves,
+                         *   we set the suspend_grep flag to make
+                         *   it unconditional.
+                         *
+                         */
+                        if (next_avail == kdb_buffer) {
+                                /*
+                                 * these should occur after a newline,
+                                 * so they will be at the front of the
+                                 * buffer
+                                 */
+                                cp2 = kdb_buffer;
+                                len = strlen(kdb_prompt_str);
+                                if (!strncmp(cp2, kdb_prompt_str, len)) {
+                                        /*
+                                         * We're about to start a new
+                                         * command, so we can go back
+                                         * to normal mode.
+                                         */
+                                        kdb_grepping_flag = 0;
+                                        goto kdb_printit;
+                                }
+                        }
+                        /* no newline; don't search/write the buffer
+                           until one is there */
+                        len = strlen(kdb_buffer);
+                        next_avail = kdb_buffer + len;
+                        size_avail = sizeof(kdb_buffer) - len;
+                        goto kdb_print_out;
+                }
+
+                /*
+                 * The newline is present; print through it or discard
+                 * it, depending on the results of the search.
+                 */
+                cp++;                /* to byte after the newline */
+                replaced_byte = *cp; /* remember what/where it was */
+                cphold = cp;
+                *cp = '\0';          /* end the string for our search */
+
+                /*
+                 * We now have a newline at the end of the string
+                 * Only continue with this output if it contains the
+                 * search string.
+                 */
+                fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
+                if (!fnd) {
+                        /*
+                         * At this point the complete line at the start
+                         * of kdb_buffer can be discarded, as it does
+                         * not contain what the user is looking for.
+                         * Shift the buffer left.
+                         */
+                        *cphold = replaced_byte;
+                        strcpy(kdb_buffer, cphold);
+                        len = strlen(kdb_buffer);
+                        next_avail = kdb_buffer + len;
+                        size_avail = sizeof(kdb_buffer) - len;
+                        goto kdb_print_out;
+                }
+                /*
+                 * at this point the string is a full line and
+                 * should be printed, up to the null.
+                 */
+        }
+kdb_printit:
+
+        /*
+         * Write to all consoles.
+         */
+        retlen = strlen(kdb_buffer);
+        if (!dbg_kdb_mode && kgdb_connected) {
+                gdbstub_msg_write(kdb_buffer, retlen);
+        } else {
+                if (!dbg_io_ops->is_console) {
+                        len = strlen(kdb_buffer);
+                        cp = kdb_buffer;
+                        while (len--) {
+                                dbg_io_ops->write_char(*cp);
+                                cp++;
+                        }
+                }
+                while (c) {
+                        c->write(c, kdb_buffer, retlen);
+                        touch_nmi_watchdog();
+                        c = c->next;
+                }
+        }
+        if (logging) {
+                saved_loglevel = console_loglevel;
+                console_loglevel = 0;
+                printk(KERN_INFO "%s", kdb_buffer);
+        }
+
+        if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
+                kdb_nextline++;
+
+        /* check for having reached the LINES number of printed lines */
+        if (kdb_nextline == linecount) {
+                char buf1[16] = "";
+#if defined(CONFIG_SMP)
+                char buf2[32];
+#endif
+
+                /* Watch out for recursion here.  Any routine that calls
+                 * kdb_printf will come back through here.  And kdb_read
+                 * uses kdb_printf to echo on serial consoles ...
+                 */
+                kdb_nextline = 1;       /* In case of recursion */
+
+                /*
+                 * Pause until cr.
+                 */
+                moreprompt = kdbgetenv("MOREPROMPT");
+                if (moreprompt == NULL)
+                        moreprompt = "more> ";
+
+#if defined(CONFIG_SMP)
+                if (strchr(moreprompt, '%')) {
+                        sprintf(buf2, moreprompt, get_cpu());
+                        put_cpu();
+                        moreprompt = buf2;
+                }
+#endif
+
+                kdb_input_flush();
+                c = console_drivers;
+
+                if (!dbg_io_ops->is_console) {
+                        len = strlen(moreprompt);
+                        cp = moreprompt;
+                        while (len--) {
+                                dbg_io_ops->write_char(*cp);
+                                cp++;
+                        }
+                }
+                while (c) {
+                        c->write(c, moreprompt, strlen(moreprompt));
+                        touch_nmi_watchdog();
+                        c = c->next;
+                }
+
+                if (logging)
+                        printk("%s", moreprompt);
+
+                kdb_read(buf1, 2); /* '2' indicates to return
+                                    * immediately after getting one key. */
+                kdb_nextline = 1;       /* Really set output line 1 */
+
+                /* empty and reset the buffer: */
+                kdb_buffer[0] = '\0';
+                next_avail = kdb_buffer;
+                size_avail = sizeof(kdb_buffer);
+                if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
+                        /* user hit q or Q */
+                        KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
+                        KDB_STATE_CLEAR(PAGER);
+                        /* end of command output; back to normal mode */
+                        kdb_grepping_flag = 0;
+                        kdb_printf("\n");
+                } else if (buf1[0] == ' ') {
+                        kdb_printf("\n");
+                        suspend_grep = 1; /* for this recursion */
+                } else if (buf1[0] == '\n') {
+                        kdb_nextline = linecount - 1;
+                        kdb_printf("\r");
+                        suspend_grep = 1; /* for this recursion */
+                } else if (buf1[0] && buf1[0] != '\n') {
+                        /* user hit something other than enter */
+                        suspend_grep = 1; /* for this recursion */
+                        kdb_printf("\nOnly 'q' or 'Q' are processed at more "
+                                   "prompt, input ignored\n");
+                } else if (kdb_grepping_flag) {
+                        /* user hit enter */
+                        suspend_grep = 1; /* for this recursion */
+                        kdb_printf("\n");
+                }
+                kdb_input_flush();
+        }
+
+        /*
+         * For grep searches, shift the printed string left.
+         *  replaced_byte contains the character that was overwritten with
+         *  the terminating null, and cphold points to the null.
+         * Then adjust the notion of available space in the buffer.
+         */
+        if (kdb_grepping_flag && !suspend_grep) {
+                *cphold = replaced_byte;
+                strcpy(kdb_buffer, cphold);
+                len = strlen(kdb_buffer);
+                next_avail = kdb_buffer + len;
+                size_avail = sizeof(kdb_buffer) - len;
+        }
+
+kdb_print_out:
+        suspend_grep = 0; /* end of what may have been a recursive call */
+        if (logging)
+                console_loglevel = saved_loglevel;
+        if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
+                got_printf_lock = 0;
+                spin_unlock_irqrestore(&kdb_printf_lock, flags);
+                KDB_STATE_CLEAR(PRINTF_LOCK);
+                atomic_dec(&kdb_event);
+        } else {
+                __release(kdb_printf_lock);
+        }
+        kdb_trap_printk = saved_trap_printk;
+        preempt_enable();
+        return retlen;
+}
+
+int kdb_printf(const char *fmt, ...)
+{
+        va_list ap;
+        int r;
+
+        va_start(ap, fmt);
+        r = vkdb_printf(fmt, ap);
+        va_end(ap);
+
+        return r;
+}
+
diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
new file mode 100644
index 000000000000..4bca634975c0
--- /dev/null
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -0,0 +1,212 @@
+/*
+ * Kernel Debugger Architecture Dependent Console I/O handler
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.
+ *
+ * Copyright (c) 1999-2006 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ */
+
+#include <linux/kdb.h>
+#include <linux/keyboard.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+/* Keyboard Controller Registers on normal PCs. */
+
+#define KBD_STATUS_REG          0x64    /* Status register (R) */
+#define KBD_DATA_REG            0x60    /* Keyboard data register (R/W) */
+
+/* Status Register Bits */
+
+#define KBD_STAT_OBF            0x01    /* Keyboard output buffer full */
+#define KBD_STAT_MOUSE_OBF      0x20    /* Mouse output buffer full */
+
+static int kbd_exists;
+
+/*
+ * Check if the keyboard controller has a keypress for us.
+ * Some parts (Enter Release, LED change) are still blocking polled here,
+ * but hopefully they are all short.
+ */
+int kdb_get_kbd_char(void)
+{
+        int scancode, scanstatus;
+        static int shift_lock;  /* CAPS LOCK state (0-off, 1-on) */
+        static int shift_key;   /* Shift next keypress */
+        static int ctrl_key;
+        u_short keychar;
+
+        if (KDB_FLAG(NO_I8042) || KDB_FLAG(NO_VT_CONSOLE) ||
+            (inb(KBD_STATUS_REG) == 0xff && inb(KBD_DATA_REG) == 0xff)) {
+                kbd_exists = 0;
+                return -1;
+        }
+        kbd_exists = 1;
+
+        if ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
+                return -1;
+
+        /*
+         * Fetch the scancode
+         */
+        scancode = inb(KBD_DATA_REG);
+        scanstatus = inb(KBD_STATUS_REG);
+
+        /*
+         * Ignore mouse events.
+         */
+        if (scanstatus & KBD_STAT_MOUSE_OBF)
+                return -1;
+
+        /*
+         * Ignore release, trigger on make
+         * (except for shift keys, where we want to
+         *  keep the shift state so long as the key is
+         *  held down).
+         */
+
+        if (((scancode&0x7f) == 0x2a) || ((scancode&0x7f) == 0x36)) {
+                /*
+                 * Next key may use shift table
+                 */
+                if ((scancode & 0x80) == 0)
+                        shift_key = 1;
+                else
+                        shift_key = 0;
+                return -1;
+        }
+
+        if ((scancode&0x7f) == 0x1d) {
+                /*
+                 * Left ctrl key
+                 */
+                if ((scancode & 0x80) == 0)
+                        ctrl_key = 1;
+                else
+                        ctrl_key = 0;
+                return -1;
+        }
+
+        if ((scancode & 0x80) != 0)
+                return -1;
+
+        scancode &= 0x7f;
+
+        /*
+         * Translate scancode
+         */
+
+        if (scancode == 0x3a) {
+                /*
+                 * Toggle caps lock
+                 */
+                shift_lock ^= 1;
+
+#ifdef  KDB_BLINK_LED
+                kdb_toggleled(0x4);
+#endif
+                return -1;
+        }
+
+        if (scancode == 0x0e) {
+                /*
+                 * Backspace
+                 */
+                return 8;
+        }
+
+        /* Special Key */
+        switch (scancode) {
+        case 0xF: /* Tab */
+                return 9;
+        case 0x53: /* Del */
+                return 4;
+        case 0x47: /* Home */
+                return 1;
+        case 0x4F: /* End */
+                return 5;
+        case 0x4B: /* Left */
+                return 2;
+        case 0x48: /* Up */
+                return 16;
+        case 0x50: /* Down */
+                return 14;
+        case 0x4D: /* Right */
+                return 6;
+        }
+
+        if (scancode == 0xe0)
+                return -1;
+
+        /*
+         * For Japanese 86/106 keyboards
+         *      See comment in drivers/char/pc_keyb.c.
+         *      - Masahiro Adegawa
+         */
+        if (scancode == 0x73)
+                scancode = 0x59;
+        else if (scancode == 0x7d)
+                scancode = 0x7c;
+
+        if (!shift_lock && !shift_key && !ctrl_key) {
+                keychar = plain_map[scancode];
+        } else if ((shift_lock || shift_key) && key_maps[1]) {
+                keychar = key_maps[1][scancode];
+        } else if (ctrl_key && key_maps[4]) {
+                keychar = key_maps[4][scancode];
+        } else {
+                keychar = 0x0020;
+                kdb_printf("Unknown state/scancode (%d)\n", scancode);
+        }
+        keychar &= 0x0fff;
+        if (keychar == '\t')
+                keychar = ' ';
+        switch (KTYP(keychar)) {
+        case KT_LETTER:
+        case KT_LATIN:
+                if (isprint(keychar))
+                        break;          /* printable characters */
+                /* drop through */
+        case KT_SPEC:
+                if (keychar == K_ENTER)
+                        break;
+                /* drop through */
+        default:
+                return -1;      /* ignore unprintables */
+        }
+
+        if ((scancode & 0x7f) == 0x1c) {
+                /*
+                 * enter key.  All done.  Absorb the release scancode.
+                 */
+                while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
+                        ;
+
+                /*
+                 * Fetch the scancode
+                 */
+                scancode = inb(KBD_DATA_REG);
+                scanstatus = inb(KBD_STATUS_REG);
+
+                while (scanstatus & KBD_STAT_MOUSE_OBF) {
+                        scancode = inb(KBD_DATA_REG);
+                        scanstatus = inb(KBD_STATUS_REG);
+                }
+
+                if (scancode != 0x9c) {
+                        /*
+                         * Wasn't an enter-release,  why not?
+                         */
+                        kdb_printf("kdb: expected enter got 0x%x status 0x%x\n",
+                               scancode, scanstatus);
+                }
+
+                return 13;
+        }
+
+        return keychar & 0xff;
+}
+EXPORT_SYMBOL_GPL(kdb_get_kbd_char);
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
new file mode 100644
index 000000000000..b724c791b6d4
--- /dev/null
+++ b/kernel/debug/kdb/kdb_main.c
@@ -0,0 +1,2849 @@
+/*
+ * Kernel Debugger Architecture Independent Main Code
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
+ * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/sysrq.h>
+#include <linux/smp.h>
+#include <linux/utsname.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/kallsyms.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/notifier.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/nmi.h>
+#include <linux/time.h>
+#include <linux/ptrace.h>
+#include <linux/sysctl.h>
+#include <linux/cpu.h>
+#include <linux/kdebug.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include "kdb_private.h"
+
+#define GREP_LEN 256
+char kdb_grep_string[GREP_LEN];
+int kdb_grepping_flag;
+EXPORT_SYMBOL(kdb_grepping_flag);
+int kdb_grep_leading;
+int kdb_grep_trailing;
+
+/*
+ * Kernel debugger state flags
+ */
+int kdb_flags;
+atomic_t kdb_event;
+
+/*
+ * kdb_lock protects updates to kdb_initial_cpu.  Used to
+ * single thread processors through the kernel debugger.
+ */
+int kdb_initial_cpu = -1;       /* cpu number that owns kdb */
+int kdb_nextline = 1;
+int kdb_state;                  /* General KDB state */
+
+struct task_struct *kdb_current_task;
+EXPORT_SYMBOL(kdb_current_task);
+struct pt_regs *kdb_current_regs;
+
+const char *kdb_diemsg;
+static int kdb_go_count;
+#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
+static unsigned int kdb_continue_catastrophic =
+        CONFIG_KDB_CONTINUE_CATASTROPHIC;
+#else
+static unsigned int kdb_continue_catastrophic;
+#endif
+
+/* kdb_commands describes the available commands. */
+static kdbtab_t *kdb_commands;
+#define KDB_BASE_CMD_MAX 50
+static int kdb_max_commands = KDB_BASE_CMD_MAX;
+static kdbtab_t kdb_base_commands[50];
+#define for_each_kdbcmd(cmd, num)                                       \
+        for ((cmd) = kdb_base_commands, (num) = 0;                      \
+             num < kdb_max_commands;                                    \
+             num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++, num++)
+
+typedef struct _kdbmsg {
+        int     km_diag;        /* kdb diagnostic */
+        char    *km_msg;        /* Corresponding message text */
+} kdbmsg_t;
+
+#define KDBMSG(msgnum, text) \
+        { KDB_##msgnum, text }
+
+static kdbmsg_t kdbmsgs[] = {
+        KDBMSG(NOTFOUND, "Command Not Found"),
+        KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
+        KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
+               "8 is only allowed on 64 bit systems"),
+        KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
+        KDBMSG(NOTENV, "Cannot find environment variable"),
+        KDBMSG(NOENVVALUE, "Environment variable should have value"),
+        KDBMSG(NOTIMP, "Command not implemented"),
+        KDBMSG(ENVFULL, "Environment full"),
+        KDBMSG(ENVBUFFULL, "Environment buffer full"),
+        KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
+#ifdef CONFIG_CPU_XSCALE
+        KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
+#else
+        KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
+#endif
+        KDBMSG(DUPBPT, "Duplicate breakpoint address"),
+        KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
+        KDBMSG(BADMODE, "Invalid IDMODE"),
+        KDBMSG(BADINT, "Illegal numeric value"),
+        KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
+        KDBMSG(BADREG, "Invalid register name"),
+        KDBMSG(BADCPUNUM, "Invalid cpu number"),
+        KDBMSG(BADLENGTH, "Invalid length field"),
+        KDBMSG(NOBP, "No Breakpoint exists"),
+        KDBMSG(BADADDR, "Invalid address"),
+};
+#undef KDBMSG
+
+static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
+
+
+/*
+ * Initial environment.   This is all kept static and local to
+ * this file.   We don't want to rely on the memory allocation
+ * mechanisms in the kernel, so we use a very limited allocate-only
+ * heap for new and altered environment variables.  The entire
+ * environment is limited to a fixed number of entries (add more
+ * to __env[] if required) and a fixed amount of heap (add more to
+ * KDB_ENVBUFSIZE if required).
+ */
+
+static char *__env[] = {
+#if defined(CONFIG_SMP)
+ "PROMPT=[%d]kdb> ",
+ "MOREPROMPT=[%d]more> ",
+#else
+ "PROMPT=kdb> ",
+ "MOREPROMPT=more> ",
+#endif
+ "RADIX=16",
+ "MDCOUNT=8",                   /* lines of md output */
+ "BTARGS=9",                    /* 9 possible args in bt */
+ KDB_PLATFORM_ENV,
+ "DTABCOUNT=30",
+ "NOSECT=1",
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+};
+
+static const int __nenv = (sizeof(__env) / sizeof(char *));
+
+struct task_struct *kdb_curr_task(int cpu)
+{
+        struct task_struct *p = curr_task(cpu);
+#ifdef  _TIF_MCA_INIT
+        if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
+                p = krp->p;
+#endif
+        return p;
+}
+
+/*
+ * kdbgetenv - This function will return the character string value of
+ *      an environment variable.
+ * Parameters:
+ *      match   A character string representing an environment variable.
+ * Returns:
+ *      NULL    No environment variable matches 'match'
+ *      char*   Pointer to string value of environment variable.
+ */
+char *kdbgetenv(const char *match)
+{
+        char **ep = __env;
+        int matchlen = strlen(match);
+        int i;
+
+        for (i = 0; i < __nenv; i++) {
+                char *e = *ep++;
+
+                if (!e)
+                        continue;
+
+                if ((strncmp(match, e, matchlen) == 0)
+                 && ((e[matchlen] == '\0')
+                   || (e[matchlen] == '='))) {
+                        char *cp = strchr(e, '=');
+                        return cp ? ++cp : "";
+                }
+        }
+        return NULL;
+}
+
+/*
+ * kdballocenv - This function is used to allocate bytes for
+ *      environment entries.
+ * Parameters:
+ *      match   A character string representing a numeric value
+ * Outputs:
+ *      *value  the unsigned long representation of the env variable 'match'
+ * Returns:
+ *      Zero on success, a kdb diagnostic on failure.
+ * Remarks:
+ *      We use a static environment buffer (envbuffer) to hold the values
+ *      of dynamically generated environment variables (see kdb_set).  Buffer
+ *      space once allocated is never free'd, so over time, the amount of space
+ *      (currently 512 bytes) will be exhausted if env variables are changed
+ *      frequently.
+ */
+static char *kdballocenv(size_t bytes)
+{
+#define KDB_ENVBUFSIZE  512
+        static char envbuffer[KDB_ENVBUFSIZE];
+        static int envbufsize;
+        char *ep = NULL;
+
+        if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
+                ep = &envbuffer[envbufsize];
+                envbufsize += bytes;
+        }
+        return ep;
+}
+
+/*
+ * kdbgetulenv - This function will return the value of an unsigned
+ *      long-valued environment variable.
+ * Parameters:
+ *      match   A character string representing a numeric value
+ * Outputs:
+ *      *value  the unsigned long represntation of the env variable 'match'
+ * Returns:
+ *      Zero on success, a kdb diagnostic on failure.
+ */
+static int kdbgetulenv(const char *match, unsigned long *value)
+{
+        char *ep;
+
+        ep = kdbgetenv(match);
+        if (!ep)
+                return KDB_NOTENV;
+        if (strlen(ep) == 0)
+                return KDB_NOENVVALUE;
+
+        *value = simple_strtoul(ep, NULL, 0);
+
+        return 0;
+}
+
+/*
+ * kdbgetintenv - This function will return the value of an
+ *      integer-valued environment variable.
+ * Parameters:
+ *      match   A character string representing an integer-valued env variable
+ * Outputs:
+ *      *value  the integer representation of the environment variable 'match'
+ * Returns:
+ *      Zero on success, a kdb diagnostic on failure.
+ */
+int kdbgetintenv(const char *match, int *value)
+{
+        unsigned long val;
+        int diag;
+
+        diag = kdbgetulenv(match, &val);
+        if (!diag)
+                *value = (int) val;
+        return diag;
+}
+
+/*
+ * kdbgetularg - This function will convert a numeric string into an
+ *      unsigned long value.
+ * Parameters:
+ *      arg     A character string representing a numeric value
+ * Outputs:
+ *      *value  the unsigned long represntation of arg.
+ * Returns:
+ *      Zero on success, a kdb diagnostic on failure.
+ */
+int kdbgetularg(const char *arg, unsigned long *value)
+{
+        char *endp;
+        unsigned long val;
+
+        val = simple_strtoul(arg, &endp, 0);
+
+        if (endp == arg) {
+                /*
+                 * Try base 16, for us folks too lazy to type the
+                 * leading 0x...
+                 */
+                val = simple_strtoul(arg, &endp, 16);
+                if (endp == arg)
+                        return KDB_BADINT;
+        }
+
+        *value = val;
+
+        return 0;
+}
+
+/*
+ * kdb_set - This function implements the 'set' command.  Alter an
+ *      existing environment variable or create a new one.
+ */
+int kdb_set(int argc, const char **argv)
+{
+        int i;
+        char *ep;
+        size_t varlen, vallen;
+
+        /*
+         * we can be invoked two ways:
+         *   set var=value    argv[1]="var", argv[2]="value"
+         *   set var = value  argv[1]="var", argv[2]="=", argv[3]="value"
+         * - if the latter, shift 'em down.
+         */
+        if (argc == 3) {
+                argv[2] = argv[3];
+                argc--;
+        }
+
+        if (argc != 2)
+                return KDB_ARGCOUNT;
+
+        /*
+         * Check for internal variables
+         */
+        if (strcmp(argv[1], "KDBDEBUG") == 0) {
+                unsigned int debugflags;
+                char *cp;
+
+                debugflags = simple_strtoul(argv[2], &cp, 0);
+                if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
+                        kdb_printf("kdb: illegal debug flags '%s'\n",
+                                    argv[2]);
+                        return 0;
+                }
+                kdb_flags = (kdb_flags &
+                             ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
+                        | (debugflags << KDB_DEBUG_FLAG_SHIFT);
+
+                return 0;
+        }
+
+        /*
+         * Tokenizer squashed the '=' sign.  argv[1] is variable
+         * name, argv[2] = value.
+         */
+        varlen = strlen(argv[1]);
+        vallen = strlen(argv[2]);
+        ep = kdballocenv(varlen + vallen + 2);
+        if (ep == (char *)0)
+                return KDB_ENVBUFFULL;
+
+        sprintf(ep, "%s=%s", argv[1], argv[2]);
+
+        ep[varlen+vallen+1] = '\0';
+
+        for (i = 0; i < __nenv; i++) {
+                if (__env[i]
+                 && ((strncmp(__env[i], argv[1], varlen) == 0)
+                   && ((__env[i][varlen] == '\0')
+                    || (__env[i][varlen] == '=')))) {
+                        __env[i] = ep;
+                        return 0;
+                }
+        }
+
+        /*
+         * Wasn't existing variable.  Fit into slot.
+         */
+        for (i = 0; i < __nenv-1; i++) {
+                if (__env[i] == (char *)0) {
+                        __env[i] = ep;
+                        return 0;
+                }
+        }
+
+        return KDB_ENVFULL;
+}
+
+static int kdb_check_regs(void)
+{
+        if (!kdb_current_regs) {
+                kdb_printf("No current kdb registers."
+                           "  You may need to select another task\n");
+                return KDB_BADREG;
+        }
+        return 0;
+}
+
+/*
+ * kdbgetaddrarg - This function is responsible for parsing an
+ *      address-expression and returning the value of the expression,
+ *      symbol name, and offset to the caller.
+ *
+ *      The argument may consist of a numeric value (decimal or
+ *      hexidecimal), a symbol name, a register name (preceeded by the
+ *      percent sign), an environment variable with a numeric value
+ *      (preceeded by a dollar sign) or a simple arithmetic expression
+ *      consisting of a symbol name, +/-, and a numeric constant value
+ *      (offset).
+ * Parameters:
+ *      argc    - count of arguments in argv
+ *      argv    - argument vector
+ *      *nextarg - index to next unparsed argument in argv[]
+ *      regs    - Register state at time of KDB entry
+ * Outputs:
+ *      *value  - receives the value of the address-expression
+ *      *offset - receives the offset specified, if any
+ *      *name   - receives the symbol name, if any
+ *      *nextarg - index to next unparsed argument in argv[]
+ * Returns:
+ *      zero is returned on success, a kdb diagnostic code is
+ *      returned on error.
+ */
+int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
+                  unsigned long *value,  long *offset,
+                  char **name)
+{
+        unsigned long addr;
+        unsigned long off = 0;
+        int positive;
+        int diag;
+        int found = 0;
+        char *symname;
+        char symbol = '\0';
+        char *cp;
+        kdb_symtab_t symtab;
+
+        /*
+         * Process arguments which follow the following syntax:
+         *
+         *  symbol | numeric-address [+/- numeric-offset]
+         *  %register
+         *  $environment-variable
+         */
+
+        if (*nextarg > argc)
+                return KDB_ARGCOUNT;
+
+        symname = (char *)argv[*nextarg];
+
+        /*
+         * If there is no whitespace between the symbol
+         * or address and the '+' or '-' symbols, we
+         * remember the character and replace it with a
+         * null so the symbol/value can be properly parsed
+         */
+        cp = strpbrk(symname, "+-");
+        if (cp != NULL) {
+                symbol = *cp;
+                *cp++ = '\0';
+        }
+
+        if (symname[0] == '$') {
+                diag = kdbgetulenv(&symname[1], &addr);
+                if (diag)
+                        return diag;
+        } else if (symname[0] == '%') {
+                diag = kdb_check_regs();
+                if (diag)
+                        return diag;
+                /* Implement register values with % at a later time as it is
+                 * arch optional.
+                 */
+                return KDB_NOTIMP;
+        } else {
+                found = kdbgetsymval(symname, &symtab);
+                if (found) {
+                        addr = symtab.sym_start;
+                } else {
+                        diag = kdbgetularg(argv[*nextarg], &addr);
+                        if (diag)
+                                return diag;
+                }
+        }
+
+        if (!found)
+                found = kdbnearsym(addr, &symtab);
+
+        (*nextarg)++;
+
+        if (name)
+                *name = symname;
+        if (value)
+                *value = addr;
+        if (offset && name && *name)
+                *offset = addr - symtab.sym_start;
+
+        if ((*nextarg > argc)
+         && (symbol == '\0'))
+                return 0;
+
+        /*
+         * check for +/- and offset
+         */
+
+        if (symbol == '\0') {
+                if ((argv[*nextarg][0] != '+')
+                 && (argv[*nextarg][0] != '-')) {
+                        /*
+                         * Not our argument.  Return.
+                         */
+                        return 0;
+                } else {
+                        positive = (argv[*nextarg][0] == '+');
+                        (*nextarg)++;
+                }
+        } else
+                positive = (symbol == '+');
+
+        /*
+         * Now there must be an offset!
+         */
+        if ((*nextarg > argc)
+         && (symbol == '\0')) {
+                return KDB_INVADDRFMT;
+        }
+
+        if (!symbol) {
+                cp = (char *)argv[*nextarg];
+                (*nextarg)++;
+        }
+
+        diag = kdbgetularg(cp, &off);
+        if (diag)
+                return diag;
+
+        if (!positive)
+                off = -off;
+
+        if (offset)
+                *offset += off;
+
+        if (value)
+                *value += off;
+
+        return 0;
+}
+
+static void kdb_cmderror(int diag)
+{
+        int i;
+
+        if (diag >= 0) {
+                kdb_printf("no error detected (diagnostic is %d)\n", diag);
+                return;
+        }
+
+        for (i = 0; i < __nkdb_err; i++) {
+                if (kdbmsgs[i].km_diag == diag) {
+                        kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
+                        return;
+                }
+        }
+
+        kdb_printf("Unknown diag %d\n", -diag);
+}
+
+/*
+ * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
+ *      command which defines one command as a set of other commands,
+ *      terminated by endefcmd.  kdb_defcmd processes the initial
+ *      'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
+ *      the following commands until 'endefcmd'.
+ * Inputs:
+ *      argc    argument count
+ *      argv    argument vector
+ * Returns:
+ *      zero for success, a kdb diagnostic if error
+ */
+struct defcmd_set {
+        int count;
+        int usable;
+        char *name;
+        char *usage;
+        char *help;
+        char **command;
+};
+static struct defcmd_set *defcmd_set;
+static int defcmd_set_count;
+static int defcmd_in_progress;
+
+/* Forward references */
+static int kdb_exec_defcmd(int argc, const char **argv);
+
+static int kdb_defcmd2(const char *cmdstr, const char *argv0)
+{
+        struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
+        char **save_command = s->command;
+        if (strcmp(argv0, "endefcmd") == 0) {
+                defcmd_in_progress = 0;
+                if (!s->count)
+                        s->usable = 0;
+                if (s->usable)
+                        kdb_register(s->name, kdb_exec_defcmd,
+                                     s->usage, s->help, 0);
+                return 0;
+        }
+        if (!s->usable)
+                return KDB_NOTIMP;
+        s->command = kmalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
+        if (!s->command) {
+                kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
+                           cmdstr);
+                s->usable = 0;
+                return KDB_NOTIMP;
+        }
+        memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
+        s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
+        kfree(save_command);
+        return 0;
+}
+
+static int kdb_defcmd(int argc, const char **argv)
+{
+        struct defcmd_set *save_defcmd_set = defcmd_set, *s;
+        if (defcmd_in_progress) {
+                kdb_printf("kdb: nested defcmd detected, assuming missing "
+                           "endefcmd\n");
+                kdb_defcmd2("endefcmd", "endefcmd");
+        }
+        if (argc == 0) {
+                int i;
+                for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
+                        kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
+                                   s->usage, s->help);
+                        for (i = 0; i < s->count; ++i)
+                                kdb_printf("%s", s->command[i]);
+                        kdb_printf("endefcmd\n");
+                }
+                return 0;
+        }
+        if (argc != 3)
+                return KDB_ARGCOUNT;
+        defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
+                             GFP_KDB);
+        if (!defcmd_set) {
+                kdb_printf("Could not allocate new defcmd_set entry for %s\n",
+                           argv[1]);
+                defcmd_set = save_defcmd_set;
+                return KDB_NOTIMP;
+        }
+        memcpy(defcmd_set, save_defcmd_set,
+               defcmd_set_count * sizeof(*defcmd_set));
+        kfree(save_defcmd_set);
+        s = defcmd_set + defcmd_set_count;
+        memset(s, 0, sizeof(*s));
+        s->usable = 1;
+        s->name = kdb_strdup(argv[1], GFP_KDB);
+        s->usage = kdb_strdup(argv[2], GFP_KDB);
+        s->help = kdb_strdup(argv[3], GFP_KDB);
+        if (s->usage[0] == '"') {
+                strcpy(s->usage, s->usage+1);
+                s->usage[strlen(s->usage)-1] = '\0';
+        }
+        if (s->help[0] == '"') {
+                strcpy(s->help, s->help+1);
+                s->help[strlen(s->help)-1] = '\0';
+        }
+        ++defcmd_set_count;
+        defcmd_in_progress = 1;
+        return 0;
+}
+
+/*
+ * kdb_exec_defcmd - Execute the set of commands associated with this
+ *      defcmd name.
+ * Inputs:
+ *      argc    argument count
+ *      argv    argument vector
+ * Returns:
+ *      zero for success, a kdb diagnostic if error
+ */
+static int kdb_exec_defcmd(int argc, const char **argv)
+{
+        int i, ret;
+        struct defcmd_set *s;
+        if (argc != 0)
+                return KDB_ARGCOUNT;
+        for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
+                if (strcmp(s->name, argv[0]) == 0)
+                        break;
+        }
+        if (i == defcmd_set_count) {
+                kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
+                           argv[0]);
+                return KDB_NOTIMP;
+        }
+        for (i = 0; i < s->count; ++i) {
+                /* Recursive use of kdb_parse, do not use argv after
+                 * this point */
+                argv = NULL;
+                kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
+                ret = kdb_parse(s->command[i]);
+                if (ret)
+                        return ret;
+        }
+        return 0;
+}
+
+/* Command history */
+#define KDB_CMD_HISTORY_COUNT   32
+#define CMD_BUFLEN              200     /* kdb_printf: max printline
+                                         * size == 256 */
+static unsigned int cmd_head, cmd_tail;
+static unsigned int cmdptr;
+static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
+static char cmd_cur[CMD_BUFLEN];
+
+/*
+ * The "str" argument may point to something like  | grep xyz
+ */
+static void parse_grep(const char *str)
+{
+        int     len;
+        char    *cp = (char *)str, *cp2;
+
+        /* sanity check: we should have been called with the \ first */
+        if (*cp != '|')
+                return;
+        cp++;
+        while (isspace(*cp))
+                cp++;
+        if (strncmp(cp, "grep ", 5)) {
+                kdb_printf("invalid 'pipe', see grephelp\n");
+                return;
+        }
+        cp += 5;
+        while (isspace(*cp))
+                cp++;
+        cp2 = strchr(cp, '\n');
+        if (cp2)
+                *cp2 = '\0'; /* remove the trailing newline */
+        len = strlen(cp);
+        if (len == 0) {
+                kdb_printf("invalid 'pipe', see grephelp\n");
+                return;
+        }
+        /* now cp points to a nonzero length search string */
+        if (*cp == '"') {
+                /* allow it be "x y z" by removing the "'s - there must
+                   be two of them */
+                cp++;
+                cp2 = strchr(cp, '"');
+                if (!cp2) {
+                        kdb_printf("invalid quoted string, see grephelp\n");
+                        return;
+                }
+                *cp2 = '\0'; /* end the string where the 2nd " was */
+        }
+        kdb_grep_leading = 0;
+        if (*cp == '^') {
+                kdb_grep_leading = 1;
+                cp++;
+        }
+        len = strlen(cp);
+        kdb_grep_trailing = 0;
+        if (*(cp+len-1) == '$') {
+                kdb_grep_trailing = 1;
+                *(cp+len-1) = '\0';
+        }
+        len = strlen(cp);
+        if (!len)
+                return;
+        if (len >= GREP_LEN) {
+                kdb_printf("search string too long\n");
+                return;
+        }
+        strcpy(kdb_grep_string, cp);
+        kdb_grepping_flag++;
+        return;
+}
+
+/*
+ * kdb_parse - Parse the command line, search the command table for a
+ *      matching command and invoke the command function.  This
+ *      function may be called recursively, if it is, the second call
+ *      will overwrite argv and cbuf.  It is the caller's
+ *      responsibility to save their argv if they recursively call
+ *      kdb_parse().
+ * Parameters:
+ *      cmdstr  The input command line to be parsed.
+ *      regs    The registers at the time kdb was entered.
+ * Returns:
+ *      Zero for success, a kdb diagnostic if failure.
+ * Remarks:
+ *      Limited to 20 tokens.
+ *
+ *      Real rudimentary tokenization. Basically only whitespace
+ *      is considered a token delimeter (but special consideration
+ *      is taken of the '=' sign as used by the 'set' command).
+ *
+ *      The algorithm used to tokenize the input string relies on
+ *      there being at least one whitespace (or otherwise useless)
+ *      character between tokens as the character immediately following
+ *      the token is altered in-place to a null-byte to terminate the
+ *      token string.
+ */
+
+#define MAXARGC 20
+
+int kdb_parse(const char *cmdstr)
+{
+        static char *argv[MAXARGC];
+        static int argc;
+        static char cbuf[CMD_BUFLEN+2];
+        char *cp;
+        char *cpp, quoted;
+        kdbtab_t *tp;
+        int i, escaped, ignore_errors = 0, check_grep;
+
+        /*
+         * First tokenize the command string.
+         */
+        cp = (char *)cmdstr;
+        kdb_grepping_flag = check_grep = 0;
+
+        if (KDB_FLAG(CMD_INTERRUPT)) {
+                /* Previous command was interrupted, newline must not
+                 * repeat the command */
+                KDB_FLAG_CLEAR(CMD_INTERRUPT);
+                KDB_STATE_SET(PAGER);
+                argc = 0;       /* no repeat */
+        }
+
+        if (*cp != '\n' && *cp != '\0') {
+                argc = 0;
+                cpp = cbuf;
+                while (*cp) {
+                        /* skip whitespace */
+                        while (isspace(*cp))
+                                cp++;
+                        if ((*cp == '\0') || (*cp == '\n') ||
+                            (*cp == '#' && !defcmd_in_progress))
+                                break;
+                        /* special case: check for | grep pattern */
+                        if (*cp == '|') {
+                                check_grep++;
+                                break;
+                        }
+                        if (cpp >= cbuf + CMD_BUFLEN) {
+                                kdb_printf("kdb_parse: command buffer "
+                                           "overflow, command ignored\n%s\n",
+                                           cmdstr);
+                                return KDB_NOTFOUND;
+                        }
+                        if (argc >= MAXARGC - 1) {
+                                kdb_printf("kdb_parse: too many arguments, "
+                                           "command ignored\n%s\n", cmdstr);
+                                return KDB_NOTFOUND;
+                        }
+                        argv[argc++] = cpp;
+                        escaped = 0;
+                        quoted = '\0';
+                        /* Copy to next unquoted and unescaped
+                         * whitespace or '=' */
+                        while (*cp && *cp != '\n' &&
+                               (escaped || quoted || !isspace(*cp))) {
+                                if (cpp >= cbuf + CMD_BUFLEN)
+                                        break;
+                                if (escaped) {
+                                        escaped = 0;
+                                        *cpp++ = *cp++;
+                                        continue;
+                                }
+                                if (*cp == '\\') {
+                                        escaped = 1;
+                                        ++cp;
+                                        continue;
+                                }
+                                if (*cp == quoted)
+                                        quoted = '\0';
+                                else if (*cp == '\'' || *cp == '"')
+                                        quoted = *cp;
+                                *cpp = *cp++;
+                                if (*cpp == '=' && !quoted)
+                                        break;
+                                ++cpp;
+                        }
+                        *cpp++ = '\0';  /* Squash a ws or '=' character */
+                }
+        }
+        if (!argc)
+                return 0;
+        if (check_grep)
+                parse_grep(cp);
+        if (defcmd_in_progress) {
+                int result = kdb_defcmd2(cmdstr, argv[0]);
+                if (!defcmd_in_progress) {
+                        argc = 0;       /* avoid repeat on endefcmd */
+                        *(argv[0]) = '\0';
+                }
+                return result;
+        }
+        if (argv[0][0] == '-' && argv[0][1] &&
+            (argv[0][1] < '0' || argv[0][1] > '9')) {
+                ignore_errors = 1;
+                ++argv[0];
+        }
+
+        for_each_kdbcmd(tp, i) {
+                if (tp->cmd_name) {
+                        /*
+                         * If this command is allowed to be abbreviated,
+                         * check to see if this is it.
+                         */
+
+                        if (tp->cmd_minlen
+                         && (strlen(argv[0]) <= tp->cmd_minlen)) {
+                                if (strncmp(argv[0],
+                                            tp->cmd_name,
+                                            tp->cmd_minlen) == 0) {
+                                        break;
+                                }
+                        }
+
+                        if (strcmp(argv[0], tp->cmd_name) == 0)
+                                break;
+                }
+        }
+
+        /*
+         * If we don't find a command by this name, see if the first
+         * few characters of this match any of the known commands.
+         * e.g., md1c20 should match md.
+         */
+        if (i == kdb_max_commands) {
+                for_each_kdbcmd(tp, i) {
+                        if (tp->cmd_name) {
+                                if (strncmp(argv[0],
+                                            tp->cmd_name,
+                                            strlen(tp->cmd_name)) == 0) {
+                                        break;
+                                }
+                        }
+                }
+        }
+
+        if (i < kdb_max_commands) {
+                int result;
+                KDB_STATE_SET(CMD);
+                result = (*tp->cmd_func)(argc-1, (const char **)argv);
+                if (result && ignore_errors && result > KDB_CMD_GO)
+                        result = 0;
+                KDB_STATE_CLEAR(CMD);
+                switch (tp->cmd_repeat) {
+                case KDB_REPEAT_NONE:
+                        argc = 0;
+                        if (argv[0])
+                                *(argv[0]) = '\0';
+                        break;
+                case KDB_REPEAT_NO_ARGS:
+                        argc = 1;
+                        if (argv[1])
+                                *(argv[1]) = '\0';
+                        break;
+                case KDB_REPEAT_WITH_ARGS:
+                        break;
+                }
+                return result;
+        }
+
+        /*
+         * If the input with which we were presented does not
+         * map to an existing command, attempt to parse it as an
+         * address argument and display the result.   Useful for
+         * obtaining the address of a variable, or the nearest symbol
+         * to an address contained in a register.
+         */
+        {
+                unsigned long value;
+                char *name = NULL;
+                long offset;
+                int nextarg = 0;
+
+                if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
+                                  &value, &offset, &name)) {
+                        return KDB_NOTFOUND;
+                }
+
+                kdb_printf("%s = ", argv[0]);
+                kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
+                kdb_printf("\n");
+                return 0;
+        }
+}
+
+
+static int handle_ctrl_cmd(char *cmd)
+{
+#define CTRL_P  16
+#define CTRL_N  14
+
+        /* initial situation */
+        if (cmd_head == cmd_tail)
+                return 0;
+        switch (*cmd) {
+        case CTRL_P:
+                if (cmdptr != cmd_tail)
+                        cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
+                strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+                return 1;
+        case CTRL_N:
+                if (cmdptr != cmd_head)
+                        cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
+                strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+                return 1;
+        }
+        return 0;
+}
+
+/*
+ * kdb_reboot - This function implements the 'reboot' command.  Reboot
+ *      the system immediately, or loop for ever on failure.
+ */
+static int kdb_reboot(int argc, const char **argv)
+{
+        emergency_restart();
+        kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
+        while (1)
+                cpu_relax();
+        /* NOTREACHED */
+        return 0;
+}
+
+static void kdb_dumpregs(struct pt_regs *regs)
+{
+        int old_lvl = console_loglevel;
+        console_loglevel = 15;
+        kdb_trap_printk++;
+        show_regs(regs);
+        kdb_trap_printk--;
+        kdb_printf("\n");
+        console_loglevel = old_lvl;
+}
+
+void kdb_set_current_task(struct task_struct *p)
+{
+        kdb_current_task = p;
+
+        if (kdb_task_has_cpu(p)) {
+                kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
+                return;
+        }
+        kdb_current_regs = NULL;
+}
+
+/*
+ * kdb_local - The main code for kdb.  This routine is invoked on a
+ *      specific processor, it is not global.  The main kdb() routine
+ *      ensures that only one processor at a time is in this routine.
+ *      This code is called with the real reason code on the first
+ *      entry to a kdb session, thereafter it is called with reason
+ *      SWITCH, even if the user goes back to the original cpu.
+ * Inputs:
+ *      reason          The reason KDB was invoked
+ *      error           The hardware-defined error code
+ *      regs            The exception frame at time of fault/breakpoint.
+ *      db_result       Result code from the break or debug point.
+ * Returns:
+ *      0       KDB was invoked for an event which it wasn't responsible
+ *      1       KDB handled the event for which it was invoked.
+ *      KDB_CMD_GO      User typed 'go'.
+ *      KDB_CMD_CPU     User switched to another cpu.
+ *      KDB_CMD_SS      Single step.
+ *      KDB_CMD_SSB     Single step until branch.
+ */
+static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
+                     kdb_dbtrap_t db_result)
+{
+        char *cmdbuf;
+        int diag;
+        struct task_struct *kdb_current =
+                kdb_curr_task(raw_smp_processor_id());
+
+        KDB_DEBUG_STATE("kdb_local 1", reason);
+        kdb_go_count = 0;
+        if (reason == KDB_REASON_DEBUG) {
+                /* special case below */
+        } else {
+                kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
+                           kdb_current, kdb_current->pid);
+#if defined(CONFIG_SMP)
+                kdb_printf("on processor %d ", raw_smp_processor_id());
+#endif
+        }
+
+        switch (reason) {
+        case KDB_REASON_DEBUG:
+        {
+                /*
+                 * If re-entering kdb after a single step
+                 * command, don't print the message.
+                 */
+                switch (db_result) {
+                case KDB_DB_BPT:
+                        kdb_printf("\nEntering kdb (0x%p, pid %d) ",
+                                   kdb_current, kdb_current->pid);
+#if defined(CONFIG_SMP)
+                        kdb_printf("on processor %d ", raw_smp_processor_id());
+#endif
+                        kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
+                                   instruction_pointer(regs));
+                        break;
+                case KDB_DB_SSB:
+                        /*
+                         * In the midst of ssb command. Just return.
+                         */
+                        KDB_DEBUG_STATE("kdb_local 3", reason);
+                        return KDB_CMD_SSB;     /* Continue with SSB command */
+
+                        break;
+                case KDB_DB_SS:
+                        break;
+                case KDB_DB_SSBPT:
+                        KDB_DEBUG_STATE("kdb_local 4", reason);
+                        return 1;       /* kdba_db_trap did the work */
+                default:
+                        kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
+                                   db_result);
+                        break;
+                }
+
+        }
+                break;
+        case KDB_REASON_ENTER:
+                if (KDB_STATE(KEYBOARD))
+                        kdb_printf("due to Keyboard Entry\n");
+                else
+                        kdb_printf("due to KDB_ENTER()\n");
+                break;
+        case KDB_REASON_KEYBOARD:
+                KDB_STATE_SET(KEYBOARD);
+                kdb_printf("due to Keyboard Entry\n");
+                break;
+        case KDB_REASON_ENTER_SLAVE:
+                /* drop through, slaves only get released via cpu switch */
+        case KDB_REASON_SWITCH:
+                kdb_printf("due to cpu switch\n");
+                break;
+        case KDB_REASON_OOPS:
+                kdb_printf("Oops: %s\n", kdb_diemsg);
+                kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
+                           instruction_pointer(regs));
+                kdb_dumpregs(regs);
+                break;
+        case KDB_REASON_NMI:
+                kdb_printf("due to NonMaskable Interrupt @ "
+                           kdb_machreg_fmt "\n",
+                           instruction_pointer(regs));
+                kdb_dumpregs(regs);
+                break;
+        case KDB_REASON_SSTEP:
+        case KDB_REASON_BREAK:
+                kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
+                           reason == KDB_REASON_BREAK ?
+                           "Breakpoint" : "SS trap", instruction_pointer(regs));
+                /*
+                 * Determine if this breakpoint is one that we
+                 * are interested in.
+                 */
+                if (db_result != KDB_DB_BPT) {
+                        kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
+                                   db_result);
+                        KDB_DEBUG_STATE("kdb_local 6", reason);
+                        return 0;       /* Not for us, dismiss it */
+                }
+                break;
+        case KDB_REASON_RECURSE:
+                kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
+                           instruction_pointer(regs));
+                break;
+        default:
+                kdb_printf("kdb: unexpected reason code: %d\n", reason);
+                KDB_DEBUG_STATE("kdb_local 8", reason);
+                return 0;       /* Not for us, dismiss it */
+        }
+
+        while (1) {
+                /*
+                 * Initialize pager context.
+                 */
+                kdb_nextline = 1;
+                KDB_STATE_CLEAR(SUPPRESS);
+
+                cmdbuf = cmd_cur;
+                *cmdbuf = '\0';
+                *(cmd_hist[cmd_head]) = '\0';
+
+                if (KDB_FLAG(ONLY_DO_DUMP)) {
+                        /* kdb is off but a catastrophic error requires a dump.
+                         * Take the dump and reboot.
+                         * Turn on logging so the kdb output appears in the log
+                         * buffer in the dump.
+                         */
+                        const char *setargs[] = { "set", "LOGGING", "1" };
+                        kdb_set(2, setargs);
+                        kdb_reboot(0, NULL);
+                        /*NOTREACHED*/
+                }
+
+do_full_getstr:
+#if defined(CONFIG_SMP)
+                snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
+                         raw_smp_processor_id());
+#else
+                snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
+#endif
+                if (defcmd_in_progress)
+                        strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
+
+                /*
+                 * Fetch command from keyboard
+                 */
+                cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
+                if (*cmdbuf != '\n') {
+                        if (*cmdbuf < 32) {
+                                if (cmdptr == cmd_head) {
+                                        strncpy(cmd_hist[cmd_head], cmd_cur,
+                                                CMD_BUFLEN);
+                                        *(cmd_hist[cmd_head] +
+                                          strlen(cmd_hist[cmd_head])-1) = '\0';
+                                }
+                                if (!handle_ctrl_cmd(cmdbuf))
+                                        *(cmd_cur+strlen(cmd_cur)-1) = '\0';
+                                cmdbuf = cmd_cur;
+                                goto do_full_getstr;
+                        } else {
+                                strncpy(cmd_hist[cmd_head], cmd_cur,
+                                        CMD_BUFLEN);
+                        }
+
+                        cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
+                        if (cmd_head == cmd_tail)
+                                cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
+                }
+
+                cmdptr = cmd_head;
+                diag = kdb_parse(cmdbuf);
+                if (diag == KDB_NOTFOUND) {
+                        kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
+                        diag = 0;
+                }
+                if (diag == KDB_CMD_GO
+                 || diag == KDB_CMD_CPU
+                 || diag == KDB_CMD_SS
+                 || diag == KDB_CMD_SSB
+                 || diag == KDB_CMD_KGDB)
+                        break;
+
+                if (diag)
+                        kdb_cmderror(diag);
+        }
+        KDB_DEBUG_STATE("kdb_local 9", diag);
+        return diag;
+}
+
+
+/*
+ * kdb_print_state - Print the state data for the current processor
+ *      for debugging.
+ * Inputs:
+ *      text            Identifies the debug point
+ *      value           Any integer value to be printed, e.g. reason code.
+ */
+void kdb_print_state(const char *text, int value)
+{
+        kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
+                   text, raw_smp_processor_id(), value, kdb_initial_cpu,
+                   kdb_state);
+}
+
+/*
+ * kdb_main_loop - After initial setup and assignment of the
+ *      controlling cpu, all cpus are in this loop.  One cpu is in
+ *      control and will issue the kdb prompt, the others will spin
+ *      until 'go' or cpu switch.
+ *
+ *      To get a consistent view of the kernel stacks for all
+ *      processes, this routine is invoked from the main kdb code via
+ *      an architecture specific routine.  kdba_main_loop is
+ *      responsible for making the kernel stacks consistent for all
+ *      processes, there should be no difference between a blocked
+ *      process and a running process as far as kdb is concerned.
+ * Inputs:
+ *      reason          The reason KDB was invoked
+ *      error           The hardware-defined error code
+ *      reason2         kdb's current reason code.
+ *                      Initially error but can change
+ *                      acording to kdb state.
+ *      db_result       Result code from break or debug point.
+ *      regs            The exception frame at time of fault/breakpoint.
+ *                      should always be valid.
+ * Returns:
+ *      0       KDB was invoked for an event which it wasn't responsible
+ *      1       KDB handled the event for which it was invoked.
+ */
+int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
+              kdb_dbtrap_t db_result, struct pt_regs *regs)
+{
+        int result = 1;
+        /* Stay in kdb() until 'go', 'ss[b]' or an error */
+        while (1) {
+                /*
+                 * All processors except the one that is in control
+                 * will spin here.
+                 */
+                KDB_DEBUG_STATE("kdb_main_loop 1", reason);
+                while (KDB_STATE(HOLD_CPU)) {
+                        /* state KDB is turned off by kdb_cpu to see if the
+                         * other cpus are still live, each cpu in this loop
+                         * turns it back on.
+                         */
+                        if (!KDB_STATE(KDB))
+                                KDB_STATE_SET(KDB);
+                }
+
+                KDB_STATE_CLEAR(SUPPRESS);
+                KDB_DEBUG_STATE("kdb_main_loop 2", reason);
+                if (KDB_STATE(LEAVING))
+                        break;  /* Another cpu said 'go' */
+                /* Still using kdb, this processor is in control */
+                result = kdb_local(reason2, error, regs, db_result);
+                KDB_DEBUG_STATE("kdb_main_loop 3", result);
+
+                if (result == KDB_CMD_CPU)
+                        break;
+
+                if (result == KDB_CMD_SS) {
+                        KDB_STATE_SET(DOING_SS);
+                        break;
+                }
+
+                if (result == KDB_CMD_SSB) {
+                        KDB_STATE_SET(DOING_SS);
+                        KDB_STATE_SET(DOING_SSB);
+                        break;
+                }
+
+                if (result == KDB_CMD_KGDB) {
+                        if (!(KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)))
+                                kdb_printf("Entering please attach debugger "
+                                           "or use $D#44+ or $3#33\n");
+                        break;
+                }
+                if (result && result != 1 && result != KDB_CMD_GO)
+                        kdb_printf("\nUnexpected kdb_local return code %d\n",
+                                   result);
+                KDB_DEBUG_STATE("kdb_main_loop 4", reason);
+                break;
+        }
+        if (KDB_STATE(DOING_SS))
+                KDB_STATE_CLEAR(SSBPT);
+
+        return result;
+}
+
+/*
+ * kdb_mdr - This function implements the guts of the 'mdr', memory
+ * read command.
+ *      mdr  <addr arg>,<byte count>
+ * Inputs:
+ *      addr    Start address
+ *      count   Number of bytes
+ * Returns:
+ *      Always 0.  Any errors are detected and printed by kdb_getarea.
+ */
+static int kdb_mdr(unsigned long addr, unsigned int count)
+{
+        unsigned char c;
+        while (count--) {
+                if (kdb_getarea(c, addr))
+                        return 0;
+                kdb_printf("%02x", c);
+                addr++;
+        }
+        kdb_printf("\n");
+        return 0;
+}
+
+/*
+ * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
+ *      'md8' 'mdr' and 'mds' commands.
+ *
+ *      md|mds  [<addr arg> [<line count> [<radix>]]]
+ *      mdWcN   [<addr arg> [<line count> [<radix>]]]
+ *              where W = is the width (1, 2, 4 or 8) and N is the count.
+ *              for eg., md1c20 reads 20 bytes, 1 at a time.
+ *      mdr  <addr arg>,<byte count>
+ */
+static void kdb_md_line(const char *fmtstr, unsigned long addr,
+                        int symbolic, int nosect, int bytesperword,
+                        int num, int repeat, int phys)
+{
+        /* print just one line of data */
+        kdb_symtab_t symtab;
+        char cbuf[32];
+        char *c = cbuf;
+        int i;
+        unsigned long word;
+
+        memset(cbuf, '\0', sizeof(cbuf));
+        if (phys)
+                kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
+        else
+                kdb_printf(kdb_machreg_fmt0 " ", addr);
+
+        for (i = 0; i < num && repeat--; i++) {
+                if (phys) {
+                        if (kdb_getphysword(&word, addr, bytesperword))
+                                break;
+                } else if (kdb_getword(&word, addr, bytesperword))
+                        break;
+                kdb_printf(fmtstr, word);
+                if (symbolic)
+                        kdbnearsym(word, &symtab);
+                else
+                        memset(&symtab, 0, sizeof(symtab));
+                if (symtab.sym_name) {
+                        kdb_symbol_print(word, &symtab, 0);
+                        if (!nosect) {
+                                kdb_printf("\n");
+                                kdb_printf("                       %s %s "
+                                           kdb_machreg_fmt " "
+                                           kdb_machreg_fmt " "
+                                           kdb_machreg_fmt, symtab.mod_name,
+                                           symtab.sec_name, symtab.sec_start,
+                                           symtab.sym_start, symtab.sym_end);
+                        }
+                        addr += bytesperword;
+                } else {
+                        union {
+                                u64 word;
+                                unsigned char c[8];
+                        } wc;
+                        unsigned char *cp;
+#ifdef  __BIG_ENDIAN
+                        cp = wc.c + 8 - bytesperword;
+#else
+                        cp = wc.c;
+#endif
+                        wc.word = word;
+#define printable_char(c) \
+        ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
+                        switch (bytesperword) {
+                        case 8:
+                                *c++ = printable_char(*cp++);
+                                *c++ = printable_char(*cp++);
+                                *c++ = printable_char(*cp++);
+                                *c++ = printable_char(*cp++);
+                                addr += 4;
+                        case 4:
+                                *c++ = printable_char(*cp++);
+                                *c++ = printable_char(*cp++);
+                                addr += 2;
+                        case 2:
+                                *c++ = printable_char(*cp++);
+                                addr++;
+                        case 1:
+                                *c++ = printable_char(*cp++);
+                                addr++;
+                                break;
+                        }
+#undef printable_char
+                }
+        }
+        kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
+                   " ", cbuf);
+}
+
+static int kdb_md(int argc, const char **argv)
+{
+        static unsigned long last_addr;
+        static int last_radix, last_bytesperword, last_repeat;
+        int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
+        int nosect = 0;
+        char fmtchar, fmtstr[64];
+        unsigned long addr;
+        unsigned long word;
+        long offset = 0;
+        int symbolic = 0;
+        int valid = 0;
+        int phys = 0;
+
+        kdbgetintenv("MDCOUNT", &mdcount);
+        kdbgetintenv("RADIX", &radix);
+        kdbgetintenv("BYTESPERWORD", &bytesperword);
+
+        /* Assume 'md <addr>' and start with environment values */
+        repeat = mdcount * 16 / bytesperword;
+
+        if (strcmp(argv[0], "mdr") == 0) {
+                if (argc != 2)
+                        return KDB_ARGCOUNT;
+                valid = 1;
+        } else if (isdigit(argv[0][2])) {
+                bytesperword = (int)(argv[0][2] - '0');
+                if (bytesperword == 0) {
+                        bytesperword = last_bytesperword;
+                        if (bytesperword == 0)
+                                bytesperword = 4;
+                }
+                last_bytesperword = bytesperword;
+                repeat = mdcount * 16 / bytesperword;
+                if (!argv[0][3])
+                        valid = 1;
+                else if (argv[0][3] == 'c' && argv[0][4]) {
+                        char *p;
+                        repeat = simple_strtoul(argv[0] + 4, &p, 10);
+                        mdcount = ((repeat * bytesperword) + 15) / 16;
+                        valid = !*p;
+                }
+                last_repeat = repeat;
+        } else if (strcmp(argv[0], "md") == 0)
+                valid = 1;
+        else if (strcmp(argv[0], "mds") == 0)
+                valid = 1;
+        else if (strcmp(argv[0], "mdp") == 0) {
+                phys = valid = 1;
+        }
+        if (!valid)
+                return KDB_NOTFOUND;
+
+        if (argc == 0) {
+                if (last_addr == 0)
+                        return KDB_ARGCOUNT;
+                addr = last_addr;
+                radix = last_radix;
+                bytesperword = last_bytesperword;
+                repeat = last_repeat;
+                mdcount = ((repeat * bytesperword) + 15) / 16;
+        }
+
+        if (argc) {
+                unsigned long val;
+                int diag, nextarg = 1;
+                diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
+                                     &offset, NULL);
+                if (diag)
+                        return diag;
+                if (argc > nextarg+2)
+                        return KDB_ARGCOUNT;
+
+                if (argc >= nextarg) {
+                        diag = kdbgetularg(argv[nextarg], &val);
+                        if (!diag) {
+                                mdcount = (int) val;
+                                repeat = mdcount * 16 / bytesperword;
+                        }
+                }
+                if (argc >= nextarg+1) {
+                        diag = kdbgetularg(argv[nextarg+1], &val);
+                        if (!diag)
+                                radix = (int) val;
+                }
+        }
+
+        if (strcmp(argv[0], "mdr") == 0)
+                return kdb_mdr(addr, mdcount);
+
+        switch (radix) {
+        case 10:
+                fmtchar = 'd';
+                break;
+        case 16:
+                fmtchar = 'x';
+                break;
+        case 8:
+                fmtchar = 'o';
+                break;
+        default:
+                return KDB_BADRADIX;
+        }
+
+        last_radix = radix;
+
+        if (bytesperword > KDB_WORD_SIZE)
+                return KDB_BADWIDTH;
+
+        switch (bytesperword) {
+        case 8:
+                sprintf(fmtstr, "%%16.16l%c ", fmtchar);
+                break;
+        case 4:
+                sprintf(fmtstr, "%%8.8l%c ", fmtchar);
+                break;
+        case 2:
+                sprintf(fmtstr, "%%4.4l%c ", fmtchar);
+                break;
+        case 1:
+                sprintf(fmtstr, "%%2.2l%c ", fmtchar);
+                break;
+        default:
+                return KDB_BADWIDTH;
+        }
+
+        last_repeat = repeat;
+        last_bytesperword = bytesperword;
+
+        if (strcmp(argv[0], "mds") == 0) {
+                symbolic = 1;
+                /* Do not save these changes as last_*, they are temporary mds
+                 * overrides.
+                 */
+                bytesperword = KDB_WORD_SIZE;
+                repeat = mdcount;
+                kdbgetintenv("NOSECT", &nosect);
+        }
+
+        /* Round address down modulo BYTESPERWORD */
+
+        addr &= ~(bytesperword-1);
+
+        while (repeat > 0) {
+                unsigned long a;
+                int n, z, num = (symbolic ? 1 : (16 / bytesperword));
+
+                if (KDB_FLAG(CMD_INTERRUPT))
+                        return 0;
+                for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
+                        if (phys) {
+                                if (kdb_getphysword(&word, a, bytesperword)
+                                                || word)
+                                        break;
+                        } else if (kdb_getword(&word, a, bytesperword) || word)
+                                break;
+                }
+                n = min(num, repeat);
+                kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
+                            num, repeat, phys);
+                addr += bytesperword * n;
+                repeat -= n;
+                z = (z + num - 1) / num;
+                if (z > 2) {
+                        int s = num * (z-2);
+                        kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
+                                   " zero suppressed\n",
+                                addr, addr + bytesperword * s - 1);
+                        addr += bytesperword * s;
+                        repeat -= s;
+                }
+        }
+        last_addr = addr;
+
+        return 0;
+}
+
+/*
+ * kdb_mm - This function implements the 'mm' command.
+ *      mm address-expression new-value
+ * Remarks:
+ *      mm works on machine words, mmW works on bytes.
+ */
+static int kdb_mm(int argc, const char **argv)
+{
+        int diag;
+        unsigned long addr;
+        long offset = 0;
+        unsigned long contents;
+        int nextarg;
+        int width;
+
+        if (argv[0][2] && !isdigit(argv[0][2]))
+                return KDB_NOTFOUND;
+
+        if (argc < 2)
+                return KDB_ARGCOUNT;
+
+        nextarg = 1;
+        diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
+        if (diag)
+                return diag;
+
+        if (nextarg > argc)
+                return KDB_ARGCOUNT;
+        diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
+        if (diag)
+                return diag;
+
+        if (nextarg != argc + 1)
+                return KDB_ARGCOUNT;
+
+        width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
+        diag = kdb_putword(addr, contents, width);
+        if (diag)
+                return diag;
+
+        kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
+
+        return 0;
+}
+
+/*
+ * kdb_go - This function implements the 'go' command.
+ *      go [address-expression]
+ */
+static int kdb_go(int argc, const char **argv)
+{
+        unsigned long addr;
+        int diag;
+        int nextarg;
+        long offset;
+
+        if (argc == 1) {
+                if (raw_smp_processor_id() != kdb_initial_cpu) {
+                        kdb_printf("go <address> must be issued from the "
+                                   "initial cpu, do cpu %d first\n",
+                                   kdb_initial_cpu);
+                        return KDB_ARGCOUNT;
+                }
+                nextarg = 1;
+                diag = kdbgetaddrarg(argc, argv, &nextarg,
+                                     &addr, &offset, NULL);
+                if (diag)
+                        return diag;
+        } else if (argc) {
+                return KDB_ARGCOUNT;
+        }
+
+        diag = KDB_CMD_GO;
+        if (KDB_FLAG(CATASTROPHIC)) {
+                kdb_printf("Catastrophic error detected\n");
+                kdb_printf("kdb_continue_catastrophic=%d, ",
+                        kdb_continue_catastrophic);
+                if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
+                        kdb_printf("type go a second time if you really want "
+                                   "to continue\n");
+                        return 0;
+                }
+                if (kdb_continue_catastrophic == 2) {
+                        kdb_printf("forcing reboot\n");
+                        kdb_reboot(0, NULL);
+                }
+                kdb_printf("attempting to continue\n");
+        }
+        return diag;
+}
+
+/*
+ * kdb_rd - This function implements the 'rd' command.
+ */
+static int kdb_rd(int argc, const char **argv)
+{
+        int diag = kdb_check_regs();
+        if (diag)
+                return diag;
+
+        kdb_dumpregs(kdb_current_regs);
+        return 0;
+}
+
+/*
+ * kdb_rm - This function implements the 'rm' (register modify)  command.
+ *      rm register-name new-contents
+ * Remarks:
+ *      Currently doesn't allow modification of control or
+ *      debug registers.
+ */
+static int kdb_rm(int argc, const char **argv)
+{
+        int diag;
+        int ind = 0;
+        unsigned long contents;
+
+        if (argc != 2)
+                return KDB_ARGCOUNT;
+        /*
+         * Allow presence or absence of leading '%' symbol.
+         */
+        if (argv[1][0] == '%')
+                ind = 1;
+
+        diag = kdbgetularg(argv[2], &contents);
+        if (diag)
+                return diag;
+
+        diag = kdb_check_regs();
+        if (diag)
+                return diag;
+        kdb_printf("ERROR: Register set currently not implemented\n");
+        return 0;
+}
+
+#if defined(CONFIG_MAGIC_SYSRQ)
+/*
+ * kdb_sr - This function implements the 'sr' (SYSRQ key) command
+ *      which interfaces to the soi-disant MAGIC SYSRQ functionality.
+ *              sr <magic-sysrq-code>
+ */
+static int kdb_sr(int argc, const char **argv)
+{
+        if (argc != 1)
+                return KDB_ARGCOUNT;
+        sysrq_toggle_support(1);
+        kdb_trap_printk++;
+        handle_sysrq(*argv[1], NULL);
+        kdb_trap_printk--;
+
+        return 0;
+}
+#endif  /* CONFIG_MAGIC_SYSRQ */
+
+/*
+ * kdb_ef - This function implements the 'regs' (display exception
+ *      frame) command.  This command takes an address and expects to
+ *      find an exception frame at that address, formats and prints
+ *      it.
+ *              regs address-expression
+ * Remarks:
+ *      Not done yet.
+ */
+static int kdb_ef(int argc, const char **argv)
+{
+        int diag;
+        unsigned long addr;
+        long offset;
+        int nextarg;
+
+        if (argc != 1)
+                return KDB_ARGCOUNT;
+
+        nextarg = 1;
+        diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
+        if (diag)
+                return diag;
+        show_regs((struct pt_regs *)addr);
+        return 0;
+}
+
+#if defined(CONFIG_MODULES)
+/* modules using other modules */
+struct module_use {
+        struct list_head list;
+        struct module *module_which_uses;
+};
+
+/*
+ * kdb_lsmod - This function implements the 'lsmod' command.  Lists
+ *      currently loaded kernel modules.
+ *      Mostly taken from userland lsmod.
+ */
+static int kdb_lsmod(int argc, const char **argv)
+{
+        struct module *mod;
+
+        if (argc != 0)
+                return KDB_ARGCOUNT;
+
+        kdb_printf("Module                  Size  modstruct     Used by\n");
+        list_for_each_entry(mod, kdb_modules, list) {
+
+                kdb_printf("%-20s%8u  0x%p ", mod->name,
+                           mod->core_size, (void *)mod);
+#ifdef CONFIG_MODULE_UNLOAD
+                kdb_printf("%4d ", module_refcount(mod));
+#endif
+                if (mod->state == MODULE_STATE_GOING)
+                        kdb_printf(" (Unloading)");
+                else if (mod->state == MODULE_STATE_COMING)
+                        kdb_printf(" (Loading)");
+                else
+                        kdb_printf(" (Live)");
+
+#ifdef CONFIG_MODULE_UNLOAD
+                {
+                        struct module_use *use;
+                        kdb_printf(" [ ");
+                        list_for_each_entry(use, &mod->modules_which_use_me,
+                                            list)
+                                kdb_printf("%s ", use->module_which_uses->name);
+                        kdb_printf("]\n");
+                }
+#endif
+        }
+
+        return 0;
+}
+
+#endif  /* CONFIG_MODULES */
+
+/*
+ * kdb_env - This function implements the 'env' command.  Display the
+ *      current environment variables.
+ */
+
+static int kdb_env(int argc, const char **argv)
+{
+        int i;
+
+        for (i = 0; i < __nenv; i++) {
+                if (__env[i])
+                        kdb_printf("%s\n", __env[i]);
+        }
+
+        if (KDB_DEBUG(MASK))
+                kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
+
+        return 0;
+}
+
+#ifdef CONFIG_PRINTK
+/*
+ * kdb_dmesg - This function implements the 'dmesg' command to display
+ *      the contents of the syslog buffer.
+ *              dmesg [lines] [adjust]
+ */
+static int kdb_dmesg(int argc, const char **argv)
+{
+        char *syslog_data[4], *start, *end, c = '\0', *p;
+        int diag, logging, logsize, lines = 0, adjust = 0, n;
+
+        if (argc > 2)
+                return KDB_ARGCOUNT;
+        if (argc) {
+                char *cp;
+                lines = simple_strtol(argv[1], &cp, 0);
+                if (*cp)
+                        lines = 0;
+                if (argc > 1) {
+                        adjust = simple_strtoul(argv[2], &cp, 0);
+                        if (*cp || adjust < 0)
+                                adjust = 0;
+                }
+        }
+
+        /* disable LOGGING if set */
+        diag = kdbgetintenv("LOGGING", &logging);
+        if (!diag && logging) {
+                const char *setargs[] = { "set", "LOGGING", "0" };
+                kdb_set(2, setargs);
+        }
+
+        /* syslog_data[0,1] physical start, end+1.  syslog_data[2,3]
+         * logical start, end+1. */
+        kdb_syslog_data(syslog_data);
+        if (syslog_data[2] == syslog_data[3])
+                return 0;
+        logsize = syslog_data[1] - syslog_data[0];
+        start = syslog_data[2];
+        end = syslog_data[3];
+#define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0])
+        for (n = 0, p = start; p < end; ++p) {
+                c = *KDB_WRAP(p);
+                if (c == '\n')
+                        ++n;
+        }
+        if (c != '\n')
+                ++n;
+        if (lines < 0) {
+                if (adjust >= n)
+                        kdb_printf("buffer only contains %d lines, nothing "
+                                   "printed\n", n);
+                else if (adjust - lines >= n)
+                        kdb_printf("buffer only contains %d lines, last %d "
+                                   "lines printed\n", n, n - adjust);
+                if (adjust) {
+                        for (; start < end && adjust; ++start) {
+                                if (*KDB_WRAP(start) == '\n')
+                                        --adjust;
+                        }
+                        if (start < end)
+                                ++start;
+                }
+                for (p = start; p < end && lines; ++p) {
+                        if (*KDB_WRAP(p) == '\n')
+                                ++lines;
+                }
+                end = p;
+        } else if (lines > 0) {
+                int skip = n - (adjust + lines);
+                if (adjust >= n) {
+                        kdb_printf("buffer only contains %d lines, "
+                                   "nothing printed\n", n);
+                        skip = n;
+                } else if (skip < 0) {
+                        lines += skip;
+                        skip = 0;
+                        kdb_printf("buffer only contains %d lines, first "
+                                   "%d lines printed\n", n, lines);
+                }
+                for (; start < end && skip; ++start) {
+                        if (*KDB_WRAP(start) == '\n')
+                                --skip;
+                }
+                for (p = start; p < end && lines; ++p) {
+                        if (*KDB_WRAP(p) == '\n')
+                                --lines;
+                }
+                end = p;
+        }
+        /* Do a line at a time (max 200 chars) to reduce protocol overhead */
+        c = '\n';
+        while (start != end) {
+                char buf[201];
+                p = buf;
+                if (KDB_FLAG(CMD_INTERRUPT))
+                        return 0;
+                while (start < end && (c = *KDB_WRAP(start)) &&
+                       (p - buf) < sizeof(buf)-1) {
+                        ++start;
+                        *p++ = c;
+                        if (c == '\n')
+                                break;
+                }
+                *p = '\0';
+                kdb_printf("%s", buf);
+        }
+        if (c != '\n')
+                kdb_printf("\n");
+
+        return 0;
+}
+#endif /* CONFIG_PRINTK */
+/*
+ * kdb_cpu - This function implements the 'cpu' command.
+ *      cpu     [<cpunum>]
+ * Returns:
+ *      KDB_CMD_CPU for success, a kdb diagnostic if error
+ */
+static void kdb_cpu_status(void)
+{
+        int i, start_cpu, first_print = 1;
+        char state, prev_state = '?';
+
+        kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
+        kdb_printf("Available cpus: ");
+        for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
+                if (!cpu_online(i)) {
+                        state = 'F';    /* cpu is offline */
+                } else {
+                        state = ' ';    /* cpu is responding to kdb */
+                        if (kdb_task_state_char(KDB_TSK(i)) == 'I')
+                                state = 'I';    /* idle task */
+                }
+                if (state != prev_state) {
+                        if (prev_state != '?') {
+                                if (!first_print)
+                                        kdb_printf(", ");
+                                first_print = 0;
+                                kdb_printf("%d", start_cpu);
+                                if (start_cpu < i-1)
+                                        kdb_printf("-%d", i-1);
+                                if (prev_state != ' ')
+                                        kdb_printf("(%c)", prev_state);
+                        }
+                        prev_state = state;
+                        start_cpu = i;
+                }
+        }
+        /* print the trailing cpus, ignoring them if they are all offline */
+        if (prev_state != 'F') {
+                if (!first_print)
+                        kdb_printf(", ");
+                kdb_printf("%d", start_cpu);
+                if (start_cpu < i-1)
+                        kdb_printf("-%d", i-1);
+                if (prev_state != ' ')
+                        kdb_printf("(%c)", prev_state);
+        }
+        kdb_printf("\n");
+}
+
+static int kdb_cpu(int argc, const char **argv)
+{
+        unsigned long cpunum;
+        int diag;
+
+        if (argc == 0) {
+                kdb_cpu_status();
+                return 0;
+        }
+
+        if (argc != 1)
+                return KDB_ARGCOUNT;
+
+        diag = kdbgetularg(argv[1], &cpunum);
+        if (diag)
+                return diag;
+
+        /*
+         * Validate cpunum
+         */
+        if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
+                return KDB_BADCPUNUM;
+
+        dbg_switch_cpu = cpunum;
+
+        /*
+         * Switch to other cpu
+         */
+        return KDB_CMD_CPU;
+}
+
+/* The user may not realize that ps/bta with no parameters does not print idle
+ * or sleeping system daemon processes, so tell them how many were suppressed.
+ */
+void kdb_ps_suppressed(void)
+{
+        int idle = 0, daemon = 0;
+        unsigned long mask_I = kdb_task_state_string("I"),
+                      mask_M = kdb_task_state_string("M");
+        unsigned long cpu;
+        const struct task_struct *p, *g;
+        for_each_online_cpu(cpu) {
+                p = kdb_curr_task(cpu);
+                if (kdb_task_state(p, mask_I))
+                        ++idle;
+        }
+        kdb_do_each_thread(g, p) {
+                if (kdb_task_state(p, mask_M))
+                        ++daemon;
+        } kdb_while_each_thread(g, p);
+        if (idle || daemon) {
+                if (idle)
+                        kdb_printf("%d idle process%s (state I)%s\n",
+                                   idle, idle == 1 ? "" : "es",
+                                   daemon ? " and " : "");
+                if (daemon)
+                        kdb_printf("%d sleeping system daemon (state M) "
+                                   "process%s", daemon,
+                                   daemon == 1 ? "" : "es");
+                kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
+        }
+}
+
+/*
+ * kdb_ps - This function implements the 'ps' command which shows a
+ *      list of the active processes.
+ *              ps [DRSTCZEUIMA]   All processes, optionally filtered by state
+ */
+void kdb_ps1(const struct task_struct *p)
+{
+        int cpu;
+        unsigned long tmp;
+
+        if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
+                return;
+
+        cpu = kdb_process_cpu(p);
+        kdb_printf("0x%p %8d %8d  %d %4d   %c  0x%p %c%s\n",
+                   (void *)p, p->pid, p->parent->pid,
+                   kdb_task_has_cpu(p), kdb_process_cpu(p),
+                   kdb_task_state_char(p),
+                   (void *)(&p->thread),
+                   p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
+                   p->comm);
+        if (kdb_task_has_cpu(p)) {
+                if (!KDB_TSK(cpu)) {
+                        kdb_printf("  Error: no saved data for this cpu\n");
+                } else {
+                        if (KDB_TSK(cpu) != p)
+                                kdb_printf("  Error: does not match running "
+                                   "process table (0x%p)\n", KDB_TSK(cpu));
+                }
+        }
+}
+
+static int kdb_ps(int argc, const char **argv)
+{
+        struct task_struct *g, *p;
+        unsigned long mask, cpu;
+
+        if (argc == 0)
+                kdb_ps_suppressed();
+        kdb_printf("%-*s      Pid   Parent [*] cpu State %-*s Command\n",
+                (int)(2*sizeof(void *))+2, "Task Addr",
+                (int)(2*sizeof(void *))+2, "Thread");
+        mask = kdb_task_state_string(argc ? argv[1] : NULL);
+        /* Run the active tasks first */
+        for_each_online_cpu(cpu) {
+                if (KDB_FLAG(CMD_INTERRUPT))
+                        return 0;
+                p = kdb_curr_task(cpu);
+                if (kdb_task_state(p, mask))
+                        kdb_ps1(p);
+        }
+        kdb_printf("\n");
+        /* Now the real tasks */
+        kdb_do_each_thread(g, p) {
+                if (KDB_FLAG(CMD_INTERRUPT))
+                        return 0;
+                if (kdb_task_state(p, mask))
+                        kdb_ps1(p);
+        } kdb_while_each_thread(g, p);
+
+        return 0;
+}
+
+/*
+ * kdb_pid - This function implements the 'pid' command which switches
+ *      the currently active process.
+ *              pid [<pid> | R]
+ */
+static int kdb_pid(int argc, const char **argv)
+{
+        struct task_struct *p;
+        unsigned long val;
+        int diag;
+
+        if (argc > 1)
+                return KDB_ARGCOUNT;
+
+        if (argc) {
+                if (strcmp(argv[1], "R") == 0) {
+                        p = KDB_TSK(kdb_initial_cpu);
+                } else {
+                        diag = kdbgetularg(argv[1], &val);
+                        if (diag)
+                                return KDB_BADINT;
+
+                        p = find_task_by_pid_ns((pid_t)val,     &init_pid_ns);
+                        if (!p) {
+                                kdb_printf("No task with pid=%d\n", (pid_t)val);
+                                return 0;
+                        }
+                }
+                kdb_set_current_task(p);
+        }
+        kdb_printf("KDB current process is %s(pid=%d)\n",
+                   kdb_current_task->comm,
+                   kdb_current_task->pid);
+
+        return 0;
+}
+
+/*
+ * kdb_ll - This function implements the 'll' command which follows a
+ *      linked list and executes an arbitrary command for each
+ *      element.
+ */
+static int kdb_ll(int argc, const char **argv)
+{
+        int diag;
+        unsigned long addr;
+        long offset = 0;
+        unsigned long va;
+        unsigned long linkoffset;
+        int nextarg;
+        const char *command;
+
+        if (argc != 3)
+                return KDB_ARGCOUNT;
+
+        nextarg = 1;
+        diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
+        if (diag)
+                return diag;
+
+        diag = kdbgetularg(argv[2], &linkoffset);
+        if (diag)
+                return diag;
+
+        /*
+         * Using the starting address as
+         * the first element in the list, and assuming that
+         * the list ends with a null pointer.
+         */
+
+        va = addr;
+        command = kdb_strdup(argv[3], GFP_KDB);
+        if (!command) {
+                kdb_printf("%s: cannot duplicate command\n", __func__);
+                return 0;
+        }
+        /* Recursive use of kdb_parse, do not use argv after this point */
+        argv = NULL;
+
+        while (va) {
+                char buf[80];
+
+                sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va);
+                diag = kdb_parse(buf);
+                if (diag)
+                        return diag;
+
+                addr = va + linkoffset;
+                if (kdb_getword(&va, addr, sizeof(va)))
+                        return 0;
+        }
+        kfree(command);
+
+        return 0;
+}
+
+static int kdb_kgdb(int argc, const char **argv)
+{
+        return KDB_CMD_KGDB;
+}
+
+/*
+ * kdb_help - This function implements the 'help' and '?' commands.
+ */
+static int kdb_help(int argc, const char **argv)
+{
+        kdbtab_t *kt;
+        int i;
+
+        kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
+        kdb_printf("-----------------------------"
+                   "-----------------------------\n");
+        for_each_kdbcmd(kt, i) {
+                if (kt->cmd_name)
+                        kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name,
+                                   kt->cmd_usage, kt->cmd_help);
+                if (KDB_FLAG(CMD_INTERRUPT))
+                        return 0;
+        }
+        return 0;
+}
+
+/*
+ * kdb_kill - This function implements the 'kill' commands.
+ */
+static int kdb_kill(int argc, const char **argv)
+{
+        long sig, pid;
+        char *endp;
+        struct task_struct *p;
+        struct siginfo info;
+
+        if (argc != 2)
+                return KDB_ARGCOUNT;
+
+        sig = simple_strtol(argv[1], &endp, 0);
+        if (*endp)
+                return KDB_BADINT;
+        if (sig >= 0) {
+                kdb_printf("Invalid signal parameter.<-signal>\n");
+                return 0;
+        }
+        sig = -sig;
+
+        pid = simple_strtol(argv[2], &endp, 0);
+        if (*endp)
+                return KDB_BADINT;
+        if (pid <= 0) {
+                kdb_printf("Process ID must be large than 0.\n");
+                return 0;
+        }
+
+        /* Find the process. */
+        p = find_task_by_pid_ns(pid, &init_pid_ns);
+        if (!p) {
+                kdb_printf("The specified process isn't found.\n");
+                return 0;
+        }
+        p = p->group_leader;
+        info.si_signo = sig;
+        info.si_errno = 0;
+        info.si_code = SI_USER;
+        info.si_pid = pid;  /* same capabilities as process being signalled */
+        info.si_uid = 0;    /* kdb has root authority */
+        kdb_send_sig_info(p, &info);
+        return 0;
+}
+
+struct kdb_tm {
+        int tm_sec;     /* seconds */
+        int tm_min;     /* minutes */
+        int tm_hour;    /* hours */
+        int tm_mday;    /* day of the month */
+        int tm_mon;     /* month */
+        int tm_year;    /* year */
+};
+
+static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
+{
+        /* This will work from 1970-2099, 2100 is not a leap year */
+        static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
+                                 31, 30, 31, 30, 31 };
+        memset(tm, 0, sizeof(*tm));
+        tm->tm_sec  = tv->tv_sec % (24 * 60 * 60);
+        tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
+                (2 * 365 + 1); /* shift base from 1970 to 1968 */
+        tm->tm_min =  tm->tm_sec / 60 % 60;
+        tm->tm_hour = tm->tm_sec / 60 / 60;
+        tm->tm_sec =  tm->tm_sec % 60;
+        tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
+        tm->tm_mday %= (4*365+1);
+        mon_day[1] = 29;
+        while (tm->tm_mday >= mon_day[tm->tm_mon]) {
+                tm->tm_mday -= mon_day[tm->tm_mon];
+                if (++tm->tm_mon == 12) {
+                        tm->tm_mon = 0;
+                        ++tm->tm_year;
+                        mon_day[1] = 28;
+                }
+        }
+        ++tm->tm_mday;
+}
+
+/*
+ * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
+ * I cannot call that code directly from kdb, it has an unconditional
+ * cli()/sti() and calls routines that take locks which can stop the debugger.
+ */
+static void kdb_sysinfo(struct sysinfo *val)
+{
+        struct timespec uptime;
+        do_posix_clock_monotonic_gettime(&uptime);
+        memset(val, 0, sizeof(*val));
+        val->uptime = uptime.tv_sec;
+        val->loads[0] = avenrun[0];
+        val->loads[1] = avenrun[1];
+        val->loads[2] = avenrun[2];
+        val->procs = nr_threads-1;
+        si_meminfo(val);
+
+        return;
+}
+
+/*
+ * kdb_summary - This function implements the 'summary' command.
+ */
+static int kdb_summary(int argc, const char **argv)
+{
+        struct kdb_tm tm;
+        struct sysinfo val;
+
+        if (argc)
+                return KDB_ARGCOUNT;
+
+        kdb_printf("sysname    %s\n", init_uts_ns.name.sysname);
+        kdb_printf("release    %s\n", init_uts_ns.name.release);
+        kdb_printf("version    %s\n", init_uts_ns.name.version);
+        kdb_printf("machine    %s\n", init_uts_ns.name.machine);
+        kdb_printf("nodename   %s\n", init_uts_ns.name.nodename);
+        kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
+        kdb_printf("ccversion  %s\n", __stringify(CCVERSION));
+
+        kdb_gmtime(&xtime, &tm);
+        kdb_printf("date       %04d-%02d-%02d %02d:%02d:%02d "
+                   "tz_minuteswest %d\n",
+                1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
+                tm.tm_hour, tm.tm_min, tm.tm_sec,
+                sys_tz.tz_minuteswest);
+
+        kdb_sysinfo(&val);
+        kdb_printf("uptime     ");
+        if (val.uptime > (24*60*60)) {
+                int days = val.uptime / (24*60*60);
+                val.uptime %= (24*60*60);
+                kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
+        }
+        kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
+
+        /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
+
+#define LOAD_INT(x) ((x) >> FSHIFT)
+#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
+        kdb_printf("load avg   %ld.%02ld %ld.%02ld %ld.%02ld\n",
+                LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
+                LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
+                LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
+#undef LOAD_INT
+#undef LOAD_FRAC
+        /* Display in kilobytes */
+#define K(x) ((x) << (PAGE_SHIFT - 10))
+        kdb_printf("\nMemTotal:       %8lu kB\nMemFree:        %8lu kB\n"
+                   "Buffers:        %8lu kB\n",
+                   val.totalram, val.freeram, val.bufferram);
+        return 0;
+}
+
+/*
+ * kdb_per_cpu - This function implements the 'per_cpu' command.
+ */
+static int kdb_per_cpu(int argc, const char **argv)
+{
+        char buf[256], fmtstr[64];
+        kdb_symtab_t symtab;
+        cpumask_t suppress = CPU_MASK_NONE;
+        int cpu, diag;
+        unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL;
+
+        if (argc < 1 || argc > 3)
+                return KDB_ARGCOUNT;
+
+        snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]);
+        if (!kdbgetsymval(buf, &symtab)) {
+                kdb_printf("%s is not a per_cpu variable\n", argv[1]);
+                return KDB_BADADDR;
+        }
+        if (argc >= 2) {
+                diag = kdbgetularg(argv[2], &bytesperword);
+                if (diag)
+                        return diag;
+        }
+        if (!bytesperword)
+                bytesperword = KDB_WORD_SIZE;
+        else if (bytesperword > KDB_WORD_SIZE)
+                return KDB_BADWIDTH;
+        sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
+        if (argc >= 3) {
+                diag = kdbgetularg(argv[3], &whichcpu);
+                if (diag)
+                        return diag;
+                if (!cpu_online(whichcpu)) {
+                        kdb_printf("cpu %ld is not online\n", whichcpu);
+                        return KDB_BADCPUNUM;
+                }
+        }
+
+        /* Most architectures use __per_cpu_offset[cpu], some use
+         * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
+         */
+#ifdef  __per_cpu_offset
+#define KDB_PCU(cpu) __per_cpu_offset(cpu)
+#else
+#ifdef  CONFIG_SMP
+#define KDB_PCU(cpu) __per_cpu_offset[cpu]
+#else
+#define KDB_PCU(cpu) 0
+#endif
+#endif
+
+        for_each_online_cpu(cpu) {
+                if (whichcpu != ~0UL && whichcpu != cpu)
+                        continue;
+                addr = symtab.sym_start + KDB_PCU(cpu);
+                diag = kdb_getword(&val, addr, bytesperword);
+                if (diag) {
+                        kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
+                                   "read, diag=%d\n", cpu, addr, diag);
+                        continue;
+                }
+#ifdef  CONFIG_SMP
+                if (!val) {
+                        cpu_set(cpu, suppress);
+                        continue;
+                }
+#endif  /* CONFIG_SMP */
+                kdb_printf("%5d ", cpu);
+                kdb_md_line(fmtstr, addr,
+                        bytesperword == KDB_WORD_SIZE,
+                        1, bytesperword, 1, 1, 0);
+        }
+        if (cpus_weight(suppress) == 0)
+                return 0;
+        kdb_printf("Zero suppressed cpu(s):");
+        for (cpu = first_cpu(suppress); cpu < num_possible_cpus();
+             cpu = next_cpu(cpu, suppress)) {
+                kdb_printf(" %d", cpu);
+                if (cpu == num_possible_cpus() - 1 ||
+                    next_cpu(cpu, suppress) != cpu + 1)
+                        continue;
+                while (cpu < num_possible_cpus() &&
+                       next_cpu(cpu, suppress) == cpu + 1)
+                        ++cpu;
+                kdb_printf("-%d", cpu);
+        }
+        kdb_printf("\n");
+
+#undef KDB_PCU
+
+        return 0;
+}
+
+/*
+ * display help for the use of cmd | grep pattern
+ */
+static int kdb_grep_help(int argc, const char **argv)
+{
+        kdb_printf("Usage of  cmd args | grep pattern:\n");
+        kdb_printf("  Any command's output may be filtered through an ");
+        kdb_printf("emulated 'pipe'.\n");
+        kdb_printf("  'grep' is just a key word.\n");
+        kdb_printf("  The pattern may include a very limited set of "
+                   "metacharacters:\n");
+        kdb_printf("   pattern or ^pattern or pattern$ or ^pattern$\n");
+        kdb_printf("  And if there are spaces in the pattern, you may "
+                   "quote it:\n");
+        kdb_printf("   \"pat tern\" or \"^pat tern\" or \"pat tern$\""
+                   " or \"^pat tern$\"\n");
+        return 0;
+}
+
+/*
+ * kdb_register_repeat - This function is used to register a kernel
+ *      debugger command.
+ * Inputs:
+ *      cmd     Command name
+ *      func    Function to execute the command
+ *      usage   A simple usage string showing arguments
+ *      help    A simple help string describing command
+ *      repeat  Does the command auto repeat on enter?
+ * Returns:
+ *      zero for success, one if a duplicate command.
+ */
+#define kdb_command_extend 50   /* arbitrary */
+int kdb_register_repeat(char *cmd,
+                        kdb_func_t func,
+                        char *usage,
+                        char *help,
+                        short minlen,
+                        kdb_repeat_t repeat)
+{
+        int i;
+        kdbtab_t *kp;
+
+        /*
+         *  Brute force method to determine duplicates
+         */
+        for_each_kdbcmd(kp, i) {
+                if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
+                        kdb_printf("Duplicate kdb command registered: "
+                                "%s, func %p help %s\n", cmd, func, help);
+                        return 1;
+                }
+        }
+
+        /*
+         * Insert command into first available location in table
+         */
+        for_each_kdbcmd(kp, i) {
+                if (kp->cmd_name == NULL)
+                        break;
+        }
+
+        if (i >= kdb_max_commands) {
+                kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
+                         kdb_command_extend) * sizeof(*new), GFP_KDB);
+                if (!new) {
+                        kdb_printf("Could not allocate new kdb_command "
+                                   "table\n");
+                        return 1;
+                }
+                if (kdb_commands) {
+                        memcpy(new, kdb_commands,
+                               kdb_max_commands * sizeof(*new));
+                        kfree(kdb_commands);
+                }
+                memset(new + kdb_max_commands, 0,
+                       kdb_command_extend * sizeof(*new));
+                kdb_commands = new;
+                kp = kdb_commands + kdb_max_commands;
+                kdb_max_commands += kdb_command_extend;
+        }
+
+        kp->cmd_name   = cmd;
+        kp->cmd_func   = func;
+        kp->cmd_usage  = usage;
+        kp->cmd_help   = help;
+        kp->cmd_flags  = 0;
+        kp->cmd_minlen = minlen;
+        kp->cmd_repeat = repeat;
+
+        return 0;
+}
+
+/*
+ * kdb_register - Compatibility register function for commands that do
+ *      not need to specify a repeat state.  Equivalent to
+ *      kdb_register_repeat with KDB_REPEAT_NONE.
+ * Inputs:
+ *      cmd     Command name
+ *      func    Function to execute the command
+ *      usage   A simple usage string showing arguments
+ *      help    A simple help string describing command
+ * Returns:
+ *      zero for success, one if a duplicate command.
+ */
+int kdb_register(char *cmd,
+             kdb_func_t func,
+             char *usage,
+             char *help,
+             short minlen)
+{
+        return kdb_register_repeat(cmd, func, usage, help, minlen,
+                                   KDB_REPEAT_NONE);
+}
+
+/*
+ * kdb_unregister - This function is used to unregister a kernel
+ *      debugger command.  It is generally called when a module which
+ *      implements kdb commands is unloaded.
+ * Inputs:
+ *      cmd     Command name
+ * Returns:
+ *      zero for success, one command not registered.
+ */
+int kdb_unregister(char *cmd)
+{
+        int i;
+        kdbtab_t *kp;
+
+        /*
+         *  find the command.
+         */
+        for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) {
+                if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
+                        kp->cmd_name = NULL;
+                        return 0;
+                }
+        }
+
+        /* Couldn't find it.  */
+        return 1;
+}
+
+/* Initialize the kdb command table. */
+static void __init kdb_inittab(void)
+{
+        int i;
+        kdbtab_t *kp;
+
+        for_each_kdbcmd(kp, i)
+                kp->cmd_name = NULL;
+
+        kdb_register_repeat("md", kdb_md, "<vaddr>",
+          "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
+                            KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
+          "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
+          "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("mds", kdb_md, "<vaddr>",
+          "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
+          "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
+        kdb_register_repeat("go", kdb_go, "[<vaddr>]",
+          "Continue Execution", 1, KDB_REPEAT_NONE);
+        kdb_register_repeat("rd", kdb_rd, "",
+          "Display Registers", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
+          "Modify Registers", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("ef", kdb_ef, "<vaddr>",
+          "Display exception frame", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
+          "Stack traceback", 1, KDB_REPEAT_NONE);
+        kdb_register_repeat("btp", kdb_bt, "<pid>",
+          "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
+          "Display stack all processes", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("btc", kdb_bt, "",
+          "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("btt", kdb_bt, "<vaddr>",
+          "Backtrace process given its struct task address", 0,
+                            KDB_REPEAT_NONE);
+        kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>",
+          "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("env", kdb_env, "",
+          "Show environment variables", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("set", kdb_set, "",
+          "Set environment variables", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("help", kdb_help, "",
+          "Display Help Message", 1, KDB_REPEAT_NONE);
+        kdb_register_repeat("?", kdb_help, "",
+          "Display Help Message", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
+          "Switch to new cpu", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("kgdb", kdb_kgdb, "",
+          "Enter kgdb mode", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
+          "Display active task list", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("pid", kdb_pid, "<pidnum>",
+          "Switch to another task", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("reboot", kdb_reboot, "",
+          "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
+#if defined(CONFIG_MODULES)
+        kdb_register_repeat("lsmod", kdb_lsmod, "",
+          "List loaded kernel modules", 0, KDB_REPEAT_NONE);
+#endif
+#if defined(CONFIG_MAGIC_SYSRQ)
+        kdb_register_repeat("sr", kdb_sr, "<key>",
+          "Magic SysRq key", 0, KDB_REPEAT_NONE);
+#endif
+#if defined(CONFIG_PRINTK)
+        kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
+          "Display syslog buffer", 0, KDB_REPEAT_NONE);
+#endif
+        kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
+          "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
+          "Send a signal to a process", 0, KDB_REPEAT_NONE);
+        kdb_register_repeat("summary", kdb_summary, "",
+          "Summarize the system", 4, KDB_REPEAT_NONE);
+        kdb_register_repeat("per_cpu", kdb_per_cpu, "",
+          "Display per_cpu variables", 3, KDB_REPEAT_NONE);
+        kdb_register_repeat("grephelp", kdb_grep_help, "",
+          "Display help on | grep", 0, KDB_REPEAT_NONE);
+}
+
+/* Execute any commands defined in kdb_cmds.  */
+static void __init kdb_cmd_init(void)
+{
+        int i, diag;
+        for (i = 0; kdb_cmds[i]; ++i) {
+                diag = kdb_parse(kdb_cmds[i]);
+                if (diag)
+                        kdb_printf("kdb command %s failed, kdb diag %d\n",
+                                kdb_cmds[i], diag);
+        }
+        if (defcmd_in_progress) {
+                kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
+                kdb_parse("endefcmd");
+        }
+}
+
+/* Intialize kdb_printf, breakpoint tables and kdb state */
+void __init kdb_init(int lvl)
+{
+        static int kdb_init_lvl = KDB_NOT_INITIALIZED;
+        int i;
+
+        if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
+                return;
+        for (i = kdb_init_lvl; i < lvl; i++) {
+                switch (i) {
+                case KDB_NOT_INITIALIZED:
+                        kdb_inittab();          /* Initialize Command Table */
+                        kdb_initbptab();        /* Initialize Breakpoints */
+                        break;
+                case KDB_INIT_EARLY:
+                        kdb_cmd_init();         /* Build kdb_cmds tables */
+                        break;
+                }
+        }
+        kdb_init_lvl = lvl;
+}
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
new file mode 100644
index 000000000000..97d3ba69775d
--- /dev/null
+++ b/kernel/debug/kdb/kdb_private.h
@@ -0,0 +1,300 @@
+#ifndef _KDBPRIVATE_H
+#define _KDBPRIVATE_H
+
+/*
+ * Kernel Debugger Architecture Independent Private Headers
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ */
+
+#include <linux/kgdb.h>
+#include "../debug_core.h"
+
+/* Kernel Debugger Error codes.  Must not overlap with command codes. */
+#define KDB_NOTFOUND    (-1)
+#define KDB_ARGCOUNT    (-2)
+#define KDB_BADWIDTH    (-3)
+#define KDB_BADRADIX    (-4)
+#define KDB_NOTENV      (-5)
+#define KDB_NOENVVALUE  (-6)
+#define KDB_NOTIMP      (-7)
+#define KDB_ENVFULL     (-8)
+#define KDB_ENVBUFFULL  (-9)
+#define KDB_TOOMANYBPT  (-10)
+#define KDB_TOOMANYDBREGS (-11)
+#define KDB_DUPBPT      (-12)
+#define KDB_BPTNOTFOUND (-13)
+#define KDB_BADMODE     (-14)
+#define KDB_BADINT      (-15)
+#define KDB_INVADDRFMT  (-16)
+#define KDB_BADREG      (-17)
+#define KDB_BADCPUNUM   (-18)
+#define KDB_BADLENGTH   (-19)
+#define KDB_NOBP        (-20)
+#define KDB_BADADDR     (-21)
+
+/* Kernel Debugger Command codes.  Must not overlap with error codes. */
+#define KDB_CMD_GO      (-1001)
+#define KDB_CMD_CPU     (-1002)
+#define KDB_CMD_SS      (-1003)
+#define KDB_CMD_SSB     (-1004)
+#define KDB_CMD_KGDB (-1005)
+#define KDB_CMD_KGDB2 (-1006)
+
+/* Internal debug flags */
+#define KDB_DEBUG_FLAG_BP       0x0002  /* Breakpoint subsystem debug */
+#define KDB_DEBUG_FLAG_BB_SUMM  0x0004  /* Basic block analysis, summary only */
+#define KDB_DEBUG_FLAG_AR       0x0008  /* Activation record, generic */
+#define KDB_DEBUG_FLAG_ARA      0x0010  /* Activation record, arch specific */
+#define KDB_DEBUG_FLAG_BB       0x0020  /* All basic block analysis */
+#define KDB_DEBUG_FLAG_STATE    0x0040  /* State flags */
+#define KDB_DEBUG_FLAG_MASK     0xffff  /* All debug flags */
+#define KDB_DEBUG_FLAG_SHIFT    16      /* Shift factor for dbflags */
+
+#define KDB_DEBUG(flag) (kdb_flags & \
+        (KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
+#define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
+                kdb_print_state(text, value)
+
+#if BITS_PER_LONG == 32
+
+#define KDB_PLATFORM_ENV        "BYTESPERWORD=4"
+
+#define kdb_machreg_fmt         "0x%lx"
+#define kdb_machreg_fmt0        "0x%08lx"
+#define kdb_bfd_vma_fmt         "0x%lx"
+#define kdb_bfd_vma_fmt0        "0x%08lx"
+#define kdb_elfw_addr_fmt       "0x%x"
+#define kdb_elfw_addr_fmt0      "0x%08x"
+#define kdb_f_count_fmt         "%d"
+
+#elif BITS_PER_LONG == 64
+
+#define KDB_PLATFORM_ENV        "BYTESPERWORD=8"
+
+#define kdb_machreg_fmt         "0x%lx"
+#define kdb_machreg_fmt0        "0x%016lx"
+#define kdb_bfd_vma_fmt         "0x%lx"
+#define kdb_bfd_vma_fmt0        "0x%016lx"
+#define kdb_elfw_addr_fmt       "0x%x"
+#define kdb_elfw_addr_fmt0      "0x%016x"
+#define kdb_f_count_fmt         "%ld"
+
+#endif
+
+/*
+ * KDB_MAXBPT describes the total number of breakpoints
+ * supported by this architecure.
+ */
+#define KDB_MAXBPT      16
+
+/* Maximum number of arguments to a function  */
+#define KDB_MAXARGS    16
+
+typedef enum {
+        KDB_REPEAT_NONE = 0,    /* Do not repeat this command */
+        KDB_REPEAT_NO_ARGS,     /* Repeat the command without arguments */
+        KDB_REPEAT_WITH_ARGS,   /* Repeat the command including its arguments */
+} kdb_repeat_t;
+
+typedef int (*kdb_func_t)(int, const char **);
+
+/* Symbol table format returned by kallsyms. */
+typedef struct __ksymtab {
+                unsigned long value;    /* Address of symbol */
+                const char *mod_name;   /* Module containing symbol or
+                                         * "kernel" */
+                unsigned long mod_start;
+                unsigned long mod_end;
+                const char *sec_name;   /* Section containing symbol */
+                unsigned long sec_start;
+                unsigned long sec_end;
+                const char *sym_name;   /* Full symbol name, including
+                                         * any version */
+                unsigned long sym_start;
+                unsigned long sym_end;
+                } kdb_symtab_t;
+extern int kallsyms_symbol_next(char *prefix_name, int flag);
+extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
+
+/* Exported Symbols for kernel loadable modules to use. */
+extern int kdb_register(char *, kdb_func_t, char *, char *, short);
+extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
+                               short, kdb_repeat_t);
+extern int kdb_unregister(char *);
+
+extern int kdb_getarea_size(void *, unsigned long, size_t);
+extern int kdb_putarea_size(unsigned long, void *, size_t);
+
+/*
+ * Like get_user and put_user, kdb_getarea and kdb_putarea take variable
+ * names, not pointers.  The underlying *_size functions take pointers.
+ */
+#define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
+#define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
+
+extern int kdb_getphysword(unsigned long *word,
+                        unsigned long addr, size_t size);
+extern int kdb_getword(unsigned long *, unsigned long, size_t);
+extern int kdb_putword(unsigned long, unsigned long, size_t);
+
+extern int kdbgetularg(const char *, unsigned long *);
+extern int kdb_set(int, const char **);
+extern char *kdbgetenv(const char *);
+extern int kdbgetintenv(const char *, int *);
+extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
+                         long *, char **);
+extern int kdbgetsymval(const char *, kdb_symtab_t *);
+extern int kdbnearsym(unsigned long, kdb_symtab_t *);
+extern void kdbnearsym_cleanup(void);
+extern char *kdb_strdup(const char *str, gfp_t type);
+extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
+
+/* Routine for debugging the debugger state. */
+extern void kdb_print_state(const char *, int);
+
+extern int kdb_state;
+#define KDB_STATE_KDB           0x00000001      /* Cpu is inside kdb */
+#define KDB_STATE_LEAVING       0x00000002      /* Cpu is leaving kdb */
+#define KDB_STATE_CMD           0x00000004      /* Running a kdb command */
+#define KDB_STATE_KDB_CONTROL   0x00000008      /* This cpu is under
+                                                 * kdb control */
+#define KDB_STATE_HOLD_CPU      0x00000010      /* Hold this cpu inside kdb */
+#define KDB_STATE_DOING_SS      0x00000020      /* Doing ss command */
+#define KDB_STATE_DOING_SSB     0x00000040      /* Doing ssb command,
+                                                 * DOING_SS is also set */
+#define KDB_STATE_SSBPT         0x00000080      /* Install breakpoint
+                                                 * after one ss, independent of
+                                                 * DOING_SS */
+#define KDB_STATE_REENTRY       0x00000100      /* Valid re-entry into kdb */
+#define KDB_STATE_SUPPRESS      0x00000200      /* Suppress error messages */
+#define KDB_STATE_PAGER         0x00000400      /* pager is available */
+#define KDB_STATE_GO_SWITCH     0x00000800      /* go is switching
+                                                 * back to initial cpu */
+#define KDB_STATE_PRINTF_LOCK   0x00001000      /* Holds kdb_printf lock */
+#define KDB_STATE_WAIT_IPI      0x00002000      /* Waiting for kdb_ipi() NMI */
+#define KDB_STATE_RECURSE       0x00004000      /* Recursive entry to kdb */
+#define KDB_STATE_IP_ADJUSTED   0x00008000      /* Restart IP has been
+                                                 * adjusted */
+#define KDB_STATE_GO1           0x00010000      /* go only releases one cpu */
+#define KDB_STATE_KEYBOARD      0x00020000      /* kdb entered via
+                                                 * keyboard on this cpu */
+#define KDB_STATE_KEXEC         0x00040000      /* kexec issued */
+#define KDB_STATE_DOING_KGDB    0x00080000      /* kgdb enter now issued */
+#define KDB_STATE_DOING_KGDB2   0x00100000      /* kgdb enter now issued */
+#define KDB_STATE_KGDB_TRANS    0x00200000      /* Transition to kgdb */
+#define KDB_STATE_ARCH          0xff000000      /* Reserved for arch
+                                                 * specific use */
+
+#define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
+#define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
+#define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
+
+extern int kdb_nextline; /* Current number of lines displayed */
+
+typedef struct _kdb_bp {
+        unsigned long   bp_addr;        /* Address breakpoint is present at */
+        unsigned int    bp_free:1;      /* This entry is available */
+        unsigned int    bp_enabled:1;   /* Breakpoint is active in register */
+        unsigned int    bp_type:4;      /* Uses hardware register */
+        unsigned int    bp_installed:1; /* Breakpoint is installed */
+        unsigned int    bp_delay:1;     /* Do delayed bp handling */
+        unsigned int    bp_delayed:1;   /* Delayed breakpoint */
+        unsigned int    bph_length;     /* HW break length */
+} kdb_bp_t;
+
+#ifdef CONFIG_KGDB_KDB
+extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
+
+/* The KDB shell command table */
+typedef struct _kdbtab {
+        char    *cmd_name;              /* Command name */
+        kdb_func_t cmd_func;            /* Function to execute command */
+        char    *cmd_usage;             /* Usage String for this command */
+        char    *cmd_help;              /* Help message for this command */
+        short    cmd_flags;             /* Parsing flags */
+        short    cmd_minlen;            /* Minimum legal # command
+                                         * chars required */
+        kdb_repeat_t cmd_repeat;        /* Does command auto repeat on enter? */
+} kdbtab_t;
+
+extern int kdb_bt(int, const char **);  /* KDB display back trace */
+
+/* KDB breakpoint management functions */
+extern void kdb_initbptab(void);
+extern void kdb_bp_install(struct pt_regs *);
+extern void kdb_bp_remove(void);
+
+typedef enum {
+        KDB_DB_BPT,     /* Breakpoint */
+        KDB_DB_SS,      /* Single-step trap */
+        KDB_DB_SSB,     /* Single step to branch */
+        KDB_DB_SSBPT,   /* Single step over breakpoint */
+        KDB_DB_NOBPT    /* Spurious breakpoint */
+} kdb_dbtrap_t;
+
+extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
+                         int, kdb_dbtrap_t, struct pt_regs *);
+
+/* Miscellaneous functions and data areas */
+extern int kdb_grepping_flag;
+extern char kdb_grep_string[];
+extern int kdb_grep_leading;
+extern int kdb_grep_trailing;
+extern char *kdb_cmds[];
+extern void kdb_syslog_data(char *syslog_data[]);
+extern unsigned long kdb_task_state_string(const char *);
+extern char kdb_task_state_char (const struct task_struct *);
+extern unsigned long kdb_task_state(const struct task_struct *p,
+                                    unsigned long mask);
+extern void kdb_ps_suppressed(void);
+extern void kdb_ps1(const struct task_struct *p);
+extern void kdb_print_nameval(const char *name, unsigned long val);
+extern void kdb_send_sig_info(struct task_struct *p, struct siginfo *info);
+extern void kdb_meminfo_proc_show(void);
+extern const char *kdb_walk_kallsyms(loff_t *pos);
+extern char *kdb_getstr(char *, size_t, char *);
+
+/* Defines for kdb_symbol_print */
+#define KDB_SP_SPACEB   0x0001          /* Space before string */
+#define KDB_SP_SPACEA   0x0002          /* Space after string */
+#define KDB_SP_PAREN    0x0004          /* Parenthesis around string */
+#define KDB_SP_VALUE    0x0008          /* Print the value of the address */
+#define KDB_SP_SYMSIZE  0x0010          /* Print the size of the symbol */
+#define KDB_SP_NEWLINE  0x0020          /* Newline after string */
+#define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
+
+#define KDB_TSK(cpu) kgdb_info[cpu].task
+#define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
+
+extern struct task_struct *kdb_curr_task(int);
+
+#define kdb_task_has_cpu(p) (task_curr(p))
+
+/* Simplify coexistence with NPTL */
+#define kdb_do_each_thread(g, p) do_each_thread(g, p)
+#define kdb_while_each_thread(g, p) while_each_thread(g, p)
+
+#define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
+
+extern void *debug_kmalloc(size_t size, gfp_t flags);
+extern void debug_kfree(void *);
+extern void debug_kusage(void);
+
+extern void kdb_set_current_task(struct task_struct *);
+extern struct task_struct *kdb_current_task;
+#ifdef CONFIG_MODULES
+extern struct list_head *kdb_modules;
+#endif /* CONFIG_MODULES */
+
+extern char kdb_prompt_str[];
+
+#define KDB_WORD_SIZE   ((int)sizeof(unsigned long))
+
+#endif /* CONFIG_KGDB_KDB */
+#endif  /* !_KDBPRIVATE_H */
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
new file mode 100644
index 000000000000..45344d5c53dd
--- /dev/null
+++ b/kernel/debug/kdb/kdb_support.c
@@ -0,0 +1,927 @@
+/*
+ * Kernel Debugger Architecture Independent Support Functions
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
+ * 03/02/13    added new 2.5 kallsyms <xavier.bru@bull.net>
+ */
+
+#include <stdarg.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/kallsyms.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/ptrace.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/hardirq.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/kdb.h>
+#include <linux/slab.h>
+#include "kdb_private.h"
+
+/*
+ * kdbgetsymval - Return the address of the given symbol.
+ *
+ * Parameters:
+ *      symname Character string containing symbol name
+ *      symtab  Structure to receive results
+ * Returns:
+ *      0       Symbol not found, symtab zero filled
+ *      1       Symbol mapped to module/symbol/section, data in symtab
+ */
+int kdbgetsymval(const char *symname, kdb_symtab_t *symtab)
+{
+        if (KDB_DEBUG(AR))
+                kdb_printf("kdbgetsymval: symname=%s, symtab=%p\n", symname,
+                           symtab);
+        memset(symtab, 0, sizeof(*symtab));
+        symtab->sym_start = kallsyms_lookup_name(symname);
+        if (symtab->sym_start) {
+                if (KDB_DEBUG(AR))
+                        kdb_printf("kdbgetsymval: returns 1, "
+                                   "symtab->sym_start=0x%lx\n",
+                                   symtab->sym_start);
+                return 1;
+        }
+        if (KDB_DEBUG(AR))
+                kdb_printf("kdbgetsymval: returns 0\n");
+        return 0;
+}
+EXPORT_SYMBOL(kdbgetsymval);
+
+static char *kdb_name_table[100];       /* arbitrary size */
+
+/*
+ * kdbnearsym - Return the name of the symbol with the nearest address
+ *      less than 'addr'.
+ *
+ * Parameters:
+ *      addr    Address to check for symbol near
+ *      symtab  Structure to receive results
+ * Returns:
+ *      0       No sections contain this address, symtab zero filled
+ *      1       Address mapped to module/symbol/section, data in symtab
+ * Remarks:
+ *      2.6 kallsyms has a "feature" where it unpacks the name into a
+ *      string.  If that string is reused before the caller expects it
+ *      then the caller sees its string change without warning.  To
+ *      avoid cluttering up the main kdb code with lots of kdb_strdup,
+ *      tests and kfree calls, kdbnearsym maintains an LRU list of the
+ *      last few unique strings.  The list is sized large enough to
+ *      hold active strings, no kdb caller of kdbnearsym makes more
+ *      than ~20 later calls before using a saved value.
+ */
+int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
+{
+        int ret = 0;
+        unsigned long symbolsize;
+        unsigned long offset;
+#define knt1_size 128           /* must be >= kallsyms table size */
+        char *knt1 = NULL;
+
+        if (KDB_DEBUG(AR))
+                kdb_printf("kdbnearsym: addr=0x%lx, symtab=%p\n", addr, symtab);
+        memset(symtab, 0, sizeof(*symtab));
+
+        if (addr < 4096)
+                goto out;
+        knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC);
+        if (!knt1) {
+                kdb_printf("kdbnearsym: addr=0x%lx cannot kmalloc knt1\n",
+                           addr);
+                goto out;
+        }
+        symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset,
+                                (char **)(&symtab->mod_name), knt1);
+        if (offset > 8*1024*1024) {
+                symtab->sym_name = NULL;
+                addr = offset = symbolsize = 0;
+        }
+        symtab->sym_start = addr - offset;
+        symtab->sym_end = symtab->sym_start + symbolsize;
+        ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
+
+        if (ret) {
+                int i;
+                /* Another 2.6 kallsyms "feature".  Sometimes the sym_name is
+                 * set but the buffer passed into kallsyms_lookup is not used,
+                 * so it contains garbage.  The caller has to work out which
+                 * buffer needs to be saved.
+                 *
+                 * What was Rusty smoking when he wrote that code?
+                 */
+                if (symtab->sym_name != knt1) {
+                        strncpy(knt1, symtab->sym_name, knt1_size);
+                        knt1[knt1_size-1] = '\0';
+                }
+                for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
+                        if (kdb_name_table[i] &&
+                            strcmp(kdb_name_table[i], knt1) == 0)
+                                break;
+                }
+                if (i >= ARRAY_SIZE(kdb_name_table)) {
+                        debug_kfree(kdb_name_table[0]);
+                        memcpy(kdb_name_table, kdb_name_table+1,
+                               sizeof(kdb_name_table[0]) *
+                               (ARRAY_SIZE(kdb_name_table)-1));
+                } else {
+                        debug_kfree(knt1);
+                        knt1 = kdb_name_table[i];
+                        memcpy(kdb_name_table+i, kdb_name_table+i+1,
+                               sizeof(kdb_name_table[0]) *
+                               (ARRAY_SIZE(kdb_name_table)-i-1));
+                }
+                i = ARRAY_SIZE(kdb_name_table) - 1;
+                kdb_name_table[i] = knt1;
+                symtab->sym_name = kdb_name_table[i];
+                knt1 = NULL;
+        }
+
+        if (symtab->mod_name == NULL)
+                symtab->mod_name = "kernel";
+        if (KDB_DEBUG(AR))
+                kdb_printf("kdbnearsym: returns %d symtab->sym_start=0x%lx, "
+                   "symtab->mod_name=%p, symtab->sym_name=%p (%s)\n", ret,
+                   symtab->sym_start, symtab->mod_name, symtab->sym_name,
+                   symtab->sym_name);
+
+out:
+        debug_kfree(knt1);
+        return ret;
+}
+
+void kdbnearsym_cleanup(void)
+{
+        int i;
+        for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
+                if (kdb_name_table[i]) {
+                        debug_kfree(kdb_name_table[i]);
+                        kdb_name_table[i] = NULL;
+                }
+        }
+}
+
+static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1];
+
+/*
+ * kallsyms_symbol_complete
+ *
+ * Parameters:
+ *      prefix_name     prefix of a symbol name to lookup
+ *      max_len         maximum length that can be returned
+ * Returns:
+ *      Number of symbols which match the given prefix.
+ * Notes:
+ *      prefix_name is changed to contain the longest unique prefix that
+ *      starts with this prefix (tab completion).
+ */
+int kallsyms_symbol_complete(char *prefix_name, int max_len)
+{
+        loff_t pos = 0;
+        int prefix_len = strlen(prefix_name), prev_len = 0;
+        int i, number = 0;
+        const char *name;
+
+        while ((name = kdb_walk_kallsyms(&pos))) {
+                if (strncmp(name, prefix_name, prefix_len) == 0) {
+                        strcpy(ks_namebuf, name);
+                        /* Work out the longest name that matches the prefix */
+                        if (++number == 1) {
+                                prev_len = min_t(int, max_len-1,
+                                                 strlen(ks_namebuf));
+                                memcpy(ks_namebuf_prev, ks_namebuf, prev_len);
+                                ks_namebuf_prev[prev_len] = '\0';
+                                continue;
+                        }
+                        for (i = 0; i < prev_len; i++) {
+                                if (ks_namebuf[i] != ks_namebuf_prev[i]) {
+                                        prev_len = i;
+                                        ks_namebuf_prev[i] = '\0';
+                                        break;
+                                }
+                        }
+                }
+        }
+        if (prev_len > prefix_len)
+                memcpy(prefix_name, ks_namebuf_prev, prev_len+1);
+        return number;
+}
+
+/*
+ * kallsyms_symbol_next
+ *
+ * Parameters:
+ *      prefix_name     prefix of a symbol name to lookup
+ *      flag    0 means search from the head, 1 means continue search.
+ * Returns:
+ *      1 if a symbol matches the given prefix.
+ *      0 if no string found
+ */
+int kallsyms_symbol_next(char *prefix_name, int flag)
+{
+        int prefix_len = strlen(prefix_name);
+        static loff_t pos;
+        const char *name;
+
+        if (!flag)
+                pos = 0;
+
+        while ((name = kdb_walk_kallsyms(&pos))) {
+                if (strncmp(name, prefix_name, prefix_len) == 0) {
+                        strncpy(prefix_name, name, strlen(name)+1);
+                        return 1;
+                }
+        }
+        return 0;
+}
+
+/*
+ * kdb_symbol_print - Standard method for printing a symbol name and offset.
+ * Inputs:
+ *      addr    Address to be printed.
+ *      symtab  Address of symbol data, if NULL this routine does its
+ *              own lookup.
+ *      punc    Punctuation for string, bit field.
+ * Remarks:
+ *      The string and its punctuation is only printed if the address
+ *      is inside the kernel, except that the value is always printed
+ *      when requested.
+ */
+void kdb_symbol_print(unsigned long addr, const kdb_symtab_t *symtab_p,
+                      unsigned int punc)
+{
+        kdb_symtab_t symtab, *symtab_p2;
+        if (symtab_p) {
+                symtab_p2 = (kdb_symtab_t *)symtab_p;
+        } else {
+                symtab_p2 = &symtab;
+                kdbnearsym(addr, symtab_p2);
+        }
+        if (!(symtab_p2->sym_name || (punc & KDB_SP_VALUE)))
+                return;
+        if (punc & KDB_SP_SPACEB)
+                kdb_printf(" ");
+        if (punc & KDB_SP_VALUE)
+                kdb_printf(kdb_machreg_fmt0, addr);
+        if (symtab_p2->sym_name) {
+                if (punc & KDB_SP_VALUE)
+                        kdb_printf(" ");
+                if (punc & KDB_SP_PAREN)
+                        kdb_printf("(");
+                if (strcmp(symtab_p2->mod_name, "kernel"))
+                        kdb_printf("[%s]", symtab_p2->mod_name);
+                kdb_printf("%s", symtab_p2->sym_name);
+                if (addr != symtab_p2->sym_start)
+                        kdb_printf("+0x%lx", addr - symtab_p2->sym_start);
+                if (punc & KDB_SP_SYMSIZE)
+                        kdb_printf("/0x%lx",
+                                   symtab_p2->sym_end - symtab_p2->sym_start);
+                if (punc & KDB_SP_PAREN)
+                        kdb_printf(")");
+        }
+        if (punc & KDB_SP_SPACEA)
+                kdb_printf(" ");
+        if (punc & KDB_SP_NEWLINE)
+                kdb_printf("\n");
+}
+
+/*
+ * kdb_strdup - kdb equivalent of strdup, for disasm code.
+ * Inputs:
+ *      str     The string to duplicate.
+ *      type    Flags to kmalloc for the new string.
+ * Returns:
+ *      Address of the new string, NULL if storage could not be allocated.
+ * Remarks:
+ *      This is not in lib/string.c because it uses kmalloc which is not
+ *      available when string.o is used in boot loaders.
+ */
+char *kdb_strdup(const char *str, gfp_t type)
+{
+        int n = strlen(str)+1;
+        char *s = kmalloc(n, type);
+        if (!s)
+                return NULL;
+        return strcpy(s, str);
+}
+
+/*
+ * kdb_getarea_size - Read an area of data.  The kdb equivalent of
+ *      copy_from_user, with kdb messages for invalid addresses.
+ * Inputs:
+ *      res     Pointer to the area to receive the result.
+ *      addr    Address of the area to copy.
+ *      size    Size of the area.
+ * Returns:
+ *      0 for success, < 0 for error.
+ */
+int kdb_getarea_size(void *res, unsigned long addr, size_t size)
+{
+        int ret = probe_kernel_read((char *)res, (char *)addr, size);
+        if (ret) {
+                if (!KDB_STATE(SUPPRESS)) {
+                        kdb_printf("kdb_getarea: Bad address 0x%lx\n", addr);
+                        KDB_STATE_SET(SUPPRESS);
+                }
+                ret = KDB_BADADDR;
+        } else {
+                KDB_STATE_CLEAR(SUPPRESS);
+        }
+        return ret;
+}
+
+/*
+ * kdb_putarea_size - Write an area of data.  The kdb equivalent of
+ *      copy_to_user, with kdb messages for invalid addresses.
+ * Inputs:
+ *      addr    Address of the area to write to.
+ *      res     Pointer to the area holding the data.
+ *      size    Size of the area.
+ * Returns:
+ *      0 for success, < 0 for error.
+ */
+int kdb_putarea_size(unsigned long addr, void *res, size_t size)
+{
+        int ret = probe_kernel_read((char *)addr, (char *)res, size);
+        if (ret) {
+                if (!KDB_STATE(SUPPRESS)) {
+                        kdb_printf("kdb_putarea: Bad address 0x%lx\n", addr);
+                        KDB_STATE_SET(SUPPRESS);
+                }
+                ret = KDB_BADADDR;
+        } else {
+                KDB_STATE_CLEAR(SUPPRESS);
+        }
+        return ret;
+}
+
+/*
+ * kdb_getphys - Read data from a physical address. Validate the
+ *      address is in range, use kmap_atomic() to get data
+ *      similar to kdb_getarea() - but for phys addresses
+ * Inputs:
+ *      res     Pointer to the word to receive the result
+ *      addr    Physical address of the area to copy
+ *      size    Size of the area
+ * Returns:
+ *      0 for success, < 0 for error.
+ */
+static int kdb_getphys(void *res, unsigned long addr, size_t size)
+{
+        unsigned long pfn;
+        void *vaddr;
+        struct page *page;
+
+        pfn = (addr >> PAGE_SHIFT);
+        if (!pfn_valid(pfn))
+                return 1;
+        page = pfn_to_page(pfn);
+        vaddr = kmap_atomic(page, KM_KDB);
+        memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size);
+        kunmap_atomic(vaddr, KM_KDB);
+
+        return 0;
+}
+
+/*
+ * kdb_getphysword
+ * Inputs:
+ *      word    Pointer to the word to receive the result.
+ *      addr    Address of the area to copy.
+ *      size    Size of the area.
+ * Returns:
+ *      0 for success, < 0 for error.
+ */
+int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size)
+{
+        int diag;
+        __u8  w1;
+        __u16 w2;
+        __u32 w4;
+        __u64 w8;
+        *word = 0;      /* Default value if addr or size is invalid */
+
+        switch (size) {
+        case 1:
+                diag = kdb_getphys(&w1, addr, sizeof(w1));
+                if (!diag)
+                        *word = w1;
+                break;
+        case 2:
+                diag = kdb_getphys(&w2, addr, sizeof(w2));
+                if (!diag)
+                        *word = w2;
+                break;
+        case 4:
+                diag = kdb_getphys(&w4, addr, sizeof(w4));
+                if (!diag)
+                        *word = w4;
+                break;
+        case 8:
+                if (size <= sizeof(*word)) {
+                        diag = kdb_getphys(&w8, addr, sizeof(w8));
+                        if (!diag)
+                                *word = w8;
+                        break;
+                }
+                /* drop through */
+        default:
+                diag = KDB_BADWIDTH;
+                kdb_printf("kdb_getphysword: bad width %ld\n", (long) size);
+        }
+        return diag;
+}
+
+/*
+ * kdb_getword - Read a binary value.  Unlike kdb_getarea, this treats
+ *      data as numbers.
+ * Inputs:
+ *      word    Pointer to the word to receive the result.
+ *      addr    Address of the area to copy.
+ *      size    Size of the area.
+ * Returns:
+ *      0 for success, < 0 for error.
+ */
+int kdb_getword(unsigned long *word, unsigned long addr, size_t size)
+{
+        int diag;
+        __u8  w1;
+        __u16 w2;
+        __u32 w4;
+        __u64 w8;
+        *word = 0;      /* Default value if addr or size is invalid */
+        switch (size) {
+        case 1:
+                diag = kdb_getarea(w1, addr);
+                if (!diag)
+                        *word = w1;
+                break;
+        case 2:
+                diag = kdb_getarea(w2, addr);
+                if (!diag)
+                        *word = w2;
+                break;
+        case 4:
+                diag = kdb_getarea(w4, addr);
+                if (!diag)
+                        *word = w4;
+                break;
+        case 8:
+                if (size <= sizeof(*word)) {
+                        diag = kdb_getarea(w8, addr);
+                        if (!diag)
+                                *word = w8;
+                        break;
+                }
+                /* drop through */
+        default:
+                diag = KDB_BADWIDTH;
+                kdb_printf("kdb_getword: bad width %ld\n", (long) size);
+        }
+        return diag;
+}
+
+/*
+ * kdb_putword - Write a binary value.  Unlike kdb_putarea, this
+ *      treats data as numbers.
+ * Inputs:
+ *      addr    Address of the area to write to..
+ *      word    The value to set.
+ *      size    Size of the area.
+ * Returns:
+ *      0 for success, < 0 for error.
+ */
+int kdb_putword(unsigned long addr, unsigned long word, size_t size)
+{
+        int diag;
+        __u8  w1;
+        __u16 w2;
+        __u32 w4;
+        __u64 w8;
+        switch (size) {
+        case 1:
+                w1 = word;
+                diag = kdb_putarea(addr, w1);
+                break;
+        case 2:
+                w2 = word;
+                diag = kdb_putarea(addr, w2);
+                break;
+        case 4:
+                w4 = word;
+                diag = kdb_putarea(addr, w4);
+                break;
+        case 8:
+                if (size <= sizeof(word)) {
+                        w8 = word;
+                        diag = kdb_putarea(addr, w8);
+                        break;
+                }
+                /* drop through */
+        default:
+                diag = KDB_BADWIDTH;
+                kdb_printf("kdb_putword: bad width %ld\n", (long) size);
+        }
+        return diag;
+}
+
+/*
+ * kdb_task_state_string - Convert a string containing any of the
+ *      letters DRSTCZEUIMA to a mask for the process state field and
+ *      return the value.  If no argument is supplied, return the mask
+ *      that corresponds to environment variable PS, DRSTCZEU by
+ *      default.
+ * Inputs:
+ *      s       String to convert
+ * Returns:
+ *      Mask for process state.
+ * Notes:
+ *      The mask folds data from several sources into a single long value, so
+ *      be carefull not to overlap the bits.  TASK_* bits are in the LSB,
+ *      special cases like UNRUNNABLE are in the MSB.  As of 2.6.10-rc1 there
+ *      is no overlap between TASK_* and EXIT_* but that may not always be
+ *      true, so EXIT_* bits are shifted left 16 bits before being stored in
+ *      the mask.
+ */
+
+/* unrunnable is < 0 */
+#define UNRUNNABLE      (1UL << (8*sizeof(unsigned long) - 1))
+#define RUNNING         (1UL << (8*sizeof(unsigned long) - 2))
+#define IDLE            (1UL << (8*sizeof(unsigned long) - 3))
+#define DAEMON          (1UL << (8*sizeof(unsigned long) - 4))
+
+unsigned long kdb_task_state_string(const char *s)
+{
+        long res = 0;
+        if (!s) {
+                s = kdbgetenv("PS");
+                if (!s)
+                        s = "DRSTCZEU"; /* default value for ps */
+        }
+        while (*s) {
+                switch (*s) {
+                case 'D':
+                        res |= TASK_UNINTERRUPTIBLE;
+                        break;
+                case 'R':
+                        res |= RUNNING;
+                        break;
+                case 'S':
+                        res |= TASK_INTERRUPTIBLE;
+                        break;
+                case 'T':
+                        res |= TASK_STOPPED;
+                        break;
+                case 'C':
+                        res |= TASK_TRACED;
+                        break;
+                case 'Z':
+                        res |= EXIT_ZOMBIE << 16;
+                        break;
+                case 'E':
+                        res |= EXIT_DEAD << 16;
+                        break;
+                case 'U':
+                        res |= UNRUNNABLE;
+                        break;
+                case 'I':
+                        res |= IDLE;
+                        break;
+                case 'M':
+                        res |= DAEMON;
+                        break;
+                case 'A':
+                        res = ~0UL;
+                        break;
+                default:
+                          kdb_printf("%s: unknown flag '%c' ignored\n",
+                                     __func__, *s);
+                          break;
+                }
+                ++s;
+        }
+        return res;
+}
+
+/*
+ * kdb_task_state_char - Return the character that represents the task state.
+ * Inputs:
+ *      p       struct task for the process
+ * Returns:
+ *      One character to represent the task state.
+ */
+char kdb_task_state_char (const struct task_struct *p)
+{
+        int cpu;
+        char state;
+        unsigned long tmp;
+
+        if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
+                return 'E';
+
+        cpu = kdb_process_cpu(p);
+        state = (p->state == 0) ? 'R' :
+                (p->state < 0) ? 'U' :
+                (p->state & TASK_UNINTERRUPTIBLE) ? 'D' :
+                (p->state & TASK_STOPPED) ? 'T' :
+                (p->state & TASK_TRACED) ? 'C' :
+                (p->exit_state & EXIT_ZOMBIE) ? 'Z' :
+                (p->exit_state & EXIT_DEAD) ? 'E' :
+                (p->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
+        if (p->pid == 0) {
+                /* Idle task.  Is it really idle, apart from the kdb
+                 * interrupt? */
+                if (!kdb_task_has_cpu(p) || kgdb_info[cpu].irq_depth == 1) {
+                        if (cpu != kdb_initial_cpu)
+                                state = 'I';    /* idle task */
+                }
+        } else if (!p->mm && state == 'S') {
+                state = 'M';    /* sleeping system daemon */
+        }
+        return state;
+}
+
+/*
+ * kdb_task_state - Return true if a process has the desired state
+ *      given by the mask.
+ * Inputs:
+ *      p       struct task for the process
+ *      mask    mask from kdb_task_state_string to select processes
+ * Returns:
+ *      True if the process matches at least one criteria defined by the mask.
+ */
+unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
+{
+        char state[] = { kdb_task_state_char(p), '\0' };
+        return (mask & kdb_task_state_string(state)) != 0;
+}
+
+/*
+ * kdb_print_nameval - Print a name and its value, converting the
+ *      value to a symbol lookup if possible.
+ * Inputs:
+ *      name    field name to print
+ *      val     value of field
+ */
+void kdb_print_nameval(const char *name, unsigned long val)
+{
+        kdb_symtab_t symtab;
+        kdb_printf("  %-11.11s ", name);
+        if (kdbnearsym(val, &symtab))
+                kdb_symbol_print(val, &symtab,
+                                 KDB_SP_VALUE|KDB_SP_SYMSIZE|KDB_SP_NEWLINE);
+        else
+                kdb_printf("0x%lx\n", val);
+}
+
+/* Last ditch allocator for debugging, so we can still debug even when
+ * the GFP_ATOMIC pool has been exhausted.  The algorithms are tuned
+ * for space usage, not for speed.  One smallish memory pool, the free
+ * chain is always in ascending address order to allow coalescing,
+ * allocations are done in brute force best fit.
+ */
+
+struct debug_alloc_header {
+        u32 next;       /* offset of next header from start of pool */
+        u32 size;
+        void *caller;
+};
+
+/* The memory returned by this allocator must be aligned, which means
+ * so must the header size.  Do not assume that sizeof(struct
+ * debug_alloc_header) is a multiple of the alignment, explicitly
+ * calculate the overhead of this header, including the alignment.
+ * The rest of this code must not use sizeof() on any header or
+ * pointer to a header.
+ */
+#define dah_align 8
+#define dah_overhead ALIGN(sizeof(struct debug_alloc_header), dah_align)
+
+static u64 debug_alloc_pool_aligned[256*1024/dah_align];        /* 256K pool */
+static char *debug_alloc_pool = (char *)debug_alloc_pool_aligned;
+static u32 dah_first, dah_first_call = 1, dah_used, dah_used_max;
+
+/* Locking is awkward.  The debug code is called from all contexts,
+ * including non maskable interrupts.  A normal spinlock is not safe
+ * in NMI context.  Try to get the debug allocator lock, if it cannot
+ * be obtained after a second then give up.  If the lock could not be
+ * previously obtained on this cpu then only try once.
+ *
+ * sparse has no annotation for "this function _sometimes_ acquires a
+ * lock", so fudge the acquire/release notation.
+ */
+static DEFINE_SPINLOCK(dap_lock);
+static int get_dap_lock(void)
+        __acquires(dap_lock)
+{
+        static int dap_locked = -1;
+        int count;
+        if (dap_locked == smp_processor_id())
+                count = 1;
+        else
+                count = 1000;
+        while (1) {
+                if (spin_trylock(&dap_lock)) {
+                        dap_locked = -1;
+                        return 1;
+                }
+                if (!count--)
+                        break;
+                udelay(1000);
+        }
+        dap_locked = smp_processor_id();
+        __acquire(dap_lock);
+        return 0;
+}
+
+void *debug_kmalloc(size_t size, gfp_t flags)
+{
+        unsigned int rem, h_offset;
+        struct debug_alloc_header *best, *bestprev, *prev, *h;
+        void *p = NULL;
+        if (!get_dap_lock()) {
+                __release(dap_lock);    /* we never actually got it */
+                return NULL;
+        }
+        h = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
+        if (dah_first_call) {
+                h->size = sizeof(debug_alloc_pool_aligned) - dah_overhead;
+                dah_first_call = 0;
+        }
+        size = ALIGN(size, dah_align);
+        prev = best = bestprev = NULL;
+        while (1) {
+                if (h->size >= size && (!best || h->size < best->size)) {
+                        best = h;
+                        bestprev = prev;
+                        if (h->size == size)
+                                break;
+                }
+                if (!h->next)
+                        break;
+                prev = h;
+                h = (struct debug_alloc_header *)(debug_alloc_pool + h->next);
+        }
+        if (!best)
+                goto out;
+        rem = best->size - size;
+        /* The pool must always contain at least one header */
+        if (best->next == 0 && bestprev == NULL && rem < dah_overhead)
+                goto out;
+        if (rem >= dah_overhead) {
+                best->size = size;
+                h_offset = ((char *)best - debug_alloc_pool) +
+                           dah_overhead + best->size;
+                h = (struct debug_alloc_header *)(debug_alloc_pool + h_offset);
+                h->size = rem - dah_overhead;
+                h->next = best->next;
+        } else
+                h_offset = best->next;
+        best->caller = __builtin_return_address(0);
+        dah_used += best->size;
+        dah_used_max = max(dah_used, dah_used_max);
+        if (bestprev)
+                bestprev->next = h_offset;
+        else
+                dah_first = h_offset;
+        p = (char *)best + dah_overhead;
+        memset(p, POISON_INUSE, best->size - 1);
+        *((char *)p + best->size - 1) = POISON_END;
+out:
+        spin_unlock(&dap_lock);
+        return p;
+}
+
+void debug_kfree(void *p)
+{
+        struct debug_alloc_header *h;
+        unsigned int h_offset;
+        if (!p)
+                return;
+        if ((char *)p < debug_alloc_pool ||
+            (char *)p >= debug_alloc_pool + sizeof(debug_alloc_pool_aligned)) {
+                kfree(p);
+                return;
+        }
+        if (!get_dap_lock()) {
+                __release(dap_lock);    /* we never actually got it */
+                return;         /* memory leak, cannot be helped */
+        }
+        h = (struct debug_alloc_header *)((char *)p - dah_overhead);
+        memset(p, POISON_FREE, h->size - 1);
+        *((char *)p + h->size - 1) = POISON_END;
+        h->caller = NULL;
+        dah_used -= h->size;
+        h_offset = (char *)h - debug_alloc_pool;
+        if (h_offset < dah_first) {
+                h->next = dah_first;
+                dah_first = h_offset;
+        } else {
+                struct debug_alloc_header *prev;
+                unsigned int prev_offset;
+                prev = (struct debug_alloc_header *)(debug_alloc_pool +
+                                                     dah_first);
+                while (1) {
+                        if (!prev->next || prev->next > h_offset)
+                                break;
+                        prev = (struct debug_alloc_header *)
+                                (debug_alloc_pool + prev->next);
+                }
+                prev_offset = (char *)prev - debug_alloc_pool;
+                if (prev_offset + dah_overhead + prev->size == h_offset) {
+                        prev->size += dah_overhead + h->size;
+                        memset(h, POISON_FREE, dah_overhead - 1);
+                        *((char *)h + dah_overhead - 1) = POISON_END;
+                        h = prev;
+                        h_offset = prev_offset;
+                } else {
+                        h->next = prev->next;
+                        prev->next = h_offset;
+                }
+        }
+        if (h_offset + dah_overhead + h->size == h->next) {
+                struct debug_alloc_header *next;
+                next = (struct debug_alloc_header *)
+                        (debug_alloc_pool + h->next);
+                h->size += dah_overhead + next->size;
+                h->next = next->next;
+                memset(next, POISON_FREE, dah_overhead - 1);
+                *((char *)next + dah_overhead - 1) = POISON_END;
+        }
+        spin_unlock(&dap_lock);
+}
+
+void debug_kusage(void)
+{
+        struct debug_alloc_header *h_free, *h_used;
+#ifdef  CONFIG_IA64
+        /* FIXME: using dah for ia64 unwind always results in a memory leak.
+         * Fix that memory leak first, then set debug_kusage_one_time = 1 for
+         * all architectures.
+         */
+        static int debug_kusage_one_time;
+#else
+        static int debug_kusage_one_time = 1;
+#endif
+        if (!get_dap_lock()) {
+                __release(dap_lock);    /* we never actually got it */
+                return;
+        }
+        h_free = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
+        if (dah_first == 0 &&
+            (h_free->size == sizeof(debug_alloc_pool_aligned) - dah_overhead ||
+             dah_first_call))
+                goto out;
+        if (!debug_kusage_one_time)
+                goto out;
+        debug_kusage_one_time = 0;
+        kdb_printf("%s: debug_kmalloc memory leak dah_first %d\n",
+                   __func__, dah_first);
+        if (dah_first) {
+                h_used = (struct debug_alloc_header *)debug_alloc_pool;
+                kdb_printf("%s: h_used %p size %d\n", __func__, h_used,
+                           h_used->size);
+        }
+        do {
+                h_used = (struct debug_alloc_header *)
+                          ((char *)h_free + dah_overhead + h_free->size);
+                kdb_printf("%s: h_used %p size %d caller %p\n",
+                           __func__, h_used, h_used->size, h_used->caller);
+                h_free = (struct debug_alloc_header *)
+                          (debug_alloc_pool + h_free->next);
+        } while (h_free->next);
+        h_used = (struct debug_alloc_header *)
+                  ((char *)h_free + dah_overhead + h_free->size);
+        if ((char *)h_used - debug_alloc_pool !=
+            sizeof(debug_alloc_pool_aligned))
+                kdb_printf("%s: h_used %p size %d caller %p\n",
+                           __func__, h_used, h_used->size, h_used->caller);
+out:
+        spin_unlock(&dap_lock);
+}
+
+/* Maintain a small stack of kdb_flags to allow recursion without disturbing
+ * the global kdb state.
+ */
+
+static int kdb_flags_stack[4], kdb_flags_index;
+
+void kdb_save_flags(void)
+{
+        BUG_ON(kdb_flags_index >= ARRAY_SIZE(kdb_flags_stack));
+        kdb_flags_stack[kdb_flags_index++] = kdb_flags;
+}
+
+void kdb_restore_flags(void)
+{
+        BUG_ON(kdb_flags_index <= 0);
+        kdb_flags = kdb_flags_stack[--kdb_flags_index];
+}
diff --git a/kernel/groups.c b/kernel/groups.c
index 2b45b2ee3964..53b1916c9492 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -164,12 +164,6 @@ int groups_search(const struct group_info *group_info, gid_t grp)
  */
 int set_groups(struct cred *new, struct group_info *group_info)
 {
-        int retval;
-
-        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);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 0086628b6e97..b9b134b35088 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1749,35 +1749,15 @@ void __init hrtimers_init(void)
 }
 
 /**
- * schedule_hrtimeout_range - sleep until timeout
+ * schedule_hrtimeout_range_clock - sleep until timeout
  * @expires:    timeout value (ktime_t)
  * @delta:      slack in expires timeout (ktime_t)
  * @mode:       timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
- *
- * Make the current task sleep until the given expiry time has
- * elapsed. The routine will return immediately unless
- * the current task state has been set (see set_current_state()).
- *
- * The @delta argument gives the kernel the freedom to schedule the
- * actual wakeup to a time that is both power and performance friendly.
- * The kernel give the normal best effort behavior for "@expires+@delta",
- * but may decide to fire the timer earlier, but no earlier than @expires.
- *
- * You can set the task state as follows -
- *
- * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
- * pass before the routine returns.
- *
- * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
- * delivered to the current task.
- *
- * The current task state is guaranteed to be TASK_RUNNING when this
- * routine returns.
- *
- * Returns 0 when the timer has expired otherwise -EINTR
+ * @clock:      timer clock, CLOCK_MONOTONIC or CLOCK_REALTIME
  */
-int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
-                               const enum hrtimer_mode mode)
+int __sched
+schedule_hrtimeout_range_clock(ktime_t *expires, unsigned long delta,
+                               const enum hrtimer_mode mode, int clock)
 {
         struct hrtimer_sleeper t;
 
@@ -1799,7 +1779,7 @@ int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
                 return -EINTR;
         }
 
-        hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, mode);
+        hrtimer_init_on_stack(&t.timer, clock, mode);
         hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
 
         hrtimer_init_sleeper(&t, current);
@@ -1818,6 +1798,41 @@ int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
 
         return !t.task ? 0 : -EINTR;
 }
+
+/**
+ * schedule_hrtimeout_range - sleep until timeout
+ * @expires:    timeout value (ktime_t)
+ * @delta:      slack in expires timeout (ktime_t)
+ * @mode:       timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
+ *
+ * Make the current task sleep until the given expiry time has
+ * elapsed. The routine will return immediately unless
+ * the current task state has been set (see set_current_state()).
+ *
+ * The @delta argument gives the kernel the freedom to schedule the
+ * actual wakeup to a time that is both power and performance friendly.
+ * The kernel give the normal best effort behavior for "@expires+@delta",
+ * but may decide to fire the timer earlier, but no earlier than @expires.
+ *
+ * You can set the task state as follows -
+ *
+ * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
+ * pass before the routine returns.
+ *
+ * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
+ * delivered to the current task.
+ *
+ * The current task state is guaranteed to be TASK_RUNNING when this
+ * routine returns.
+ *
+ * Returns 0 when the timer has expired otherwise -EINTR
+ */
+int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
+                                     const enum hrtimer_mode mode)
+{
+        return schedule_hrtimeout_range_clock(expires, delta, mode,
+                                              CLOCK_MONOTONIC);
+}
 EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);
 
 /**
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 76d5a671bfe1..27e5c6911223 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -370,9 +370,6 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
         irqreturn_t ret, retval = IRQ_NONE;
         unsigned int status = 0;
 
-        if (!(action->flags & IRQF_DISABLED))
-                local_irq_enable_in_hardirq();
-
         do {
                 trace_irq_handler_entry(irq, action);
                 ret = action->handler(irq, action->dev_id);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 704e488730a5..3164ba7ce151 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -138,6 +138,22 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
         return 0;
 }
 
+int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        unsigned long flags;
+
+        if (!desc)
+                return -EINVAL;
+
+        raw_spin_lock_irqsave(&desc->lock, flags);
+        desc->affinity_hint = m;
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
+
 #ifndef CONFIG_AUTO_IRQ_AFFINITY
 /*
  * Generic version of the affinity autoselector.
@@ -757,16 +773,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                 if (new->flags & IRQF_ONESHOT)
                         desc->status |= IRQ_ONESHOT;
 
-                /*
-                 * Force MSI interrupts to run with interrupts
-                 * disabled. The multi vector cards can cause stack
-                 * overflows due to nested interrupts when enough of
-                 * them are directed to a core and fire at the same
-                 * time.
-                 */
-                if (desc->msi_desc)
-                        new->flags |= IRQF_DISABLED;
-
                 if (!(desc->status & IRQ_NOAUTOEN)) {
                         desc->depth = 0;
                         desc->status &= ~IRQ_DISABLED;
@@ -916,6 +922,12 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
                         desc->chip->disable(irq);
         }
 
+#ifdef CONFIG_SMP
+        /* make sure affinity_hint is cleaned up */
+        if (WARN_ON_ONCE(desc->affinity_hint))
+                desc->affinity_hint = NULL;
+#endif
+
         raw_spin_unlock_irqrestore(&desc->lock, flags);
 
         unregister_handler_proc(irq, action);
@@ -1027,7 +1039,6 @@ EXPORT_SYMBOL(free_irq);
  *      Flags:
  *
  *      IRQF_SHARED             Interrupt is shared
- *      IRQF_DISABLED   Disable local interrupts while processing
  *      IRQF_SAMPLE_RANDOM      The interrupt can be used for entropy
  *      IRQF_TRIGGER_*          Specify active edge(s) or level
  *
@@ -1041,25 +1052,6 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
         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:
-         */
-        irqflags |= IRQF_DISABLED;
-#endif
-        /*
          * Sanity-check: shared interrupts must pass in a real dev-ID,
          * otherwise we'll have trouble later trying to figure out
          * which interrupt is which (messes up the interrupt freeing
@@ -1120,3 +1112,40 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
         return retval;
 }
 EXPORT_SYMBOL(request_threaded_irq);
+
+/**
+ *      request_any_context_irq - allocate an interrupt line
+ *      @irq: Interrupt line to allocate
+ *      @handler: Function to be called when the IRQ occurs.
+ *                Threaded handler for threaded interrupts.
+ *      @flags: Interrupt type flags
+ *      @name: An ascii name for the claiming device
+ *      @dev_id: A cookie passed back to the handler function
+ *
+ *      This call allocates interrupt resources and enables the
+ *      interrupt line and IRQ handling. It selects either a
+ *      hardirq or threaded handling method depending on the
+ *      context.
+ *
+ *      On failure, it returns a negative value. On success,
+ *      it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
+ */
+int request_any_context_irq(unsigned int irq, irq_handler_t handler,
+                            unsigned long flags, const char *name, void *dev_id)
+{
+        struct irq_desc *desc = irq_to_desc(irq);
+        int ret;
+
+        if (!desc)
+                return -EINVAL;
+
+        if (desc->status & IRQ_NESTED_THREAD) {
+                ret = request_threaded_irq(irq, NULL, handler,
+                                           flags, name, dev_id);
+                return !ret ? IRQC_IS_NESTED : ret;
+        }
+
+        ret = request_irq(irq, handler, flags, name, dev_id);
+        return !ret ? IRQC_IS_HARDIRQ : ret;
+}
+EXPORT_SYMBOL_GPL(request_any_context_irq);
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 7a6eb04ef6b5..09a2ee540bd2 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -32,6 +32,27 @@ static int irq_affinity_proc_show(struct seq_file *m, void *v)
         return 0;
 }
 
+static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
+{
+        struct irq_desc *desc = irq_to_desc((long)m->private);
+        unsigned long flags;
+        cpumask_var_t mask;
+
+        if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
+                return -ENOMEM;
+
+        raw_spin_lock_irqsave(&desc->lock, flags);
+        if (desc->affinity_hint)
+                cpumask_copy(mask, desc->affinity_hint);
+        raw_spin_unlock_irqrestore(&desc->lock, flags);
+
+        seq_cpumask(m, mask);
+        seq_putc(m, '\n');
+        free_cpumask_var(mask);
+
+        return 0;
+}
+
 #ifndef is_affinity_mask_valid
 #define is_affinity_mask_valid(val) 1
 #endif
@@ -84,6 +105,11 @@ static int irq_affinity_proc_open(struct inode *inode, struct file *file)
         return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
 }
 
+static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data);
+}
+
 static const struct file_operations irq_affinity_proc_fops = {
         .open           = irq_affinity_proc_open,
         .read           = seq_read,
@@ -92,6 +118,13 @@ static const struct file_operations irq_affinity_proc_fops = {
         .write          = irq_affinity_proc_write,
 };
 
+static const struct file_operations irq_affinity_hint_proc_fops = {
+        .open           = irq_affinity_hint_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static int default_affinity_show(struct seq_file *m, void *v)
 {
         seq_cpumask(m, irq_default_affinity);
@@ -147,6 +180,26 @@ static const struct file_operations default_affinity_proc_fops = {
         .release        = single_release,
         .write          = default_affinity_write,
 };
+
+static int irq_node_proc_show(struct seq_file *m, void *v)
+{
+        struct irq_desc *desc = irq_to_desc((long) m->private);
+
+        seq_printf(m, "%d\n", desc->node);
+        return 0;
+}
+
+static int irq_node_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, irq_node_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations irq_node_proc_fops = {
+        .open           = irq_node_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
 #endif
 
 static int irq_spurious_proc_show(struct seq_file *m, void *v)
@@ -231,6 +284,13 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
         /* create /proc/irq/<irq>/smp_affinity */
         proc_create_data("smp_affinity", 0600, desc->dir,
                          &irq_affinity_proc_fops, (void *)(long)irq);
+
+        /* create /proc/irq/<irq>/affinity_hint */
+        proc_create_data("affinity_hint", 0400, desc->dir,
+                         &irq_affinity_hint_proc_fops, (void *)(long)irq);
+
+        proc_create_data("node", 0444, desc->dir,
+                         &irq_node_proc_fops, (void *)(long)irq);
 #endif
 
         proc_create_data("spurious", 0444, desc->dir,
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 13aff293f4de..6f6d091b5757 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/seq_file.h>
 #include <linux/fs.h>
+#include <linux/kdb.h>
 #include <linux/err.h>
 #include <linux/proc_fs.h>
 #include <linux/sched.h>        /* for cond_resched */
@@ -516,6 +517,26 @@ static int kallsyms_open(struct inode *inode, struct file *file)
         return ret;
 }
 
+#ifdef  CONFIG_KGDB_KDB
+const char *kdb_walk_kallsyms(loff_t *pos)
+{
+        static struct kallsym_iter kdb_walk_kallsyms_iter;
+        if (*pos == 0) {
+                memset(&kdb_walk_kallsyms_iter, 0,
+                       sizeof(kdb_walk_kallsyms_iter));
+                reset_iter(&kdb_walk_kallsyms_iter, 0);
+        }
+        while (1) {
+                if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
+                        return NULL;
+                ++*pos;
+                /* Some debugging symbols have no name.  Ignore them. */
+                if (kdb_walk_kallsyms_iter.name[0])
+                        return kdb_walk_kallsyms_iter.name;
+        }
+}
+#endif  /* CONFIG_KGDB_KDB */
+
 static const struct file_operations kallsyms_operations = {
         .open = kallsyms_open,
         .read = seq_read,
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
deleted file mode 100644
index 11f3515ca83f..000000000000
--- a/kernel/kgdb.c
+++ /dev/null
@@ -1,1764 +0,0 @@
-/*
- * KGDB stub.
- *
- * Maintainer: Jason Wessel <jason.wessel@windriver.com>
- *
- * Copyright (C) 2000-2001 VERITAS Software Corporation.
- * Copyright (C) 2002-2004 Timesys Corporation
- * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
- * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
- * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
- * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
- * Copyright (C) 2005-2008 Wind River Systems, Inc.
- * Copyright (C) 2007 MontaVista Software, Inc.
- * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- *
- * Contributors at various stages not listed above:
- *  Jason Wessel ( jason.wessel@windriver.com )
- *  George Anzinger <george@mvista.com>
- *  Anurekh Saxena (anurekh.saxena@timesys.com)
- *  Lake Stevens Instrument Division (Glenn Engel)
- *  Jim Kingdon, Cygnus Support.
- *
- * Original KGDB stub: David Grothe <dave@gcom.com>,
- * Tigran Aivazian <tigran@sco.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
- */
-#include <linux/pid_namespace.h>
-#include <linux/clocksource.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/console.h>
-#include <linux/threads.h>
-#include <linux/uaccess.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/ptrace.h>
-#include <linux/reboot.h>
-#include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/sysrq.h>
-#include <linux/init.h>
-#include <linux/kgdb.h>
-#include <linux/pid.h>
-#include <linux/smp.h>
-#include <linux/mm.h>
-
-#include <asm/cacheflush.h>
-#include <asm/byteorder.h>
-#include <asm/atomic.h>
-#include <asm/system.h>
-#include <asm/unaligned.h>
-
-static int kgdb_break_asap;
-
-#define KGDB_MAX_THREAD_QUERY 17
-struct kgdb_state {
-        int                     ex_vector;
-        int                     signo;
-        int                     err_code;
-        int                     cpu;
-        int                     pass_exception;
-        unsigned long           thr_query;
-        unsigned long           threadid;
-        long                    kgdb_usethreadid;
-        struct pt_regs          *linux_regs;
-};
-
-/* Exception state values */
-#define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
-#define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
-#define DCPU_IS_SLAVE    0x4 /* Slave cpu enter exception */
-#define DCPU_SSTEP       0x8 /* CPU is single stepping */
-
-static struct debuggerinfo_struct {
-        void                    *debuggerinfo;
-        struct task_struct      *task;
-        int                     exception_state;
-} kgdb_info[NR_CPUS];
-
-/**
- * kgdb_connected - Is a host GDB connected to us?
- */
-int                             kgdb_connected;
-EXPORT_SYMBOL_GPL(kgdb_connected);
-
-/* All the KGDB handlers are installed */
-static int                      kgdb_io_module_registered;
-
-/* Guard for recursive entry */
-static int                      exception_level;
-
-static struct kgdb_io           *kgdb_io_ops;
-static DEFINE_SPINLOCK(kgdb_registration_lock);
-
-/* kgdb console driver is loaded */
-static int kgdb_con_registered;
-/* determine if kgdb console output should be used */
-static int kgdb_use_con;
-
-static int __init opt_kgdb_con(char *str)
-{
-        kgdb_use_con = 1;
-        return 0;
-}
-
-early_param("kgdbcon", opt_kgdb_con);
-
-module_param(kgdb_use_con, int, 0644);
-
-/*
- * Holds information about breakpoints in a kernel. These breakpoints are
- * added and removed by gdb.
- */
-static struct kgdb_bkpt         kgdb_break[KGDB_MAX_BREAKPOINTS] = {
-        [0 ... KGDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
-};
-
-/*
- * The CPU# of the active CPU, or -1 if none:
- */
-atomic_t                        kgdb_active = ATOMIC_INIT(-1);
-
-/*
- * We use NR_CPUs not PERCPU, in case kgdb is used to debug early
- * bootup code (which might not have percpu set up yet):
- */
-static atomic_t                 passive_cpu_wait[NR_CPUS];
-static atomic_t                 cpu_in_kgdb[NR_CPUS];
-atomic_t                        kgdb_setting_breakpoint;
-
-struct task_struct              *kgdb_usethread;
-struct task_struct              *kgdb_contthread;
-
-int                             kgdb_single_step;
-pid_t                           kgdb_sstep_pid;
-
-/* Our I/O buffers. */
-static char                     remcom_in_buffer[BUFMAX];
-static char                     remcom_out_buffer[BUFMAX];
-
-/* Storage for the registers, in GDB format. */
-static unsigned long            gdb_regs[(NUMREGBYTES +
-                                        sizeof(unsigned long) - 1) /
-                                        sizeof(unsigned long)];
-
-/* to keep track of the CPU which is doing the single stepping*/
-atomic_t                        kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);
-
-/*
- * If you are debugging a problem where roundup (the collection of
- * all other CPUs) is a problem [this should be extremely rare],
- * then use the nokgdbroundup option to avoid roundup. In that case
- * the other CPUs might interfere with your debugging context, so
- * use this with care:
- */
-static int kgdb_do_roundup = 1;
-
-static int __init opt_nokgdbroundup(char *str)
-{
-        kgdb_do_roundup = 0;
-
-        return 0;
-}
-
-early_param("nokgdbroundup", opt_nokgdbroundup);
-
-/*
- * Finally, some KGDB code :-)
- */
-
-/*
- * Weak aliases for breakpoint management,
- * can be overriden by architectures when needed:
- */
-int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
-{
-        int err;
-
-        err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
-        if (err)
-                return err;
-
-        return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
-                                  BREAK_INSTR_SIZE);
-}
-
-int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
-{
-        return probe_kernel_write((char *)addr,
-                                  (char *)bundle, BREAK_INSTR_SIZE);
-}
-
-int __weak kgdb_validate_break_address(unsigned long addr)
-{
-        char tmp_variable[BREAK_INSTR_SIZE];
-        int err;
-        /* Validate setting the breakpoint and then removing it.  In the
-         * remove fails, the kernel needs to emit a bad message because we
-         * are deep trouble not being able to put things back the way we
-         * found them.
-         */
-        err = kgdb_arch_set_breakpoint(addr, tmp_variable);
-        if (err)
-                return err;
-        err = kgdb_arch_remove_breakpoint(addr, tmp_variable);
-        if (err)
-                printk(KERN_ERR "KGDB: Critical breakpoint error, kernel "
-                   "memory destroyed at: %lx", addr);
-        return err;
-}
-
-unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs)
-{
-        return instruction_pointer(regs);
-}
-
-int __weak kgdb_arch_init(void)
-{
-        return 0;
-}
-
-int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
-{
-        return 0;
-}
-
-void __weak
-kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
-{
-        return;
-}
-
-/**
- *      kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
- *      @regs: Current &struct pt_regs.
- *
- *      This function will be called if the particular architecture must
- *      disable hardware debugging while it is processing gdb packets or
- *      handling exception.
- */
-void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
-{
-}
-
-/*
- * GDB remote protocol parser:
- */
-
-static int hex(char ch)
-{
-        if ((ch >= 'a') && (ch <= 'f'))
-                return ch - 'a' + 10;
-        if ((ch >= '0') && (ch <= '9'))
-                return ch - '0';
-        if ((ch >= 'A') && (ch <= 'F'))
-                return ch - 'A' + 10;
-        return -1;
-}
-
-/* scan for the sequence $<data>#<checksum> */
-static void get_packet(char *buffer)
-{
-        unsigned char checksum;
-        unsigned char xmitcsum;
-        int count;
-        char ch;
-
-        do {
-                /*
-                 * Spin and wait around for the start character, ignore all
-                 * other characters:
-                 */
-                while ((ch = (kgdb_io_ops->read_char())) != '$')
-                        /* nothing */;
-
-                kgdb_connected = 1;
-                checksum = 0;
-                xmitcsum = -1;
-
-                count = 0;
-
-                /*
-                 * now, read until a # or end of buffer is found:
-                 */
-                while (count < (BUFMAX - 1)) {
-                        ch = kgdb_io_ops->read_char();
-                        if (ch == '#')
-                                break;
-                        checksum = checksum + ch;
-                        buffer[count] = ch;
-                        count = count + 1;
-                }
-                buffer[count] = 0;
-
-                if (ch == '#') {
-                        xmitcsum = hex(kgdb_io_ops->read_char()) << 4;
-                        xmitcsum += hex(kgdb_io_ops->read_char());
-
-                        if (checksum != xmitcsum)
-                                /* failed checksum */
-                                kgdb_io_ops->write_char('-');
-                        else
-                                /* successful transfer */
-                                kgdb_io_ops->write_char('+');
-                        if (kgdb_io_ops->flush)
-                                kgdb_io_ops->flush();
-                }
-        } while (checksum != xmitcsum);
-}
-
-/*
- * Send the packet in buffer.
- * Check for gdb connection if asked for.
- */
-static void put_packet(char *buffer)
-{
-        unsigned char checksum;
-        int count;
-        char ch;
-
-        /*
-         * $<packet info>#<checksum>.
-         */
-        while (1) {
-                kgdb_io_ops->write_char('$');
-                checksum = 0;
-                count = 0;
-
-                while ((ch = buffer[count])) {
-                        kgdb_io_ops->write_char(ch);
-                        checksum += ch;
-                        count++;
-                }
-
-                kgdb_io_ops->write_char('#');
-                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();
-
-                /* Now see what we get in reply. */
-                ch = kgdb_io_ops->read_char();
-
-                if (ch == 3)
-                        ch = kgdb_io_ops->read_char();
-
-                /* If we get an ACK, we are done. */
-                if (ch == '+')
-                        return;
-
-                /*
-                 * If we get the start of another packet, this means
-                 * that GDB is attempting to reconnect.  We will NAK
-                 * the packet being sent, and stop trying to send this
-                 * packet.
-                 */
-                if (ch == '$') {
-                        kgdb_io_ops->write_char('-');
-                        if (kgdb_io_ops->flush)
-                                kgdb_io_ops->flush();
-                        return;
-                }
-        }
-}
-
-/*
- * Convert the memory pointed to by mem into hex, placing result in buf.
- * Return a pointer to the last char put in buf (null). May return an error.
- */
-int kgdb_mem2hex(char *mem, char *buf, int count)
-{
-        char *tmp;
-        int err;
-
-        /*
-         * We use the upper half of buf as an intermediate buffer for the
-         * raw memory copy.  Hex conversion will work against this one.
-         */
-        tmp = buf + count;
-
-        err = probe_kernel_read(tmp, mem, count);
-        if (!err) {
-                while (count > 0) {
-                        buf = pack_hex_byte(buf, *tmp);
-                        tmp++;
-                        count--;
-                }
-
-                *buf = 0;
-        }
-
-        return err;
-}
-
-/*
- * Copy the binary array pointed to by buf into mem.  Fix $, #, and
- * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
- * The input buf is overwitten with the result to write to mem.
- */
-static int kgdb_ebin2mem(char *buf, char *mem, int count)
-{
-        int size = 0;
-        char *c = buf;
-
-        while (count-- > 0) {
-                c[size] = *buf++;
-                if (c[size] == 0x7d)
-                        c[size] = *buf++ ^ 0x20;
-                size++;
-        }
-
-        return probe_kernel_write(mem, c, size);
-}
-
-/*
- * Convert the hex array pointed to by buf into binary to be placed in mem.
- * Return a pointer to the character AFTER the last byte written.
- * May return an error.
- */
-int kgdb_hex2mem(char *buf, char *mem, int count)
-{
-        char *tmp_raw;
-        char *tmp_hex;
-
-        /*
-         * We use the upper half of buf as an intermediate buffer for the
-         * raw memory that is converted from hex.
-         */
-        tmp_raw = buf + count * 2;
-
-        tmp_hex = tmp_raw - 1;
-        while (tmp_hex >= buf) {
-                tmp_raw--;
-                *tmp_raw = hex(*tmp_hex--);
-                *tmp_raw |= hex(*tmp_hex--) << 4;
-        }
-
-        return probe_kernel_write(mem, tmp_raw, count);
-}
-
-/*
- * While we find nice hex chars, build a long_val.
- * Return number of chars processed.
- */
-int kgdb_hex2long(char **ptr, unsigned long *long_val)
-{
-        int hex_val;
-        int num = 0;
-        int negate = 0;
-
-        *long_val = 0;
-
-        if (**ptr == '-') {
-                negate = 1;
-                (*ptr)++;
-        }
-        while (**ptr) {
-                hex_val = hex(**ptr);
-                if (hex_val < 0)
-                        break;
-
-                *long_val = (*long_val << 4) | hex_val;
-                num++;
-                (*ptr)++;
-        }
-
-        if (negate)
-                *long_val = -*long_val;
-
-        return num;
-}
-
-/* Write memory due to an 'M' or 'X' packet. */
-static int write_mem_msg(int binary)
-{
-        char *ptr = &remcom_in_buffer[1];
-        unsigned long addr;
-        unsigned long length;
-        int err;
-
-        if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
-            kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
-                if (binary)
-                        err = kgdb_ebin2mem(ptr, (char *)addr, length);
-                else
-                        err = kgdb_hex2mem(ptr, (char *)addr, length);
-                if (err)
-                        return err;
-                if (CACHE_FLUSH_IS_SAFE)
-                        flush_icache_range(addr, addr + length);
-                return 0;
-        }
-
-        return -EINVAL;
-}
-
-static void error_packet(char *pkt, int error)
-{
-        error = -error;
-        pkt[0] = 'E';
-        pkt[1] = hex_asc[(error / 10)];
-        pkt[2] = hex_asc[(error % 10)];
-        pkt[3] = '\0';
-}
-
-/*
- * Thread ID accessors. We represent a flat TID space to GDB, where
- * the per CPU idle threads (which under Linux all have PID 0) are
- * remapped to negative TIDs.
- */
-
-#define BUF_THREAD_ID_SIZE      16
-
-static char *pack_threadid(char *pkt, unsigned char *id)
-{
-        char *limit;
-
-        limit = pkt + BUF_THREAD_ID_SIZE;
-        while (pkt < limit)
-                pkt = pack_hex_byte(pkt, *id++);
-
-        return pkt;
-}
-
-static void int_to_threadref(unsigned char *id, int value)
-{
-        unsigned char *scan;
-        int i = 4;
-
-        scan = (unsigned char *)id;
-        while (i--)
-                *scan++ = 0;
-        put_unaligned_be32(value, scan);
-}
-
-static struct task_struct *getthread(struct pt_regs *regs, int tid)
-{
-        /*
-         * Non-positive TIDs are remapped to the cpu shadow information
-         */
-        if (tid == 0 || tid == -1)
-                tid = -atomic_read(&kgdb_active) - 2;
-        if (tid < -1 && tid > -NR_CPUS - 2) {
-                if (kgdb_info[-tid - 2].task)
-                        return kgdb_info[-tid - 2].task;
-                else
-                        return idle_task(-tid - 2);
-        }
-        if (tid <= 0) {
-                printk(KERN_ERR "KGDB: Internal thread select error\n");
-                dump_stack();
-                return NULL;
-        }
-
-        /*
-         * find_task_by_pid_ns() does not take the tasklist lock anymore
-         * but is nicely RCU locked - hence is a pretty resilient
-         * thing to use:
-         */
-        return find_task_by_pid_ns(tid, &init_pid_ns);
-}
-
-/*
- * Some architectures need cache flushes when we set/clear a
- * breakpoint:
- */
-static void kgdb_flush_swbreak_addr(unsigned long addr)
-{
-        if (!CACHE_FLUSH_IS_SAFE)
-                return;
-
-        if (current->mm && current->mm->mmap_cache) {
-                flush_cache_range(current->mm->mmap_cache,
-                                  addr, addr + BREAK_INSTR_SIZE);
-        }
-        /* Force flush instruction cache if it was outside the mm */
-        flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
-}
-
-/*
- * SW breakpoint management:
- */
-static int kgdb_activate_sw_breakpoints(void)
-{
-        unsigned long addr;
-        int error;
-        int ret = 0;
-        int i;
-
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if (kgdb_break[i].state != BP_SET)
-                        continue;
-
-                addr = kgdb_break[i].bpt_addr;
-                error = kgdb_arch_set_breakpoint(addr,
-                                kgdb_break[i].saved_instr);
-                if (error) {
-                        ret = error;
-                        printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
-                        continue;
-                }
-
-                kgdb_flush_swbreak_addr(addr);
-                kgdb_break[i].state = BP_ACTIVE;
-        }
-        return ret;
-}
-
-static int kgdb_set_sw_break(unsigned long addr)
-{
-        int err = kgdb_validate_break_address(addr);
-        int breakno = -1;
-        int i;
-
-        if (err)
-                return err;
-
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if ((kgdb_break[i].state == BP_SET) &&
-                                        (kgdb_break[i].bpt_addr == addr))
-                        return -EEXIST;
-        }
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if (kgdb_break[i].state == BP_REMOVED &&
-                                        kgdb_break[i].bpt_addr == addr) {
-                        breakno = i;
-                        break;
-                }
-        }
-
-        if (breakno == -1) {
-                for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                        if (kgdb_break[i].state == BP_UNDEFINED) {
-                                breakno = i;
-                                break;
-                        }
-                }
-        }
-
-        if (breakno == -1)
-                return -E2BIG;
-
-        kgdb_break[breakno].state = BP_SET;
-        kgdb_break[breakno].type = BP_BREAKPOINT;
-        kgdb_break[breakno].bpt_addr = addr;
-
-        return 0;
-}
-
-static int kgdb_deactivate_sw_breakpoints(void)
-{
-        unsigned long addr;
-        int error;
-        int ret = 0;
-        int i;
-
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if (kgdb_break[i].state != BP_ACTIVE)
-                        continue;
-                addr = kgdb_break[i].bpt_addr;
-                error = kgdb_arch_remove_breakpoint(addr,
-                                        kgdb_break[i].saved_instr);
-                if (error) {
-                        printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
-                        ret = error;
-                }
-
-                kgdb_flush_swbreak_addr(addr);
-                kgdb_break[i].state = BP_SET;
-        }
-        return ret;
-}
-
-static int kgdb_remove_sw_break(unsigned long addr)
-{
-        int i;
-
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if ((kgdb_break[i].state == BP_SET) &&
-                                (kgdb_break[i].bpt_addr == addr)) {
-                        kgdb_break[i].state = BP_REMOVED;
-                        return 0;
-                }
-        }
-        return -ENOENT;
-}
-
-int kgdb_isremovedbreak(unsigned long addr)
-{
-        int i;
-
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if ((kgdb_break[i].state == BP_REMOVED) &&
-                                        (kgdb_break[i].bpt_addr == addr))
-                        return 1;
-        }
-        return 0;
-}
-
-static int remove_all_break(void)
-{
-        unsigned long addr;
-        int error;
-        int i;
-
-        /* Clear memory breakpoints. */
-        for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
-                if (kgdb_break[i].state != BP_ACTIVE)
-                        goto setundefined;
-                addr = kgdb_break[i].bpt_addr;
-                error = kgdb_arch_remove_breakpoint(addr,
-                                kgdb_break[i].saved_instr);
-                if (error)
-                        printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
-                           addr);
-setundefined:
-                kgdb_break[i].state = BP_UNDEFINED;
-        }
-
-        /* Clear hardware breakpoints. */
-        if (arch_kgdb_ops.remove_all_hw_break)
-                arch_kgdb_ops.remove_all_hw_break();
-
-        return 0;
-}
-
-/*
- * Remap normal tasks to their real PID,
- * CPU shadow threads are mapped to -CPU - 2
- */
-static inline int shadow_pid(int realpid)
-{
-        if (realpid)
-                return realpid;
-
-        return -raw_smp_processor_id() - 2;
-}
-
-static char gdbmsgbuf[BUFMAX + 1];
-
-static void kgdb_msg_write(const char *s, int len)
-{
-        char *bufptr;
-        int wcount;
-        int i;
-
-        /* 'O'utput */
-        gdbmsgbuf[0] = 'O';
-
-        /* Fill and send buffers... */
-        while (len > 0) {
-                bufptr = gdbmsgbuf + 1;
-
-                /* Calculate how many this time */
-                if ((len << 1) > (BUFMAX - 2))
-                        wcount = (BUFMAX - 2) >> 1;
-                else
-                        wcount = len;
-
-                /* Pack in hex chars */
-                for (i = 0; i < wcount; i++)
-                        bufptr = pack_hex_byte(bufptr, s[i]);
-                *bufptr = '\0';
-
-                /* Move up */
-                s += wcount;
-                len -= wcount;
-
-                /* Write packet */
-                put_packet(gdbmsgbuf);
-        }
-}
-
-/*
- * Return true if there is a valid kgdb I/O module.  Also if no
- * debugger is attached a message can be printed to the console about
- * waiting for the debugger to attach.
- *
- * The print_wait argument is only to be true when called from inside
- * the core kgdb_handle_exception, because it will wait for the
- * debugger to attach.
- */
-static int kgdb_io_ready(int print_wait)
-{
-        if (!kgdb_io_ops)
-                return 0;
-        if (kgdb_connected)
-                return 1;
-        if (atomic_read(&kgdb_setting_breakpoint))
-                return 1;
-        if (print_wait)
-                printk(KERN_CRIT "KGDB: Waiting for remote debugger\n");
-        return 1;
-}
-
-/*
- * All the functions that start with gdb_cmd are the various
- * operations to implement the handlers for the gdbserial protocol
- * where KGDB is communicating with an external debugger
- */
-
-/* Handle the '?' status packets */
-static void gdb_cmd_status(struct kgdb_state *ks)
-{
-        /*
-         * We know that this packet is only sent
-         * during initial connect.  So to be safe,
-         * we clear out our breakpoints now in case
-         * GDB is reconnecting.
-         */
-        remove_all_break();
-
-        remcom_out_buffer[0] = 'S';
-        pack_hex_byte(&remcom_out_buffer[1], ks->signo);
-}
-
-/* Handle the 'g' get registers request */
-static void gdb_cmd_getregs(struct kgdb_state *ks)
-{
-        struct task_struct *thread;
-        void *local_debuggerinfo;
-        int i;
-
-        thread = kgdb_usethread;
-        if (!thread) {
-                thread = kgdb_info[ks->cpu].task;
-                local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
-        } else {
-                local_debuggerinfo = NULL;
-                for_each_online_cpu(i) {
-                        /*
-                         * Try to find the task on some other
-                         * or possibly this node if we do not
-                         * find the matching task then we try
-                         * to approximate the results.
-                         */
-                        if (thread == kgdb_info[i].task)
-                                local_debuggerinfo = kgdb_info[i].debuggerinfo;
-                }
-        }
-
-        /*
-         * All threads that don't have debuggerinfo should be
-         * in schedule() sleeping, since all other CPUs
-         * are in kgdb_wait, and thus have debuggerinfo.
-         */
-        if (local_debuggerinfo) {
-                pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
-        } else {
-                /*
-                 * Pull stuff saved during switch_to; nothing
-                 * else is accessible (or even particularly
-                 * relevant).
-                 *
-                 * This should be enough for a stack trace.
-                 */
-                sleeping_thread_to_gdb_regs(gdb_regs, thread);
-        }
-        kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
-}
-
-/* Handle the 'G' set registers request */
-static void gdb_cmd_setregs(struct kgdb_state *ks)
-{
-        kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
-
-        if (kgdb_usethread && kgdb_usethread != current) {
-                error_packet(remcom_out_buffer, -EINVAL);
-        } else {
-                gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
-                strcpy(remcom_out_buffer, "OK");
-        }
-}
-
-/* Handle the 'm' memory read bytes */
-static void gdb_cmd_memread(struct kgdb_state *ks)
-{
-        char *ptr = &remcom_in_buffer[1];
-        unsigned long length;
-        unsigned long addr;
-        int err;
-
-        if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
-                                        kgdb_hex2long(&ptr, &length) > 0) {
-                err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
-                if (err)
-                        error_packet(remcom_out_buffer, err);
-        } else {
-                error_packet(remcom_out_buffer, -EINVAL);
-        }
-}
-
-/* Handle the 'M' memory write bytes */
-static void gdb_cmd_memwrite(struct kgdb_state *ks)
-{
-        int err = write_mem_msg(0);
-
-        if (err)
-                error_packet(remcom_out_buffer, err);
-        else
-                strcpy(remcom_out_buffer, "OK");
-}
-
-/* Handle the 'X' memory binary write bytes */
-static void gdb_cmd_binwrite(struct kgdb_state *ks)
-{
-        int err = write_mem_msg(1);
-
-        if (err)
-                error_packet(remcom_out_buffer, err);
-        else
-                strcpy(remcom_out_buffer, "OK");
-}
-
-/* Handle the 'D' or 'k', detach or kill packets */
-static void gdb_cmd_detachkill(struct kgdb_state *ks)
-{
-        int error;
-
-        /* The detach case */
-        if (remcom_in_buffer[0] == 'D') {
-                error = remove_all_break();
-                if (error < 0) {
-                        error_packet(remcom_out_buffer, error);
-                } else {
-                        strcpy(remcom_out_buffer, "OK");
-                        kgdb_connected = 0;
-                }
-                put_packet(remcom_out_buffer);
-        } else {
-                /*
-                 * Assume the kill case, with no exit code checking,
-                 * trying to force detach the debugger:
-                 */
-                remove_all_break();
-                kgdb_connected = 0;
-        }
-}
-
-/* Handle the 'R' reboot packets */
-static int gdb_cmd_reboot(struct kgdb_state *ks)
-{
-        /* For now, only honor R0 */
-        if (strcmp(remcom_in_buffer, "R0") == 0) {
-                printk(KERN_CRIT "Executing emergency reboot\n");
-                strcpy(remcom_out_buffer, "OK");
-                put_packet(remcom_out_buffer);
-
-                /*
-                 * Execution should not return from
-                 * machine_emergency_restart()
-                 */
-                machine_emergency_restart();
-                kgdb_connected = 0;
-
-                return 1;
-        }
-        return 0;
-}
-
-/* Handle the 'q' query packets */
-static void gdb_cmd_query(struct kgdb_state *ks)
-{
-        struct task_struct *g;
-        struct task_struct *p;
-        unsigned char thref[8];
-        char *ptr;
-        int i;
-        int cpu;
-        int finished = 0;
-
-        switch (remcom_in_buffer[1]) {
-        case 's':
-        case 'f':
-                if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
-                        error_packet(remcom_out_buffer, -EINVAL);
-                        break;
-                }
-
-                i = 0;
-                remcom_out_buffer[0] = 'm';
-                ptr = remcom_out_buffer + 1;
-                if (remcom_in_buffer[1] == 'f') {
-                        /* Each cpu is a shadow thread */
-                        for_each_online_cpu(cpu) {
-                                ks->thr_query = 0;
-                                int_to_threadref(thref, -cpu - 2);
-                                pack_threadid(ptr, thref);
-                                ptr += BUF_THREAD_ID_SIZE;
-                                *(ptr++) = ',';
-                                i++;
-                        }
-                }
-
-                do_each_thread(g, p) {
-                        if (i >= ks->thr_query && !finished) {
-                                int_to_threadref(thref, p->pid);
-                                pack_threadid(ptr, thref);
-                                ptr += BUF_THREAD_ID_SIZE;
-                                *(ptr++) = ',';
-                                ks->thr_query++;
-                                if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
-                                        finished = 1;
-                        }
-                        i++;
-                } while_each_thread(g, p);
-
-                *(--ptr) = '\0';
-                break;
-
-        case 'C':
-                /* Current thread id */
-                strcpy(remcom_out_buffer, "QC");
-                ks->threadid = shadow_pid(current->pid);
-                int_to_threadref(thref, ks->threadid);
-                pack_threadid(remcom_out_buffer + 2, thref);
-                break;
-        case 'T':
-                if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
-                        error_packet(remcom_out_buffer, -EINVAL);
-                        break;
-                }
-                ks->threadid = 0;
-                ptr = remcom_in_buffer + 17;
-                kgdb_hex2long(&ptr, &ks->threadid);
-                if (!getthread(ks->linux_regs, ks->threadid)) {
-                        error_packet(remcom_out_buffer, -EINVAL);
-                        break;
-                }
-                if ((int)ks->threadid > 0) {
-                        kgdb_mem2hex(getthread(ks->linux_regs,
-                                        ks->threadid)->comm,
-                                        remcom_out_buffer, 16);
-                } else {
-                        static char tmpstr[23 + BUF_THREAD_ID_SIZE];
-
-                        sprintf(tmpstr, "shadowCPU%d",
-                                        (int)(-ks->threadid - 2));
-                        kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
-                }
-                break;
-        }
-}
-
-/* Handle the 'H' task query packets */
-static void gdb_cmd_task(struct kgdb_state *ks)
-{
-        struct task_struct *thread;
-        char *ptr;
-
-        switch (remcom_in_buffer[1]) {
-        case 'g':
-                ptr = &remcom_in_buffer[2];
-                kgdb_hex2long(&ptr, &ks->threadid);
-                thread = getthread(ks->linux_regs, ks->threadid);
-                if (!thread && ks->threadid > 0) {
-                        error_packet(remcom_out_buffer, -EINVAL);
-                        break;
-                }
-                kgdb_usethread = thread;
-                ks->kgdb_usethreadid = ks->threadid;
-                strcpy(remcom_out_buffer, "OK");
-                break;
-        case 'c':
-                ptr = &remcom_in_buffer[2];
-                kgdb_hex2long(&ptr, &ks->threadid);
-                if (!ks->threadid) {
-                        kgdb_contthread = NULL;
-                } else {
-                        thread = getthread(ks->linux_regs, ks->threadid);
-                        if (!thread && ks->threadid > 0) {
-                                error_packet(remcom_out_buffer, -EINVAL);
-                                break;
-                        }
-                        kgdb_contthread = thread;
-                }
-                strcpy(remcom_out_buffer, "OK");
-                break;
-        }
-}
-
-/* Handle the 'T' thread query packets */
-static void gdb_cmd_thread(struct kgdb_state *ks)
-{
-        char *ptr = &remcom_in_buffer[1];
-        struct task_struct *thread;
-
-        kgdb_hex2long(&ptr, &ks->threadid);
-        thread = getthread(ks->linux_regs, ks->threadid);
-        if (thread)
-                strcpy(remcom_out_buffer, "OK");
-        else
-                error_packet(remcom_out_buffer, -EINVAL);
-}
-
-/* Handle the 'z' or 'Z' breakpoint remove or set packets */
-static void gdb_cmd_break(struct kgdb_state *ks)
-{
-        /*
-         * Since GDB-5.3, it's been drafted that '0' is a software
-         * breakpoint, '1' is a hardware breakpoint, so let's do that.
-         */
-        char *bpt_type = &remcom_in_buffer[1];
-        char *ptr = &remcom_in_buffer[2];
-        unsigned long addr;
-        unsigned long length;
-        int error = 0;
-
-        if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
-                /* Unsupported */
-                if (*bpt_type > '4')
-                        return;
-        } else {
-                if (*bpt_type != '0' && *bpt_type != '1')
-                        /* Unsupported. */
-                        return;
-        }
-
-        /*
-         * Test if this is a hardware breakpoint, and
-         * if we support it:
-         */
-        if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
-                /* Unsupported. */
-                return;
-
-        if (*(ptr++) != ',') {
-                error_packet(remcom_out_buffer, -EINVAL);
-                return;
-        }
-        if (!kgdb_hex2long(&ptr, &addr)) {
-                error_packet(remcom_out_buffer, -EINVAL);
-                return;
-        }
-        if (*(ptr++) != ',' ||
-                !kgdb_hex2long(&ptr, &length)) {
-                error_packet(remcom_out_buffer, -EINVAL);
-                return;
-        }
-
-        if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
-                error = kgdb_set_sw_break(addr);
-        else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
-                error = kgdb_remove_sw_break(addr);
-        else if (remcom_in_buffer[0] == 'Z')
-                error = arch_kgdb_ops.set_hw_breakpoint(addr,
-                        (int)length, *bpt_type - '0');
-        else if (remcom_in_buffer[0] == 'z')
-                error = arch_kgdb_ops.remove_hw_breakpoint(addr,
-                        (int) length, *bpt_type - '0');
-
-        if (error == 0)
-                strcpy(remcom_out_buffer, "OK");
-        else
-                error_packet(remcom_out_buffer, error);
-}
-
-/* Handle the 'C' signal / exception passing packets */
-static int gdb_cmd_exception_pass(struct kgdb_state *ks)
-{
-        /* C09 == pass exception
-         * C15 == detach kgdb, pass exception
-         */
-        if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
-
-                ks->pass_exception = 1;
-                remcom_in_buffer[0] = 'c';
-
-        } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
-
-                ks->pass_exception = 1;
-                remcom_in_buffer[0] = 'D';
-                remove_all_break();
-                kgdb_connected = 0;
-                return 1;
-
-        } else {
-                kgdb_msg_write("KGDB only knows signal 9 (pass)"
-                        " and 15 (pass and disconnect)\n"
-                        "Executing a continue without signal passing\n", 0);
-                remcom_in_buffer[0] = 'c';
-        }
-
-        /* Indicate fall through */
-        return -1;
-}
-
-/*
- * This function performs all gdbserial command procesing
- */
-static int gdb_serial_stub(struct kgdb_state *ks)
-{
-        int error = 0;
-        int tmp;
-
-        /* Clear the out buffer. */
-        memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
-
-        if (kgdb_connected) {
-                unsigned char thref[8];
-                char *ptr;
-
-                /* Reply to host that an exception has occurred */
-                ptr = remcom_out_buffer;
-                *ptr++ = 'T';
-                ptr = pack_hex_byte(ptr, ks->signo);
-                ptr += strlen(strcpy(ptr, "thread:"));
-                int_to_threadref(thref, shadow_pid(current->pid));
-                ptr = pack_threadid(ptr, thref);
-                *ptr++ = ';';
-                put_packet(remcom_out_buffer);
-        }
-
-        kgdb_usethread = kgdb_info[ks->cpu].task;
-        ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
-        ks->pass_exception = 0;
-
-        while (1) {
-                error = 0;
-
-                /* Clear the out buffer. */
-                memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
-
-                get_packet(remcom_in_buffer);
-
-                switch (remcom_in_buffer[0]) {
-                case '?': /* gdbserial status */
-                        gdb_cmd_status(ks);
-                        break;
-                case 'g': /* return the value of the CPU registers */
-                        gdb_cmd_getregs(ks);
-                        break;
-                case 'G': /* set the value of the CPU registers - return OK */
-                        gdb_cmd_setregs(ks);
-                        break;
-                case 'm': /* mAA..AA,LLLL  Read LLLL bytes at address AA..AA */
-                        gdb_cmd_memread(ks);
-                        break;
-                case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
-                        gdb_cmd_memwrite(ks);
-                        break;
-                case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
-                        gdb_cmd_binwrite(ks);
-                        break;
-                        /* kill or detach. KGDB should treat this like a
-                         * continue.
-                         */
-                case 'D': /* Debugger detach */
-                case 'k': /* Debugger detach via kill */
-                        gdb_cmd_detachkill(ks);
-                        goto default_handle;
-                case 'R': /* Reboot */
-                        if (gdb_cmd_reboot(ks))
-                                goto default_handle;
-                        break;
-                case 'q': /* query command */
-                        gdb_cmd_query(ks);
-                        break;
-                case 'H': /* task related */
-                        gdb_cmd_task(ks);
-                        break;
-                case 'T': /* Query thread status */
-                        gdb_cmd_thread(ks);
-                        break;
-                case 'z': /* Break point remove */
-                case 'Z': /* Break point set */
-                        gdb_cmd_break(ks);
-                        break;
-                case 'C': /* Exception passing */
-                        tmp = gdb_cmd_exception_pass(ks);
-                        if (tmp > 0)
-                                goto default_handle;
-                        if (tmp == 0)
-                                break;
-                        /* Fall through on tmp < 0 */
-                case 'c': /* Continue packet */
-                case 's': /* Single step packet */
-                        if (kgdb_contthread && kgdb_contthread != current) {
-                                /* Can't switch threads in kgdb */
-                                error_packet(remcom_out_buffer, -EINVAL);
-                                break;
-                        }
-                        kgdb_activate_sw_breakpoints();
-                        /* Fall through to default processing */
-                default:
-default_handle:
-                        error = kgdb_arch_handle_exception(ks->ex_vector,
-                                                ks->signo,
-                                                ks->err_code,
-                                                remcom_in_buffer,
-                                                remcom_out_buffer,
-                                                ks->linux_regs);
-                        /*
-                         * Leave cmd processing on error, detach,
-                         * kill, continue, or single step.
-                         */
-                        if (error >= 0 || remcom_in_buffer[0] == 'D' ||
-                            remcom_in_buffer[0] == 'k') {
-                                error = 0;
-                                goto kgdb_exit;
-                        }
-
-                }
-
-                /* reply to the request */
-                put_packet(remcom_out_buffer);
-        }
-
-kgdb_exit:
-        if (ks->pass_exception)
-                error = 1;
-        return error;
-}
-
-static int kgdb_reenter_check(struct kgdb_state *ks)
-{
-        unsigned long addr;
-
-        if (atomic_read(&kgdb_active) != raw_smp_processor_id())
-                return 0;
-
-        /* Panic on recursive debugger calls: */
-        exception_level++;
-        addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
-        kgdb_deactivate_sw_breakpoints();
-
-        /*
-         * If the break point removed ok at the place exception
-         * occurred, try to recover and print a warning to the end
-         * user because the user planted a breakpoint in a place that
-         * KGDB needs in order to function.
-         */
-        if (kgdb_remove_sw_break(addr) == 0) {
-                exception_level = 0;
-                kgdb_skipexception(ks->ex_vector, ks->linux_regs);
-                kgdb_activate_sw_breakpoints();
-                printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n",
-                        addr);
-                WARN_ON_ONCE(1);
-
-                return 1;
-        }
-        remove_all_break();
-        kgdb_skipexception(ks->ex_vector, ks->linux_regs);
-
-        if (exception_level > 1) {
-                dump_stack();
-                panic("Recursive entry to debugger");
-        }
-
-        printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
-        dump_stack();
-        panic("Recursive entry to debugger");
-
-        return 1;
-}
-
-static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
-{
-        unsigned long flags;
-        int sstep_tries = 100;
-        int error = 0;
-        int i, cpu;
-        int trace_on = 0;
-acquirelock:
-        /*
-         * Interrupts will be restored by the 'trap return' code, except when
-         * single stepping.
-         */
-        local_irq_save(flags);
-
-        cpu = ks->cpu;
-        kgdb_info[cpu].debuggerinfo = regs;
-        kgdb_info[cpu].task = current;
-        /*
-         * Make sure the above info reaches the primary CPU before
-         * our cpu_in_kgdb[] flag setting does:
-         */
-        atomic_inc(&cpu_in_kgdb[cpu]);
-
-        /*
-         * CPU will loop if it is a slave or request to become a kgdb
-         * master cpu and acquire the kgdb_active lock:
-         */
-        while (1) {
-                if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
-                        if (atomic_cmpxchg(&kgdb_active, -1, cpu) == cpu)
-                                break;
-                } else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
-                        if (!atomic_read(&passive_cpu_wait[cpu]))
-                                goto return_normal;
-                } else {
-return_normal:
-                        /* Return to normal operation by executing any
-                         * hw breakpoint fixup.
-                         */
-                        if (arch_kgdb_ops.correct_hw_break)
-                                arch_kgdb_ops.correct_hw_break();
-                        if (trace_on)
-                                tracing_on();
-                        atomic_dec(&cpu_in_kgdb[cpu]);
-                        touch_softlockup_watchdog_sync();
-                        clocksource_touch_watchdog();
-                        local_irq_restore(flags);
-                        return 0;
-                }
-                cpu_relax();
-        }
-
-        /*
-         * For single stepping, try to only enter on the processor
-         * that was single stepping.  To gaurd against a deadlock, the
-         * kernel will only try for the value of sstep_tries before
-         * giving up and continuing on.
-         */
-        if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
-            (kgdb_info[cpu].task &&
-             kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
-                atomic_set(&kgdb_active, -1);
-                touch_softlockup_watchdog_sync();
-                clocksource_touch_watchdog();
-                local_irq_restore(flags);
-
-                goto acquirelock;
-        }
-
-        if (!kgdb_io_ready(1)) {
-                error = 1;
-                goto kgdb_restore; /* No I/O connection, so resume the system */
-        }
-
-        /*
-         * Don't enter if we have hit a removed breakpoint.
-         */
-        if (kgdb_skipexception(ks->ex_vector, ks->linux_regs))
-                goto kgdb_restore;
-
-        /* Call the I/O driver's pre_exception routine */
-        if (kgdb_io_ops->pre_exception)
-                kgdb_io_ops->pre_exception();
-
-        kgdb_disable_hw_debug(ks->linux_regs);
-
-        /*
-         * Get the passive CPU lock which will hold all the non-primary
-         * CPU in a spin state while the debugger is active
-         */
-        if (!kgdb_single_step) {
-                for (i = 0; i < NR_CPUS; i++)
-                        atomic_inc(&passive_cpu_wait[i]);
-        }
-
-#ifdef CONFIG_SMP
-        /* Signal the other CPUs to enter kgdb_wait() */
-        if ((!kgdb_single_step) && kgdb_do_roundup)
-                kgdb_roundup_cpus(flags);
-#endif
-
-        /*
-         * Wait for the other CPUs to be notified and be waiting for us:
-         */
-        for_each_online_cpu(i) {
-                while (!atomic_read(&cpu_in_kgdb[i]))
-                        cpu_relax();
-        }
-
-        /*
-         * At this point the primary processor is completely
-         * in the debugger and all secondary CPUs are quiescent
-         */
-        kgdb_post_primary_code(ks->linux_regs, ks->ex_vector, ks->err_code);
-        kgdb_deactivate_sw_breakpoints();
-        kgdb_single_step = 0;
-        kgdb_contthread = current;
-        exception_level = 0;
-        trace_on = tracing_is_on();
-        if (trace_on)
-                tracing_off();
-
-        /* Talk to debugger with gdbserial protocol */
-        error = gdb_serial_stub(ks);
-
-        /* Call the I/O driver's post_exception routine */
-        if (kgdb_io_ops->post_exception)
-                kgdb_io_ops->post_exception();
-
-        atomic_dec(&cpu_in_kgdb[ks->cpu]);
-
-        if (!kgdb_single_step) {
-                for (i = NR_CPUS-1; i >= 0; i--)
-                        atomic_dec(&passive_cpu_wait[i]);
-                /*
-                 * Wait till all the CPUs have quit
-                 * from the debugger.
-                 */
-                for_each_online_cpu(i) {
-                        while (atomic_read(&cpu_in_kgdb[i]))
-                                cpu_relax();
-                }
-        }
-
-kgdb_restore:
-        if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
-                int sstep_cpu = atomic_read(&kgdb_cpu_doing_single_step);
-                if (kgdb_info[sstep_cpu].task)
-                        kgdb_sstep_pid = kgdb_info[sstep_cpu].task->pid;
-                else
-                        kgdb_sstep_pid = 0;
-        }
-        if (trace_on)
-                tracing_on();
-        /* Free kgdb_active */
-        atomic_set(&kgdb_active, -1);
-        touch_softlockup_watchdog_sync();
-        clocksource_touch_watchdog();
-        local_irq_restore(flags);
-
-        return error;
-}
-
-/*
- * kgdb_handle_exception() - main entry point from a kernel exception
- *
- * Locking hierarchy:
- *      interface locks, if any (begin_session)
- *      kgdb lock (kgdb_active)
- */
-int
-kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
-{
-        struct kgdb_state kgdb_var;
-        struct kgdb_state *ks = &kgdb_var;
-        int ret;
-
-        ks->cpu                 = raw_smp_processor_id();
-        ks->ex_vector           = evector;
-        ks->signo               = signo;
-        ks->ex_vector           = evector;
-        ks->err_code            = ecode;
-        ks->kgdb_usethreadid    = 0;
-        ks->linux_regs          = regs;
-
-        if (kgdb_reenter_check(ks))
-                return 0; /* Ouch, double exception ! */
-        kgdb_info[ks->cpu].exception_state |= DCPU_WANT_MASTER;
-        ret = kgdb_cpu_enter(ks, regs);
-        kgdb_info[ks->cpu].exception_state &= ~DCPU_WANT_MASTER;
-        return ret;
-}
-
-int kgdb_nmicallback(int cpu, void *regs)
-{
-#ifdef CONFIG_SMP
-        struct kgdb_state kgdb_var;
-        struct kgdb_state *ks = &kgdb_var;
-
-        memset(ks, 0, sizeof(struct kgdb_state));
-        ks->cpu                 = cpu;
-        ks->linux_regs          = regs;
-
-        if (!atomic_read(&cpu_in_kgdb[cpu]) &&
-            atomic_read(&kgdb_active) != -1 &&
-            atomic_read(&kgdb_active) != cpu) {
-                kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
-                kgdb_cpu_enter(ks, regs);
-                kgdb_info[cpu].exception_state &= ~DCPU_IS_SLAVE;
-                return 0;
-        }
-#endif
-        return 1;
-}
-
-static void kgdb_console_write(struct console *co, const char *s,
-   unsigned count)
-{
-        unsigned long flags;
-
-        /* If we're debugging, or KGDB has not connected, don't try
-         * and print. */
-        if (!kgdb_connected || atomic_read(&kgdb_active) != -1)
-                return;
-
-        local_irq_save(flags);
-        kgdb_msg_write(s, count);
-        local_irq_restore(flags);
-}
-
-static struct console kgdbcons = {
-        .name           = "kgdb",
-        .write          = kgdb_console_write,
-        .flags          = CON_PRINTBUFFER | CON_ENABLED,
-        .index          = -1,
-};
-
-#ifdef CONFIG_MAGIC_SYSRQ
-static void sysrq_handle_gdb(int key, struct tty_struct *tty)
-{
-        if (!kgdb_io_ops) {
-                printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
-                return;
-        }
-        if (!kgdb_connected)
-                printk(KERN_CRIT "Entering KGDB\n");
-
-        kgdb_breakpoint();
-}
-
-static struct sysrq_key_op sysrq_gdb_op = {
-        .handler        = sysrq_handle_gdb,
-        .help_msg       = "debug(G)",
-        .action_msg     = "DEBUG",
-};
-#endif
-
-static void kgdb_register_callbacks(void)
-{
-        if (!kgdb_io_module_registered) {
-                kgdb_io_module_registered = 1;
-                kgdb_arch_init();
-#ifdef CONFIG_MAGIC_SYSRQ
-                register_sysrq_key('g', &sysrq_gdb_op);
-#endif
-                if (kgdb_use_con && !kgdb_con_registered) {
-                        register_console(&kgdbcons);
-                        kgdb_con_registered = 1;
-                }
-        }
-}
-
-static void kgdb_unregister_callbacks(void)
-{
-        /*
-         * When this routine is called KGDB should unregister from the
-         * panic handler and clean up, making sure it is not handling any
-         * break exceptions at the time.
-         */
-        if (kgdb_io_module_registered) {
-                kgdb_io_module_registered = 0;
-                kgdb_arch_exit();
-#ifdef CONFIG_MAGIC_SYSRQ
-                unregister_sysrq_key('g', &sysrq_gdb_op);
-#endif
-                if (kgdb_con_registered) {
-                        unregister_console(&kgdbcons);
-                        kgdb_con_registered = 0;
-                }
-        }
-}
-
-static void kgdb_initial_breakpoint(void)
-{
-        kgdb_break_asap = 0;
-
-        printk(KERN_CRIT "kgdb: Waiting for connection from remote gdb...\n");
-        kgdb_breakpoint();
-}
-
-/**
- *      kgdb_register_io_module - register KGDB IO module
- *      @new_kgdb_io_ops: the io ops vector
- *
- *      Register it with the KGDB core.
- */
-int kgdb_register_io_module(struct kgdb_io *new_kgdb_io_ops)
-{
-        int err;
-
-        spin_lock(&kgdb_registration_lock);
-
-        if (kgdb_io_ops) {
-                spin_unlock(&kgdb_registration_lock);
-
-                printk(KERN_ERR "kgdb: Another I/O driver is already "
-                                "registered with KGDB.\n");
-                return -EBUSY;
-        }
-
-        if (new_kgdb_io_ops->init) {
-                err = new_kgdb_io_ops->init();
-                if (err) {
-                        spin_unlock(&kgdb_registration_lock);
-                        return err;
-                }
-        }
-
-        kgdb_io_ops = new_kgdb_io_ops;
-
-        spin_unlock(&kgdb_registration_lock);
-
-        printk(KERN_INFO "kgdb: Registered I/O driver %s.\n",
-               new_kgdb_io_ops->name);
-
-        /* Arm KGDB now. */
-        kgdb_register_callbacks();
-
-        if (kgdb_break_asap)
-                kgdb_initial_breakpoint();
-
-        return 0;
-}
-EXPORT_SYMBOL_GPL(kgdb_register_io_module);
-
-/**
- *      kkgdb_unregister_io_module - unregister KGDB IO module
- *      @old_kgdb_io_ops: the io ops vector
- *
- *      Unregister it with the KGDB core.
- */
-void kgdb_unregister_io_module(struct kgdb_io *old_kgdb_io_ops)
-{
-        BUG_ON(kgdb_connected);
-
-        /*
-         * KGDB is no longer able to communicate out, so
-         * unregister our callbacks and reset state.
-         */
-        kgdb_unregister_callbacks();
-
-        spin_lock(&kgdb_registration_lock);
-
-        WARN_ON_ONCE(kgdb_io_ops != old_kgdb_io_ops);
-        kgdb_io_ops = NULL;
-
-        spin_unlock(&kgdb_registration_lock);
-
-        printk(KERN_INFO
-                "kgdb: Unregistered I/O driver %s, debugger disabled.\n",
-                old_kgdb_io_ops->name);
-}
-EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
-
-/**
- * kgdb_breakpoint - generate breakpoint exception
- *
- * This function will generate a breakpoint exception.  It is used at the
- * beginning of a program to sync up with a debugger and can be used
- * otherwise as a quick means to stop program execution and "break" into
- * the debugger.
- */
-void kgdb_breakpoint(void)
-{
-        atomic_inc(&kgdb_setting_breakpoint);
-        wmb(); /* Sync point before breakpoint */
-        arch_kgdb_breakpoint();
-        wmb(); /* Sync point after breakpoint */
-        atomic_dec(&kgdb_setting_breakpoint);
-}
-EXPORT_SYMBOL_GPL(kgdb_breakpoint);
-
-static int __init opt_kgdb_wait(char *str)
-{
-        kgdb_break_asap = 1;
-
-        if (kgdb_io_module_registered)
-                kgdb_initial_breakpoint();
-
-        return 0;
-}
-
-early_param("kgdbwait", opt_kgdb_wait);
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 21fe3c426948..0b624e791805 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -138,7 +138,8 @@ extern const void __start_notes __attribute__((weak));
 extern const void __stop_notes __attribute__((weak));
 #define notes_size (&__stop_notes - &__start_notes)
 
-static ssize_t notes_read(struct kobject *kobj, struct bin_attribute *bin_attr,
+static ssize_t notes_read(struct file *filp, struct kobject *kobj,
+                          struct bin_attribute *bin_attr,
                           char *buf, loff_t off, size_t count)
 {
         memcpy(buf, &__start_notes + off, count);
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index ec21304856d1..54286798c37b 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2711,6 +2711,8 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
 }
 EXPORT_SYMBOL_GPL(lockdep_init_map);
 
+struct lock_class_key __lockdep_no_validate__;
+
 /*
  * This gets called for every mutex_lock*()/spin_lock*() operation.
  * We maintain the dependency maps and validate the locking attempt:
@@ -2745,6 +2747,9 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
                 return 0;
         }
 
+        if (lock->key == &__lockdep_no_validate__)
+                check = 1;
+
         if (!subclass)
                 class = lock->class_cache;
         /*
diff --git a/kernel/module.c b/kernel/module.c
index 970d773aec62..a8014bfb5a4e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -77,6 +77,10 @@
 DEFINE_MUTEX(module_mutex);
 EXPORT_SYMBOL_GPL(module_mutex);
 static LIST_HEAD(modules);
+#ifdef CONFIG_KGDB_KDB
+struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
+#endif /* CONFIG_KGDB_KDB */
+
 
 /* Block module loading/unloading? */
 int modules_disabled = 0;
@@ -1197,7 +1201,7 @@ struct module_notes_attrs {
         struct bin_attribute attrs[0];
 };
 
-static ssize_t module_notes_read(struct kobject *kobj,
+static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
                                  struct bin_attribute *bin_attr,
                                  char *buf, loff_t pos, size_t count)
 {
diff --git a/kernel/padata.c b/kernel/padata.c
index fd03513c7327..b1c9857f8402 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -29,7 +29,7 @@
 #include <linux/rcupdate.h>
 
 #define MAX_SEQ_NR INT_MAX - NR_CPUS
-#define MAX_OBJ_NUM 10000 * NR_CPUS
+#define MAX_OBJ_NUM 1000
 
 static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index)
 {
@@ -88,7 +88,7 @@ static void padata_parallel_worker(struct work_struct *work)
         local_bh_enable();
 }
 
-/*
+/**
  * padata_do_parallel - padata parallelization function
  *
  * @pinst: padata instance
@@ -152,6 +152,23 @@ out:
 }
 EXPORT_SYMBOL(padata_do_parallel);
 
+/*
+ * padata_get_next - Get the next object that needs serialization.
+ *
+ * Return values are:
+ *
+ * A pointer to the control struct of the next object that needs
+ * serialization, if present in one of the percpu reorder queues.
+ *
+ * NULL, if all percpu reorder queues are empty.
+ *
+ * -EINPROGRESS, if the next object that needs serialization will
+ *  be parallel processed by another cpu and is not yet present in
+ *  the cpu's reorder queue.
+ *
+ * -ENODATA, if this cpu has to do the parallel processing for
+ *  the next object.
+ */
 static struct padata_priv *padata_get_next(struct parallel_data *pd)
 {
         int cpu, num_cpus, empty, calc_seq_nr;
@@ -173,7 +190,7 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
 
                 /*
                  * Calculate the seq_nr of the object that should be
-                 * next in this queue.
+                 * next in this reorder queue.
                  */
                 overrun = 0;
                 calc_seq_nr = (atomic_read(&queue->num_obj) * num_cpus)
@@ -231,7 +248,8 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
                 goto out;
         }
 
-        if (next_nr % num_cpus == next_queue->cpu_index) {
+        queue = per_cpu_ptr(pd->queue, smp_processor_id());
+        if (queue->cpu_index == next_queue->cpu_index) {
                 padata = ERR_PTR(-ENODATA);
                 goto out;
         }
@@ -247,19 +265,40 @@ static void padata_reorder(struct parallel_data *pd)
         struct padata_queue *queue;
         struct padata_instance *pinst = pd->pinst;
 
-try_again:
+        /*
+         * We need to ensure that only one cpu can work on dequeueing of
+         * the reorder queue the time. Calculating in which percpu reorder
+         * queue the next object will arrive takes some time. A spinlock
+         * would be highly contended. Also it is not clear in which order
+         * the objects arrive to the reorder queues. So a cpu could wait to
+         * get the lock just to notice that there is nothing to do at the
+         * moment. Therefore we use a trylock and let the holder of the lock
+         * care for all the objects enqueued during the holdtime of the lock.
+         */
         if (!spin_trylock_bh(&pd->lock))
-                goto out;
+                return;
 
         while (1) {
                 padata = padata_get_next(pd);
 
+                /*
+                 * All reorder queues are empty, or the next object that needs
+                 * serialization is parallel processed by another cpu and is
+                 * still on it's way to the cpu's reorder queue, nothing to
+                 * do for now.
+                 */
                 if (!padata || PTR_ERR(padata) == -EINPROGRESS)
                         break;
 
+                /*
+                 * This cpu has to do the parallel processing of the next
+                 * object. It's waiting in the cpu's parallelization queue,
+                 * so exit imediately.
+                 */
                 if (PTR_ERR(padata) == -ENODATA) {
+                        del_timer(&pd->timer);
                         spin_unlock_bh(&pd->lock);
-                        goto out;
+                        return;
                 }
 
                 queue = per_cpu_ptr(pd->queue, padata->cb_cpu);
@@ -273,13 +312,27 @@ try_again:
 
         spin_unlock_bh(&pd->lock);
 
-        if (atomic_read(&pd->reorder_objects))
-                goto try_again;
+        /*
+         * The next object that needs serialization might have arrived to
+         * the reorder queues in the meantime, we will be called again
+         * from the timer function if noone else cares for it.
+         */
+        if (atomic_read(&pd->reorder_objects)
+                        && !(pinst->flags & PADATA_RESET))
+                mod_timer(&pd->timer, jiffies + HZ);
+        else
+                del_timer(&pd->timer);
 
-out:
         return;
 }
 
+static void padata_reorder_timer(unsigned long arg)
+{
+        struct parallel_data *pd = (struct parallel_data *)arg;
+
+        padata_reorder(pd);
+}
+
 static void padata_serial_worker(struct work_struct *work)
 {
         struct padata_queue *queue;
@@ -308,7 +361,7 @@ static void padata_serial_worker(struct work_struct *work)
         local_bh_enable();
 }
 
-/*
+/**
  * padata_do_serial - padata serialization function
  *
  * @padata: object to be serialized.
@@ -338,6 +391,7 @@ void padata_do_serial(struct padata_priv *padata)
 }
 EXPORT_SYMBOL(padata_do_serial);
 
+/* Allocate and initialize the internal cpumask dependend resources. */
 static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
                                              const struct cpumask *cpumask)
 {
@@ -358,17 +412,15 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
         if (!alloc_cpumask_var(&pd->cpumask, GFP_KERNEL))
                 goto err_free_queue;
 
-        for_each_possible_cpu(cpu) {
+        cpumask_and(pd->cpumask, cpumask, cpu_active_mask);
+
+        for_each_cpu(cpu, pd->cpumask) {
                 queue = per_cpu_ptr(pd->queue, cpu);
 
                 queue->pd = pd;
 
-                if (cpumask_test_cpu(cpu, cpumask)
-                    && cpumask_test_cpu(cpu, cpu_active_mask)) {
-                        queue->cpu_index = cpu_index;
-                        cpu_index++;
-                } else
-                        queue->cpu_index = -1;
+                queue->cpu_index = cpu_index;
+                cpu_index++;
 
                 INIT_LIST_HEAD(&queue->reorder.list);
                 INIT_LIST_HEAD(&queue->parallel.list);
@@ -382,11 +434,10 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
                 atomic_set(&queue->num_obj, 0);
         }
 
-        cpumask_and(pd->cpumask, cpumask, cpu_active_mask);
-
         num_cpus = cpumask_weight(pd->cpumask);
         pd->max_seq_nr = (MAX_SEQ_NR / num_cpus) * num_cpus - 1;
 
+        setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd);
         atomic_set(&pd->seq_nr, -1);
         atomic_set(&pd->reorder_objects, 0);
         atomic_set(&pd->refcnt, 0);
@@ -410,6 +461,31 @@ static void padata_free_pd(struct parallel_data *pd)
         kfree(pd);
 }
 
+/* Flush all objects out of the padata queues. */
+static void padata_flush_queues(struct parallel_data *pd)
+{
+        int cpu;
+        struct padata_queue *queue;
+
+        for_each_cpu(cpu, pd->cpumask) {
+                queue = per_cpu_ptr(pd->queue, cpu);
+                flush_work(&queue->pwork);
+        }
+
+        del_timer_sync(&pd->timer);
+
+        if (atomic_read(&pd->reorder_objects))
+                padata_reorder(pd);
+
+        for_each_cpu(cpu, pd->cpumask) {
+                queue = per_cpu_ptr(pd->queue, cpu);
+                flush_work(&queue->swork);
+        }
+
+        BUG_ON(atomic_read(&pd->refcnt) != 0);
+}
+
+/* Replace the internal control stucture with a new one. */
 static void padata_replace(struct padata_instance *pinst,
                            struct parallel_data *pd_new)
 {
@@ -421,17 +497,13 @@ static void padata_replace(struct padata_instance *pinst,
 
         synchronize_rcu();
 
-        while (atomic_read(&pd_old->refcnt) != 0)
-                yield();
-
-        flush_workqueue(pinst->wq);
-
+        padata_flush_queues(pd_old);
         padata_free_pd(pd_old);
 
         pinst->flags &= ~PADATA_RESET;
 }
 
-/*
+/**
  * padata_set_cpumask - set the cpumask that padata should use
  *
  * @pinst: padata instance
@@ -443,10 +515,10 @@ int padata_set_cpumask(struct padata_instance *pinst,
         struct parallel_data *pd;
         int err = 0;
 
-        might_sleep();
-
         mutex_lock(&pinst->lock);
 
+        get_online_cpus();
+
         pd = padata_alloc_pd(pinst, cpumask);
         if (!pd) {
                 err = -ENOMEM;
@@ -458,6 +530,8 @@ int padata_set_cpumask(struct padata_instance *pinst,
         padata_replace(pinst, pd);
 
 out:
+        put_online_cpus();
+
         mutex_unlock(&pinst->lock);
 
         return err;
@@ -479,7 +553,7 @@ static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
         return 0;
 }
 
-/*
+/**
  * padata_add_cpu - add a cpu to the padata cpumask
  *
  * @pinst: padata instance
@@ -489,12 +563,12 @@ int padata_add_cpu(struct padata_instance *pinst, int cpu)
 {
         int err;
 
-        might_sleep();
-
         mutex_lock(&pinst->lock);
 
+        get_online_cpus();
         cpumask_set_cpu(cpu, pinst->cpumask);
         err = __padata_add_cpu(pinst, cpu);
+        put_online_cpus();
 
         mutex_unlock(&pinst->lock);
 
@@ -517,7 +591,7 @@ static int __padata_remove_cpu(struct padata_instance *pinst, int cpu)
         return 0;
 }
 
-/*
+/**
  * padata_remove_cpu - remove a cpu from the padata cpumask
  *
  * @pinst: padata instance
@@ -527,12 +601,12 @@ int padata_remove_cpu(struct padata_instance *pinst, int cpu)
 {
         int err;
 
-        might_sleep();
-
         mutex_lock(&pinst->lock);
 
+        get_online_cpus();
         cpumask_clear_cpu(cpu, pinst->cpumask);
         err = __padata_remove_cpu(pinst, cpu);
+        put_online_cpus();
 
         mutex_unlock(&pinst->lock);
 
@@ -540,38 +614,35 @@ int padata_remove_cpu(struct padata_instance *pinst, int cpu)
 }
 EXPORT_SYMBOL(padata_remove_cpu);
 
-/*
+/**
  * padata_start - start the parallel processing
  *
  * @pinst: padata instance to start
  */
 void padata_start(struct padata_instance *pinst)
 {
-        might_sleep();
-
         mutex_lock(&pinst->lock);
         pinst->flags |= PADATA_INIT;
         mutex_unlock(&pinst->lock);
 }
 EXPORT_SYMBOL(padata_start);
 
-/*
+/**
  * padata_stop - stop the parallel processing
  *
  * @pinst: padata instance to stop
  */
 void padata_stop(struct padata_instance *pinst)
 {
-        might_sleep();
-
         mutex_lock(&pinst->lock);
         pinst->flags &= ~PADATA_INIT;
         mutex_unlock(&pinst->lock);
 }
 EXPORT_SYMBOL(padata_stop);
 
-static int __cpuinit padata_cpu_callback(struct notifier_block *nfb,
-                                         unsigned long action, void *hcpu)
+#ifdef CONFIG_HOTPLUG_CPU
+static int padata_cpu_callback(struct notifier_block *nfb,
+                               unsigned long action, void *hcpu)
 {
         int err;
         struct padata_instance *pinst;
@@ -621,8 +692,9 @@ static int __cpuinit padata_cpu_callback(struct notifier_block *nfb,
 
         return NOTIFY_OK;
 }
+#endif
 
-/*
+/**
  * padata_alloc - allocate and initialize a padata instance
  *
  * @cpumask: cpumask that padata uses for parallelization
@@ -631,7 +703,6 @@ static int __cpuinit padata_cpu_callback(struct notifier_block *nfb,
 struct padata_instance *padata_alloc(const struct cpumask *cpumask,
                                      struct workqueue_struct *wq)
 {
-        int err;
         struct padata_instance *pinst;
         struct parallel_data *pd;
 
@@ -639,6 +710,8 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
         if (!pinst)
                 goto err;
 
+        get_online_cpus();
+
         pd = padata_alloc_pd(pinst, cpumask);
         if (!pd)
                 goto err_free_inst;
@@ -654,31 +727,32 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
 
         pinst->flags = 0;
 
+#ifdef CONFIG_HOTPLUG_CPU
         pinst->cpu_notifier.notifier_call = padata_cpu_callback;
         pinst->cpu_notifier.priority = 0;
-        err = register_hotcpu_notifier(&pinst->cpu_notifier);
-        if (err)
-                goto err_free_cpumask;
+        register_hotcpu_notifier(&pinst->cpu_notifier);
+#endif
+
+        put_online_cpus();
 
         mutex_init(&pinst->lock);
 
         return pinst;
 
-err_free_cpumask:
-        free_cpumask_var(pinst->cpumask);
 err_free_pd:
         padata_free_pd(pd);
 err_free_inst:
         kfree(pinst);
+        put_online_cpus();
 err:
         return NULL;
 }
 EXPORT_SYMBOL(padata_alloc);
 
-/*
+/**
  * padata_free - free a padata instance
  *
- * @ padata_inst: padata instance to free
+ * @padata_inst: padata instance to free
  */
 void padata_free(struct padata_instance *pinst)
 {
@@ -686,10 +760,13 @@ void padata_free(struct padata_instance *pinst)
 
         synchronize_rcu();
 
-        while (atomic_read(&pinst->pd->refcnt) != 0)
-                yield();
-
+#ifdef CONFIG_HOTPLUG_CPU
         unregister_hotcpu_notifier(&pinst->cpu_notifier);
+#endif
+        get_online_cpus();
+        padata_flush_queues(pinst->pd);
+        put_online_cpus();
+
         padata_free_pd(pinst->pd);
         free_cpumask_var(pinst->cpumask);
         kfree(pinst);
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index 3db49b9ca374..f42d3f737a33 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -2,7 +2,7 @@
  * This module exposes the interface to kernel space for specifying
  * QoS dependencies.  It provides infrastructure for registration of:
  *
- * Dependents on a QoS value : register requirements
+ * Dependents on a QoS value : register requests
  * Watchers of QoS value : get notified when target QoS value changes
  *
  * This QoS design is best effort based.  Dependents register their QoS needs.
@@ -14,19 +14,21 @@
  * timeout: usec <-- currently not used.
  * throughput: kbs (kilo byte / sec)
  *
- * There are lists of pm_qos_objects each one wrapping requirements, notifiers
+ * There are lists of pm_qos_objects each one wrapping requests, notifiers
  *
- * User mode requirements on a QOS parameter register themselves to the
+ * User mode requests on a QOS parameter register themselves to the
  * subsystem by opening the device node /dev/... and writing there request to
  * the node.  As long as the process holds a file handle open to the node the
  * client continues to be accounted for.  Upon file release the usermode
- * requirement is removed and a new qos target is computed.  This way when the
- * requirement that the application has is cleaned up when closes the file
+ * request is removed and a new qos target is computed.  This way when the
+ * request that the application has is cleaned up when closes the file
  * pointer or exits the pm_qos_object will get an opportunity to clean up.
  *
  * Mark Gross <mgross@linux.intel.com>
  */
 
+/*#define DEBUG*/
+
 #include <linux/pm_qos_params.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
@@ -42,25 +44,25 @@
 #include <linux/uaccess.h>
 
 /*
- * locking rule: all changes to requirements or notifiers lists
+ * locking rule: all changes to requests or notifiers lists
  * or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
  * held, taken with _irqsave.  One lock to rule them all
  */
-struct requirement_list {
+struct pm_qos_request_list {
         struct list_head list;
         union {
                 s32 value;
                 s32 usec;
                 s32 kbps;
         };
-        char *name;
+        int pm_qos_class;
 };
 
 static s32 max_compare(s32 v1, s32 v2);
 static s32 min_compare(s32 v1, s32 v2);
 
 struct pm_qos_object {
-        struct requirement_list requirements;
+        struct pm_qos_request_list requests;
         struct blocking_notifier_head *notifiers;
         struct miscdevice pm_qos_power_miscdev;
         char *name;
@@ -72,7 +74,7 @@ struct pm_qos_object {
 static struct pm_qos_object null_pm_qos;
 static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
 static struct pm_qos_object cpu_dma_pm_qos = {
-        .requirements = {LIST_HEAD_INIT(cpu_dma_pm_qos.requirements.list)},
+        .requests = {LIST_HEAD_INIT(cpu_dma_pm_qos.requests.list)},
         .notifiers = &cpu_dma_lat_notifier,
         .name = "cpu_dma_latency",
         .default_value = 2000 * USEC_PER_SEC,
@@ -82,7 +84,7 @@ static struct pm_qos_object cpu_dma_pm_qos = {
 
 static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
 static struct pm_qos_object network_lat_pm_qos = {
-        .requirements = {LIST_HEAD_INIT(network_lat_pm_qos.requirements.list)},
+        .requests = {LIST_HEAD_INIT(network_lat_pm_qos.requests.list)},
         .notifiers = &network_lat_notifier,
         .name = "network_latency",
         .default_value = 2000 * USEC_PER_SEC,
@@ -93,8 +95,7 @@ static struct pm_qos_object network_lat_pm_qos = {
 
 static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
 static struct pm_qos_object network_throughput_pm_qos = {
-        .requirements =
-                {LIST_HEAD_INIT(network_throughput_pm_qos.requirements.list)},
+        .requests = {LIST_HEAD_INIT(network_throughput_pm_qos.requests.list)},
         .notifiers = &network_throughput_notifier,
         .name = "network_throughput",
         .default_value = 0,
@@ -135,31 +136,34 @@ static s32 min_compare(s32 v1, s32 v2)
 }
 
 
-static void update_target(int target)
+static void update_target(int pm_qos_class)
 {
         s32 extreme_value;
-        struct requirement_list *node;
+        struct pm_qos_request_list *node;
         unsigned long flags;
         int call_notifier = 0;
 
         spin_lock_irqsave(&pm_qos_lock, flags);
-        extreme_value = pm_qos_array[target]->default_value;
+        extreme_value = pm_qos_array[pm_qos_class]->default_value;
         list_for_each_entry(node,
-                        &pm_qos_array[target]->requirements.list, list) {
-                extreme_value = pm_qos_array[target]->comparitor(
+                        &pm_qos_array[pm_qos_class]->requests.list, list) {
+                extreme_value = pm_qos_array[pm_qos_class]->comparitor(
                                 extreme_value, node->value);
         }
-        if (atomic_read(&pm_qos_array[target]->target_value) != extreme_value) {
+        if (atomic_read(&pm_qos_array[pm_qos_class]->target_value) !=
+                        extreme_value) {
                 call_notifier = 1;
-                atomic_set(&pm_qos_array[target]->target_value, extreme_value);
-                pr_debug(KERN_ERR "new target for qos %d is %d\n", target,
-                        atomic_read(&pm_qos_array[target]->target_value));
+                atomic_set(&pm_qos_array[pm_qos_class]->target_value,
+                                extreme_value);
+                pr_debug(KERN_ERR "new target for qos %d is %d\n", pm_qos_class,
+                        atomic_read(&pm_qos_array[pm_qos_class]->target_value));
         }
         spin_unlock_irqrestore(&pm_qos_lock, flags);
 
         if (call_notifier)
-                blocking_notifier_call_chain(pm_qos_array[target]->notifiers,
-                        (unsigned long) extreme_value, NULL);
+                blocking_notifier_call_chain(
+                                pm_qos_array[pm_qos_class]->notifiers,
+                                        (unsigned long) extreme_value, NULL);
 }
 
 static int register_pm_qos_misc(struct pm_qos_object *qos)
@@ -185,125 +189,112 @@ static int find_pm_qos_object_by_minor(int minor)
 }
 
 /**
- * pm_qos_requirement - returns current system wide qos expectation
+ * pm_qos_request - returns current system wide qos expectation
  * @pm_qos_class: identification of which qos value is requested
  *
  * This function returns the current target value in an atomic manner.
  */
-int pm_qos_requirement(int pm_qos_class)
+int pm_qos_request(int pm_qos_class)
 {
         return atomic_read(&pm_qos_array[pm_qos_class]->target_value);
 }
-EXPORT_SYMBOL_GPL(pm_qos_requirement);
+EXPORT_SYMBOL_GPL(pm_qos_request);
 
 /**
- * pm_qos_add_requirement - inserts new qos request into the list
+ * pm_qos_add_request - inserts new qos request into the list
  * @pm_qos_class: identifies which list of qos request to us
- * @name: identifies the request
  * @value: defines the qos request
  *
  * This function inserts a new entry in the pm_qos_class list of requested qos
  * performance characteristics.  It recomputes the aggregate QoS expectations
- * for the pm_qos_class of parameters.
+ * for the pm_qos_class of parameters, and returns the pm_qos_request list
+ * element as a handle for use in updating and removal.  Call needs to save
+ * this handle for later use.
  */
-int pm_qos_add_requirement(int pm_qos_class, char *name, s32 value)
+struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value)
 {
-        struct requirement_list *dep;
+        struct pm_qos_request_list *dep;
         unsigned long flags;
 
-        dep = kzalloc(sizeof(struct requirement_list), GFP_KERNEL);
+        dep = kzalloc(sizeof(struct pm_qos_request_list), GFP_KERNEL);
         if (dep) {
                 if (value == PM_QOS_DEFAULT_VALUE)
                         dep->value = pm_qos_array[pm_qos_class]->default_value;
                 else
                         dep->value = value;
-                dep->name = kstrdup(name, GFP_KERNEL);
-                if (!dep->name)
-                        goto cleanup;
+                dep->pm_qos_class = pm_qos_class;
 
                 spin_lock_irqsave(&pm_qos_lock, flags);
                 list_add(&dep->list,
-                        &pm_qos_array[pm_qos_class]->requirements.list);
+                        &pm_qos_array[pm_qos_class]->requests.list);
                 spin_unlock_irqrestore(&pm_qos_lock, flags);
                 update_target(pm_qos_class);
-
-                return 0;
         }
 
-cleanup:
-        kfree(dep);
-        return -ENOMEM;
+        return dep;
 }
-EXPORT_SYMBOL_GPL(pm_qos_add_requirement);
+EXPORT_SYMBOL_GPL(pm_qos_add_request);
 
 /**
- * pm_qos_update_requirement - modifies an existing qos request
- * @pm_qos_class: identifies which list of qos request to us
- * @name: identifies the request
+ * pm_qos_update_request - modifies an existing qos request
+ * @pm_qos_req : handle to list element holding a pm_qos request to use
  * @value: defines the qos request
  *
- * Updates an existing qos requirement for the pm_qos_class of parameters along
+ * Updates an existing qos request for the pm_qos_class of parameters along
  * with updating the target pm_qos_class value.
  *
- * If the named request isn't in the list then no change is made.
+ * Attempts are made to make this code callable on hot code paths.
  */
-int pm_qos_update_requirement(int pm_qos_class, char *name, s32 new_value)
+void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
+                s32 new_value)
 {
         unsigned long flags;
-        struct requirement_list *node;
         int pending_update = 0;
+        s32 temp;
 
-        spin_lock_irqsave(&pm_qos_lock, flags);
-        list_for_each_entry(node,
-                &pm_qos_array[pm_qos_class]->requirements.list, list) {
-                if (strcmp(node->name, name) == 0) {
-                        if (new_value == PM_QOS_DEFAULT_VALUE)
-                                node->value =
-                                pm_qos_array[pm_qos_class]->default_value;
-                        else
-                                node->value = new_value;
+        if (pm_qos_req) { /*guard against callers passing in null */
+                spin_lock_irqsave(&pm_qos_lock, flags);
+                if (new_value == PM_QOS_DEFAULT_VALUE)
+                        temp = pm_qos_array[pm_qos_req->pm_qos_class]->default_value;
+                else
+                        temp = new_value;
+
+                if (temp != pm_qos_req->value) {
                         pending_update = 1;
-                        break;
+                        pm_qos_req->value = temp;
                 }
+                spin_unlock_irqrestore(&pm_qos_lock, flags);
+                if (pending_update)
+                        update_target(pm_qos_req->pm_qos_class);
         }
-        spin_unlock_irqrestore(&pm_qos_lock, flags);
-        if (pending_update)
-                update_target(pm_qos_class);
-
-        return 0;
 }
-EXPORT_SYMBOL_GPL(pm_qos_update_requirement);
+EXPORT_SYMBOL_GPL(pm_qos_update_request);
 
 /**
- * pm_qos_remove_requirement - modifies an existing qos request
- * @pm_qos_class: identifies which list of qos request to us
- * @name: identifies the request
+ * pm_qos_remove_request - modifies an existing qos request
+ * @pm_qos_req: handle to request list element
  *
- * Will remove named qos request from pm_qos_class list of parameters and
- * recompute the current target value for the pm_qos_class.
+ * Will remove pm qos request from the list of requests and
+ * recompute the current target value for the pm_qos_class.  Call this
+ * on slow code paths.
  */
-void pm_qos_remove_requirement(int pm_qos_class, char *name)
+void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req)
 {
         unsigned long flags;
-        struct requirement_list *node;
-        int pending_update = 0;
+        int qos_class;
 
+        if (pm_qos_req == NULL)
+                return;
+                /* silent return to keep pcm code cleaner */
+
+        qos_class = pm_qos_req->pm_qos_class;
         spin_lock_irqsave(&pm_qos_lock, flags);
-        list_for_each_entry(node,
-                &pm_qos_array[pm_qos_class]->requirements.list, list) {
-                if (strcmp(node->name, name) == 0) {
-                        kfree(node->name);
-                        list_del(&node->list);
-                        kfree(node);
-                        pending_update = 1;
-                        break;
-                }
-        }
+        list_del(&pm_qos_req->list);
+        kfree(pm_qos_req);
         spin_unlock_irqrestore(&pm_qos_lock, flags);
-        if (pending_update)
-                update_target(pm_qos_class);
+        update_target(qos_class);
 }
-EXPORT_SYMBOL_GPL(pm_qos_remove_requirement);
+EXPORT_SYMBOL_GPL(pm_qos_remove_request);
 
 /**
  * pm_qos_add_notifier - sets notification entry for changes to target value
@@ -313,7 +304,7 @@ EXPORT_SYMBOL_GPL(pm_qos_remove_requirement);
  * will register the notifier into a notification chain that gets called
  * upon changes to the pm_qos_class target value.
  */
- int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
+int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
 {
         int retval;
 
@@ -343,21 +334,16 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
 }
 EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
 
-#define PID_NAME_LEN 32
-
 static int pm_qos_power_open(struct inode *inode, struct file *filp)
 {
-        int ret;
         long pm_qos_class;
-        char name[PID_NAME_LEN];
 
         pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
         if (pm_qos_class >= 0) {
-                filp->private_data = (void *)pm_qos_class;
-                snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
-                ret = pm_qos_add_requirement(pm_qos_class, name,
-                                        PM_QOS_DEFAULT_VALUE);
-                if (ret >= 0)
+                filp->private_data = (void *) pm_qos_add_request(pm_qos_class,
+                                PM_QOS_DEFAULT_VALUE);
+
+                if (filp->private_data)
                         return 0;
         }
         return -EPERM;
@@ -365,32 +351,40 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
 
 static int pm_qos_power_release(struct inode *inode, struct file *filp)
 {
-        int pm_qos_class;
-        char name[PID_NAME_LEN];
+        struct pm_qos_request_list *req;
 
-        pm_qos_class = (long)filp->private_data;
-        snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
-        pm_qos_remove_requirement(pm_qos_class, name);
+        req = (struct pm_qos_request_list *)filp->private_data;
+        pm_qos_remove_request(req);
 
         return 0;
 }
 
+
 static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
                 size_t count, loff_t *f_pos)
 {
         s32 value;
-        int pm_qos_class;
-        char name[PID_NAME_LEN];
-
-        pm_qos_class = (long)filp->private_data;
-        if (count != sizeof(s32))
+        int x;
+        char ascii_value[11];
+        struct pm_qos_request_list *pm_qos_req;
+
+        if (count == sizeof(s32)) {
+                if (copy_from_user(&value, buf, sizeof(s32)))
+                        return -EFAULT;
+        } else if (count == 11) { /* len('0x12345678/0') */
+                if (copy_from_user(ascii_value, buf, 11))
+                        return -EFAULT;
+                x = sscanf(ascii_value, "%x", &value);
+                if (x != 1)
+                        return -EINVAL;
+                pr_debug(KERN_ERR "%s, %d, 0x%x\n", ascii_value, x, value);
+        } else
                 return -EINVAL;
-        if (copy_from_user(&value, buf, sizeof(s32)))
-                return -EFAULT;
-        snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
-        pm_qos_update_requirement(pm_qos_class, name, value);
 
-        return  sizeof(s32);
+        pm_qos_req = (struct pm_qos_request_list *)filp->private_data;
+        pm_qos_update_request(pm_qos_req, value);
+
+        return count;
 }
 
 
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index bc7704b3a443..00bb252f29a2 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -11,19 +11,18 @@
 #include <trace/events/timer.h>
 
 /*
- * Called after updating RLIMIT_CPU to set timer expiration if necessary.
+ * Called after updating RLIMIT_CPU to run cpu timer and update
+ * tsk->signal->cputime_expires expiration cache if necessary. Needs
+ * siglock protection since other code may update expiration cache as
+ * well.
  */
 void update_rlimit_cpu(unsigned long rlim_new)
 {
         cputime_t cputime = secs_to_cputime(rlim_new);
-        struct signal_struct *const sig = current->signal;
 
-        if (cputime_eq(sig->it[CPUCLOCK_PROF].expires, cputime_zero) ||
-            cputime_gt(sig->it[CPUCLOCK_PROF].expires, cputime)) {
-                spin_lock_irq(&current->sighand->siglock);
-                set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
-                spin_unlock_irq(&current->sighand->siglock);
-        }
+        spin_lock_irq(&current->sighand->siglock);
+        set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
+        spin_unlock_irq(&current->sighand->siglock);
 }
 
 static int check_clock(const clockid_t which_clock)
@@ -548,111 +547,62 @@ static inline int expires_gt(cputime_t expires, cputime_t new_exp)
                cputime_gt(expires, new_exp);
 }
 
-static inline int expires_le(cputime_t expires, cputime_t new_exp)
-{
-        return !cputime_eq(expires, cputime_zero) &&
-               cputime_le(expires, new_exp);
-}
 /*
  * Insert the timer on the appropriate list before any timers that
  * expire later.  This must be called with the tasklist_lock held
- * for reading, and interrupts disabled.
+ * for reading, interrupts disabled and p->sighand->siglock taken.
  */
-static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
+static void arm_timer(struct k_itimer *timer)
 {
         struct task_struct *p = timer->it.cpu.task;
         struct list_head *head, *listpos;
+        struct task_cputime *cputime_expires;
         struct cpu_timer_list *const nt = &timer->it.cpu;
         struct cpu_timer_list *next;
-        unsigned long i;
 
-        head = (CPUCLOCK_PERTHREAD(timer->it_clock) ?
-                p->cpu_timers : p->signal->cpu_timers);
+        if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
+                head = p->cpu_timers;
+                cputime_expires = &p->cputime_expires;
+        } else {
+                head = p->signal->cpu_timers;
+                cputime_expires = &p->signal->cputime_expires;
+        }
         head += CPUCLOCK_WHICH(timer->it_clock);
 
-        BUG_ON(!irqs_disabled());
-        spin_lock(&p->sighand->siglock);
-
         listpos = head;
-        if (CPUCLOCK_WHICH(timer->it_clock) == CPUCLOCK_SCHED) {
-                list_for_each_entry(next, head, entry) {
-                        if (next->expires.sched > nt->expires.sched)
-                                break;
-                        listpos = &next->entry;
-                }
-        } else {
-                list_for_each_entry(next, head, entry) {
-                        if (cputime_gt(next->expires.cpu, nt->expires.cpu))
-                                break;
-                        listpos = &next->entry;
-                }
+        list_for_each_entry(next, head, entry) {
+                if (cpu_time_before(timer->it_clock, nt->expires, next->expires))
+                        break;
+                listpos = &next->entry;
         }
         list_add(&nt->entry, listpos);
 
         if (listpos == head) {
+                union cpu_time_count *exp = &nt->expires;
+
                 /*
-                 * We are the new earliest-expiring timer.
-                 * If we are a thread timer, there can always
-                 * be a process timer telling us to stop earlier.
+                 * We are the new earliest-expiring POSIX 1.b timer, hence
+                 * need to update expiration cache. Take into account that
+                 * for process timers we share expiration cache with itimers
+                 * and RLIMIT_CPU and for thread timers with RLIMIT_RTTIME.
                  */
 
-                if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
-                        union cpu_time_count *exp = &nt->expires;
-
-                        switch (CPUCLOCK_WHICH(timer->it_clock)) {
-                        default:
-                                BUG();
-                        case CPUCLOCK_PROF:
-                                if (expires_gt(p->cputime_expires.prof_exp,
-                                               exp->cpu))
-                                        p->cputime_expires.prof_exp = exp->cpu;
-                                break;
-                        case CPUCLOCK_VIRT:
-                                if (expires_gt(p->cputime_expires.virt_exp,
-                                               exp->cpu))
-                                        p->cputime_expires.virt_exp = exp->cpu;
-                                break;
-                        case CPUCLOCK_SCHED:
-                                if (p->cputime_expires.sched_exp == 0 ||
-                                    p->cputime_expires.sched_exp > exp->sched)
-                                        p->cputime_expires.sched_exp =
-                                                                exp->sched;
-                                break;
-                        }
-                } else {
-                        struct signal_struct *const sig = p->signal;
-                        union cpu_time_count *exp = &timer->it.cpu.expires;
-
-                        /*
-                         * For a process timer, set the cached expiration time.
-                         */
-                        switch (CPUCLOCK_WHICH(timer->it_clock)) {
-                        default:
-                                BUG();
-                        case CPUCLOCK_VIRT:
-                                if (expires_le(sig->it[CPUCLOCK_VIRT].expires,
-                                               exp->cpu))
-                                        break;
-                                sig->cputime_expires.virt_exp = exp->cpu;
-                                break;
-                        case CPUCLOCK_PROF:
-                                if (expires_le(sig->it[CPUCLOCK_PROF].expires,
-                                               exp->cpu))
-                                        break;
-                                i = sig->rlim[RLIMIT_CPU].rlim_cur;
-                                if (i != RLIM_INFINITY &&
-                                    i <= cputime_to_secs(exp->cpu))
-                                        break;
-                                sig->cputime_expires.prof_exp = exp->cpu;
-                                break;
-                        case CPUCLOCK_SCHED:
-                                sig->cputime_expires.sched_exp = exp->sched;
-                                break;
-                        }
+                switch (CPUCLOCK_WHICH(timer->it_clock)) {
+                case CPUCLOCK_PROF:
+                        if (expires_gt(cputime_expires->prof_exp, exp->cpu))
+                                cputime_expires->prof_exp = exp->cpu;
+                        break;
+                case CPUCLOCK_VIRT:
+                        if (expires_gt(cputime_expires->virt_exp, exp->cpu))
+                                cputime_expires->virt_exp = exp->cpu;
+                        break;
+                case CPUCLOCK_SCHED:
+                        if (cputime_expires->sched_exp == 0 ||
+                            cputime_expires->sched_exp > exp->sched)
+                                cputime_expires->sched_exp = exp->sched;
+                        break;
                 }
         }
-
-        spin_unlock(&p->sighand->siglock);
 }
 
 /*
@@ -660,7 +610,12 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
  */
 static void cpu_timer_fire(struct k_itimer *timer)
 {
-        if (unlikely(timer->sigq == NULL)) {
+        if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) {
+                /*
+                 * User don't want any signal.
+                 */
+                timer->it.cpu.expires.sched = 0;
+        } else if (unlikely(timer->sigq == NULL)) {
                 /*
                  * This a special case for clock_nanosleep,
                  * not a normal timer from sys_timer_create.
@@ -721,7 +676,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                         struct itimerspec *new, struct itimerspec *old)
 {
         struct task_struct *p = timer->it.cpu.task;
-        union cpu_time_count old_expires, new_expires, val;
+        union cpu_time_count old_expires, new_expires, old_incr, val;
         int ret;
 
         if (unlikely(p == NULL)) {
@@ -752,6 +707,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
         BUG_ON(!irqs_disabled());
 
         ret = 0;
+        old_incr = timer->it.cpu.incr;
         spin_lock(&p->sighand->siglock);
         old_expires = timer->it.cpu.expires;
         if (unlikely(timer->it.cpu.firing)) {
@@ -759,7 +715,6 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                 ret = TIMER_RETRY;
         } else
                 list_del_init(&timer->it.cpu.entry);
-        spin_unlock(&p->sighand->siglock);
 
         /*
          * We need to sample the current value to convert the new
@@ -813,6 +768,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                  * disable this firing since we are already reporting
                  * it as an overrun (thanks to bump_cpu_timer above).
                  */
+                spin_unlock(&p->sighand->siglock);
                 read_unlock(&tasklist_lock);
                 goto out;
         }
@@ -828,11 +784,11 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
          */
         timer->it.cpu.expires = new_expires;
         if (new_expires.sched != 0 &&
-            (timer->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE &&
             cpu_time_before(timer->it_clock, val, new_expires)) {
-                arm_timer(timer, val);
+                arm_timer(timer);
         }
 
+        spin_unlock(&p->sighand->siglock);
         read_unlock(&tasklist_lock);
 
         /*
@@ -853,7 +809,6 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
         timer->it_overrun = -1;
 
         if (new_expires.sched != 0 &&
-            (timer->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE &&
             !cpu_time_before(timer->it_clock, val, new_expires)) {
                 /*
                  * The designated time already passed, so we notify
@@ -867,7 +822,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
  out:
         if (old) {
                 sample_to_timespec(timer->it_clock,
-                                   timer->it.cpu.incr, &old->it_interval);
+                                   old_incr, &old->it_interval);
         }
         return ret;
 }
@@ -927,25 +882,6 @@ void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
                 read_unlock(&tasklist_lock);
         }
 
-        if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) {
-                if (timer->it.cpu.incr.sched == 0 &&
-                    cpu_time_before(timer->it_clock,
-                                    timer->it.cpu.expires, now)) {
-                        /*
-                         * Do-nothing timer expired and has no reload,
-                         * so it's as if it was never set.
-                         */
-                        timer->it.cpu.expires.sched = 0;
-                        itp->it_value.tv_sec = itp->it_value.tv_nsec = 0;
-                        return;
-                }
-                /*
-                 * Account for any expirations and reloads that should
-                 * have happened.
-                 */
-                bump_cpu_timer(timer, now);
-        }
-
         if (unlikely(clear_dead)) {
                 /*
                  * We've noticed that the thread is dead, but
@@ -1066,16 +1002,9 @@ static void stop_process_timers(struct signal_struct *sig)
         struct thread_group_cputimer *cputimer = &sig->cputimer;
         unsigned long flags;
 
-        if (!cputimer->running)
-                return;
-
         spin_lock_irqsave(&cputimer->lock, flags);
         cputimer->running = 0;
         spin_unlock_irqrestore(&cputimer->lock, flags);
-
-        sig->cputime_expires.prof_exp = cputime_zero;
-        sig->cputime_expires.virt_exp = cputime_zero;
-        sig->cputime_expires.sched_exp = 0;
 }
 
 static u32 onecputick;
@@ -1112,6 +1041,23 @@ static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
         }
 }
 
+/**
+ * task_cputime_zero - Check a task_cputime struct for all zero fields.
+ *
+ * @cputime:    The struct to compare.
+ *
+ * Checks @cputime to see if all fields are zero.  Returns true if all fields
+ * are zero, false if any field is nonzero.
+ */
+static inline int task_cputime_zero(const struct task_cputime *cputime)
+{
+        if (cputime_eq(cputime->utime, cputime_zero) &&
+            cputime_eq(cputime->stime, cputime_zero) &&
+            cputime->sum_exec_runtime == 0)
+                return 1;
+        return 0;
+}
+
 /*
  * Check for any per-thread CPU timers that have fired and move them
  * off the tsk->*_timers list onto the firing list.  Per-thread timers
@@ -1129,19 +1075,6 @@ static void check_process_timers(struct task_struct *tsk,
         unsigned long soft;
 
         /*
-         * Don't sample the current process CPU clocks if there are no timers.
-         */
-        if (list_empty(&timers[CPUCLOCK_PROF]) &&
-            cputime_eq(sig->it[CPUCLOCK_PROF].expires, cputime_zero) &&
-            sig->rlim[RLIMIT_CPU].rlim_cur == RLIM_INFINITY &&
-            list_empty(&timers[CPUCLOCK_VIRT]) &&
-            cputime_eq(sig->it[CPUCLOCK_VIRT].expires, cputime_zero) &&
-            list_empty(&timers[CPUCLOCK_SCHED])) {
-                stop_process_timers(sig);
-                return;
-        }
-
-        /*
          * Collect the current process totals.
          */
         thread_group_cputimer(tsk, &cputime);
@@ -1230,18 +1163,11 @@ static void check_process_timers(struct task_struct *tsk,
                 }
         }
 
-        if (!cputime_eq(prof_expires, cputime_zero) &&
-            (cputime_eq(sig->cputime_expires.prof_exp, cputime_zero) ||
-             cputime_gt(sig->cputime_expires.prof_exp, prof_expires)))
-                sig->cputime_expires.prof_exp = prof_expires;
-        if (!cputime_eq(virt_expires, cputime_zero) &&
-            (cputime_eq(sig->cputime_expires.virt_exp, cputime_zero) ||
-             cputime_gt(sig->cputime_expires.virt_exp, virt_expires)))
-                sig->cputime_expires.virt_exp = virt_expires;
-        if (sched_expires != 0 &&
-            (sig->cputime_expires.sched_exp == 0 ||
-             sig->cputime_expires.sched_exp > sched_expires))
-                sig->cputime_expires.sched_exp = sched_expires;
+        sig->cputime_expires.prof_exp = prof_expires;
+        sig->cputime_expires.virt_exp = virt_expires;
+        sig->cputime_expires.sched_exp = sched_expires;
+        if (task_cputime_zero(&sig->cputime_expires))
+                stop_process_timers(sig);
 }
 
 /*
@@ -1270,6 +1196,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
                         goto out;
                 }
                 read_lock(&tasklist_lock); /* arm_timer needs it.  */
+                spin_lock(&p->sighand->siglock);
         } else {
                 read_lock(&tasklist_lock);
                 if (unlikely(p->signal == NULL)) {
@@ -1290,6 +1217,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
                         clear_dead_task(timer, now);
                         goto out_unlock;
                 }
+                spin_lock(&p->sighand->siglock);
                 cpu_timer_sample_group(timer->it_clock, p, &now);
                 bump_cpu_timer(timer, now);
                 /* Leave the tasklist_lock locked for the call below.  */
@@ -1298,7 +1226,9 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
         /*
          * Now re-arm for the new expiry time.
          */
-        arm_timer(timer, now);
+        BUG_ON(!irqs_disabled());
+        arm_timer(timer);
+        spin_unlock(&p->sighand->siglock);
 
 out_unlock:
         read_unlock(&tasklist_lock);
@@ -1310,23 +1240,6 @@ out:
 }
 
 /**
- * task_cputime_zero - Check a task_cputime struct for all zero fields.
- *
- * @cputime:    The struct to compare.
- *
- * Checks @cputime to see if all fields are zero.  Returns true if all fields
- * are zero, false if any field is nonzero.
- */
-static inline int task_cputime_zero(const struct task_cputime *cputime)
-{
-        if (cputime_eq(cputime->utime, cputime_zero) &&
-            cputime_eq(cputime->stime, cputime_zero) &&
-            cputime->sum_exec_runtime == 0)
-                return 1;
-        return 0;
-}
-
-/**
  * task_cputime_expired - Compare two task_cputime entities.
  *
  * @sample:     The task_cputime structure to be checked for expiration.
@@ -1382,7 +1295,7 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
         }
 
         sig = tsk->signal;
-        if (!task_cputime_zero(&sig->cputime_expires)) {
+        if (sig->cputimer.running) {
                 struct task_cputime group_sample;
 
                 thread_group_cputimer(tsk, &group_sample);
@@ -1390,7 +1303,7 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
                         return 1;
         }
 
-        return sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY;
+        return 0;
 }
 
 /*
@@ -1419,7 +1332,12 @@ void run_posix_cpu_timers(struct task_struct *tsk)
          * put them on the firing list.
          */
         check_thread_timers(tsk, &firing);
-        check_process_timers(tsk, &firing);
+        /*
+         * If there are any active process wide timers (POSIX 1.b, itimers,
+         * RLIMIT_CPU) cputimer must be running.
+         */
+        if (tsk->signal->cputimer.running)
+                check_process_timers(tsk, &firing);
 
         /*
          * We must release these locks before taking any timer's lock.
@@ -1456,21 +1374,23 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 }
 
 /*
- * Set one of the process-wide special case CPU timers.
+ * Set one of the process-wide special case CPU timers or RLIMIT_CPU.
  * The tsk->sighand->siglock must be held by the caller.
- * The *newval argument is relative and we update it to be absolute, *oldval
- * is absolute and we update it to be relative.
  */
 void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
                            cputime_t *newval, cputime_t *oldval)
 {
         union cpu_time_count now;
-        struct list_head *head;
 
         BUG_ON(clock_idx == CPUCLOCK_SCHED);
         cpu_timer_sample_group(clock_idx, tsk, &now);
 
         if (oldval) {
+                /*
+                 * We are setting itimer. The *oldval is absolute and we update
+                 * it to be relative, *newval argument is relative and we update
+                 * it to be absolute.
+                 */
                 if (!cputime_eq(*oldval, cputime_zero)) {
                         if (cputime_le(*oldval, now.cpu)) {
                                 /* Just about to fire. */
@@ -1483,33 +1403,21 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
                 if (cputime_eq(*newval, cputime_zero))
                         return;
                 *newval = cputime_add(*newval, now.cpu);
-
-                /*
-                 * If the RLIMIT_CPU timer will expire before the
-                 * ITIMER_PROF timer, we have nothing else to do.
-                 */
-                if (tsk->signal->rlim[RLIMIT_CPU].rlim_cur
-                    < cputime_to_secs(*newval))
-                        return;
         }
 
         /*
-         * Check whether there are any process timers already set to fire
-         * before this one.  If so, we don't have anything more to do.
+         * Update expiration cache if we are the earliest timer, or eventually
+         * RLIMIT_CPU limit is earlier than prof_exp cpu timer expire.
          */
-        head = &tsk->signal->cpu_timers[clock_idx];
-        if (list_empty(head) ||
-            cputime_ge(list_first_entry(head,
-                                  struct cpu_timer_list, entry)->expires.cpu,
-                       *newval)) {
-                switch (clock_idx) {
-                case CPUCLOCK_PROF:
+        switch (clock_idx) {
+        case CPUCLOCK_PROF:
+                if (expires_gt(tsk->signal->cputime_expires.prof_exp, *newval))
                         tsk->signal->cputime_expires.prof_exp = *newval;
-                        break;
-                case CPUCLOCK_VIRT:
+                break;
+        case CPUCLOCK_VIRT:
+                if (expires_gt(tsk->signal->cputime_expires.virt_exp, *newval))
                         tsk->signal->cputime_expires.virt_exp = *newval;
-                        break;
-                }
+                break;
         }
 }
 
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 43191815f874..524e058dcf06 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -8,7 +8,8 @@ obj-$(CONFIG_PM_SLEEP)		+= console.o
 obj-$(CONFIG_FREEZER)           += process.o
 obj-$(CONFIG_SUSPEND)           += suspend.o
 obj-$(CONFIG_PM_TEST_SUSPEND)   += suspend_test.o
-obj-$(CONFIG_HIBERNATION)       += hibernate.o snapshot.o swap.o user.o
+obj-$(CONFIG_HIBERNATION)       += hibernate.o snapshot.o swap.o user.o \
+                                   block_io.o
 obj-$(CONFIG_HIBERNATION_NVS)   += hibernate_nvs.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)       += poweroff.o
diff --git a/kernel/power/block_io.c b/kernel/power/block_io.c
new file mode 100644
index 000000000000..97024fd40cd5
--- /dev/null
+++ b/kernel/power/block_io.c
@@ -0,0 +1,103 @@
+/*
+ * This file provides functions for block I/O operations on swap/file.
+ *
+ * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
+ * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/bio.h>
+#include <linux/kernel.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+
+#include "power.h"
+
+/**
+ *      submit - submit BIO request.
+ *      @rw:    READ or WRITE.
+ *      @off    physical offset of page.
+ *      @page:  page we're reading or writing.
+ *      @bio_chain: list of pending biod (for async reading)
+ *
+ *      Straight from the textbook - allocate and initialize the bio.
+ *      If we're reading, make sure the page is marked as dirty.
+ *      Then submit it and, if @bio_chain == NULL, wait.
+ */
+static int submit(int rw, struct block_device *bdev, sector_t sector,
+                struct page *page, struct bio **bio_chain)
+{
+        const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+        struct bio *bio;
+
+        bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
+        bio->bi_sector = sector;
+        bio->bi_bdev = bdev;
+        bio->bi_end_io = end_swap_bio_read;
+
+        if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+                printk(KERN_ERR "PM: Adding page to bio failed at %llu\n",
+                        (unsigned long long)sector);
+                bio_put(bio);
+                return -EFAULT;
+        }
+
+        lock_page(page);
+        bio_get(bio);
+
+        if (bio_chain == NULL) {
+                submit_bio(bio_rw, bio);
+                wait_on_page_locked(page);
+                if (rw == READ)
+                        bio_set_pages_dirty(bio);
+                bio_put(bio);
+        } else {
+                if (rw == READ)
+                        get_page(page); /* These pages are freed later */
+                bio->bi_private = *bio_chain;
+                *bio_chain = bio;
+                submit_bio(bio_rw, bio);
+        }
+        return 0;
+}
+
+int hib_bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
+{
+        return submit(READ, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
+                        virt_to_page(addr), bio_chain);
+}
+
+int hib_bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
+{
+        return submit(WRITE, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
+                        virt_to_page(addr), bio_chain);
+}
+
+int hib_wait_on_bio_chain(struct bio **bio_chain)
+{
+        struct bio *bio;
+        struct bio *next_bio;
+        int ret = 0;
+
+        if (bio_chain == NULL)
+                return 0;
+
+        bio = *bio_chain;
+        if (bio == NULL)
+                return 0;
+        while (bio) {
+                struct page *page;
+
+                next_bio = bio->bi_private;
+                page = bio->bi_io_vec[0].bv_page;
+                wait_on_page_locked(page);
+                if (!PageUptodate(page) || PageError(page))
+                        ret = -EIO;
+                put_page(page);
+                bio_put(bio);
+                bio = next_bio;
+        }
+        *bio_chain = NULL;
+        return ret;
+}
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 46c5a26630a3..006270fe382d 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -97,24 +97,12 @@ extern int hibernate_preallocate_memory(void);
  */
 
 struct snapshot_handle {
-        loff_t          offset; /* number of the last byte ready for reading
-                                 * or writing in the sequence
-                                 */
         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
                                  * next operation will refer to (ie. current)
                                  */
-        unsigned int    cur_offset;     /* offset with respect to the current
-                                         * block (for the next operation)
-                                         */
-        unsigned int    prev;   /* number of the block of PAGE_SIZE bytes that
-                                 * was the current one previously
-                                 */
         void            *buffer;        /* address of the block to read from
                                          * or write to
                                          */
-        unsigned int    buf_offset;     /* location to read from or write to,
-                                         * given as a displacement from 'buffer'
-                                         */
         int             sync_read;      /* Set to one to notify the caller of
                                          * snapshot_write_next() that it may
                                          * need to call wait_on_bio_chain()
@@ -125,12 +113,12 @@ struct snapshot_handle {
  * snapshot_read_next()/snapshot_write_next() is allowed to
  * read/write data after the function returns
  */
-#define data_of(handle) ((handle).buffer + (handle).buf_offset)
+#define data_of(handle) ((handle).buffer)
 
 extern unsigned int snapshot_additional_pages(struct zone *zone);
 extern unsigned long snapshot_get_image_size(void);
-extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
-extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
+extern int snapshot_read_next(struct snapshot_handle *handle);
+extern int snapshot_write_next(struct snapshot_handle *handle);
 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 
@@ -154,6 +142,15 @@ extern int swsusp_read(unsigned int *flags_p);
 extern int swsusp_write(unsigned int flags);
 extern void swsusp_close(fmode_t);
 
+/* kernel/power/block_io.c */
+extern struct block_device *hib_resume_bdev;
+
+extern int hib_bio_read_page(pgoff_t page_off, void *addr,
+                struct bio **bio_chain);
+extern int hib_bio_write_page(pgoff_t page_off, void *addr,
+                struct bio **bio_chain);
+extern int hib_wait_on_bio_chain(struct bio **bio_chain);
+
 struct timeval;
 /* kernel/power/swsusp.c */
 extern void swsusp_show_speed(struct timeval *, struct timeval *,
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index be861c26dda7..25ce010e9f8b 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1604,14 +1604,9 @@ pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
  *      snapshot_handle structure.  The structure gets updated and a pointer
  *      to it should be passed to this function every next time.
  *
- *      The @count parameter should contain the number of bytes the caller
- *      wants to read from the snapshot.  It must not be zero.
- *
  *      On success the function returns a positive number.  Then, the caller
  *      is allowed to read up to the returned number of bytes from the memory
- *      location computed by the data_of() macro.  The number returned
- *      may be smaller than @count, but this only happens if the read would
- *      cross a page boundary otherwise.
+ *      location computed by the data_of() macro.
  *
  *      The function returns 0 to indicate the end of data stream condition,
  *      and a negative number is returned on error.  In such cases the
@@ -1619,7 +1614,7 @@ pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
  *      any more.
  */
 
-int snapshot_read_next(struct snapshot_handle *handle, size_t count)
+int snapshot_read_next(struct snapshot_handle *handle)
 {
         if (handle->cur > nr_meta_pages + nr_copy_pages)
                 return 0;
@@ -1630,7 +1625,7 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
                 if (!buffer)
                         return -ENOMEM;
         }
-        if (!handle->offset) {
+        if (!handle->cur) {
                 int error;
 
                 error = init_header((struct swsusp_info *)buffer);
@@ -1639,42 +1634,30 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
                 handle->buffer = buffer;
                 memory_bm_position_reset(&orig_bm);
                 memory_bm_position_reset(&copy_bm);
-        }
-        if (handle->prev < handle->cur) {
-                if (handle->cur <= nr_meta_pages) {
-                        memset(buffer, 0, PAGE_SIZE);
-                        pack_pfns(buffer, &orig_bm);
-                } else {
-                        struct page *page;
+        } else if (handle->cur <= nr_meta_pages) {
+                memset(buffer, 0, PAGE_SIZE);
+                pack_pfns(buffer, &orig_bm);
+        } else {
+                struct page *page;
 
-                        page = pfn_to_page(memory_bm_next_pfn(&copy_bm));
-                        if (PageHighMem(page)) {
-                                /* Highmem pages are copied to the buffer,
-                                 * because we can't return with a kmapped
-                                 * highmem page (we may not be called again).
-                                 */
-                                void *kaddr;
+                page = pfn_to_page(memory_bm_next_pfn(&copy_bm));
+                if (PageHighMem(page)) {
+                        /* Highmem pages are copied to the buffer,
+                         * because we can't return with a kmapped
+                         * highmem page (we may not be called again).
+                         */
+                        void *kaddr;
 
-                                kaddr = kmap_atomic(page, KM_USER0);
-                                memcpy(buffer, kaddr, PAGE_SIZE);
-                                kunmap_atomic(kaddr, KM_USER0);
-                                handle->buffer = buffer;
-                        } else {
-                                handle->buffer = page_address(page);
-                        }
+                        kaddr = kmap_atomic(page, KM_USER0);
+                        memcpy(buffer, kaddr, PAGE_SIZE);
+                        kunmap_atomic(kaddr, KM_USER0);
+                        handle->buffer = buffer;
+                } else {
+                        handle->buffer = page_address(page);
                 }
-                handle->prev = handle->cur;
-        }
-        handle->buf_offset = handle->cur_offset;
-        if (handle->cur_offset + count >= PAGE_SIZE) {
-                count = PAGE_SIZE - handle->cur_offset;
-                handle->cur_offset = 0;
-                handle->cur++;
-        } else {
-                handle->cur_offset += count;
         }
-        handle->offset += count;
-        return count;
+        handle->cur++;
+        return PAGE_SIZE;
 }
 
 /**
@@ -2133,14 +2116,9 @@ static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
  *      snapshot_handle structure.  The structure gets updated and a pointer
  *      to it should be passed to this function every next time.
  *
- *      The @count parameter should contain the number of bytes the caller
- *      wants to write to the image.  It must not be zero.
- *
  *      On success the function returns a positive number.  Then, the caller
  *      is allowed to write up to the returned number of bytes to the memory
- *      location computed by the data_of() macro.  The number returned
- *      may be smaller than @count, but this only happens if the write would
- *      cross a page boundary otherwise.
+ *      location computed by the data_of() macro.
  *
  *      The function returns 0 to indicate the "end of file" condition,
  *      and a negative number is returned on error.  In such cases the
@@ -2148,16 +2126,18 @@ static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
  *      any more.
  */
 
-int snapshot_write_next(struct snapshot_handle *handle, size_t count)
+int snapshot_write_next(struct snapshot_handle *handle)
 {
         static struct chain_allocator ca;
         int error = 0;
 
         /* Check if we have already loaded the entire image */
-        if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages)
+        if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages)
                 return 0;
 
-        if (handle->offset == 0) {
+        handle->sync_read = 1;
+
+        if (!handle->cur) {
                 if (!buffer)
                         /* This makes the buffer be freed by swsusp_free() */
                         buffer = get_image_page(GFP_ATOMIC, PG_ANY);
@@ -2166,56 +2146,43 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
                         return -ENOMEM;
 
                 handle->buffer = buffer;
-        }
-        handle->sync_read = 1;
-        if (handle->prev < handle->cur) {
-                if (handle->prev == 0) {
-                        error = load_header(buffer);
-                        if (error)
-                                return error;
+        } else if (handle->cur == 1) {
+                error = load_header(buffer);
+                if (error)
+                        return error;
 
-                        error = memory_bm_create(&copy_bm, GFP_ATOMIC, PG_ANY);
-                        if (error)
-                                return error;
+                error = memory_bm_create(&copy_bm, GFP_ATOMIC, PG_ANY);
+                if (error)
+                        return error;
+
+        } else if (handle->cur <= nr_meta_pages + 1) {
+                error = unpack_orig_pfns(buffer, &copy_bm);
+                if (error)
+                        return error;
 
-                } else if (handle->prev <= nr_meta_pages) {
-                        error = unpack_orig_pfns(buffer, &copy_bm);
+                if (handle->cur == nr_meta_pages + 1) {
+                        error = prepare_image(&orig_bm, &copy_bm);
                         if (error)
                                 return error;
 
-                        if (handle->prev == nr_meta_pages) {
-                                error = prepare_image(&orig_bm, &copy_bm);
-                                if (error)
-                                        return error;
-
-                                chain_init(&ca, GFP_ATOMIC, PG_SAFE);
-                                memory_bm_position_reset(&orig_bm);
-                                restore_pblist = NULL;
-                                handle->buffer = get_buffer(&orig_bm, &ca);
-                                handle->sync_read = 0;
-                                if (IS_ERR(handle->buffer))
-                                        return PTR_ERR(handle->buffer);
-                        }
-                } else {
-                        copy_last_highmem_page();
+                        chain_init(&ca, GFP_ATOMIC, PG_SAFE);
+                        memory_bm_position_reset(&orig_bm);
+                        restore_pblist = NULL;
                         handle->buffer = get_buffer(&orig_bm, &ca);
+                        handle->sync_read = 0;
                         if (IS_ERR(handle->buffer))
                                 return PTR_ERR(handle->buffer);
-                        if (handle->buffer != buffer)
-                                handle->sync_read = 0;
                 }
-                handle->prev = handle->cur;
-        }
-        handle->buf_offset = handle->cur_offset;
-        if (handle->cur_offset + count >= PAGE_SIZE) {
-                count = PAGE_SIZE - handle->cur_offset;
-                handle->cur_offset = 0;
-                handle->cur++;
         } else {
-                handle->cur_offset += count;
+                copy_last_highmem_page();
+                handle->buffer = get_buffer(&orig_bm, &ca);
+                if (IS_ERR(handle->buffer))
+                        return PTR_ERR(handle->buffer);
+                if (handle->buffer != buffer)
+                        handle->sync_read = 0;
         }
-        handle->offset += count;
-        return count;
+        handle->cur++;
+        return PAGE_SIZE;
 }
 
 /**
@@ -2230,7 +2197,7 @@ void snapshot_write_finalize(struct snapshot_handle *handle)
 {
         copy_last_highmem_page();
         /* Free only if we have loaded the image entirely */
-        if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages) {
+        if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) {
                 memory_bm_free(&orig_bm, PG_UNSAFE_CLEAR);
                 free_highmem_data();
         }
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 66824d71983a..b0bb21778391 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -29,6 +29,40 @@
 
 #define SWSUSP_SIG      "S1SUSPEND"
 
+/*
+ *      The swap map is a data structure used for keeping track of each page
+ *      written to a swap partition.  It consists of many swap_map_page
+ *      structures that contain each an array of MAP_PAGE_SIZE swap entries.
+ *      These structures are stored on the swap and linked together with the
+ *      help of the .next_swap member.
+ *
+ *      The swap map is created during suspend.  The swap map pages are
+ *      allocated and populated one at a time, so we only need one memory
+ *      page to set up the entire structure.
+ *
+ *      During resume we also only need to use one swap_map_page structure
+ *      at a time.
+ */
+
+#define MAP_PAGE_ENTRIES        (PAGE_SIZE / sizeof(sector_t) - 1)
+
+struct swap_map_page {
+        sector_t entries[MAP_PAGE_ENTRIES];
+        sector_t next_swap;
+};
+
+/**
+ *      The swap_map_handle structure is used for handling swap in
+ *      a file-alike way
+ */
+
+struct swap_map_handle {
+        struct swap_map_page *cur;
+        sector_t cur_swap;
+        sector_t first_sector;
+        unsigned int k;
+};
+
 struct swsusp_header {
         char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)];
         sector_t image;
@@ -145,110 +179,24 @@ int swsusp_swap_in_use(void)
  */
 
 static unsigned short root_swap = 0xffff;
-static struct block_device *resume_bdev;
-
-/**
- *      submit - submit BIO request.
- *      @rw:    READ or WRITE.
- *      @off    physical offset of page.
- *      @page:  page we're reading or writing.
- *      @bio_chain: list of pending biod (for async reading)
- *
- *      Straight from the textbook - allocate and initialize the bio.
- *      If we're reading, make sure the page is marked as dirty.
- *      Then submit it and, if @bio_chain == NULL, wait.
- */
-static int submit(int rw, pgoff_t page_off, struct page *page,
-                        struct bio **bio_chain)
-{
-        const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
-        struct bio *bio;
-
-        bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
-        bio->bi_sector = page_off * (PAGE_SIZE >> 9);
-        bio->bi_bdev = resume_bdev;
-        bio->bi_end_io = end_swap_bio_read;
-
-        if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
-                printk(KERN_ERR "PM: Adding page to bio failed at %ld\n",
-                        page_off);
-                bio_put(bio);
-                return -EFAULT;
-        }
-
-        lock_page(page);
-        bio_get(bio);
-
-        if (bio_chain == NULL) {
-                submit_bio(bio_rw, bio);
-                wait_on_page_locked(page);
-                if (rw == READ)
-                        bio_set_pages_dirty(bio);
-                bio_put(bio);
-        } else {
-                if (rw == READ)
-                        get_page(page); /* These pages are freed later */
-                bio->bi_private = *bio_chain;
-                *bio_chain = bio;
-                submit_bio(bio_rw, bio);
-        }
-        return 0;
-}
-
-static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
-{
-        return submit(READ, page_off, virt_to_page(addr), bio_chain);
-}
-
-static int bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
-{
-        return submit(WRITE, page_off, virt_to_page(addr), bio_chain);
-}
-
-static int wait_on_bio_chain(struct bio **bio_chain)
-{
-        struct bio *bio;
-        struct bio *next_bio;
-        int ret = 0;
-
-        if (bio_chain == NULL)
-                return 0;
-
-        bio = *bio_chain;
-        if (bio == NULL)
-                return 0;
-        while (bio) {
-                struct page *page;
-
-                next_bio = bio->bi_private;
-                page = bio->bi_io_vec[0].bv_page;
-                wait_on_page_locked(page);
-                if (!PageUptodate(page) || PageError(page))
-                        ret = -EIO;
-                put_page(page);
-                bio_put(bio);
-                bio = next_bio;
-        }
-        *bio_chain = NULL;
-        return ret;
-}
+struct block_device *hib_resume_bdev;
 
 /*
  * Saving part
  */
 
-static int mark_swapfiles(sector_t start, unsigned int flags)
+static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
 {
         int error;
 
-        bio_read_page(swsusp_resume_block, swsusp_header, NULL);
+        hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
         if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
             !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
                 memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
                 memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
-                swsusp_header->image = start;
+                swsusp_header->image = handle->first_sector;
                 swsusp_header->flags = flags;
-                error = bio_write_page(swsusp_resume_block,
+                error = hib_bio_write_page(swsusp_resume_block,
                                         swsusp_header, NULL);
         } else {
                 printk(KERN_ERR "PM: Swap header not found!\n");
@@ -260,25 +208,26 @@ static int mark_swapfiles(sector_t start, unsigned int flags)
 /**
  *      swsusp_swap_check - check if the resume device is a swap device
  *      and get its index (if so)
+ *
+ *      This is called before saving image
  */
-
-static int swsusp_swap_check(void) /* This is called before saving image */
+static int swsusp_swap_check(void)
 {
         int res;
 
         res = swap_type_of(swsusp_resume_device, swsusp_resume_block,
-                        &resume_bdev);
+                        &hib_resume_bdev);
         if (res < 0)
                 return res;
 
         root_swap = res;
-        res = blkdev_get(resume_bdev, FMODE_WRITE);
+        res = blkdev_get(hib_resume_bdev, FMODE_WRITE);
         if (res)
                 return res;
 
-        res = set_blocksize(resume_bdev, PAGE_SIZE);
+        res = set_blocksize(hib_resume_bdev, PAGE_SIZE);
         if (res < 0)
-                blkdev_put(resume_bdev, FMODE_WRITE);
+                blkdev_put(hib_resume_bdev, FMODE_WRITE);
 
         return res;
 }
@@ -309,42 +258,9 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
         } else {
                 src = buf;
         }
-        return bio_write_page(offset, src, bio_chain);
+        return hib_bio_write_page(offset, src, bio_chain);
 }
 
-/*
- *      The swap map is a data structure used for keeping track of each page
- *      written to a swap partition.  It consists of many swap_map_page
- *      structures that contain each an array of MAP_PAGE_SIZE swap entries.
- *      These structures are stored on the swap and linked together with the
- *      help of the .next_swap member.
- *
- *      The swap map is created during suspend.  The swap map pages are
- *      allocated and populated one at a time, so we only need one memory
- *      page to set up the entire structure.
- *
- *      During resume we also only need to use one swap_map_page structure
- *      at a time.
- */
-
-#define MAP_PAGE_ENTRIES        (PAGE_SIZE / sizeof(sector_t) - 1)
-
-struct swap_map_page {
-        sector_t entries[MAP_PAGE_ENTRIES];
-        sector_t next_swap;
-};
-
-/**
- *      The swap_map_handle structure is used for handling swap in
- *      a file-alike way
- */
-
-struct swap_map_handle {
-        struct swap_map_page *cur;
-        sector_t cur_swap;
-        unsigned int k;
-};
-
 static void release_swap_writer(struct swap_map_handle *handle)
 {
         if (handle->cur)
@@ -354,16 +270,33 @@ static void release_swap_writer(struct swap_map_handle *handle)
 
 static int get_swap_writer(struct swap_map_handle *handle)
 {
+        int ret;
+
+        ret = swsusp_swap_check();
+        if (ret) {
+                if (ret != -ENOSPC)
+                        printk(KERN_ERR "PM: Cannot find swap device, try "
+                                        "swapon -a.\n");
+                return ret;
+        }
         handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
-        if (!handle->cur)
-                return -ENOMEM;
+        if (!handle->cur) {
+                ret = -ENOMEM;
+                goto err_close;
+        }
         handle->cur_swap = alloc_swapdev_block(root_swap);
         if (!handle->cur_swap) {
-                release_swap_writer(handle);
-                return -ENOSPC;
+                ret = -ENOSPC;
+                goto err_rel;
         }
         handle->k = 0;
+        handle->first_sector = handle->cur_swap;
         return 0;
+err_rel:
+        release_swap_writer(handle);
+err_close:
+        swsusp_close(FMODE_WRITE);
+        return ret;
 }
 
 static int swap_write_page(struct swap_map_handle *handle, void *buf,
@@ -380,7 +313,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
                 return error;
         handle->cur->entries[handle->k++] = offset;
         if (handle->k >= MAP_PAGE_ENTRIES) {
-                error = wait_on_bio_chain(bio_chain);
+                error = hib_wait_on_bio_chain(bio_chain);
                 if (error)
                         goto out;
                 offset = alloc_swapdev_block(root_swap);
@@ -406,6 +339,24 @@ static int flush_swap_writer(struct swap_map_handle *handle)
                 return -EINVAL;
 }
 
+static int swap_writer_finish(struct swap_map_handle *handle,
+                unsigned int flags, int error)
+{
+        if (!error) {
+                flush_swap_writer(handle);
+                printk(KERN_INFO "PM: S");
+                error = mark_swapfiles(handle, flags);
+                printk("|\n");
+        }
+
+        if (error)
+                free_all_swap_pages(root_swap);
+        release_swap_writer(handle);
+        swsusp_close(FMODE_WRITE);
+
+        return error;
+}
+
 /**
  *      save_image - save the suspend image data
  */
@@ -431,7 +382,7 @@ static int save_image(struct swap_map_handle *handle,
         bio = NULL;
         do_gettimeofday(&start);
         while (1) {
-                ret = snapshot_read_next(snapshot, PAGE_SIZE);
+                ret = snapshot_read_next(snapshot);
                 if (ret <= 0)
                         break;
                 ret = swap_write_page(handle, data_of(*snapshot), &bio);
@@ -441,7 +392,7 @@ static int save_image(struct swap_map_handle *handle,
                         printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
                 nr_pages++;
         }
-        err2 = wait_on_bio_chain(&bio);
+        err2 = hib_wait_on_bio_chain(&bio);
         do_gettimeofday(&stop);
         if (!ret)
                 ret = err2;
@@ -483,50 +434,34 @@ int swsusp_write(unsigned int flags)
         struct swap_map_handle handle;
         struct snapshot_handle snapshot;
         struct swsusp_info *header;
+        unsigned long pages;
         int error;
 
-        error = swsusp_swap_check();
+        pages = snapshot_get_image_size();
+        error = get_swap_writer(&handle);
         if (error) {
-                printk(KERN_ERR "PM: Cannot find swap device, try "
-                                "swapon -a.\n");
+                printk(KERN_ERR "PM: Cannot get swap writer\n");
                 return error;
         }
+        if (!enough_swap(pages)) {
+                printk(KERN_ERR "PM: Not enough free swap\n");
+                error = -ENOSPC;
+                goto out_finish;
+        }
         memset(&snapshot, 0, sizeof(struct snapshot_handle));
-        error = snapshot_read_next(&snapshot, PAGE_SIZE);
+        error = snapshot_read_next(&snapshot);
         if (error < PAGE_SIZE) {
                 if (error >= 0)
                         error = -EFAULT;
 
-                goto out;
+                goto out_finish;
         }
         header = (struct swsusp_info *)data_of(snapshot);
-        if (!enough_swap(header->pages)) {
-                printk(KERN_ERR "PM: Not enough free swap\n");
-                error = -ENOSPC;
-                goto out;
-        }
-        error = get_swap_writer(&handle);
-        if (!error) {
-                sector_t start = handle.cur_swap;
-
-                error = swap_write_page(&handle, header, NULL);
-                if (!error)
-                        error = save_image(&handle, &snapshot,
-                                        header->pages - 1);
-
-                if (!error) {
-                        flush_swap_writer(&handle);
-                        printk(KERN_INFO "PM: S");
-                        error = mark_swapfiles(start, flags);
-                        printk("|\n");
-                }
-        }
-        if (error)
-                free_all_swap_pages(root_swap);
-
-        release_swap_writer(&handle);
- out:
-        swsusp_close(FMODE_WRITE);
+        error = swap_write_page(&handle, header, NULL);
+        if (!error)
+                error = save_image(&handle, &snapshot, pages - 1);
+out_finish:
+        error = swap_writer_finish(&handle, flags, error);
         return error;
 }
 
@@ -542,18 +477,21 @@ static void release_swap_reader(struct swap_map_handle *handle)
         handle->cur = NULL;
 }
 
-static int get_swap_reader(struct swap_map_handle *handle, sector_t start)
+static int get_swap_reader(struct swap_map_handle *handle,
+                unsigned int *flags_p)
 {
         int error;
 
-        if (!start)
+        *flags_p = swsusp_header->flags;
+
+        if (!swsusp_header->image) /* how can this happen? */
                 return -EINVAL;
 
         handle->cur = (struct swap_map_page *)get_zeroed_page(__GFP_WAIT | __GFP_HIGH);
         if (!handle->cur)
                 return -ENOMEM;
 
-        error = bio_read_page(start, handle->cur, NULL);
+        error = hib_bio_read_page(swsusp_header->image, handle->cur, NULL);
         if (error) {
                 release_swap_reader(handle);
                 return error;
@@ -573,21 +511,28 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
         offset = handle->cur->entries[handle->k];
         if (!offset)
                 return -EFAULT;
-        error = bio_read_page(offset, buf, bio_chain);
+        error = hib_bio_read_page(offset, buf, bio_chain);
         if (error)
                 return error;
         if (++handle->k >= MAP_PAGE_ENTRIES) {
-                error = wait_on_bio_chain(bio_chain);
+                error = hib_wait_on_bio_chain(bio_chain);
                 handle->k = 0;
                 offset = handle->cur->next_swap;
                 if (!offset)
                         release_swap_reader(handle);
                 else if (!error)
-                        error = bio_read_page(offset, handle->cur, NULL);
+                        error = hib_bio_read_page(offset, handle->cur, NULL);
         }
         return error;
 }
 
+static int swap_reader_finish(struct swap_map_handle *handle)
+{
+        release_swap_reader(handle);
+
+        return 0;
+}
+
 /**
  *      load_image - load the image using the swap map handle
  *      @handle and the snapshot handle @snapshot
@@ -615,21 +560,21 @@ static int load_image(struct swap_map_handle *handle,
         bio = NULL;
         do_gettimeofday(&start);
         for ( ; ; ) {
-                error = snapshot_write_next(snapshot, PAGE_SIZE);
+                error = snapshot_write_next(snapshot);
                 if (error <= 0)
                         break;
                 error = swap_read_page(handle, data_of(*snapshot), &bio);
                 if (error)
                         break;
                 if (snapshot->sync_read)
-                        error = wait_on_bio_chain(&bio);
+                        error = hib_wait_on_bio_chain(&bio);
                 if (error)
                         break;
                 if (!(nr_pages % m))
                         printk("\b\b\b\b%3d%%", nr_pages / m);
                 nr_pages++;
         }
-        err2 = wait_on_bio_chain(&bio);
+        err2 = hib_wait_on_bio_chain(&bio);
         do_gettimeofday(&stop);
         if (!error)
                 error = err2;
@@ -657,20 +602,20 @@ int swsusp_read(unsigned int *flags_p)
         struct snapshot_handle snapshot;
         struct swsusp_info *header;
 
-        *flags_p = swsusp_header->flags;
-
         memset(&snapshot, 0, sizeof(struct snapshot_handle));
-        error = snapshot_write_next(&snapshot, PAGE_SIZE);
+        error = snapshot_write_next(&snapshot);
         if (error < PAGE_SIZE)
                 return error < 0 ? error : -EFAULT;
         header = (struct swsusp_info *)data_of(snapshot);
-        error = get_swap_reader(&handle, swsusp_header->image);
+        error = get_swap_reader(&handle, flags_p);
+        if (error)
+                goto end;
         if (!error)
                 error = swap_read_page(&handle, header, NULL);
         if (!error)
                 error = load_image(&handle, &snapshot, header->pages - 1);
-        release_swap_reader(&handle);
-
+        swap_reader_finish(&handle);
+end:
         if (!error)
                 pr_debug("PM: Image successfully loaded\n");
         else
@@ -686,11 +631,11 @@ int swsusp_check(void)
 {
         int error;
 
-        resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
-        if (!IS_ERR(resume_bdev)) {
-                set_blocksize(resume_bdev, PAGE_SIZE);
+        hib_resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
+        if (!IS_ERR(hib_resume_bdev)) {
+                set_blocksize(hib_resume_bdev, PAGE_SIZE);
                 memset(swsusp_header, 0, PAGE_SIZE);
-                error = bio_read_page(swsusp_resume_block,
+                error = hib_bio_read_page(swsusp_resume_block,
                                         swsusp_header, NULL);
                 if (error)
                         goto put;
@@ -698,7 +643,7 @@ int swsusp_check(void)
                 if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) {
                         memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
                         /* Reset swap signature now */
-                        error = bio_write_page(swsusp_resume_block,
+                        error = hib_bio_write_page(swsusp_resume_block,
                                                 swsusp_header, NULL);
                 } else {
                         error = -EINVAL;
@@ -706,11 +651,11 @@ int swsusp_check(void)
 
 put:
                 if (error)
-                        blkdev_put(resume_bdev, FMODE_READ);
+                        blkdev_put(hib_resume_bdev, FMODE_READ);
                 else
                         pr_debug("PM: Signature found, resuming\n");
         } else {
-                error = PTR_ERR(resume_bdev);
+                error = PTR_ERR(hib_resume_bdev);
         }
 
         if (error)
@@ -725,12 +670,12 @@ put:
 
 void swsusp_close(fmode_t mode)
 {
-        if (IS_ERR(resume_bdev)) {
+        if (IS_ERR(hib_resume_bdev)) {
                 pr_debug("PM: Image device not initialised\n");
                 return;
         }
 
-        blkdev_put(resume_bdev, mode);
+        blkdev_put(hib_resume_bdev, mode);
 }
 
 static int swsusp_header_init(void)
diff --git a/kernel/power/user.c b/kernel/power/user.c
index a8c96212bc1b..e819e17877ca 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -151,6 +151,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
 {
         struct snapshot_data *data;
         ssize_t res;
+        loff_t pg_offp = *offp & ~PAGE_MASK;
 
         mutex_lock(&pm_mutex);
 
@@ -159,14 +160,19 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
                 res = -ENODATA;
                 goto Unlock;
         }
-        res = snapshot_read_next(&data->handle, count);
-        if (res > 0) {
-                if (copy_to_user(buf, data_of(data->handle), res))
-                        res = -EFAULT;
-                else
-                        *offp = data->handle.offset;
+        if (!pg_offp) { /* on page boundary? */
+                res = snapshot_read_next(&data->handle);
+                if (res <= 0)
+                        goto Unlock;
+        } else {
+                res = PAGE_SIZE - pg_offp;
         }
 
+        res = simple_read_from_buffer(buf, count, &pg_offp,
+                        data_of(data->handle), res);
+        if (res > 0)
+                *offp += res;
+
  Unlock:
         mutex_unlock(&pm_mutex);
 
@@ -178,18 +184,25 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
 {
         struct snapshot_data *data;
         ssize_t res;
+        loff_t pg_offp = *offp & ~PAGE_MASK;
 
         mutex_lock(&pm_mutex);
 
         data = filp->private_data;
-        res = snapshot_write_next(&data->handle, count);
-        if (res > 0) {
-                if (copy_from_user(data_of(data->handle), buf, res))
-                        res = -EFAULT;
-                else
-                        *offp = data->handle.offset;
+
+        if (!pg_offp) {
+                res = snapshot_write_next(&data->handle);
+                if (res <= 0)
+                        goto unlock;
+        } else {
+                res = PAGE_SIZE - pg_offp;
         }
 
+        res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
+                        buf, count);
+        if (res > 0)
+                *offp += res;
+unlock:
         mutex_unlock(&pm_mutex);
 
         return res;
diff --git a/kernel/printk.c b/kernel/printk.c
index 75077ad0b537..444b770c9595 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -33,6 +33,7 @@
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
 #include <linux/kexec.h>
+#include <linux/kdb.h>
 #include <linux/ratelimit.h>
 #include <linux/kmsg_dump.h>
 #include <linux/syslog.h>
@@ -413,6 +414,22 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
         return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
 }
 
+#ifdef  CONFIG_KGDB_KDB
+/* kdb dmesg command needs access to the syslog buffer.  do_syslog()
+ * uses locks so it cannot be used during debugging.  Just tell kdb
+ * where the start and end of the physical and logical logs are.  This
+ * is equivalent to do_syslog(3).
+ */
+void kdb_syslog_data(char *syslog_data[4])
+{
+        syslog_data[0] = log_buf;
+        syslog_data[1] = log_buf + log_buf_len;
+        syslog_data[2] = log_buf + log_end -
+                (logged_chars < log_buf_len ? logged_chars : log_buf_len);
+        syslog_data[3] = log_buf + log_end;
+}
+#endif  /* CONFIG_KGDB_KDB */
+
 /*
  * Call the console drivers on a range of log_buf
  */
@@ -586,6 +603,14 @@ asmlinkage int printk(const char *fmt, ...)
         va_list args;
         int r;
 
+#ifdef CONFIG_KGDB_KDB
+        if (unlikely(kdb_trap_printk)) {
+                va_start(args, fmt);
+                r = vkdb_printf(fmt, args);
+                va_end(args);
+                return r;
+        }
+#endif
         va_start(args, fmt);
         r = vprintk(fmt, args);
         va_end(args);
diff --git a/kernel/relay.c b/kernel/relay.c
index 3d97f2821611..4268287148c1 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1231,8 +1231,8 @@ static ssize_t subbuf_splice_actor(struct file *in,
         size_t read_subbuf = read_start / subbuf_size;
         size_t padding = rbuf->padding[read_subbuf];
         size_t nonpad_end = read_subbuf * subbuf_size + subbuf_size - padding;
-        struct page *pages[PIPE_BUFFERS];
-        struct partial_page partial[PIPE_BUFFERS];
+        struct page *pages[PIPE_DEF_BUFFERS];
+        struct partial_page partial[PIPE_DEF_BUFFERS];
         struct splice_pipe_desc spd = {
                 .pages = pages,
                 .nr_pages = 0,
@@ -1245,6 +1245,8 @@ static ssize_t subbuf_splice_actor(struct file *in,
 
         if (rbuf->subbufs_produced == rbuf->subbufs_consumed)
                 return 0;
+        if (splice_grow_spd(pipe, &spd))
+                return -ENOMEM;
 
         /*
          * Adjust read len, if longer than what is available
@@ -1255,7 +1257,7 @@ static ssize_t subbuf_splice_actor(struct file *in,
         subbuf_pages = rbuf->chan->alloc_size >> PAGE_SHIFT;
         pidx = (read_start / PAGE_SIZE) % subbuf_pages;
         poff = read_start & ~PAGE_MASK;
-        nr_pages = min_t(unsigned int, subbuf_pages, PIPE_BUFFERS);
+        nr_pages = min_t(unsigned int, subbuf_pages, pipe->buffers);
 
         for (total_len = 0; spd.nr_pages < nr_pages; spd.nr_pages++) {
                 unsigned int this_len, this_end, private;
@@ -1289,16 +1291,19 @@ static ssize_t subbuf_splice_actor(struct file *in,
                 }
         }
 
+        ret = 0;
         if (!spd.nr_pages)
-                return 0;
+                goto out;
 
         ret = *nonpad_ret = splice_to_pipe(pipe, &spd);
         if (ret < 0 || ret < total_len)
-                return ret;
+                goto out;
 
         if (read_start + ret == nonpad_end)
                 ret += padding;
 
+out:
+        splice_shrink_spd(pipe, &spd);
         return ret;
 }
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 1d93cd0ae4d3..054a6012de99 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3851,6 +3851,7 @@ void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
 {
         __wake_up_common(q, mode, 1, 0, NULL);
 }
+EXPORT_SYMBOL_GPL(__wake_up_locked);
 
 void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key)
 {
@@ -7758,9 +7759,9 @@ void normalize_rt_tasks(void)
 
 #endif /* CONFIG_MAGIC_SYSRQ */
 
-#ifdef CONFIG_IA64
+#if defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB)
 /*
- * These functions are only useful for the IA64 MCA handling.
+ * These functions are only useful for the IA64 MCA handling, or kdb.
  *
  * They can only be called when the whole system has been
  * stopped - every CPU needs to be quiescent, and no scheduling
@@ -7780,6 +7781,9 @@ struct task_struct *curr_task(int cpu)
         return cpu_curr(cpu);
 }
 
+#endif /* defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB) */
+
+#ifdef CONFIG_IA64
 /**
  * set_curr_task - set the current task for a given cpu.
  * @cpu: the processor in question.
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 5b496132c28a..906a0f718cb3 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -41,6 +41,7 @@ unsigned long long __attribute__((weak)) sched_clock(void)
         return (unsigned long long)(jiffies - INITIAL_JIFFIES)
                                         * (NSEC_PER_SEC / HZ);
 }
+EXPORT_SYMBOL_GPL(sched_clock);
 
 static __read_mostly int sched_clock_running;
 
diff --git a/kernel/signal.c b/kernel/signal.c
index dbd7fe073c55..825a3f24ad76 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2735,3 +2735,43 @@ void __init signals_init(void)
 {
         sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
 }
+
+#ifdef CONFIG_KGDB_KDB
+#include <linux/kdb.h>
+/*
+ * kdb_send_sig_info - Allows kdb to send signals without exposing
+ * signal internals.  This function checks if the required locks are
+ * available before calling the main signal code, to avoid kdb
+ * deadlocks.
+ */
+void
+kdb_send_sig_info(struct task_struct *t, struct siginfo *info)
+{
+        static struct task_struct *kdb_prev_t;
+        int sig, new_t;
+        if (!spin_trylock(&t->sighand->siglock)) {
+                kdb_printf("Can't do kill command now.\n"
+                           "The sigmask lock is held somewhere else in "
+                           "kernel, try again later\n");
+                return;
+        }
+        spin_unlock(&t->sighand->siglock);
+        new_t = kdb_prev_t != t;
+        kdb_prev_t = t;
+        if (t->state != TASK_RUNNING && new_t) {
+                kdb_printf("Process is not RUNNING, sending a signal from "
+                           "kdb risks deadlock\n"
+                           "on the run queue locks. "
+                           "The signal has _not_ been sent.\n"
+                           "Reissue the kill command if you want to risk "
+                           "the deadlock.\n");
+                return;
+        }
+        sig = info->si_signo;
+        if (send_sig_info(sig, info, t))
+                kdb_printf("Fail to deliver Signal %d to process %d.\n",
+                           sig, t->pid);
+        else
+                kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
+}
+#endif  /* CONFIG_KGDB_KDB */
diff --git a/kernel/sys.c b/kernel/sys.c
index 7cb426a58965..0d36d889c74d 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -492,10 +492,6 @@ SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
                 return -ENOMEM;
         old = current_cred();
 
-        retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE);
-        if (retval)
-                goto error;
-
         retval = -EPERM;
         if (rgid != (gid_t) -1) {
                 if (old->gid == rgid ||
@@ -543,10 +539,6 @@ SYSCALL_DEFINE1(setgid, gid_t, gid)
                 return -ENOMEM;
         old = current_cred();
 
-        retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID);
-        if (retval)
-                goto error;
-
         retval = -EPERM;
         if (capable(CAP_SETGID))
                 new->gid = new->egid = new->sgid = new->fsgid = gid;
@@ -610,10 +602,6 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
                 return -ENOMEM;
         old = current_cred();
 
-        retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE);
-        if (retval)
-                goto error;
-
         retval = -EPERM;
         if (ruid != (uid_t) -1) {
                 new->uid = ruid;
@@ -675,10 +663,6 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
                 return -ENOMEM;
         old = current_cred();
 
-        retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID);
-        if (retval)
-                goto error;
-
         retval = -EPERM;
         if (capable(CAP_SETUID)) {
                 new->suid = new->uid = uid;
@@ -719,9 +703,6 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
         if (!new)
                 return -ENOMEM;
 
-        retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES);
-        if (retval)
-                goto error;
         old = current_cred();
 
         retval = -EPERM;
@@ -788,10 +769,6 @@ SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
                 return -ENOMEM;
         old = current_cred();
 
-        retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES);
-        if (retval)
-                goto error;
-
         retval = -EPERM;
         if (!capable(CAP_SETGID)) {
                 if (rgid != (gid_t) -1 && rgid != old->gid &&
@@ -851,9 +828,6 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
         old = current_cred();
         old_fsuid = old->fsuid;
 
-        if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0)
-                goto error;
-
         if (uid == old->uid  || uid == old->euid  ||
             uid == old->suid || uid == old->fsuid ||
             capable(CAP_SETUID)) {
@@ -864,7 +838,6 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
                 }
         }
 
-error:
         abort_creds(new);
         return old_fsuid;
 
@@ -888,9 +861,6 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
         old = current_cred();
         old_fsgid = old->fsgid;
 
-        if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS))
-                goto error;
-
         if (gid == old->gid  || gid == old->egid  ||
             gid == old->sgid || gid == old->fsgid ||
             capable(CAP_SETGID)) {
@@ -900,7 +870,6 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
                 }
         }
 
-error:
         abort_creds(new);
         return old_fsgid;
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8686b0f5fc12..4c93486b45d1 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -52,6 +52,7 @@
 #include <linux/slow-work.h>
 #include <linux/perf_event.h>
 #include <linux/kprobes.h>
+#include <linux/pipe_fs_i.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -163,6 +164,27 @@ static int proc_taint(struct ctl_table *table, int write,
                                void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
+#ifdef CONFIG_MAGIC_SYSRQ
+static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
+
+static int sysrq_sysctl_handler(ctl_table *table, int write,
+                                void __user *buffer, size_t *lenp,
+                                loff_t *ppos)
+{
+        int error;
+
+        error = proc_dointvec(table, write, buffer, lenp, ppos);
+        if (error)
+                return error;
+
+        if (write)
+                sysrq_toggle_support(__sysrq_enabled);
+
+        return 0;
+}
+
+#endif
+
 static struct ctl_table root_table[];
 static struct ctl_table_root sysctl_table_root;
 static struct ctl_table_header root_table_header = {
@@ -567,7 +589,7 @@ static struct ctl_table kern_table[] = {
                 .data           = &__sysrq_enabled,
                 .maxlen         = sizeof (int),
                 .mode           = 0644,
-                .proc_handler   = proc_dointvec,
+                .proc_handler   = sysrq_sysctl_handler,
         },
 #endif
 #ifdef CONFIG_PROC_SYSCTL
@@ -621,7 +643,7 @@ static struct ctl_table kern_table[] = {
 #endif
         {
                 .procname       = "userprocess_debug",
-                .data           = &sysctl_userprocess_debug,
+                .data           = &show_unhandled_signals,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
                 .proc_handler   = proc_dointvec,
@@ -1423,6 +1445,14 @@ static struct ctl_table fs_table[] = {
                 .child          = binfmt_misc_table,
         },
 #endif
+        {
+                .procname       = "pipe-max-pages",
+                .data           = &pipe_max_pages,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_minmax,
+                .extra1         = &two,
+        },
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt
@@ -1431,7 +1461,8 @@ static struct ctl_table fs_table[] = {
 };
 
 static struct ctl_table debug_table[] = {
-#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
+#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
+    defined(CONFIG_S390)
         {
                 .procname       = "exception-trace",
                 .data           = &show_unhandled_signals,
@@ -2040,8 +2071,132 @@ int proc_dostring(struct ctl_table *table, int write,
                                buffer, lenp, ppos);
 }
 
+static size_t proc_skip_spaces(char **buf)
+{
+        size_t ret;
+        char *tmp = skip_spaces(*buf);
+        ret = tmp - *buf;
+        *buf = tmp;
+        return ret;
+}
+
+static void proc_skip_char(char **buf, size_t *size, const char v)
+{
+        while (*size) {
+                if (**buf != v)
+                        break;
+                (*size)--;
+                (*buf)++;
+        }
+}
+
+#define TMPBUFLEN 22
+/**
+ * proc_get_long - reads an ASCII formatted integer from a user buffer
+ *
+ * @buf: a kernel buffer
+ * @size: size of the kernel buffer
+ * @val: this is where the number will be stored
+ * @neg: set to %TRUE if number is negative
+ * @perm_tr: a vector which contains the allowed trailers
+ * @perm_tr_len: size of the perm_tr vector
+ * @tr: pointer to store the trailer character
+ *
+ * In case of success %0 is returned and @buf and @size are updated with
+ * the amount of bytes read. If @tr is non-NULL and a trailing
+ * character exists (size is non-zero after returning from this
+ * function), @tr is updated with the trailing character.
+ */
+static int proc_get_long(char **buf, size_t *size,
+                          unsigned long *val, bool *neg,
+                          const char *perm_tr, unsigned perm_tr_len, char *tr)
+{
+        int len;
+        char *p, tmp[TMPBUFLEN];
+
+        if (!*size)
+                return -EINVAL;
+
+        len = *size;
+        if (len > TMPBUFLEN - 1)
+                len = TMPBUFLEN - 1;
+
+        memcpy(tmp, *buf, len);
+
+        tmp[len] = 0;
+        p = tmp;
+        if (*p == '-' && *size > 1) {
+                *neg = true;
+                p++;
+        } else
+                *neg = false;
+        if (!isdigit(*p))
+                return -EINVAL;
+
+        *val = simple_strtoul(p, &p, 0);
+
+        len = p - tmp;
+
+        /* We don't know if the next char is whitespace thus we may accept
+         * invalid integers (e.g. 1234...a) or two integers instead of one
+         * (e.g. 123...1). So lets not allow such large numbers. */
+        if (len == TMPBUFLEN - 1)
+                return -EINVAL;
+
+        if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
+                return -EINVAL;
+
+        if (tr && (len < *size))
+                *tr = *p;
+
+        *buf += len;
+        *size -= len;
+
+        return 0;
+}
+
+/**
+ * proc_put_long - converts an integer to a decimal ASCII formatted string
+ *
+ * @buf: the user buffer
+ * @size: the size of the user buffer
+ * @val: the integer to be converted
+ * @neg: sign of the number, %TRUE for negative
+ *
+ * In case of success %0 is returned and @buf and @size are updated with
+ * the amount of bytes written.
+ */
+static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
+                          bool neg)
+{
+        int len;
+        char tmp[TMPBUFLEN], *p = tmp;
+
+        sprintf(p, "%s%lu", neg ? "-" : "", val);
+        len = strlen(tmp);
+        if (len > *size)
+                len = *size;
+        if (copy_to_user(*buf, tmp, len))
+                return -EFAULT;
+        *size -= len;
+        *buf += len;
+        return 0;
+}
+#undef TMPBUFLEN
+
+static int proc_put_char(void __user **buf, size_t *size, char c)
+{
+        if (*size) {
+                char __user **buffer = (char __user **)buf;
+                if (put_user(c, *buffer))
+                        return -EFAULT;
+                (*size)--, (*buffer)++;
+                *buf = *buffer;
+        }
+        return 0;
+}
 
-static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
+static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
                                  int *valp,
                                  int write, void *data)
 {
@@ -2050,33 +2205,31 @@ static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
         } else {
                 int val = *valp;
                 if (val < 0) {
-                        *negp = -1;
+                        *negp = true;
                         *lvalp = (unsigned long)-val;
                 } else {
-                        *negp = 0;
+                        *negp = false;
                         *lvalp = (unsigned long)val;
                 }
         }
         return 0;
 }
 
+static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
+
 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
                   int write, void __user *buffer,
                   size_t *lenp, loff_t *ppos,
-                  int (*conv)(int *negp, unsigned long *lvalp, int *valp,
+                  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
                               int write, void *data),
                   void *data)
 {
-#define TMPBUFLEN 21
-        int *i, vleft, first = 1, neg;
-        unsigned long lval;
-        size_t left, len;
+        int *i, vleft, first = 1, err = 0;
+        unsigned long page = 0;
+        size_t left;
+        char *kbuf;
         
-        char buf[TMPBUFLEN], *p;
-        char __user *s = buffer;
-        
-        if (!tbl_data || !table->maxlen || !*lenp ||
-            (*ppos && !write)) {
+        if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
                 *lenp = 0;
                 return 0;
         }
@@ -2088,89 +2241,69 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
         if (!conv)
                 conv = do_proc_dointvec_conv;
 
+        if (write) {
+                if (left > PAGE_SIZE - 1)
+                        left = PAGE_SIZE - 1;
+                page = __get_free_page(GFP_TEMPORARY);
+                kbuf = (char *) page;
+                if (!kbuf)
+                        return -ENOMEM;
+                if (copy_from_user(kbuf, buffer, left)) {
+                        err = -EFAULT;
+                        goto free;
+                }
+                kbuf[left] = 0;
+        }
+
         for (; left && vleft--; i++, first=0) {
-                if (write) {
-                        while (left) {
-                                char c;
-                                if (get_user(c, s))
-                                        return -EFAULT;
-                                if (!isspace(c))
-                                        break;
-                                left--;
-                                s++;
-                        }
-                        if (!left)
-                                break;
-                        neg = 0;
-                        len = left;
-                        if (len > sizeof(buf) - 1)
-                                len = sizeof(buf) - 1;
-                        if (copy_from_user(buf, s, len))
-                                return -EFAULT;
-                        buf[len] = 0;
-                        p = buf;
-                        if (*p == '-' && left > 1) {
-                                neg = 1;
-                                p++;
-                        }
-                        if (*p < '0' || *p > '9')
-                                break;
+                unsigned long lval;
+                bool neg;
 
-                        lval = simple_strtoul(p, &p, 0);
+                if (write) {
+                        left -= proc_skip_spaces(&kbuf);
 
-                        len = p-buf;
-                        if ((len < left) && *p && !isspace(*p))
+                        err = proc_get_long(&kbuf, &left, &lval, &neg,
+                                             proc_wspace_sep,
+                                             sizeof(proc_wspace_sep), NULL);
+                        if (err)
                                 break;
-                        s += len;
-                        left -= len;
-
-                        if (conv(&neg, &lval, i, 1, data))
+                        if (conv(&neg, &lval, i, 1, data)) {
+                                err = -EINVAL;
                                 break;
+                        }
                 } else {
-                        p = buf;
+                        if (conv(&neg, &lval, i, 0, data)) {
+                                err = -EINVAL;
+                                break;
+                        }
                         if (!first)
-                                *p++ = '\t';
-        
-                        if (conv(&neg, &lval, i, 0, data))
+                                err = proc_put_char(&buffer, &left, '\t');
+                        if (err)
+                                break;
+                        err = proc_put_long(&buffer, &left, lval, neg);
+                        if (err)
                                 break;
-
-                        sprintf(p, "%s%lu", neg ? "-" : "", lval);
-                        len = strlen(buf);
-                        if (len > left)
-                                len = left;
-                        if(copy_to_user(s, buf, len))
-                                return -EFAULT;
-                        left -= len;
-                        s += len;
                 }
         }
 
-        if (!write && !first && left) {
-                if(put_user('\n', s))
-                        return -EFAULT;
-                left--, s++;
-        }
+        if (!write && !first && left && !err)
+                err = proc_put_char(&buffer, &left, '\n');
+        if (write && !err)
+                left -= proc_skip_spaces(&kbuf);
+free:
         if (write) {
-                while (left) {
-                        char c;
-                        if (get_user(c, s++))
-                                return -EFAULT;
-                        if (!isspace(c))
-                                break;
-                        left--;
-                }
+                free_page(page);
+                if (first)
+                        return err ? : -EINVAL;
         }
-        if (write && first)
-                return -EINVAL;
         *lenp -= left;
         *ppos += *lenp;
-        return 0;
-#undef TMPBUFLEN
+        return err;
 }
 
 static int do_proc_dointvec(struct ctl_table *table, int write,
                   void __user *buffer, size_t *lenp, loff_t *ppos,
-                  int (*conv)(int *negp, unsigned long *lvalp, int *valp,
+                  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
                               int write, void *data),
                   void *data)
 {
@@ -2238,8 +2371,8 @@ struct do_proc_dointvec_minmax_conv_param {
         int *max;
 };
 
-static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
-                                        int *valp, 
+static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
+                                        int *valp,
                                         int write, void *data)
 {
         struct do_proc_dointvec_minmax_conv_param *param = data;
@@ -2252,10 +2385,10 @@ static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
         } else {
                 int val = *valp;
                 if (val < 0) {
-                        *negp = -1;
+                        *negp = true;
                         *lvalp = (unsigned long)-val;
                 } else {
-                        *negp = 0;
+                        *negp = false;
                         *lvalp = (unsigned long)val;
                 }
         }
@@ -2295,102 +2428,78 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
                                      unsigned long convmul,
                                      unsigned long convdiv)
 {
-#define TMPBUFLEN 21
-        unsigned long *i, *min, *max, val;
-        int vleft, first=1, neg;
-        size_t len, left;
-        char buf[TMPBUFLEN], *p;
-        char __user *s = buffer;
-        
-        if (!data || !table->maxlen || !*lenp ||
-            (*ppos && !write)) {
+        unsigned long *i, *min, *max;
+        int vleft, first = 1, err = 0;
+        unsigned long page = 0;
+        size_t left;
+        char *kbuf;
+
+        if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
                 *lenp = 0;
                 return 0;
         }
-        
+
         i = (unsigned long *) data;
         min = (unsigned long *) table->extra1;
         max = (unsigned long *) table->extra2;
         vleft = table->maxlen / sizeof(unsigned long);
         left = *lenp;
-        
+
+        if (write) {
+                if (left > PAGE_SIZE - 1)
+                        left = PAGE_SIZE - 1;
+                page = __get_free_page(GFP_TEMPORARY);
+                kbuf = (char *) page;
+                if (!kbuf)
+                        return -ENOMEM;
+                if (copy_from_user(kbuf, buffer, left)) {
+                        err = -EFAULT;
+                        goto free;
+                }
+                kbuf[left] = 0;
+        }
+
         for (; left && vleft--; i++, min++, max++, first=0) {
+                unsigned long val;
+
                 if (write) {
-                        while (left) {
-                                char c;
-                                if (get_user(c, s))
-                                        return -EFAULT;
-                                if (!isspace(c))
-                                        break;
-                                left--;
-                                s++;
-                        }
-                        if (!left)
-                                break;
-                        neg = 0;
-                        len = left;
-                        if (len > TMPBUFLEN-1)
-                                len = TMPBUFLEN-1;
-                        if (copy_from_user(buf, s, len))
-                                return -EFAULT;
-                        buf[len] = 0;
-                        p = buf;
-                        if (*p == '-' && left > 1) {
-                                neg = 1;
-                                p++;
-                        }
-                        if (*p < '0' || *p > '9')
-                                break;
-                        val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
-                        len = p-buf;
-                        if ((len < left) && *p && !isspace(*p))
+                        bool neg;
+
+                        left -= proc_skip_spaces(&kbuf);
+
+                        err = proc_get_long(&kbuf, &left, &val, &neg,
+                                             proc_wspace_sep,
+                                             sizeof(proc_wspace_sep), NULL);
+                        if (err)
                                 break;
                         if (neg)
-                                val = -val;
-                        s += len;
-                        left -= len;
-
-                        if(neg)
                                 continue;
                         if ((min && val < *min) || (max && val > *max))
                                 continue;
                         *i = val;
                 } else {
-                        p = buf;
+                        val = convdiv * (*i) / convmul;
                         if (!first)
-                                *p++ = '\t';
-                        sprintf(p, "%lu", convdiv * (*i) / convmul);
-                        len = strlen(buf);
-                        if (len > left)
-                                len = left;
-                        if(copy_to_user(s, buf, len))
-                                return -EFAULT;
-                        left -= len;
-                        s += len;
+                                err = proc_put_char(&buffer, &left, '\t');
+                        err = proc_put_long(&buffer, &left, val, false);
+                        if (err)
+                                break;
                 }
         }
 
-        if (!write && !first && left) {
-                if(put_user('\n', s))
-                        return -EFAULT;
-                left--, s++;
-        }
+        if (!write && !first && left && !err)
+                err = proc_put_char(&buffer, &left, '\n');
+        if (write && !err)
+                left -= proc_skip_spaces(&kbuf);
+free:
         if (write) {
-                while (left) {
-                        char c;
-                        if (get_user(c, s++))
-                                return -EFAULT;
-                        if (!isspace(c))
-                                break;
-                        left--;
-                }
+                free_page(page);
+                if (first)
+                        return err ? : -EINVAL;
         }
-        if (write && first)
-                return -EINVAL;
         *lenp -= left;
         *ppos += *lenp;
-        return 0;
-#undef TMPBUFLEN
+        return err;
 }
 
 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
@@ -2451,7 +2560,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
 }
 
 
-static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
+static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
                                          int *valp,
                                          int write, void *data)
 {
@@ -2463,10 +2572,10 @@ static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
                 int val = *valp;
                 unsigned long lval;
                 if (val < 0) {
-                        *negp = -1;
+                        *negp = true;
                         lval = (unsigned long)-val;
                 } else {
-                        *negp = 0;
+                        *negp = false;
                         lval = (unsigned long)val;
                 }
                 *lvalp = lval / HZ;
@@ -2474,7 +2583,7 @@ static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
         return 0;
 }
 
-static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
+static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
                                                 int *valp,
                                                 int write, void *data)
 {
@@ -2486,10 +2595,10 @@ static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
                 int val = *valp;
                 unsigned long lval;
                 if (val < 0) {
-                        *negp = -1;
+                        *negp = true;
                         lval = (unsigned long)-val;
                 } else {
-                        *negp = 0;
+                        *negp = false;
                         lval = (unsigned long)val;
                 }
                 *lvalp = jiffies_to_clock_t(lval);
@@ -2497,7 +2606,7 @@ static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
         return 0;
 }
 
-static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
+static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
                                             int *valp,
                                             int write, void *data)
 {
@@ -2507,10 +2616,10 @@ static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
                 int val = *valp;
                 unsigned long lval;
                 if (val < 0) {
-                        *negp = -1;
+                        *negp = true;
                         lval = (unsigned long)-val;
                 } else {
-                        *negp = 0;
+                        *negp = false;
                         lval = (unsigned long)val;
                 }
                 *lvalp = jiffies_to_msecs(lval);
@@ -2607,6 +2716,157 @@ static int proc_do_cad_pid(struct ctl_table *table, int write,
         return 0;
 }
 
+/**
+ * proc_do_large_bitmap - read/write from/to a large bitmap
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * The bitmap is stored at table->data and the bitmap length (in bits)
+ * in table->maxlen.
+ *
+ * We use a range comma separated format (e.g. 1,3-4,10-10) so that
+ * large bitmaps may be represented in a compact manner. Writing into
+ * the file will clear the bitmap then update it with the given input.
+ *
+ * Returns 0 on success.
+ */
+int proc_do_large_bitmap(struct ctl_table *table, int write,
+                         void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+        int err = 0;
+        bool first = 1;
+        size_t left = *lenp;
+        unsigned long bitmap_len = table->maxlen;
+        unsigned long *bitmap = (unsigned long *) table->data;
+        unsigned long *tmp_bitmap = NULL;
+        char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
+
+        if (!bitmap_len || !left || (*ppos && !write)) {
+                *lenp = 0;
+                return 0;
+        }
+
+        if (write) {
+                unsigned long page = 0;
+                char *kbuf;
+
+                if (left > PAGE_SIZE - 1)
+                        left = PAGE_SIZE - 1;
+
+                page = __get_free_page(GFP_TEMPORARY);
+                kbuf = (char *) page;
+                if (!kbuf)
+                        return -ENOMEM;
+                if (copy_from_user(kbuf, buffer, left)) {
+                        free_page(page);
+                        return -EFAULT;
+                }
+                kbuf[left] = 0;
+
+                tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
+                                     GFP_KERNEL);
+                if (!tmp_bitmap) {
+                        free_page(page);
+                        return -ENOMEM;
+                }
+                proc_skip_char(&kbuf, &left, '\n');
+                while (!err && left) {
+                        unsigned long val_a, val_b;
+                        bool neg;
+
+                        err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
+                                             sizeof(tr_a), &c);
+                        if (err)
+                                break;
+                        if (val_a >= bitmap_len || neg) {
+                                err = -EINVAL;
+                                break;
+                        }
+
+                        val_b = val_a;
+                        if (left) {
+                                kbuf++;
+                                left--;
+                        }
+
+                        if (c == '-') {
+                                err = proc_get_long(&kbuf, &left, &val_b,
+                                                     &neg, tr_b, sizeof(tr_b),
+                                                     &c);
+                                if (err)
+                                        break;
+                                if (val_b >= bitmap_len || neg ||
+                                    val_a > val_b) {
+                                        err = -EINVAL;
+                                        break;
+                                }
+                                if (left) {
+                                        kbuf++;
+                                        left--;
+                                }
+                        }
+
+                        while (val_a <= val_b)
+                                set_bit(val_a++, tmp_bitmap);
+
+                        first = 0;
+                        proc_skip_char(&kbuf, &left, '\n');
+                }
+                free_page(page);
+        } else {
+                unsigned long bit_a, bit_b = 0;
+
+                while (left) {
+                        bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
+                        if (bit_a >= bitmap_len)
+                                break;
+                        bit_b = find_next_zero_bit(bitmap, bitmap_len,
+                                                   bit_a + 1) - 1;
+
+                        if (!first) {
+                                err = proc_put_char(&buffer, &left, ',');
+                                if (err)
+                                        break;
+                        }
+                        err = proc_put_long(&buffer, &left, bit_a, false);
+                        if (err)
+                                break;
+                        if (bit_a != bit_b) {
+                                err = proc_put_char(&buffer, &left, '-');
+                                if (err)
+                                        break;
+                                err = proc_put_long(&buffer, &left, bit_b, false);
+                                if (err)
+                                        break;
+                        }
+
+                        first = 0; bit_b++;
+                }
+                if (!err)
+                        err = proc_put_char(&buffer, &left, '\n');
+        }
+
+        if (!err) {
+                if (write) {
+                        if (*ppos)
+                                bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
+                        else
+                                memcpy(bitmap, tmp_bitmap,
+                                        BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
+                }
+                kfree(tmp_bitmap);
+                *lenp -= left;
+                *ppos += *lenp;
+                return 0;
+        } else {
+                kfree(tmp_bitmap);
+                return err;
+        }
+}
+
 #else /* CONFIG_PROC_FS */
 
 int proc_dostring(struct ctl_table *table, int write,
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 59030570f5ca..937d31dc8566 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -224,7 +224,6 @@ static const struct bin_table bin_net_ipv4_route_table[] = {
         { CTL_INT,      NET_IPV4_ROUTE_MTU_EXPIRES,             "mtu_expires" },
         { CTL_INT,      NET_IPV4_ROUTE_MIN_PMTU,                "min_pmtu" },
         { CTL_INT,      NET_IPV4_ROUTE_MIN_ADVMSS,              "min_adv_mss" },
-        { CTL_INT,      NET_IPV4_ROUTE_SECRET_INTERVAL,         "secret_interval" },
         {}
 };
 
diff --git a/kernel/time.c b/kernel/time.c
index 656dccfe1cbb..50612faa9baf 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -132,12 +132,11 @@ SYSCALL_DEFINE2(gettimeofday, struct timeval __user *, tv,
  */
 static inline void warp_clock(void)
 {
-        write_seqlock_irq(&xtime_lock);
-        wall_to_monotonic.tv_sec -= sys_tz.tz_minuteswest * 60;
-        xtime.tv_sec += sys_tz.tz_minuteswest * 60;
-        update_xtime_cache(0);
-        write_sequnlock_irq(&xtime_lock);
-        clock_was_set();
+        struct timespec delta, adjust;
+        delta.tv_sec = sys_tz.tz_minuteswest * 60;
+        delta.tv_nsec = 0;
+        adjust = timespec_add_safe(current_kernel_time(), delta);
+        do_settimeofday(&adjust);
 }
 
 /*
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 1f5dde637457..f08e99c1d561 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -625,6 +625,54 @@ static void clocksource_enqueue(struct clocksource *cs)
         list_add(&cs->list, entry);
 }
 
+
+/*
+ * Maximum time we expect to go between ticks. This includes idle
+ * tickless time. It provides the trade off between selecting a
+ * mult/shift pair that is very precise but can only handle a short
+ * period of time, vs. a mult/shift pair that can handle long periods
+ * of time but isn't as precise.
+ *
+ * This is a subsystem constant, and actual hardware limitations
+ * may override it (ie: clocksources that wrap every 3 seconds).
+ */
+#define MAX_UPDATE_LENGTH 5 /* Seconds */
+
+/**
+ * __clocksource_register_scale - Used to install new clocksources
+ * @t:          clocksource to be registered
+ * @scale:      Scale factor multiplied against freq to get clocksource hz
+ * @freq:       clocksource frequency (cycles per second) divided by scale
+ *
+ * Returns -EBUSY if registration fails, zero otherwise.
+ *
+ * This *SHOULD NOT* be called directly! Please use the
+ * clocksource_register_hz() or clocksource_register_khz helper functions.
+ */
+int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
+{
+
+        /*
+         * Ideally we want to use  some of the limits used in
+         * clocksource_max_deferment, to provide a more informed
+         * MAX_UPDATE_LENGTH. But for now this just gets the
+         * register interface working properly.
+         */
+        clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
+                                      NSEC_PER_SEC/scale,
+                                      MAX_UPDATE_LENGTH*scale);
+        cs->max_idle_ns = clocksource_max_deferment(cs);
+
+        mutex_lock(&clocksource_mutex);
+        clocksource_enqueue(cs);
+        clocksource_select();
+        clocksource_enqueue_watchdog(cs);
+        mutex_unlock(&clocksource_mutex);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(__clocksource_register_scale);
+
+
 /**
  * clocksource_register - Used to install new clocksources
  * @t:          clocksource to be registered
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 7c0f180d6e9d..c63116863a80 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -69,7 +69,7 @@ static s64			time_freq;
 /* time at last adjustment (secs):                                      */
 static long                     time_reftime;
 
-long                            time_adjust;
+static long                     time_adjust;
 
 /* constant (boot-param configurable) NTP tick adjustment (upscaled)    */
 static s64                      ntp_tick_adj;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 39f6177fafac..caf8d4d4f5c8 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -165,13 +165,6 @@ struct timespec raw_time;
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
 
-static struct timespec xtime_cache __attribute__ ((aligned (16)));
-void update_xtime_cache(u64 nsec)
-{
-        xtime_cache = xtime;
-        timespec_add_ns(&xtime_cache, nsec);
-}
-
 /* must hold xtime_lock */
 void timekeeping_leap_insert(int leapsecond)
 {
@@ -332,8 +325,6 @@ int do_settimeofday(struct timespec *tv)
 
         xtime = *tv;
 
-        update_xtime_cache(0);
-
         timekeeper.ntp_error = 0;
         ntp_clear();
 
@@ -559,7 +550,6 @@ void __init timekeeping_init(void)
         }
         set_normalized_timespec(&wall_to_monotonic,
                                 -boot.tv_sec, -boot.tv_nsec);
-        update_xtime_cache(0);
         total_sleep_time.tv_sec = 0;
         total_sleep_time.tv_nsec = 0;
         write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -593,7 +583,6 @@ static int timekeeping_resume(struct sys_device *dev)
                 wall_to_monotonic = timespec_sub(wall_to_monotonic, ts);
                 total_sleep_time = timespec_add_safe(total_sleep_time, ts);
         }
-        update_xtime_cache(0);
         /* re-base the last cycle value */
         timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
         timekeeper.ntp_error = 0;
@@ -788,7 +777,6 @@ void update_wall_time(void)
 {
         struct clocksource *clock;
         cycle_t offset;
-        u64 nsecs;
         int shift = 0, maxshift;
 
         /* Make sure we're fully resumed: */
@@ -847,7 +835,9 @@ void update_wall_time(void)
                 timekeeper.ntp_error += neg << timekeeper.ntp_error_shift;
         }
 
-        /* store full nanoseconds into xtime after rounding it up and
+
+        /*
+         * Store full nanoseconds into xtime after rounding it up and
          * add the remainder to the error difference.
          */
         xtime.tv_nsec = ((s64) timekeeper.xtime_nsec >> timekeeper.shift) + 1;
@@ -855,8 +845,15 @@ void update_wall_time(void)
         timekeeper.ntp_error += timekeeper.xtime_nsec <<
                                 timekeeper.ntp_error_shift;
 
-        nsecs = clocksource_cyc2ns(offset, timekeeper.mult, timekeeper.shift);
-        update_xtime_cache(nsecs);
+        /*
+         * Finally, make sure that after the rounding
+         * xtime.tv_nsec isn't larger then NSEC_PER_SEC
+         */
+        if (unlikely(xtime.tv_nsec >= NSEC_PER_SEC)) {
+                xtime.tv_nsec -= NSEC_PER_SEC;
+                xtime.tv_sec++;
+                second_overflow();
+        }
 
         /* check to see if there is a new clocksource to use */
         update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
@@ -896,13 +893,13 @@ EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
 
 unsigned long get_seconds(void)
 {
-        return xtime_cache.tv_sec;
+        return xtime.tv_sec;
 }
 EXPORT_SYMBOL(get_seconds);
 
 struct timespec __current_kernel_time(void)
 {
-        return xtime_cache;
+        return xtime;
 }
 
 struct timespec current_kernel_time(void)
@@ -913,7 +910,7 @@ struct timespec current_kernel_time(void)
         do {
                 seq = read_seqbegin(&xtime_lock);
 
-                now = xtime_cache;
+                now = xtime;
         } while (read_seqretry(&xtime_lock, seq));
 
         return now;
@@ -928,7 +925,7 @@ struct timespec get_monotonic_coarse(void)
         do {
                 seq = read_seqbegin(&xtime_lock);
 
-                now = xtime_cache;
+                now = xtime;
                 mono = wall_to_monotonic;
         } while (read_seqretry(&xtime_lock, seq));
 
diff --git a/kernel/timer.c b/kernel/timer.c
index aeb6a54f2771..9199f3c52215 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -319,6 +319,24 @@ unsigned long round_jiffies_up_relative(unsigned long j)
 }
 EXPORT_SYMBOL_GPL(round_jiffies_up_relative);
 
+/**
+ * set_timer_slack - set the allowed slack for a timer
+ * @slack_hz: the amount of time (in jiffies) allowed for rounding
+ *
+ * Set the amount of time, in jiffies, that a certain timer has
+ * in terms of slack. By setting this value, the timer subsystem
+ * will schedule the actual timer somewhere between
+ * the time mod_timer() asks for, and that time plus the slack.
+ *
+ * By setting the slack to -1, a percentage of the delay is used
+ * instead.
+ */
+void set_timer_slack(struct timer_list *timer, int slack_hz)
+{
+        timer->slack = slack_hz;
+}
+EXPORT_SYMBOL_GPL(set_timer_slack);
+
 
 static inline void set_running_timer(struct tvec_base *base,
                                         struct timer_list *timer)
@@ -550,6 +568,7 @@ static void __init_timer(struct timer_list *timer,
 {
         timer->entry.next = NULL;
         timer->base = __raw_get_cpu_var(tvec_bases);
+        timer->slack = -1;
 #ifdef CONFIG_TIMER_STATS
         timer->start_site = NULL;
         timer->start_pid = -1;
@@ -715,6 +734,41 @@ int mod_timer_pending(struct timer_list *timer, unsigned long expires)
 }
 EXPORT_SYMBOL(mod_timer_pending);
 
+/*
+ * Decide where to put the timer while taking the slack into account
+ *
+ * Algorithm:
+ *   1) calculate the maximum (absolute) time
+ *   2) calculate the highest bit where the expires and new max are different
+ *   3) use this bit to make a mask
+ *   4) use the bitmask to round down the maximum time, so that all last
+ *      bits are zeros
+ */
+static inline
+unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
+{
+        unsigned long expires_limit, mask;
+        int bit;
+
+        expires_limit = expires + timer->slack;
+
+        if (timer->slack < 0) /* auto slack: use 0.4% */
+                expires_limit = expires + (expires - jiffies)/256;
+
+        mask = expires ^ expires_limit;
+
+        if (mask == 0)
+                return expires;
+
+        bit = find_last_bit(&mask, BITS_PER_LONG);
+
+        mask = (1 << bit) - 1;
+
+        expires_limit = expires_limit & ~(mask);
+
+        return expires_limit;
+}
+
 /**
  * mod_timer - modify a timer's timeout
  * @timer: the timer to be modified
@@ -745,6 +799,8 @@ int mod_timer(struct timer_list *timer, unsigned long expires)
         if (timer_pending(timer) && timer->expires == expires)
                 return 1;
 
+        expires = apply_slack(timer, expires);
+
         return __mod_timer(timer, expires, false, TIMER_NOT_PINNED);
 }
 EXPORT_SYMBOL(mod_timer);
@@ -955,6 +1011,47 @@ static int cascade(struct tvec_base *base, struct tvec *tv, int index)
         return index;
 }
 
+static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long),
+                          unsigned long data)
+{
+        int preempt_count = preempt_count();
+
+#ifdef CONFIG_LOCKDEP
+        /*
+         * It is permissible to free the timer from inside the
+         * function that is called from it, this we need to take into
+         * account for lockdep too. To avoid bogus "held lock freed"
+         * warnings as well as problems when looking into
+         * timer->lockdep_map, make a copy and use that here.
+         */
+        struct lockdep_map lockdep_map = timer->lockdep_map;
+#endif
+        /*
+         * Couple the lock chain with the lock chain at
+         * del_timer_sync() by acquiring the lock_map around the fn()
+         * call here and in del_timer_sync().
+         */
+        lock_map_acquire(&lockdep_map);
+
+        trace_timer_expire_entry(timer);
+        fn(data);
+        trace_timer_expire_exit(timer);
+
+        lock_map_release(&lockdep_map);
+
+        if (preempt_count != preempt_count()) {
+                WARN_ONCE(1, "timer: %pF preempt leak: %08x -> %08x\n",
+                          fn, preempt_count, preempt_count());
+                /*
+                 * Restore the preempt count. That gives us a decent
+                 * chance to survive and extract information. If the
+                 * callback kept a lock held, bad luck, but not worse
+                 * than the BUG() we had.
+                 */
+                preempt_count() = preempt_count;
+        }
+}
+
 #define INDEX(N) ((base->timer_jiffies >> (TVR_BITS + (N) * TVN_BITS)) & TVN_MASK)
 
 /**
@@ -998,45 +1095,7 @@ static inline void __run_timers(struct tvec_base *base)
                         detach_timer(timer, 1);
 
                         spin_unlock_irq(&base->lock);
-                        {
-                                int preempt_count = preempt_count();
-
-#ifdef CONFIG_LOCKDEP
-                                /*
-                                 * It is permissible to free the timer from
-                                 * inside the function that is called from
-                                 * it, this we need to take into account for
-                                 * lockdep too. To avoid bogus "held lock
-                                 * freed" warnings as well as problems when
-                                 * looking into timer->lockdep_map, make a
-                                 * copy and use that here.
-                                 */
-                                struct lockdep_map lockdep_map =
-                                        timer->lockdep_map;
-#endif
-                                /*
-                                 * Couple the lock chain with the lock chain at
-                                 * del_timer_sync() by acquiring the lock_map
-                                 * around the fn() call here and in
-                                 * del_timer_sync().
-                                 */
-                                lock_map_acquire(&lockdep_map);
-
-                                trace_timer_expire_entry(timer);
-                                fn(data);
-                                trace_timer_expire_exit(timer);
-
-                                lock_map_release(&lockdep_map);
-
-                                if (preempt_count != preempt_count()) {
-                                        printk(KERN_ERR "huh, entered %p "
-                                               "with preempt_count %08x, exited"
-                                               " with %08x?\n",
-                                               fn, preempt_count,
-                                               preempt_count());
-                                        BUG();
-                                }
-                        }
+                        call_timer_fn(timer, fn, data);
                         spin_lock_irq(&base->lock);
                 }
         }
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 756d7283318b..8a76339a9e65 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3309,12 +3309,12 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
                                         size_t len,
                                         unsigned int flags)
 {
-        struct page *pages[PIPE_BUFFERS];
-        struct partial_page partial[PIPE_BUFFERS];
+        struct page *pages_def[PIPE_DEF_BUFFERS];
+        struct partial_page partial_def[PIPE_DEF_BUFFERS];
         struct trace_iterator *iter = filp->private_data;
         struct splice_pipe_desc spd = {
-                .pages          = pages,
-                .partial        = partial,
+                .pages          = pages_def,
+                .partial        = partial_def,
                 .nr_pages       = 0, /* This gets updated below. */
                 .flags          = flags,
                 .ops            = &tracing_pipe_buf_ops,
@@ -3325,6 +3325,9 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
         size_t rem;
         unsigned int i;
 
+        if (splice_grow_spd(pipe, &spd))
+                return -ENOMEM;
+
         /* copy the tracer to avoid using a global lock all around */
         mutex_lock(&trace_types_lock);
         if (unlikely(old_tracer != current_trace && current_trace)) {
@@ -3355,23 +3358,23 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
         trace_access_lock(iter->cpu_file);
 
         /* Fill as many pages as possible. */
-        for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) {
-                pages[i] = alloc_page(GFP_KERNEL);
-                if (!pages[i])
+        for (i = 0, rem = len; i < pipe->buffers && rem; i++) {
+                spd.pages[i] = alloc_page(GFP_KERNEL);
+                if (!spd.pages[i])
                         break;
 
                 rem = tracing_fill_pipe_page(rem, iter);
 
                 /* Copy the data into the page, so we can start over. */
                 ret = trace_seq_to_buffer(&iter->seq,
-                                          page_address(pages[i]),
+                                          page_address(spd.pages[i]),
                                           iter->seq.len);
                 if (ret < 0) {
-                        __free_page(pages[i]);
+                        __free_page(spd.pages[i]);
                         break;
                 }
-                partial[i].offset = 0;
-                partial[i].len = iter->seq.len;
+                spd.partial[i].offset = 0;
+                spd.partial[i].len = iter->seq.len;
 
                 trace_seq_init(&iter->seq);
         }
@@ -3382,12 +3385,14 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
 
         spd.nr_pages = i;
 
-        return splice_to_pipe(pipe, &spd);
+        ret = splice_to_pipe(pipe, &spd);
+out:
+        splice_shrink_spd(pipe, &spd);
+        return ret;
 
 out_err:
         mutex_unlock(&iter->mutex);
-
-        return ret;
+        goto out;
 }
 
 static ssize_t
@@ -3786,11 +3791,11 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                             unsigned int flags)
 {
         struct ftrace_buffer_info *info = file->private_data;
-        struct partial_page partial[PIPE_BUFFERS];
-        struct page *pages[PIPE_BUFFERS];
+        struct partial_page partial_def[PIPE_DEF_BUFFERS];
+        struct page *pages_def[PIPE_DEF_BUFFERS];
         struct splice_pipe_desc spd = {
-                .pages          = pages,
-                .partial        = partial,
+                .pages          = pages_def,
+                .partial        = partial_def,
                 .flags          = flags,
                 .ops            = &buffer_pipe_buf_ops,
                 .spd_release    = buffer_spd_release,
@@ -3799,22 +3804,28 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
         int entries, size, i;
         size_t ret;
 
+        if (splice_grow_spd(pipe, &spd))
+                return -ENOMEM;
+
         if (*ppos & (PAGE_SIZE - 1)) {
                 WARN_ONCE(1, "Ftrace: previous read must page-align\n");
-                return -EINVAL;
+                ret = -EINVAL;
+                goto out;
         }
 
         if (len & (PAGE_SIZE - 1)) {
                 WARN_ONCE(1, "Ftrace: splice_read should page-align\n");
-                if (len < PAGE_SIZE)
-                        return -EINVAL;
+                if (len < PAGE_SIZE) {
+                        ret = -EINVAL;
+                        goto out;
+                }
                 len &= PAGE_MASK;
         }
 
         trace_access_lock(info->cpu);
         entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
 
-        for (i = 0; i < PIPE_BUFFERS && len && entries; i++, len -= PAGE_SIZE) {
+        for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) {
                 struct page *page;
                 int r;
 
@@ -3869,11 +3880,12 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                 else
                         ret = 0;
                 /* TODO: block */
-                return ret;
+                goto out;
         }
 
         ret = splice_to_pipe(pipe, &spd);
-
+        splice_shrink_spd(pipe, &spd);
+out:
         return ret;
 }
 
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 2404c129a8c9..ab13d7008061 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -209,6 +209,7 @@ int trace_seq_putc(struct trace_seq *s, unsigned char c)
 
         return 1;
 }
+EXPORT_SYMBOL(trace_seq_putc);
 
 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 {
@@ -355,6 +356,21 @@ ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 }
 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 
+const char *
+ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
+{
+        int i;
+        const char *ret = p->buffer + p->len;
+
+        for (i = 0; i < buf_len; i++)
+                trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
+
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+EXPORT_SYMBOL(ftrace_print_hex_seq);
+
 #ifdef CONFIG_KRETPROBES
 static inline const char *kretprobed(const char *name)
 {
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 076c7c8215b0..b2d70d38dff4 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -54,8 +54,8 @@ int create_user_ns(struct cred *new)
 #endif
         /* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */
 
-        /* alloc_uid() incremented the userns refcount.  Just set it to 1 */
-        kref_set(&ns->kref, 1);
+        /* root_user holds a reference to ns, our reference can be dropped */
+        put_user_ns(ns);
 
         return 0;
 }
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5bfb213984b2..77dabbf64b8f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -229,6 +229,16 @@ static inline void set_wq_data(struct work_struct *work,
         atomic_long_set(&work->data, new);
 }
 
+/*
+ * Clear WORK_STRUCT_PENDING and the workqueue on which it was queued.
+ */
+static inline void clear_wq_data(struct work_struct *work)
+{
+        unsigned long flags = *work_data_bits(work) &
+                                (1UL << WORK_STRUCT_STATIC);
+        atomic_long_set(&work->data, flags);
+}
+
 static inline
 struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
 {
@@ -671,7 +681,7 @@ static int __cancel_work_timer(struct work_struct *work,
                 wait_on_work(work);
         } while (unlikely(ret < 0));
 
-        work_clear_pending(work);
+        clear_wq_data(work);
         return ret;
 }
 
@@ -845,6 +855,30 @@ int schedule_on_each_cpu(work_func_t func)
         return 0;
 }
 
+/**
+ * flush_scheduled_work - ensure that any scheduled work has run to completion.
+ *
+ * Forces execution of the kernel-global workqueue and blocks until its
+ * completion.
+ *
+ * Think twice before calling this function!  It's very easy to get into
+ * trouble if you don't take great care.  Either of the following situations
+ * will lead to deadlock:
+ *
+ *      One of the work items currently on the workqueue needs to acquire
+ *      a lock held by your code or its caller.
+ *
+ *      Your code is running in the context of a work routine.
+ *
+ * They will be detected by lockdep when they occur, but the first might not
+ * occur very often.  It depends on what work items are on the workqueue and
+ * what locks they need, which you have no control over.
+ *
+ * In most situations flushing the entire workqueue is overkill; you merely
+ * need to know that a particular work item isn't queued and isn't running.
+ * In such cases you should use cancel_delayed_work_sync() or
+ * cancel_work_sync() instead.
+ */
 void flush_scheduled_work(void)
 {
         flush_workqueue(keventd_wq);