1 files changed, 28 insertions, 9 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 266c6af6ef1b..5b2959b3ffc2 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -64,6 +64,7 @@
 #include <linux/magic.h>
 #include <linux/perf_event.h>
 #include <linux/posix-timers.h>
+#include <linux/user-return-notifier.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -91,7 +92,7 @@ int nr_processes(void)
         int cpu;
         int total = 0;
 
-        for_each_online_cpu(cpu)
+        for_each_possible_cpu(cpu)
                 total += per_cpu(process_counts, cpu);
 
         return total;
@@ -249,6 +250,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
                 goto out;
 
         setup_thread_stack(tsk, orig);
+        clear_user_return_notifier(tsk);
         stackend = end_of_stack(tsk);
         *stackend = STACK_END_MAGIC;    /* for overflow detection */
 
@@ -570,12 +572,18 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
 
         /* Get rid of any futexes when releasing the mm */
 #ifdef CONFIG_FUTEX
-        if (unlikely(tsk->robust_list))
+        if (unlikely(tsk->robust_list)) {
                 exit_robust_list(tsk);
+                tsk->robust_list = NULL;
+        }
 #ifdef CONFIG_COMPAT
-        if (unlikely(tsk->compat_robust_list))
+        if (unlikely(tsk->compat_robust_list)) {
                 compat_exit_robust_list(tsk);
+                tsk->compat_robust_list = NULL;
+        }
 #endif
+        if (unlikely(!list_empty(&tsk->pi_state_list)))
+                exit_pi_state_list(tsk);
 #endif
 
         /* Get rid of any cached register state */
@@ -878,6 +886,9 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
         sig->gtime = cputime_zero;
         sig->cgtime = cputime_zero;
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
+        sig->prev_utime = sig->prev_stime = cputime_zero;
+#endif
         sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
         sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
         sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
@@ -928,9 +939,9 @@ SYSCALL_DEFINE1(set_tid_address, int __user *, tidptr)
 
 static void rt_mutex_init_task(struct task_struct *p)
 {
-        spin_lock_init(&p->pi_lock);
+        raw_spin_lock_init(&p->pi_lock);
 #ifdef CONFIG_RT_MUTEXES
-        plist_head_init(&p->pi_waiters, &p->pi_lock);
+        plist_head_init_raw(&p->pi_waiters, &p->pi_lock);
         p->pi_blocked_on = NULL;
 #endif
 }
@@ -1060,8 +1071,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->gtime = cputime_zero;
         p->utimescaled = cputime_zero;
         p->stimescaled = cputime_zero;
+#ifndef CONFIG_VIRT_CPU_ACCOUNTING
         p->prev_utime = cputime_zero;
         p->prev_stime = cputime_zero;
+#endif
 
         p->default_timer_slack_ns = current->timer_slack_ns;
 
@@ -1114,6 +1127,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
         p->blocked_on = NULL; /* not blocked yet */
 #endif
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+        p->memcg_batch.do_batch = 0;
+        p->memcg_batch.memcg = NULL;
+#endif
 
         p->bts = NULL;
 
@@ -1193,9 +1210,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 p->sas_ss_sp = p->sas_ss_size = 0;
 
         /*
-         * Syscall tracing should be turned off in the child regardless
-         * of CLONE_PTRACE.
+         * Syscall tracing and stepping should be turned off in the
+         * child regardless of CLONE_PTRACE.
          */
+        user_disable_single_step(p);
         clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE);
 #ifdef TIF_SYSCALL_EMU
         clear_tsk_thread_flag(p, TIF_SYSCALL_EMU);
@@ -1273,7 +1291,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         }
 
         if (likely(p->pid)) {
-                list_add_tail(&p->sibling, &p->real_parent->children);
                 tracehook_finish_clone(p, clone_flags, trace);
 
                 if (thread_group_leader(p)) {
@@ -1285,6 +1302,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                         p->signal->tty = tty_kref_get(current->signal->tty);
                         attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
                         attach_pid(p, PIDTYPE_SID, task_session(current));
+                        list_add_tail(&p->sibling, &p->real_parent->children);
                         list_add_tail_rcu(&p->tasks, &init_task.tasks);
                         __get_cpu_var(process_counts)++;
                 }
@@ -1304,7 +1322,8 @@ bad_fork_free_pid:
         if (pid != &init_struct_pid)
                 free_pid(pid);
 bad_fork_cleanup_io:
-        put_io_context(p->io_context);
+        if (p->io_context)
+                exit_io_context(p);
 bad_fork_cleanup_namespaces:
         exit_task_namespaces(p);
 bad_fork_cleanup_mm: