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-rw-r--r--kernel/fork.c47
1 files changed, 9 insertions, 38 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index b0ec34abc0bb..4799c5f0e6d0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -86,7 +86,14 @@ int max_threads; /* tunable limit on nr_threads */
DEFINE_PER_CPU(unsigned long, process_counts) = 0;
__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */
-EXPORT_SYMBOL_GPL(tasklist_lock);
+
+#ifdef CONFIG_PROVE_RCU
+int lockdep_tasklist_lock_is_held(void)
+{
+ return lockdep_is_held(&tasklist_lock);
+}
+EXPORT_SYMBOL_GPL(lockdep_tasklist_lock_is_held);
+#endif /* #ifdef CONFIG_PROVE_RCU */
int nr_processes(void)
{
@@ -833,17 +840,6 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
/* Thread group counters. */
thread_group_cputime_init(sig);
- /* Expiration times and increments. */
- sig->it[CPUCLOCK_PROF].expires = cputime_zero;
- sig->it[CPUCLOCK_PROF].incr = cputime_zero;
- sig->it[CPUCLOCK_VIRT].expires = cputime_zero;
- sig->it[CPUCLOCK_VIRT].incr = cputime_zero;
-
- /* Cached expiration times. */
- sig->cputime_expires.prof_exp = cputime_zero;
- sig->cputime_expires.virt_exp = cputime_zero;
- sig->cputime_expires.sched_exp = 0;
-
cpu_limit = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
if (cpu_limit != RLIM_INFINITY) {
sig->cputime_expires.prof_exp = secs_to_cputime(cpu_limit);
@@ -863,7 +859,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
if (clone_flags & CLONE_THREAD)
return 0;
- sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
+ sig = kmem_cache_zalloc(signal_cachep, GFP_KERNEL);
tsk->signal = sig;
if (!sig)
return -ENOMEM;
@@ -871,46 +867,21 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
atomic_set(&sig->count, 1);
atomic_set(&sig->live, 1);
init_waitqueue_head(&sig->wait_chldexit);
- sig->flags = 0;
if (clone_flags & CLONE_NEWPID)
sig->flags |= SIGNAL_UNKILLABLE;
- sig->group_exit_code = 0;
- sig->group_exit_task = NULL;
- sig->group_stop_count = 0;
sig->curr_target = tsk;
init_sigpending(&sig->shared_pending);
INIT_LIST_HEAD(&sig->posix_timers);
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- sig->it_real_incr.tv64 = 0;
sig->real_timer.function = it_real_fn;
- sig->leader = 0; /* session leadership doesn't inherit */
- sig->tty_old_pgrp = NULL;
- sig->tty = NULL;
-
- 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;
- sig->maxrss = sig->cmaxrss = 0;
- task_io_accounting_init(&sig->ioac);
- sig->sum_sched_runtime = 0;
- taskstats_tgid_init(sig);
-
task_lock(current->group_leader);
memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
task_unlock(current->group_leader);
posix_cpu_timers_init_group(sig);
- acct_init_pacct(&sig->pacct);
-
tty_audit_fork(sig);
sig->oom_adj = current->signal->oom_adj;