copy_signal() cleanup: use zalloc and remove initializations

Use kmem_cache_zalloc() on signal creation and remove unneeded
initialization lines in copy_signal().

Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 26 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index b0ec34abc0bb..ce2666f84d85 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -863,7 +863,7 @@ 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 +871,21 @@ 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;