From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 26 May 2010 21:43:20 +0000 (-0700)
Subject: exit: move taskstats_tgid_free() from __exit_signal() to free_signal_struct()
X-Git-Url: https://git.karo-electronics.de/?p=mv-sheeva.git;a=commitdiff_plain;h=97101eb41d0d3c97543878ce40e0b8a8b2747ed7

exit: move taskstats_tgid_free() from __exit_signal() to free_signal_struct()

Move taskstats_tgid_free() from __exit_signal() to free_signal_struct().

This way signal->stats never points to nowhere and we can read ->stats
lockless.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Veaceslav Falico <vfalico@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/exit.c b/kernel/exit.c
index 3602f468e3a..357d443d5a0 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -144,7 +144,6 @@ static void __exit_signal(struct task_struct *tsk)
 	clear_tsk_thread_flag(tsk,TIF_SIGPENDING);
 	if (group_dead) {
 		flush_sigqueue(&sig->shared_pending);
-		taskstats_tgid_free(sig);
 		tty_kref_put(tty);
 	}
 }
diff --git a/kernel/fork.c b/kernel/fork.c
index 58f8611b1ac..7701470ea1b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -167,6 +167,7 @@ EXPORT_SYMBOL(free_task);
 
 static inline void free_signal_struct(struct signal_struct *sig)
 {
+	taskstats_tgid_free(sig);
 	kmem_cache_free(signal_cachep, sig);
 }