From: Oleg Nesterov <oleg@tv-sign.ru>

lock_task_sighand() was changed, send_sigqueue() doesn't need rcu_read_lock()
any longer.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/signal.c |    4 ----
 1 file changed, 4 deletions(-)

diff -puN kernel/signal.c~signals-send_sigqueue-dont-take-rcu-lock kernel/signal.c
--- a/kernel/signal.c~signals-send_sigqueue-dont-take-rcu-lock
+++ a/kernel/signal.c
@@ -1311,8 +1311,6 @@ int send_sigqueue(int sig, struct sigque
 	 * We return -1, when the task is marked exiting, so
 	 * posix_timer_event can redirect it to the group leader
 	 */
-	rcu_read_lock();
-
 	if (!likely(lock_task_sighand(p, &flags)))
 		goto out_err;
 
@@ -1323,8 +1321,6 @@ int send_sigqueue(int sig, struct sigque
 
 	unlock_task_sighand(p, &flags);
 out_err:
-	rcu_read_unlock();
-
 	return ret;
 }
 
_