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

Just a trivial example, more to come.

k_getrusage() holds rcu_read_lock() because it was previously required by
lock_task_sighand().  Unneeded now.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/sys.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff -puN kernel/sys.c~k_getrusage-dont-take-rcu_read_lock kernel/sys.c
--- a/kernel/sys.c~k_getrusage-dont-take-rcu_read_lock
+++ a/kernel/sys.c
@@ -1566,11 +1566,8 @@ static void k_getrusage(struct task_stru
 		goto out;
 	}
 
-	rcu_read_lock();
-	if (!lock_task_sighand(p, &flags)) {
-		rcu_read_unlock();
+	if (!lock_task_sighand(p, &flags))
 		return;
-	}
 
 	switch (who) {
 		case RUSAGE_BOTH:
@@ -1606,9 +1603,7 @@ static void k_getrusage(struct task_stru
 		default:
 			BUG();
 	}
-
 	unlock_task_sighand(p, &flags);
-	rcu_read_unlock();
 
 out:
 	cputime_to_timeval(utime, &r->ru_utime);
_