[PATCH 2/2] getrusage: use __for_each_thread()

[Oleg Nesterov <oleg@redhat.com>]

do/while_each_thread should be avoided when possible.

Plus this change allows to avoid lock_task_sighand(), we can use rcu
and/or sig->stats_lock instead.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 kernel/sys.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 097cbea62a72..67436d465be4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1830,10 +1830,8 @@ void getrusage(struct task_struct *p, int who, struct rusage *r)
 		r->ru_oublock += sig->oublock;
 		if (maxrss < sig->maxrss)
 			maxrss = sig->maxrss;
-		t = p;
-		do {
+		__for_each_thread(sig, t)
 			accumulate_thread_rusage(t, r);
-		} while_each_thread(p, t);
 		break;
 
 	default:
-- 
2.25.1.362.g51ebf55