From: Oleg Nesterov <oleg@redhat.com>
Date: Sat, 7 Nov 2015 00:32:34 +0000 (-0800)
Subject: coredump: change zap_threads() and zap_process() to use for_each_thread()
X-Git-Tag: v4.9.8~3239^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d61ba58953fcf708c850bfd90b2858f2ddfbc34c;p=platform%2Fkernel%2Flinux-rpi3.git

coredump: change zap_threads() and zap_process() to use for_each_thread()

Change zap_threads() paths to use for_each_thread() rather than
while_each_thread().

While at it, change zap_threads() to avoid the nested if's to make the
code more readable and lessen the indentation.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Kyle Walker <kwalker@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Stanislav Kozina <skozina@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/coredump.c b/fs/coredump.c
index c66bb05..1777331 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -290,15 +290,14 @@ static int zap_process(struct task_struct *start, int exit_code, int flags)
 	start->signal->group_exit_code = exit_code;
 	start->signal->group_stop_count = 0;
 
-	t = start;
-	do {
+	for_each_thread(start, t) {
 		task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
 		if (t != current && t->mm) {
 			sigaddset(&t->pending.signal, SIGKILL);
 			signal_wake_up(t, 1);
 			nr++;
 		}
-	} while_each_thread(start, t);
+	}
 
 	return nr;
 }
@@ -360,18 +359,18 @@ static int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
 			continue;
 		if (g->flags & PF_KTHREAD)
 			continue;
-		p = g;
-		do {
-			if (p->mm) {
-				if (unlikely(p->mm == mm)) {
-					lock_task_sighand(p, &flags);
-					nr += zap_process(p, exit_code,
-							  SIGNAL_GROUP_EXIT);
-					unlock_task_sighand(p, &flags);
-				}
-				break;
+
+		for_each_thread(g, p) {
+			if (unlikely(!p->mm))
+				continue;
+			if (unlikely(p->mm == mm)) {
+				lock_task_sighand(p, &flags);
+				nr += zap_process(p, exit_code,
+							SIGNAL_GROUP_EXIT);
+				unlock_task_sighand(p, &flags);
 			}
-		} while_each_thread(g, p);
+			break;
+		}
 	}
 	rcu_read_unlock();
 done: