From: Uros Bizjak <ubizjak@gmail.com>
Date: Tue, 28 Feb 2023 16:14:26 +0000 (+0100)
Subject: sched/core: Use do-while instead of for loop in set_nr_if_polling()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4ff34ad3d39377d9f6953f3606ccf611ce636767;p=linux.git

sched/core: Use do-while instead of for loop in set_nr_if_polling()

Use equivalent do-while loop instead of infinite for loop.

There are no asm code changes.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230228161426.4508-1-ubizjak@gmail.com
---

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 76662d809183b..f39482d6a6e69 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -919,14 +919,13 @@ static bool set_nr_if_polling(struct task_struct *p)
 	struct thread_info *ti = task_thread_info(p);
 	typeof(ti->flags) val = READ_ONCE(ti->flags);
 
-	for (;;) {
+	do {
 		if (!(val & _TIF_POLLING_NRFLAG))
 			return false;
 		if (val & _TIF_NEED_RESCHED)
 			return true;
-		if (try_cmpxchg(&ti->flags, &val, val | _TIF_NEED_RESCHED))
-			break;
-	}
+	} while (!try_cmpxchg(&ti->flags, &val, val | _TIF_NEED_RESCHED));
+
 	return true;
 }