linux-kernel - [PATCH] [RFC] sched/core: avoid checking in_atomic_preempt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230825023501.1848-1-liming.wu@jaguarmicro.com>
Date:   Fri, 25 Aug 2023 10:35:00 +0800
From:   liming.wu@...uarmicro.com
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, brauner@...nel.org,
        linux-kernel@...r.kernel.org, 398776277@...com
Cc:     Liming Wu <liming.wu@...uarmicro.com>
Subject: [PATCH] [RFC] sched/core: avoid checking in_atomic_preempt_off twice

From: Liming Wu <liming.wu@...uarmicro.com>

in_atomic_preempt_off is checked twice in schedule_debug, and
__schedule_bug only called in schedule_debug. remove the redundant
in_atomic_preempt_off check in __schedule_bug.

Signed-off-by: Liming Wu <liming.wu@...uarmicro.com>
---
 kernel/sched/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a68d1276bab0..ae44958b3851 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5884,8 +5884,7 @@ static noinline void __schedule_bug(struct task_struct *prev)
 	print_modules();
 	if (irqs_disabled())
 		print_irqtrace_events(prev);
-	if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)
-	    && in_atomic_preempt_off()) {
+	if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) {
 		pr_err("Preemption disabled at:");
 		print_ip_sym(KERN_ERR, preempt_disable_ip);
 	}
-- 
2.25.1