From: Wen Yang Date: Thu, 4 May 2023 16:12:53 +0000 (+0800) Subject: tick/rcu: Fix bogus ratelimit condition X-Git-Tag: v6.3.13~391 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=14c05764241cf4c66ff7462cb2617e82bb1cce58;p=thirdparty%2Fkernel%2Fstable.git tick/rcu: Fix bogus ratelimit condition [ Upstream commit a7e282c77785c7eabf98836431b1f029481085ad ] The ratelimit logic in report_idle_softirq() is broken because the exit condition is always true: static int ratelimit; if (ratelimit < 10) return false; ---> always returns here ratelimit++; ---> no chance to run Make it check for >= 10 instead. Fixes: 0345691b24c0 ("tick/rcu: Stop allowing RCU_SOFTIRQ in idle") Signed-off-by: Wen Yang Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/tencent_5AAA3EEAB42095C9B7740BE62FBF9A67E007@qq.com Signed-off-by: Sasha Levin --- diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index d6fb6a676bbbb..1ad89eec2a55f 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -1046,7 +1046,7 @@ static bool report_idle_softirq(void) return false; } - if (ratelimit < 10) + if (ratelimit >= 10) return false; /* On RT, softirqs handling may be waiting on some lock */