lkml.org 
[lkml]   [2021]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 01/11] sched: Trigger warning if ->migration_disabled counter underflows.
Date
If migrate_enable() is used more often than its counter part then it
remains undetected and rq::nr_pinned will underflow, too.

Add a warning if migrate_enable() is attempted if without a matching a
migrate_disable().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/sched/core.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 76f9deeaa9420..02be3f6144e97 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2171,6 +2171,8 @@ void migrate_enable(void)
if (p->migration_disabled > 1) {
p->migration_disabled--;
return;
+ } else if (WARN_ON_ONCE(p->migration_disabled == 0)) {
+ return;
}

/*
--
2.34.0
\
 
 \ /
  Last update: 2021-11-29 23:45    [W:0.251 / U:0.976 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site