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authorLinus Torvalds <torvalds@linux-foundation.org>2019-10-20 12:25:12 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2019-10-20 12:25:12 +0200
commit188768f3c0727d4cb95eaad6c67799449aebcc03 (patch)
tree95737da57f72083fad834b3573935475407b17bb /kernel
parentMerge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ke... (diff)
parenthrtimer: Annotate lockless access to timer->base (diff)
downloadlinux-188768f3c0727d4cb95eaad6c67799449aebcc03.tar.xz
linux-188768f3c0727d4cb95eaad6c67799449aebcc03.zip
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull hrtimer fixlet from Thomas Gleixner: "A single commit annotating the lockcless access to timer->base with READ_ONCE() and adding the WRITE_ONCE() counterparts for completeness" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: hrtimer: Annotate lockless access to timer->base
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/hrtimer.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 0d4dc241c0fb..65605530ee34 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -164,7 +164,7 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
struct hrtimer_clock_base *base;
for (;;) {
- base = timer->base;
+ base = READ_ONCE(timer->base);
if (likely(base != &migration_base)) {
raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);
if (likely(base == timer->base))
@@ -244,7 +244,7 @@ again:
return base;
/* See the comment in lock_hrtimer_base() */
- timer->base = &migration_base;
+ WRITE_ONCE(timer->base, &migration_base);
raw_spin_unlock(&base->cpu_base->lock);
raw_spin_lock(&new_base->cpu_base->lock);
@@ -253,10 +253,10 @@ again:
raw_spin_unlock(&new_base->cpu_base->lock);
raw_spin_lock(&base->cpu_base->lock);
new_cpu_base = this_cpu_base;
- timer->base = base;
+ WRITE_ONCE(timer->base, base);
goto again;
}
- timer->base = new_base;
+ WRITE_ONCE(timer->base, new_base);
} else {
if (new_cpu_base != this_cpu_base &&
hrtimer_check_target(timer, new_base)) {