diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2024-10-30 08:53:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-12-05 14:01:22 +0100 |
| commit | 1dfa6c520022b72de65e64d845cecde8903d9f63 (patch) | |
| tree | 596cffa4fb027d03cf7b08395e3bc4949c6b18ee | |
| parent | b62a8825d3289c03d1e356f5f38e25081539d58c (diff) | |
timers: Add missing READ_ONCE() in __run_timer_base()
[ Upstream commit 1d4199cbbe95efaba51304cfd844bd0ccd224e61 ]
__run_timer_base() checks base::next_expiry without holding
base::lock. That can race with a remote CPU updating next_expiry under the
lock. This is an intentional and harmless data race, but lacks a
READ_ONCE(), so KCSAN complains about this.
Add the missing READ_ONCE(). All other places are covered already.
Fixes: 79f8b28e85f8 ("timers: Annotate possible non critical data race of next_expiry")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/all/87a5emyqk0.ffs@tglx
Closes: https://lore.kernel.org/oe-lkp/202410301205.ef8e9743-lkp@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | kernel/time/timer.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 0fc9d066a7be..7835f9b376e7 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -2422,7 +2422,8 @@ static inline void __run_timers(struct timer_base *base) static void __run_timer_base(struct timer_base *base) { - if (time_before(jiffies, base->next_expiry)) + /* Can race against a remote CPU updating next_expiry under the lock */ + if (time_before(jiffies, READ_ONCE(base->next_expiry))) return; timer_base_lock_expiry(base); |