workqueue: Use global variant for add_timer()

The implementation of the NOHZ pull at expiry model will change the timer
bases per CPU. Timers, that have to expire on a specific CPU, require the
TIMER_PINNED flag. If the CPU doesn't matter, the TIMER_PINNED flag must be
dropped. This is required for call sites which use the timer alternately as
pinned and not pinned timer like workqueues do.

Therefore use add_timer_global() in __queue_delayed_work() for non-bound
delayed work to make sure the TIMER_PINNED flag is dropped.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240221090548.36600-7-anna-maria@linutronix.de

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7b482a26d74196c4505d7b45017ed153c75572fd..78eaea2e5d726742d4271b7b75d10784edee0e3f 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1961,7 +1961,7 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
        if (unlikely(cpu != WORK_CPU_UNBOUND))
                add_timer_on(timer, cpu);
        else
-               add_timer(timer);
+               add_timer_global(timer);
 }
 
 /**