[patch 002/155] kthread: mark timer used by delayed kthread works as IRQ safe

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From: Petr Mladek <pmladek@xxxxxxxx>
Subject: kthread: mark timer used by delayed kthread works as IRQ safe

The timer used by delayed kthread works are IRQ safe because the used
kthread_delayed_work_timer_fn() is IRQ safe.

It is properly marked when initialized by KTHREAD_DELAYED_WORK_INIT(). 
But TIMER_IRQSAFE flag is missing when initialized by
kthread_init_delayed_work().

The missing flag might trigger invalid warning from del_timer_sync() when
kthread_mod_delayed_work() is called with interrupts disabled.

This patch is result of a discussion about using the API, see
https://lkml.kernel.org/r/cfa886ad-e3b7-c0d2-3ff8-58d94170eab5@xxxxxx

Link: http://lkml.kernel.org/r/20200217120709.1974-1-pmladek@xxxxxxxx
Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Reported-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
Tested-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 include/linux/kthread.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/linux/kthread.h~kthread-mark-timer-used-by-delayed-kthread-works-as-irq-safe
+++ a/include/linux/kthread.h
@@ -165,7 +165,8 @@ extern void __kthread_init_worker(struct
 	do {								\
 		kthread_init_work(&(dwork)->work, (fn));		\
 		timer_setup(&(dwork)->timer,				\
-			     kthread_delayed_work_timer_fn, 0);		\
+			     kthread_delayed_work_timer_fn,		\
+			     TIMER_IRQSAFE);				\
 	} while (0)
 
 int kthread_worker_fn(void *worker_ptr);
_




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