From 9a6b06c8d9a220860468aadb2f1c726570813bf9 Mon Sep 17 00:00:00 2001 From: Petr Mladek Date: Tue, 11 Oct 2016 13:55:46 -0700 Subject: kthread: allow to modify delayed kthread work There are situations when we need to modify the delay of a delayed kthread work. For example, when the work depends on an event and the initial delay means a timeout. Then we want to queue the work immediately when the event happens. This patch implements kthread_mod_delayed_work() as inspired workqueues. It cancels the timer, removes the work from any worker list and queues it again with the given timeout. A very special case is when the work is being canceled at the same time. It might happen because of the regular kthread_cancel_delayed_work_sync() or by another kthread_mod_delayed_work(). In this case, we do nothing and let the other operation win. This should not normally happen as the caller is supposed to synchronize these operations a reasonable way. Link: http://lkml.kernel.org/r/1470754545-17632-11-git-send-email-pmladek@suse.com Signed-off-by: Petr Mladek Acked-by: Tejun Heo Cc: Oleg Nesterov Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Steven Rostedt Cc: "Paul E. McKenney" Cc: Josh Triplett Cc: Thomas Gleixner Cc: Jiri Kosina Cc: Borislav Petkov Cc: Michal Hocko Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/kthread.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include') diff --git a/include/linux/kthread.h b/include/linux/kthread.h index 77435dcde707..5c2ec2c4eb22 100644 --- a/include/linux/kthread.h +++ b/include/linux/kthread.h @@ -168,6 +168,10 @@ bool kthread_queue_delayed_work(struct kthread_worker *worker, struct kthread_delayed_work *dwork, unsigned long delay); +bool kthread_mod_delayed_work(struct kthread_worker *worker, + struct kthread_delayed_work *dwork, + unsigned long delay); + void kthread_flush_work(struct kthread_work *work); void kthread_flush_worker(struct kthread_worker *worker); -- cgit v1.2.3