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authorPetr Mladek <pmladek@suse.com>2016-10-11 13:55:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-11 15:06:33 -0700
commit9a6b06c8d9a220860468aadb2f1c726570813bf9 (patch)
tree4bed10bb36fdb1f0b0cbfd97a00a85a4f02db80b /include
parent37be45d49dec2a411e29d50c9597cfe8184b5645 (diff)
downloadlinux-9a6b06c8d9a220860468aadb2f1c726570813bf9.tar.bz2
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 <pmladek@suse.com> Acked-by: Tejun Heo <tj@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Borislav Petkov <bp@suse.de> Cc: Michal Hocko <mhocko@suse.cz> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kthread.h4
1 files changed, 4 insertions, 0 deletions
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);