[PATCH v3 4/6] sched/completion: Add wait_for_completion_state()

[Peter Zijlstra]

Allows waiting with a custom @state.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 include/linux/completion.h |    1 +
 kernel/sched/completion.c  |    9 +++++++++
 2 files changed, 10 insertions(+)

--- a/include/linux/completion.h
+++ b/include/linux/completion.h
@@ -103,6 +103,7 @@ extern void wait_for_completion(struct c
 extern void wait_for_completion_io(struct completion *);
 extern int wait_for_completion_interruptible(struct completion *x);
 extern int wait_for_completion_killable(struct completion *x);
+extern int wait_for_completion_state(struct completion *x, unsigned int state);
 extern unsigned long wait_for_completion_timeout(struct completion *x,
 						   unsigned long timeout);
 extern unsigned long wait_for_completion_io_timeout(struct completion *x,
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -247,6 +247,15 @@ int __sched wait_for_completion_killable
 }
 EXPORT_SYMBOL(wait_for_completion_killable);
 
+int __sched wait_for_completion_state(struct completion *x, unsigned int state)
+{
+	long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, state);
+	if (t == -ERESTARTSYS)
+		return t;
+	return 0;
+}
+EXPORT_SYMBOL(wait_for_completion_state);
+
 /**
  * wait_for_completion_killable_timeout: - waits for completion of a task (w/(to,killable))
  * @x:  holds the state of this particular completion