sched/completion: Add wait_for_completion_state()

Allows waiting with a custom @state.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20220822114648.922711674@infradead.org

diff --git a/include/linux/completion.h b/include/linux/completion.h
index 51d9ab0..62b32b1 100644 (file)
--- a/include/linux/completion.h
+++ b/include/linux/completion.h
@@ -103,6 +103,7 @@ extern void wait_for_completion(struct completion *);
 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,

diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
index 35f15c2..d57a5c1 100644 (file)
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -204,6 +204,7 @@ EXPORT_SYMBOL(wait_for_completion_io_timeout);
 int __sched wait_for_completion_interruptible(struct completion *x)
 {
        long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_INTERRUPTIBLE);
+
        if (t == -ERESTARTSYS)
                return t;
        return 0;
@@ -241,12 +242,23 @@ EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
 int __sched wait_for_completion_killable(struct completion *x)
 {
        long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_KILLABLE);
+
        if (t == -ERESTARTSYS)
                return t;
        return 0;
 }
 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