diff options
| author | Paul Gortmaker <paul.gortmaker@windriver.com> | 2013-08-27 18:20:26 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-02-13 22:21:13 (GMT) |
| commit | c8d506dea6b3417d35668818c1476b5080a42670 (patch) | |
| tree | 9ae36c9a69d2fb44cb81db105123cd8081c90b66 /include | |
| parent | f2e61f38c65d5551e72d06329e1c9e951261c12c (diff) | |
| download | linux-fsl-qoriq-c8d506dea6b3417d35668818c1476b5080a42670.tar.xz | |
simple-wait: rename and export the equivalent of waitqueue_active()
The function "swait_head_has_waiters()" was internalized into
wait-simple.c but it parallels the waitqueue_active of normal
waitqueue support. Given that there are over 150 waitqueue_active
users in drivers/ fs/ kernel/ and the like, lets make it globally
visible, and rename it to parallel the waitqueue_active accordingly.
We'll need to do this if we expect to expand its usage beyond RT.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/wait-simple.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/wait-simple.h b/include/linux/wait-simple.h index 4efba4d..f86bca2 100644 --- a/include/linux/wait-simple.h +++ b/include/linux/wait-simple.h @@ -47,6 +47,14 @@ extern void swait_prepare(struct swait_head *head, struct swaiter *w, int state) extern void swait_finish_locked(struct swait_head *head, struct swaiter *w); extern void swait_finish(struct swait_head *head, struct swaiter *w); +/* Check whether a head has waiters enqueued */ +static inline bool swaitqueue_active(struct swait_head *h) +{ + /* Make sure the condition is visible before checking list_empty() */ + smp_mb(); + return !list_empty(&h->list); +} + /* * Wakeup functions */ |