[RFC PATCH 02/21] Add a prelocked wake-up
From: David Howells <dhowells@redhat.com>
Date: 2019-10-15 21:48:18
Also in:
keyrings, linux-api, linux-block, linux-fsdevel, linux-usb, lkml
Subsystem:
scheduler, the rest · Maintainers:
Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
Add a wakeup call for a case whereby the caller already has the waitqueue spinlock held. This can be used by pipes to alter the ring buffer indices under the spinlock. Signed-off-by: David Howells <dhowells@redhat.com> --- include/linux/wait.h | 2 ++ kernel/sched/wait.c | 7 +++++++ 2 files changed, 9 insertions(+)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 3eb7cae8206c..d511b298a20c 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h@@ -229,6 +229,8 @@ void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr); __wake_up(x, TASK_INTERRUPTIBLE, 1, poll_to_key(m)) #define wake_up_interruptible_sync_poll(x, m) \ __wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, poll_to_key(m)) +void prelocked_wake_up_interruptible_sync_poll(struct wait_queue_head *wq_head, + __poll_t mask); #define ___wait_cond_timeout(condition) \ ({ \
diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index c1e566a114ca..43fbbbe9af27 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c@@ -126,6 +126,13 @@ static void __wake_up_common_lock(struct wait_queue_head *wq_head, unsigned int } while (bookmark.flags & WQ_FLAG_BOOKMARK); } +void prelocked_wake_up_interruptible_sync_poll(struct wait_queue_head *wq_head, + __poll_t mask) +{ + __wake_up_common(wq_head, TASK_INTERRUPTIBLE, 1, WF_SYNC, + poll_to_key(mask), NULL); +} + /** * __wake_up - wake up threads blocked on a waitqueue. * @wq_head: the waitqueue