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| author | Xuewen Yan <xuewen.yan@unisoc.com> | 2024-04-26 16:05:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-12-27 14:02:20 +0100 |
| commit | 2d129beb8dd49f12d23f27ecc92cdf544d1e9472 (patch) | |
| tree | 920f96c4197ff229c9a8940c0ba7456dc34adc6a /fs/eventpoll.c | |
| parent | a086c8d7f2797c23434baaa4aae0a6bae5dc3414 (diff) | |
| download | linux-2d129beb8dd49f12d23f27ecc92cdf544d1e9472.tar.gz linux-2d129beb8dd49f12d23f27ecc92cdf544d1e9472.tar.bz2 linux-2d129beb8dd49f12d23f27ecc92cdf544d1e9472.zip | |
epoll: Add synchronous wakeup support for ep_poll_callback
commit 900bbaae67e980945dec74d36f8afe0de7556d5a upstream.
Now, the epoll only use wake_up() interface to wake up task.
However, sometimes, there are epoll users which want to use
the synchronous wakeup flag to hint the scheduler, such as
Android binder driver.
So add a wake_up_sync() define, and use the wake_up_sync()
when the sync is true in ep_poll_callback().
Co-developed-by: Jing Xia <jing.xia@unisoc.com>
Signed-off-by: Jing Xia <jing.xia@unisoc.com>
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
Link: https://lore.kernel.org/r/20240426080548.8203-1-xuewen.yan@unisoc.com
Tested-by: Brian Geffon <bgeffon@google.com>
Reviewed-by: Brian Geffon <bgeffon@google.com>
Reported-by: Benoit Lize <lizeb@google.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Cc: Brian Geffon <bgeffon@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/eventpoll.c')
| -rw-r--r-- | fs/eventpoll.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 90fbab6b6f03..1a06e462b6ef 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1373,7 +1373,10 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v break; } } - wake_up(&ep->wq); + if (sync) + wake_up_sync(&ep->wq); + else + wake_up(&ep->wq); } if (waitqueue_active(&ep->poll_wait)) pwake++; |