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epoll: Add synchronous wakeup support for ep_poll_callback

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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>
This commit is contained in:
Xuewen Yan
2024-04-26 16:05:48 +08:00
committed by Christian Brauner
parent 0dfcb72d33
commit 900bbaae67
2 changed files with 5 additions and 1 deletions
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5
fs/eventpoll.c
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@@ -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++;