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[ Upstream commit 900bbaae67e980945dec74d36f8afe0de7556d5a ] 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> [ Redefine wake_up_sync(x) as __wake_up_sync(x, TASK_NORMAL, 1) to make it work on 5.4.y ] Signed-off-by: Wenshan Lan <jetlan9@163.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.