netdev - Re: [PATCH 0/5] poll_wait: add mb() to fix theoretical race between waitqueue

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Message-ID: <20250110-respekt-mausklick-176ab50a5b7e@brauner>
Date: Fri, 10 Jan 2025 12:00:53 +0100
From: Christian Brauner <brauner@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
	Manfred Spraul <manfred@...orfullife.com>,
	Oleg Nesterov <oleg@...hat.com>
Cc: Christian Brauner <brauner@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	WangYuli <wangyuli@...ontech.com>,
	linux-kernel@...r.kernel.org,
	io-uring@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 0/5] poll_wait: add mb() to fix theoretical race between waitqueue_active() and .poll()

On Tue, 07 Jan 2025 17:26:49 +0100, Oleg Nesterov wrote:
> Linus,
> 
> I misread fs/eventpoll.c, it has the same problem. And more __pollwait()-like
> functions, for example p9_pollwait(). So 1/5 adds mb() into poll_wait(), not
> into __pollwait().
> 
> WangYuli, after 1/5 we can reconsider your patch.
> 
> [...]

Applied to the vfs-6.14.poll branch of the vfs/vfs.git tree.
Patches in the vfs-6.14.poll branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-6.14.poll

[1/5] poll_wait: add mb() to fix theoretical race between waitqueue_active() and .poll()
      https://git.kernel.org/vfs/vfs/c/cacd9ae4bf80
[2/5] poll_wait: kill the obsolete wait_address check
      https://git.kernel.org/vfs/vfs/c/10b02a2cfec2
[3/5] io_uring_poll: kill the no longer necessary barrier after poll_wait()
      https://git.kernel.org/vfs/vfs/c/4e15fa8305de
[4/5] sock_poll_wait: kill the no longer necessary barrier after poll_wait()
      https://git.kernel.org/vfs/vfs/c/b2849867b3a7
[5/5] poll: kill poll_does_not_wait()
      https://git.kernel.org/vfs/vfs/c/f005bf18a57a