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

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Message-ID: <20250107162649.GA18886@redhat.com>
Date: Tue, 7 Jan 2025 17:26:49 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Christian Brauner <brauner@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Manfred Spraul <manfred@...orfullife.com>
Cc: "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: [PATCH 0/5] poll_wait: add mb() to fix theoretical race between
 waitqueue_active() and .poll()

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.

Oleg.
---

 include/linux/poll.h | 26 ++++++++++++--------------
 include/net/sock.h   | 17 +++++++----------
 io_uring/io_uring.c  |  9 ++++-----
 3 files changed, 23 insertions(+), 29 deletions(-)