linux-kernel - Re: [PATCH v4 0/1] eventpoll: Fix priority inversion problem

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Message-ID: <20250905-weltoffen-eintopf-551fba944be9@brauner>
Date: Fri,  5 Sep 2025 15:52:14 +0200
From: Christian Brauner <brauner@...nel.org>
To: Nam Cao <namcao@...utronix.de>
Cc: Christian Brauner <brauner@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Xi Ruoyao <xry111@...111.site>,
	Frederic Weisbecker <frederic@...nel.org>,
	Valentin Schneider <vschneid@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Ogness <john.ogness@...utronix.de>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev,
	linux-rt-users@...r.kernel.org,
	Joe Damato <jdamato@...tly.com>,
	Martin Karsten <mkarsten@...terloo.ca>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v4 0/1] eventpoll: Fix priority inversion problem

On Tue, 15 Jul 2025 14:46:33 +0200, Nam Cao wrote:
> This v4 is the follow-up to v3 at:
> https://lore.kernel.org/linux-fsdevel/20250527090836.1290532-1-namcao@linutronix.de/
> which resolves a priority inversion problem.
> 
> The v3 patch was merged, but then got reverted due to regression.
> 
> The direction of v3 was wrong in the first place. It changed the
> eventpoll's event list to be lockless, making the code harder to read. I
> stared at the patch again, but still couldn't figure out what the bug is.
> 
> [...]

Applied to the vfs-6.18.misc branch of the vfs/vfs.git tree.
Patches in the vfs-6.18.misc 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-6.18.misc

[1/1] eventpoll: Replace rwlock with spinlock
      https://git.kernel.org/vfs/vfs/c/0c43094f8cc9