linux-kernel - Re: [PATCH] rwonce: handle KCSAN like KASAN in read_word_at_a

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Message-Id: <26df580c-b2cc-4bb0-b15b-4e9b74897ff0@app.fastmail.com>
Date: Tue, 25 Mar 2025 17:05:55 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Jann Horn" <jannh@...gle.com>, "Marco Elver" <elver@...gle.com>,
 "Dmitry Vyukov" <dvyukov@...gle.com>
Cc: kasan-dev@...glegroups.com, Linux-Arch <linux-arch@...r.kernel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rwonce: handle KCSAN like KASAN in read_word_at_a_time()

On Tue, Mar 25, 2025, at 17:01, Jann Horn wrote:
> Fixes: dfd402a4c4ba ("kcsan: Add Kernel Concurrency Sanitizer infrastructure")
> Signed-off-by: Jann Horn <jannh@...gle.com>

Acked-by: Arnd Bergmann <arnd@...db.de>

> ---
> This is a low-priority fix. I've never actually hit this issue with
> upstream KCSAN.
> (I only noticed it because I... err... hooked up KASAN to the KCSAN
> hooks. Long story.)
>
> I'm not sure if this should go through Arnd's tree (because it's in
> rwonce.h) or Marco's (because it's a KCSAN thing).
> Going through Marco's tree (after getting an Ack from Arnd) might
> work a little better for me, I may or may not have more KCSAN patches
> in the future.

I agree it's easier if Marco takes it through his tree, as this
is something I rarely touch.

If Marco has nothing else pending for 6.15, I can take it though.

       Arnd