From: John Ogness <john.ogness@linutronix.de>
To: Zhu Jun <zhujun2@cmss.chinamobile.com>, pmladek@suse.com
Cc: rostedt@goodmis.org, senozhatsky@chromium.org,
paulmck@kernel.org, printk@lists.linux.dev,
linux-kernel@vger.kernel.org, zhujun2@cmss.chinamobile.com
Subject: Re: [PATCH v3] printk: ringbuffer: Annotate speculative record reads
Date: Fri, 13 Nov 2026 13:13:48 +0106 [thread overview]
Message-ID: <87tsllvsrv.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <20261113075039.172176-1-zhujun2@cmss.chinamobile.com>
On 2026-11-13, Zhu Jun <zhujun2@cmss.chinamobile.com> wrote:
> Readers may copy a finalized record while a writer recycles its storage.
> prb_read() checks the descriptor again after copying and rejects records
> that have changed, but the plain metadata and text accesses still trigger
> KCSAN reports.
>
> Annotate the speculative copies, line counting and length read with
> data_race(). The descriptor validation continues to determine whether
> the copied record can be used.
>
> Fixes: b6cf8b3f3312 ("printk: add lockless ringbuffer")
> Signed-off-by: Zhu Jun <zhujun2@cmss.chinamobile.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Thanks!
prev parent reply other threads:[~2026-11-13 12:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-13 7:50 [PATCH v3] printk: ringbuffer: Annotate speculative record reads Zhu Jun
2026-11-13 12:07 ` John Ogness [this message]
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