linux-kernel - Re: [PATCH] md: fix rcu protection in md_wakeup

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Message-ID: <b7e58c57-12be-47d6-beae-aa70568bfcc4@windriver.com>
Date: Wed, 15 Oct 2025 16:19:33 +0800
From: "Zhou, Yun" <yun.zhou@...driver.com>
To: Yu Kuai <yukuai1@...weicloud.com>, Paul Menzel <pmenzel@...gen.mpg.de>
Cc: agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com, song@...nel.org,
        dm-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] md: fix rcu protection in md_wakeup_thread

Hi Kuai,

On 10/15/25 15:57, Yu Kuai wrote:
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>
> Hi,
>
> 在 2025/10/15 15:31, Zhou, Yun 写道:
>> This method only changes a little code. But it holds the lock before the
>> function jumps, which seems to violate the principle of minimizing the
>> critical area.
>
> use rcu to protect the function is fine, all related code is not from
> IO fast path.
>
> Please also notice this patch is impossible for stable backport because
> of too much modifications.
>
I will make v2 according to your suggestion.

Thanks,
Yun