linux-kernel - Re: [PATCH] fs/buffer: adjust the order of might_sleep() in __getblk

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Date:   Fri, 24 Mar 2023 09:52:01 +0800
From:   gouhao@...ontech.com
To:     willy@...radead.org
Cc:     brauner@...nel.org, gouhao@...ontech.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH] fs/buffer: adjust the order of might_sleep() in __getblk_gfp()

>On Thu, Mar 23, 2023 at 05:37:52PM +0800, gouhao@...ontech.com wrote:
>> From: Gou Hao <gouhao@...ontech.com>
>> 
>> If 'bh' is found in cache, just return directly.
>> might_sleep() is only required on slow paths.
>
>You're missing the point.  The caller can't know whether the slow or
>fast path will be taken.  So it must _never_ call this function if it
>cannot sleep.
I see. Thank you for your explanation! :)