linux-kernel - Re: [RESEND PATCH v2 0/2] watch

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Message-ID: <6a22e287-9d90-85a9-f5e6-49e600bf0d80@siddh.me>
Date:   Mon, 28 Nov 2022 16:06:44 +0530
From:   Siddh Raman Pant <code@...dh.me>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        keyrings <keyrings@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [RESEND PATCH v2 0/2] watch_queue: Clean up some code

On Sat, 12 Nov 2022 16:00:39 +0530, Siddh Raman Pant wrote:
> There is a dangling reference to pipe in a watch_queue after clearing it.
> Thus, NULL that pointer while clearing.
> 
> This change renders wqueue->defunct superfluous, as the latter is only used
> to check if watch_queue is cleared. With this change, the pipe is NULLed
> while clearing, so we can just check if the pipe is NULL.
> 
> Extending comment for watch_queue->pipe in the definition of watch_queue
> made the comment conventionally too long (it was already past 80 chars),
> so I have changed the struct annotations to be kerneldoc-styled, so that
> I can extend the comment mentioning that the pipe is NULL when watch_queue
> is cleared. In the process, I have also hopefully improved documentation
> by documenting things which weren't documented before.
> 
> Changes in v2:
> - Merged the NULLing and removing defunct patches.
> - Removed READ_ONCE barrier in lock_wqueue().
> - Improved and fixed errors in struct docs.
> - Better commit messages.
> 
> Original date of posting patch: 6 Aug 2022
> 
> Siddh Raman Pant (2):
>   include/linux/watch_queue: Improve documentation
>   kernel/watch_queue: NULL the dangling *pipe, and use it for clear
>     check
> 
>  include/linux/watch_queue.h | 100 ++++++++++++++++++++++++++----------
>  kernel/watch_queue.c        |  12 ++---
>  2 files changed, 79 insertions(+), 33 deletions(-)
> 

Hi,

Please review the quoted patches, which can be found on:
https://lore.kernel.org/all/cover.1668248462.git.code@siddh.me/

Please let me know if any changes are required.

Thanks,
Siddh