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From:   Siddh Raman Pant <code@siddh.me>
To:     Eric Biggers <ebiggers@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        David Howells <dhowells@redhat.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
        Eric Dumazet <edumazet@google.com>
Cc:     linux-kernel <linux-kernel@vger.kernel.org>,
        linux-kernel-mentees 
        <linux-kernel-mentees@lists.linuxfoundation.org>
Message-ID: <cover.1659771577.git.code@siddh.me>
Subject: [PATCH v2 0/2] watch_queue: Clean up some code
Date:   Sat,  6 Aug 2022 13:13:40 +0530
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Precedence: bulk

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.

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(-)

--=20
2.35.1