linux-kernel - Re: [PATCH] kernel/watch_queue: Make pipe NULL while clearing watch

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Date:   Sun, 24 Jul 2022 09:45:27 +0600
From:   Khalid Masum <khalid.masum.92@...il.com>
To:     Siddh Raman Pant <code@...dh.me>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        "syzbot+c70d87ac1d001f29a058" 
        <syzbot+c70d87ac1d001f29a058@...kaller.appspotmail.com>,
        linux-kernel-mentees 
        <linux-kernel-mentees@...ts.linuxfoundation.org>,
        linux-security-modules <linux-security-module@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: Re: [PATCH] kernel/watch_queue: Make pipe NULL while clearing watch_queue

On Sat, Jul 23, 2022 at 8:29 PM Siddh Raman Pant via
Linux-kernel-mentees <linux-kernel-mentees@...ts.linuxfoundation.org>
wrote:
>
> On Sat, 23 Jul 2022 19:33:33 +0530  Greg KH <gregkh@...uxfoundation.org> wrote:
> > You should not use #ifdef in .c files, it's unmaintainable over time.
> >
> > thanks,
> >
> > greg k-h
> >
>
> I used it because it is used in the same way in fs/pipe.c too (please check the
> stated line number).
>
> That, in turn, is because `watch_queue` member in the `pipe_inode_info` struct
> is defined that way (see line 80 of include/linux/pipe_fs_i.h), so I am forced
> to use the ifdef guard.
>
Maybe, we can use the IS_ENABLED macro here to avoid ifdef in the .c file as
suggested here:
https://www.kernel.org/doc/html/v4.10/process/coding-style.html#conditional-compilation

if(IS_ENABLED(CONFIG_WATCH_QUEUE)){
     ...
}

> Thanks,
> Siddh

Thanks,
  -- Khalid Masum