From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
"Rafael J. Wysocki" <rafael@kernel.org>,
David Laight <David.Laight@aculab.com>
Subject: Re: [PATCH 1/1] linux/container_of.h: Warn about loss of constness
Date: Mon, 24 Oct 2022 12:22:56 +0300 [thread overview]
Message-ID: <Y1ZZcL/Q7QJ+YYhJ@smile.fi.intel.com> (raw)
In-Reply-To: <Y1ZW2WYli7Bfioxr@paasikivi.fi.intel.com>
On Mon, Oct 24, 2022 at 09:11:53AM +0000, Sakari Ailus wrote:
> On Mon, Oct 24, 2022 at 10:45:25AM +0200, Greg Kroah-Hartman wrote:
> > On Mon, Oct 24, 2022 at 10:43:52AM +0200, Greg Kroah-Hartman wrote:
...
> > Wait, no one uses this macro, so why not just remove it entirely?
>
> Good question. It appears to be a (relatively) common pattern to look up
> something and the return its containing object if the lookup was
> successful. Doing a quick
>
> $ git grep 'container_of.*:' drivers include
>
> reveals more than 20 instances of the pattern. There are probably more
> those that use if for testing for NULL. I guess people don't know about
> this macro, apart from the developers of the staging driver it was added
> for (commit 05e6557b8ed833546ee2b66ce6b58fecf09f439e).
Maybe we can provide an example to keep this macro in the kernel, meaning
convert one of the drivers / subsystem to actually use it?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-10-24 9:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-24 8:26 [PATCH 1/1] linux/container_of.h: Warn about loss of constness Sakari Ailus
2022-10-24 8:43 ` Greg Kroah-Hartman
2022-10-24 8:45 ` Greg Kroah-Hartman
2022-10-24 9:00 ` Andy Shevchenko
2022-10-24 17:39 ` Kees Cook
2022-10-24 17:51 ` Rafael J. Wysocki
2022-10-24 21:24 ` David Laight
2022-10-25 7:47 ` Greg Kroah-Hartman
2022-10-24 9:11 ` Sakari Ailus
2022-10-24 9:22 ` Andy Shevchenko [this message]
2022-10-24 9:34 ` David Laight
2022-10-24 9:37 ` 'Andy Shevchenko'
2022-10-24 9:46 ` David Laight
2022-10-24 10:01 ` Greg Kroah-Hartman
2022-10-24 10:05 ` David Laight
2022-10-24 9:48 ` Greg Kroah-Hartman
2022-10-24 10:07 ` Sakari Ailus
2022-10-24 8:59 ` David Laight
2022-10-24 10:11 ` Sakari Ailus
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