linux-kernel - Re: [PATCH v1 3/3] kernel.h: Split out container_of() and typeof

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Message-ID: <YO1s+rHEqC9RjMva@kroah.com>
Date:   Tue, 13 Jul 2021 12:37:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-media@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Thomas Graf <tgraf@...g.ch>,
        Andrew Morton <akpm@...ux-foundation.org>, jic23@...nel.org,
        linux@...musvillemoes.dk
Subject: Re: [PATCH v1 3/3] kernel.h: Split out container_of() and
 typeof_memeber() macros

On Tue, Jul 13, 2021 at 11:45:41AM +0300, Andy Shevchenko wrote:
> kernel.h is being used as a dump for all kinds of stuff for a long time.
> Here is the attempt cleaning it up by splitting out container_of() and
> typeof_memeber() macros.

That feels messy, why?  Reading one .h file for these common
macros/defines is fine, why are container_of and typeof somehow
deserving of their own .h files?  What speedups are you seeing by
splitting this up?

> At the same time convert users in the header and other folders to use it.
> Though for time being include new header back to kernel.h to avoid twisted
> indirected includes for existing users.
> 
> Note, there are _a lot_ of headers and modules that include kernel.h solely
> for one of these macros and this allows to unburden compiler for the twisted
> inclusion paths and to make new code cleaner in the future.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  include/kunit/test.h         | 14 ++++++++++++--
>  include/linux/container_of.h | 37 ++++++++++++++++++++++++++++++++++++
>  include/linux/kernel.h       | 31 +-----------------------------
>  include/linux/kobject.h      | 14 +++++++-------

Why are all of these changes needed to kobject.h for this one change?
This diff:

> --- a/include/linux/kobject.h
> +++ b/include/linux/kobject.h
> @@ -15,18 +15,18 @@
>  #ifndef _KOBJECT_H_
>  #define _KOBJECT_H_
>  
> -#include <linux/types.h>
> -#include <linux/list.h>
> -#include <linux/sysfs.h>
> +#include <linux/atomic.h>
>  #include <linux/compiler.h>
> -#include <linux/spinlock.h>
> +#include <linux/container_of.h>
> +#include <linux/list.h>
>  #include <linux/kref.h>
>  #include <linux/kobject_ns.h>
> -#include <linux/kernel.h>
>  #include <linux/wait.h>
> -#include <linux/atomic.h>
> -#include <linux/workqueue.h>
> +#include <linux/spinlock.h>
> +#include <linux/sysfs.h>
> +#include <linux/types.h>
>  #include <linux/uidgid.h>
> +#include <linux/workqueue.h>

Is a lot more changes than the "split the macros out" deserves.

Please make this a separate change, remember to only do one thing at a
time (this patch is at least 2 changes...)

so NAK, this change isn't ok as-is.

greg k-h