linux-kernel - Re: [PATCH] string.h: Mark 34 functions with __must

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Message-ID: <4d890cae9cbbd873096cb1fadb477cf4632ddb9a.camel@perches.com>
Date:   Wed, 09 Oct 2019 09:38:33 -0700
From:   Joe Perches <joe@...ches.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        kernel-janitors@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] string.h: Mark 34 functions with __must_check

On Wed, 2019-10-09 at 09:13 -0700, Nick Desaulniers wrote:
> On Wed, Oct 9, 2019 at 8:09 AM Steven Rostedt <rostedt@...dmis.org> wrote:
> > On Wed, 9 Oct 2019 14:14:28 +0200 Markus Elfring <Markus.Elfring@....de> wrote:
[]
> > > Several functions return values with which useful data processing
> > > should be performed. These values must not be ignored then.
> > > Thus use the annotation “__must_check” in the shown function declarations.
[]
> > I'm curious. How many warnings showed up when you applied this patch?
> 
> I got zero for x86_64 and arm64 defconfig builds of linux-next with
> this applied.  Hopefully that's not an argument against the more
> liberal application of it?  I view __must_check as a good thing, and
> encourage its application, unless someone can show that a certain
> function would be useful to call without it.

stylistic trivia, neither agreeing nor disagreeing with the patch
as I generally avoid reading Markus' patches.

I believe __must_check is best placed before the return type as
that makes grep for function return type easier to parse.

i.e. prefer
	[static inline] __must_check <type> <function>(<args...>);
over
	[static inline] <type> __must_check <function>(<args...>);