linux-kernel - Re: [PATCH v1 1/1] sched/fair: Mark cfs_bandwidth_used() and m*_vruntime() with __maybe

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Message-ID: <Zy3aU4g-lBim39CS@smile.fi.intel.com>
Date: Fri, 8 Nov 2024 11:30:59 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>
Subject: Re: [PATCH v1 1/1] sched/fair: Mark cfs_bandwidth_used() and
 m*_vruntime() with __maybe_unused

On Thu, Sep 05, 2024 at 08:12:10PM +0300, Andy Shevchenko wrote:
> When cfs_bandwidth_used() is unused, it prevents kernel builds
> with clang, `make W=1` and CONFIG_WERROR=y:
> 
> kernel/sched/fair.c:526:19: error: unused function 'max_vruntime' [-Werror,-Wunused-function]
>   526 | static inline u64 max_vruntime(u64 max_vruntime, u64 vruntime)
>       |                   ^~~~~~~~~~~~
> kernel/sched/fair.c:6580:20: error: unused function 'cfs_bandwidth_used' [-Werror,-Wunused-function]
>  6580 | static inline bool cfs_bandwidth_used(void)
>       |                    ^~~~~~~~~~~~~~~~~~
> 
> Fix this by marking them with __maybe_unused (all cases for the sake of
> symmetry).
> 
> See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
> inline functions for W=1 build").

Any comments on this? Can it be eventually applied, please?

-- 
With Best Regards,
Andy Shevchenko