linux-kernel - Re: [PATCH v1 1/1] x86/cpu: Mark flag_is_changeable_p() with __maybe

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Message-ID: <Ztnj40_A18uWiwU4@smile.fi.intel.com>
Date: Thu, 5 Sep 2024 20:01:23 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Cc: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.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] x86/cpu: Mark flag_is_changeable_p() with
 __maybe_unused

On Thu, Sep 05, 2024 at 07:58:58PM +0300, Andy Shevchenko wrote:
> When flag_is_changeable_p() is unused, it prevents kernel builds
> with clang, `make W=1` and CONFIG_WERROR=y:
> 
> arch/x86/kernel/cpu/common.c:351:19: error: unused function 'flag_is_changeable_p' [-Werror,-Wunused-function]
>   351 | static inline int flag_is_changeable_p(u32 flag)
>       |                   ^~~~~~~~~~~~~~~~~~~~
> 
> Fix this by marking it with __maybe_unused.
> 
> See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
> inline functions for W=1 build").

...and it should be done for 64-bit case.

-- 
With Best Regards,
Andy Shevchenko