linux-kernel - Re: [PATCH] x86/cpu: remove needless definition for !CONFIG_X86

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Date:   Mon, 16 Nov 2020 07:27:11 -0800
From:   Tom Rix <trix@...hat.com>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/cpu: remove needless definition for !CONFIG_X86_32


On 11/16/20 1:42 AM, Lukas Bulwahn wrote:
> The function flag_is_changeable_p() is used in:
>
>   - have_cpuid_p() for its CONFIG_X86_32 definition
>   - identify_cpu_without_cpuid() within its CONFIG_X86_32 ifdef-block

This looks fine.

Reviewed-by: Tom Rix <trix@...hat.com>

a bit of cleanup, identify_cpu_without_cpuid() be moved into the main CONFIG_X86_32 ifdef with stub for x86_64.

>
> So, there is no need to define flag_is_changeable_p() if !CONFIG_X86_32.
> Simply remove this needless definition.
>
> This was discovered with make CC=clang W=1:
>
>   arch/x86/kernel/cpu/common.c:283:19:
>     warning: unused function 'flag_is_changeable_p' [-Wunused-function]
>
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> ---
> applies cleanly on current master and next-20201116
>
> Thomas, Boris, please pick this minor non-urgent patch.
>
>  arch/x86/kernel/cpu/common.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 35ad8480c464..b89dbc7ccb0c 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -280,10 +280,6 @@ static int __init x86_serial_nr_setup(char *s)
>  }
>  __setup("serialnumber", x86_serial_nr_setup);
>  #else
> -static inline int flag_is_changeable_p(u32 flag)
> -{
> -	return 1;
> -}
>  static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
>  {
>  }