linux-kernel - Re: [PATCH] x86/cpu: Move identify_cpu_without

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Date: Mon, 10 Jun 2024 16:03:59 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Nikolay Borisov <nik.borisov@...e.com>, x86@...nel.org
Cc: linux-kernel@...r.kernel.org, Nikolay Borisov <nik.borisov@...e.com>
Subject: Re: [PATCH] x86/cpu: Move identify_cpu_without_cpuid() into main
 branch

On Tue, May 21 2024 at 15:48, Nikolay Borisov wrote:
> No point in duplicating if (!have_cpuid_p()) check. Simply move
> identify_cpu_without_cpuid() into the else branch. No functional
> changes.

You wish :)

> Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>
> ---
>  arch/x86/kernel/cpu/common.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 2b170da84f97..69265c0acaea 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -1578,9 +1578,6 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
>  	memset(&c->x86_capability, 0, sizeof(c->x86_capability));
>  	c->extended_cpuid_level = 0;
>  
> -	if (!have_cpuid_p())
> -		identify_cpu_without_cpuid(c);
> -

You might look what identify_cpu_without_cpuid() does and how the
comment right here might be related:

>  	/* cyrix could have cpuid enabled via c_identify()*/
>  	if (have_cpuid_p()) {

Thanks,

        tglx