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

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Date: Mon, 10 Jun 2024 09:59:07 +0300
From: Nikolay Borisov <nik.borisov@...e.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/cpu: Move identify_cpu_without_cpuid() into main
 branch



On 21.05.24 г. 15:48 ч., 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.
> 
> Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>

ping

> ---
>   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);
> -
>   	/* cyrix could have cpuid enabled via c_identify()*/
>   	if (have_cpuid_p()) {
>   		cpu_detect(c);
> @@ -1601,6 +1598,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
>   		if (this_cpu->c_bsp_init)
>   			this_cpu->c_bsp_init(c);
>   	} else {
> +		identify_cpu_without_cpuid(c);
>   		setup_clear_cpu_cap(X86_FEATURE_CPUID);
>   		get_cpu_address_sizes(c);
>   		cpu_init_topology(c);