linux-kernel - Re: [PATCH v5 04/12] x86/apic: Move logical APIC ID away from apic_bsp

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Date:   Sun, 2 Jul 2017 19:54:51 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dou Liyang <douly.fnst@...fujitsu.com>
cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, mingo@...nel.org, hpa@...or.com,
        ebiederm@...ssion.com, bhe@...hat.com, boris.ostrovsky@...cle.com,
        peterz@...radead.org, izumi.taku@...fujitsu.com
Subject: Re: [PATCH v5 04/12] x86/apic: Move logical APIC ID away from
 apic_bsp_setup()

On Fri, 30 Jun 2017, Dou Liyang wrote:
>  /*
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 93f0cda..d6721f0 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -1347,8 +1347,11 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
>  	}
>  
>  	default_setup_apic_routing();
> -	cpu0_logical_apicid = apic_bsp_setup(false);
> -
> +	apic_bsp_setup(false);
> +	if (x2apic_mode)
> +		cpu0_logical_apicid = apic_read(APIC_LDR);
> +	else
> +		cpu0_logical_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));

Can you please move that into a seperate helper function?

>  	/* Setup local timer */
>  	x86_init.timers.setup_percpu_clockev();
>  
> -- 
> 2.5.5
> 
> 
> 
>