linux-kernel - Re: [PATCH] x86: only set warm_reset

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Message-ID: <49A75FBD.6050602@kernel.org>
Date:	Thu, 26 Feb 2009 19:36:29 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: only set warm_reset_vector for NMI

please discard this one. it doesn't consider system with integrated apic.

YH

Yinghai Lu wrote:
> Impact: cleanup
> 
> don't need to set that for INIT etc
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  arch/x86/kernel/smpboot.c |   17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> Index: linux-2.6/arch/x86/kernel/smpboot.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/smpboot.c
> +++ linux-2.6/arch/x86/kernel/smpboot.c
> @@ -609,7 +609,7 @@ wakeup_secondary_cpu_via_nmi(int logical
>  	return (send_status | accept_status);
>  }
>  
> -int __devinit
> +static int __devinit
>  wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
>  {
>  	unsigned long send_status, accept_status = 0;
> @@ -816,11 +816,14 @@ do_rest:
>  
>  	atomic_set(&init_deasserted, 0);
>  
> -	if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
> +	if (apic->wakeup_secondary_cpu == wakeup_secondary_cpu_via_nmi) {
>  
>  		pr_debug("Setting warm reset code and vector.\n");
>  
>  		smpboot_setup_warm_reset_vector(start_ip);
> +	}
> +
> +	if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
>  		/*
>  		 * Be paranoid about clearing APIC errors.
>  		*/
> @@ -893,10 +896,12 @@ do_rest:
>  	/* mark "stuck" area as not stuck */
>  	*((volatile unsigned long *)trampoline_base) = 0;
>  
> -	/*
> -	 * Cleanup possible dangling ends...
> -	 */
> -	smpboot_restore_warm_reset_vector();
> +	if (apic->wakeup_secondary_cpu == wakeup_secondary_cpu_via_nmi) {
> +		/*
> +		 * Cleanup possible dangling ends...
> +		 */
> +		smpboot_restore_warm_reset_vector();
> +	}
>  
>  	return boot_error;
>  }
> 

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