linux-kernel - Re: [PATCH v9 08/12] x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI

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Message-Id: <20121016.134304.86248639.d.hatayama@jp.fujitsu.com>
Date:	Tue, 16 Oct 2012 13:43:04 +0900 (JST)
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	fenghua.yu@...el.com
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	asit.k.mallick@...el.com, tony.luck@...el.com,
	arjan@...ux.intel.com, suresh.b.siddha@...el.com,
	len.brown@...el.com, srivatsa.bhat@...ux.vnet.ibm.com,
	rdunlap@...otime.net, gong.chen@...ux.intel.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH v9 08/12] x86, hotplug: Wake up CPU0 via NMI instead of
 INIT, SIPI, SIPI

From: Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v9 08/12] x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI
Date: Fri, 12 Oct 2012 09:09:45 -0700

<cut>

> @@ -1037,6 +1101,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
>  	 */
>  	setup_local_APIC();
>  
> +	cpu0_logical_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
> +

In x2apic mode, logical apicid occupies a whole 32-bit length of LDR,
but GET_APIC_LOGICAL_ID returns high 31-24 bits only, and this is only
for xapic mode.

Thanks.
HATAYAMA, Daisuke

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