linux-kernel - Re: [PATCH] x86, acpi: Handle all SRAT cpu entries even have cpu num limitation

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Message-ID: <4D0943D5.1090404@kernel.org>
Date:	Wed, 15 Dec 2010 14:40:21 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nikanth Karthikesan <knikanth@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	"Zheng, Shaohui" <shaohui.zheng@...el.com>,
	"linux-hotplug@...r.kernel.org" <linux-hotplug@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Nikhil Rao <ncrao@...gle.com>,
	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
Subject: Re: [PATCH] x86, acpi: Handle all SRAT cpu entries even have cpu
 num limitation

On 12/15/2010 02:01 PM, H. Peter Anvin wrote:
> On 11/13/2010 05:38 PM, Yinghai Lu wrote:
>> Index: linux-2.6/arch/x86/kernel/acpi/boot.c
>> ===================================================================
>> --- linux-2.6.orig/arch/x86/kernel/acpi/boot.c
>> +++ linux-2.6/arch/x86/kernel/acpi/boot.c
>> @@ -198,6 +198,13 @@ static void __cpuinit acpi_register_lapi
>>  {
>>  	unsigned int ver = 0;
>>  
>> +#ifdef CONFIG_X86_64
>> +	if (id >= (MAX_APICS-1)) {
>> +		printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
>> +		return;
>> +	}
>> +#endif
>> +
>>  	if (!enabled) {
>>  		++disabled_cpus;
>>  		return;
> 
> Why the #ifdef?

try to limit the affects to 32bit's bunch sub arch etc.

Thanks

	Yinghai

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