linux-kernel - Re: [PATCH] x86: allow 8 more cpus could be used

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Message-ID: <4982315F.20705@kernel.org>
Date:	Thu, 29 Jan 2009 14:44:47 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: allow 8 more cpus could be used

Ingo Molnar wrote:
> * Yinghai Lu <yinghai@...nel.org> wrote:
> 
>> Impact: fix left out MARCO
>>
>> X86_PC will be always enabled. so need to check if we have bigsmp 
>> support built in before cut off more than 8 cpus.
> 
> ah, that's a leftover reference to X86_PC. It can now be removed, together 
> with the Kconfig X86_PC option.
> 
>> -#if defined(CONFIG_X86_PC) && defined(CONFIG_X86_32)
>> +#if defined(CONFIG_X86_PC) && !defined(CONFIG_X86_BIGSMP)
>>  	if (def_to_bigsmp && nr_cpu_ids > 8) {
>>  		unsigned int cpu;
>>  		unsigned nr;
> 
> Could you please send a patch that removes both X86_PC and X86_BIGSMP - 
> and removes the above cutoff code too, so that it will be built-in all the 
> time?

sure. maybe we could keep X86_BIGSMP for a while. So someone don't enable BIGSMP for small system?

YH
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