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

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Message-ID: <20090129232042.GA30601@elte.hu>
Date:	Fri, 30 Jan 2009 00:20:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
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


* Yinghai Lu <yinghai@...nel.org> wrote:

> Ingo Molnar wrote:
> > * Yinghai Lu <yinghai@...nel.org> wrote:
> > 
> >> 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?
> > 
> > yeah, we can certainly keep it - the code to conditionalize it is there 
> > and isnt causing problems really.
> 
> it seems X86_PC will always to 'y'
> 
> we may remove it, just use x86 to replace it etc.
> 
> [PATCH] x86: remove X86_PC macro
> 
> Impact: fix cutoff and remove left over MACRO
> 
> X86_PC is default, so don't need it any more.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>

applied to tip/x86/apic, thanks!

	Ingo
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