linux-kernel - Re: x86_64: MAX_LOCAL

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Message-ID: <20150926060812.GA27630@gmail.com>
Date:	Sat, 26 Sep 2015 08:08:12 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: x86_64: MAX_LOCAL_APIC way too big?


* Denys Vlasenko <dvlasenk@...hat.com> wrote:

> For 64-bit kernels, MAX_LOCAL_APIC is 32k:
> 
> #ifdef CONFIG_X86_32
> ...
> #else
> # define MAX_IO_APICS 128
> # define MAX_LOCAL_APIC 32768
> #endif
> 
> (It seems to be a bit of a misnomer, it's not a maximum
> number of APICs we support, it's the highest APIC _id_
> we support.)

Gah, that's a pretty serious misnomer - so it should be fixed regardless of 
the outcome of the sizing discussion.

Thanks,

	Ingo
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