linux-kernel - Re: [RFC PATCH 3/4] x86: using logical flat for amd cpu too.

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Date:	Tue, 12 Jan 2010 00:47:03 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/4] x86: using logical flat for amd cpu too.

On Mon, Jan 11, 2010 at 7:16 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>
> On Mon, 11 Jan 2010, Yinghai Lu wrote:
>>
>> tested that amd support logical flat too when cpus num <= 8 and even
>> bsp apic id > 8
>>
>> so could remove vendor check...
>
> At least this one makes code simpler.
>
> What was the background for thinking that AMD didn't support the same APIC
> addressing models? If there really is some issue external to the CPU's
> themselves, whatever problem was attributed to AMD might be the same (or
> similar) problem that Ananth had.

not sure.

i remembered that bios fix one apic dest apic id in ioapic register.
before that that field
is set to 0 always.

YH
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