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Subject: Re: [RFC PATCH 3/4] x86: using logical flat for amd cpu too.
From: Yinghai Lu <yinghai@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
       "ananth@in.ibm.com" <ananth@in.ibm.com>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
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On Mon, Jan 11, 2010 at 7:16 PM, Linus Torvalds
<torvalds@linux-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