linux-kernel - Re: Breakage caused by unreviewed patch in x86 tree

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Message-ID: <4814FAA0.8060705@zytor.com>
Date:	Sun, 27 Apr 2008 15:13:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Breakage caused by unreviewed patch in x86 tree

James Bottomley wrote:
> On Sun, 2008-04-27 at 15:00 -0700, H. Peter Anvin wrote:
>> James Bottomley wrote:
>>> I might add that the intel SAPIC functions
>>> in roughly the same manner, so this might break more than just voyager.
>> Are you referring to the IA64 SAPIC here, or something else?  The only 
>> mention of SAPIC in the x86 tree appear to be naming of fields in ACPI 
>> tables.
> 
> Yes, that's the one ... but I believe a class of the xAPICs also used a
> similar principle.

I certainly have never seen a system on which the APIC has been mapped 
cacheable.  I would be very interested in the details, so if you could 
elaborate that would be extremely useful.

	-hpa

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