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Re: Breakage caused by unreviewed patch in x86 tree

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To: James Bottomley <James.Bottomley@...>
Cc: Ingo Molnar <mingo@...>, Thomas Gleixner <tglx@...>, linux-kernel <linux-kernel@...>
Date: Sunday, April 27, 2008 - 6:31 pm

James Bottomley wrote:

Well, I just looked up the xAPIC spec, and it states very clearly:

APIC registers are memory-mapped to a 4-KByte region of the processor’s 
physical address space with an initial starting address of FEE00000H. 
For correct APIC operation, this address space must be mapped to an area 
of memory that has been designated as strong uncacheable (UC). See 
Section 10.3, “Methods of Caching Available.”

So any use of cacheline-related bus cycles is generated by the LAPIC and 
doesn't affect the CPU <-> LAPIC interface.

	-hpa


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Messages in current thread:
Breakage caused by unreviewed patch in x86 tree, James Bottomley, (Sun Apr 27, 4:51 pm)
Re: Breakage caused by unreviewed patch in x86 tree, Arjan van de Ven, (Sun Apr 27, 6:58 pm)
Re: Breakage caused by unreviewed patch in x86 tree, James Bottomley, (Sun Apr 27, 7:03 pm)
Re: Breakage caused by unreviewed patch in x86 tree, H. Peter Anvin, (Sun Apr 27, 7:17 pm)
Re: Breakage caused by unreviewed patch in x86 tree, Arjan van de Ven, (Sun Apr 27, 7:11 pm)
Re: Breakage caused by unreviewed patch in x86 tree, David Miller, (Sun Apr 27, 7:00 pm)
Re: Breakage caused by unreviewed patch in x86 tree, Arjan van de Ven, (Sun Apr 27, 7:07 pm)
Re: Breakage caused by unreviewed patch in x86 tree, H. Peter Anvin, (Sun Apr 27, 6:00 pm)
Re: Breakage caused by unreviewed patch in x86 tree, James Bottomley, (Sun Apr 27, 6:10 pm)
Re: Breakage caused by unreviewed patch in x86 tree, H. Peter Anvin, (Sun Apr 27, 6:13 pm)
Re: Breakage caused by unreviewed patch in x86 tree, James Bottomley, (Sun Apr 27, 6:18 pm)
Re: Breakage caused by unreviewed patch in x86 tree, H. Peter Anvin, (Sun Apr 27, 6:31 pm)
[patch] x86, voyager: fix ioremap_nocache(), Ingo Molnar, (Sun Apr 27, 5:48 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), James Bottomley, (Sun Apr 27, 6:34 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Jeff Garzik, (Sun Apr 27, 6:39 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Arjan van de Ven, (Mon Apr 28, 10:10 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), James Bottomley, (Mon Apr 28, 10:29 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), Arjan van de Ven, (Mon Apr 28, 11:07 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Mon Apr 28, 3:59 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Thomas Gleixner, (Sun Apr 27, 7:01 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), David Miller, (Sun Apr 27, 6:46 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Arjan van de Ven, (Sun Apr 27, 7:01 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), James Bottomley, (Wed Apr 30, 5:44 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Wed Apr 30, 6:39 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Jeff Garzik, (Sun Apr 27, 6:53 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Sun Apr 27, 6:56 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Jeff Garzik, (Sun Apr 27, 7:02 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Arjan van de Ven, (Sun Apr 27, 7:14 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), David Miller, (Sun Apr 27, 6:59 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Sun Apr 27, 6:52 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Jeff Garzik, (Sun Apr 27, 7:34 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Sun Apr 27, 7:39 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), David Miller, (Sun Apr 27, 6:58 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Sun Apr 27, 7:04 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Eric W. Biederman, (Wed Apr 30, 4:35 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Sun Apr 27, 6:44 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), James Bottomley, (Sun Apr 27, 6:05 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Ingo Molnar, (Sun Apr 27, 7:18 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Christoph Hellwig, (Mon Apr 28, 2:10 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Mon Apr 28, 12:55 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), David Miller, (Sun Apr 27, 7:31 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Alan Cox, (Mon Apr 28, 5:01 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), David Miller, (Mon Apr 28, 5:17 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), Ingo Molnar, (Mon Apr 28, 7:50 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), Adrian Bunk, (Mon Apr 28, 5:48 am)
Re: [patch] x86, voyager: fix ioremap_nocache(), Rik van Riel, (Sun Apr 27, 8:31 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Al Viro, (Sun Apr 27, 8:45 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), H. Peter Anvin, (Sun Apr 27, 8:52 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Ingo Molnar, (Sun Apr 27, 6:41 pm)
Re: [patch] x86, voyager: fix ioremap_nocache(), Willy Tarreau, (Sun Apr 27, 6:36 pm)
Re: Breakage caused by unreviewed patch in x86 tree, David Miller, (Sun Apr 27, 4:53 pm)
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