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 - 7:11 pm

On Sun, 27 Apr 2008 19:03:59 -0400
James Bottomley <James.Bottomley@HansenPartnership.com> wrote:


on a PC, NONE of the ioremap()s of PCI stuff were cached before, with the
exception of prefetchable ranges, that some bioses set up a write-combining MTRR for.
(and write-combining is effectively "uncached but with write buffering")

If you look at at what kind of devices have prefetchable ranges, you get two answers:
1) video cards
2) some IB adapters


So your argument that this might change PCI stuff is just false.

Your argument that this "99.9%->100% uncached" should have been announced/discussed
in public, sure. But to make this big a deal out of it?

-- 
If you want to reach me at my work email, use arjan@linux.intel.com
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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)