From: "Andreas Herrmann3" <andreas.herrmann3@AMD.COM>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
"Venki Pallipadi" <venkatesh.pallipadi@intel.com>,
ak@muc.de, ebiederm@xmission.com, rdreier@cisco.com,
torvalds@linux-foundation.org, gregkh@suse.de, airlied@skynet.ie,
davej@redhat.com, tglx@linutronix.de, hpa@zytor.com,
akpm@linux-foundation.org, arjan@infradead.org,
jesse.barnes@intel.com, davem@davemloft.net,
linux-kernel@vger.kernel.org
Subject: Re: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes
Date: Thu, 17 Jan 2008 23:06:50 +0100 [thread overview]
Message-ID: <20080117220650.GE12631@alberich.amd.com> (raw)
In-Reply-To: <20080117214209.GA12811@elte.hu>
On Thu, Jan 17, 2008 at 10:42:09PM +0100, Ingo Molnar wrote:
>
> * Siddha, Suresh B <suresh.b.siddha@intel.com> wrote:
>
> > On Thu, Jan 17, 2008 at 10:13:08PM +0100, Ingo Molnar wrote:
> > > but in general we must be robust enough in this case and just degrade
> > > any overlapping page to UC (and emit a warning perhaps) - instead of
> > > failing the ioremap and thus failing the driver (and the bootup).
> >
> > But then, this will cause an attribute conflicit. Old one was
> > specifying WB in PAT (ioremap with noflags) and the new ioremap
> > specifies UC.
>
> we could fix up all aliases of that page as well and degrade them to UC?
Yes, we must fix all aliases or reject the conflicting mapping.
But fixing all aliases might not be that easy.
(I've just seen a panic when using your patch ;-(
Andreas
next prev parent reply other threads:[~2008-01-17 22:07 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-16 2:39 [patch 0/4] x86: PAT followup - Incremental changes and bug fixes venkatesh.pallipadi
2008-01-16 2:39 ` [patch 1/4] x86: PAT followup - Do not fold two bits in _PAGE_PCD venkatesh.pallipadi
2008-01-16 2:39 ` [patch 2/4] x86: PAT followup - Remove KERNPG_TABLE from pte entry venkatesh.pallipadi
2008-01-16 8:14 ` Mika Penttilä
2008-01-16 18:17 ` Pallipadi, Venkatesh
2008-01-17 0:18 ` Venki Pallipadi
2008-01-16 2:39 ` [patch 3/4] x86: PAT followup - Remove reserved pages mapping to zero page and not map them venkatesh.pallipadi
2008-01-16 2:39 ` [patch 4/4] x86: PAT followup - use ioremap for devmem read of reserved regions venkatesh.pallipadi
2008-01-16 7:33 ` Ingo Molnar
2008-01-16 7:29 ` [patch 0/4] x86: PAT followup - Incremental changes and bug fixes Ingo Molnar
2008-01-16 18:57 ` Andreas Herrmann
2008-01-16 19:05 ` Pallipadi, Venkatesh
2008-01-16 19:37 ` Pallipadi, Venkatesh
2008-01-16 20:24 ` Ingo Molnar
2008-01-16 20:33 ` Venki Pallipadi
2008-01-16 22:01 ` Andi Kleen
2008-01-16 22:14 ` Pallipadi, Venkatesh
2008-01-16 22:29 ` Andi Kleen
2008-01-17 19:12 ` Andreas Herrmann3
2008-01-17 19:54 ` Andreas Herrmann3
2008-01-17 20:36 ` Ingo Molnar
2008-01-17 20:33 ` H. Peter Anvin
2008-01-17 20:56 ` Ingo Molnar
2008-01-17 20:57 ` Linus Torvalds
2008-01-17 20:44 ` Ingo Molnar
2008-01-17 21:03 ` Andreas Herrmann3
2008-01-17 21:13 ` Ingo Molnar
2008-01-17 21:22 ` Ingo Molnar
2008-01-17 21:31 ` Siddha, Suresh B
2008-01-17 21:38 ` H. Peter Anvin
2008-01-24 20:22 ` Eric W. Biederman
2008-01-24 21:36 ` H. Peter Anvin
2008-01-17 21:42 ` Ingo Molnar
2008-01-17 22:06 ` Andreas Herrmann3 [this message]
2008-01-17 22:05 ` H. Peter Anvin
2008-01-17 22:15 ` Ingo Molnar
2008-01-17 22:52 ` Andreas Herrmann3
2008-01-17 23:04 ` Venki Pallipadi
2008-01-17 23:24 ` Andreas Herrmann3
2008-01-17 23:42 ` Pallipadi, Venkatesh
2008-01-18 16:10 ` Andreas Herrmann3
2008-01-18 17:13 ` Pallipadi, Venkatesh
2008-01-18 17:33 ` Balbir Singh
2008-01-18 4:25 ` Andi Kleen
2008-01-17 21:42 ` Andreas Herrmann3
2008-01-17 22:13 ` Ingo Molnar
2008-01-17 22:16 ` Andreas Herrmann3
2008-01-17 22:26 ` Andreas Herrmann3
2008-01-17 22:35 ` Ingo Molnar
2008-01-17 23:06 ` Andreas Herrmann3
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