From: ebiederm@xmission.com (Eric W. Biederman)
To: Roland Dreier <rdreier@cisco.com>
Cc: venkatesh.pallipadi@intel.com, ak@muc.de,
torvalds@linux-foundation.org, gregkh@suse.de, airlied@skynet.ie,
davej@redhat.com, mingo@elte.hu, tglx@linutronix.de,
hpa@zytor.com, akpm@linux-foundation.org, arjan@infradead.org,
jesse.barnes@intel.com, linux-kernel@vger.kernel.org,
Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: [RFC PATCH 06/12] PAT 64b: Add ioremap_wc support
Date: Thu, 13 Dec 2007 21:48:36 -0700 [thread overview]
Message-ID: <m1odctq3tn.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <ada4pel7v6a.fsf@cisco.com> (Roland Dreier's message of "Thu, 13 Dec 2007 20:32:45 -0800")
Roland Dreier <rdreier@cisco.com> writes:
> > > Also I didn't see anything like pgprot_wc() in the patchset (although
>
> > pgprot_writcombined.
>
> Oh I see it now (pgprot_writecombine() actually).
>
> However the same comment as before applies: there needs to be a
> fallback to pgprot_noncached() for all other architectures so that
> drivers can actually use it in a sane way.
Sounds reasonable.
There are three distinct pieces to this.
- Getting arch/x86 caught up the state art in linux
- Getting the state of the art generalized so everyone can use it.
- Figuring how to generally do the proper conflict checking so we
don't shoot ourselves in the head by accident.
They are all independent problems and can be solved in any order.
It should be the conflict checking that is the actual bottleneck.
The rest is just gravy.
Eric
next prev parent reply other threads:[~2007-12-14 4:51 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-13 23:55 [RFC PATCH 00/12] PAT 64b: PAT support for X86_64 venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 01/12] PAT 64b: Add cpu_shutdown() support venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 02/12] PAT 64b: Basic PAT implementation venkatesh.pallipadi
2007-12-14 0:42 ` Andi Kleen
2007-12-14 18:31 ` Venki Pallipadi
2007-12-18 4:50 ` Eric W. Biederman
2007-12-14 3:48 ` Eric W. Biederman
2007-12-14 4:23 ` Eric W. Biederman
2007-12-14 21:10 ` Siddha, Suresh B
2007-12-14 23:34 ` Siddha, Suresh B
2007-12-15 7:55 ` Ingo Molnar
2007-12-14 10:25 ` Andi Kleen
2007-12-14 19:45 ` H. Peter Anvin
2007-12-18 4:42 ` Eric W. Biederman
2007-12-14 21:06 ` Siddha, Suresh B
2007-12-13 23:55 ` [RFC PATCH 03/12] PAT 64b: drm driver changes for PAT venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 04/12] PAT 64b: reserve_mattr and free_mattr " venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 05/12] PAT 64b: pci mmap conlfict patch venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 06/12] PAT 64b: Add ioremap_wc support venkatesh.pallipadi
2007-12-14 4:17 ` Roland Dreier
2007-12-14 4:28 ` Eric W. Biederman
2007-12-14 4:32 ` Roland Dreier
2007-12-14 4:48 ` Eric W. Biederman [this message]
2007-12-14 21:40 ` Siddha, Suresh B
2007-12-14 23:19 ` Andi Kleen
2007-12-18 8:29 ` Eric W. Biederman
2007-12-13 23:55 ` [RFC PATCH 07/12] PAT 64b: dev mem chanegs for pat venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl venkatesh.pallipadi
2007-12-14 0:19 ` Greg KH
2007-12-14 0:35 ` David Miller
2007-12-14 6:34 ` Greg KH
2007-12-16 21:57 ` Paul Mackerras
2007-12-17 12:41 ` Andi Kleen
2007-12-18 4:30 ` Eric W. Biederman
2007-12-18 4:51 ` H. Peter Anvin
2007-12-18 9:35 ` Andi Kleen
2007-12-18 13:48 ` Eric W. Biederman
2007-12-14 0:43 ` Andi Kleen
2007-12-14 0:54 ` Jesse Barnes
2007-12-14 3:59 ` Eric W. Biederman
2007-12-14 6:02 ` Greg KH
2007-12-14 6:04 ` Eric W. Biederman
2007-12-14 10:19 ` Andi Kleen
2007-12-13 23:55 ` [RFC PATCH 09/12] PAT 64b: map only usable memory in identity mapping venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 10/12] PAT 64b: Make acpi use early map instead of assuming identity map venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 11/12] PAT 64b: devmem do not read pages not mapped in " venkatesh.pallipadi
2007-12-13 23:55 ` [RFC PATCH 12/12] PAT 64b: skip attr tracking for RAM venkatesh.pallipadi
2007-12-14 0:28 ` [RFC PATCH 00/12] PAT 64b: PAT support for X86_64 Dave Airlie
2007-12-14 22:00 ` Siddha, Suresh B
2007-12-14 22:27 ` Dave Airlie
2007-12-14 22:32 ` H. Peter Anvin
2007-12-14 22:37 ` Dave Airlie
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