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From: Linus Torvalds <torvalds@linux-foundation.org>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: ak@muc.de, ebiederm@xmission.com, rdreier@cisco.com,
gregkh@suse.de, airlied@skynet.ie, davej@redhat.com,
mingo@elte.hu, tglx@linutronix.de, akpm@linux-foundation.org,
arjan@infradead.org, "Barnes, Jesse" <jesse.barnes@intel.com>,
davem@davemloft.net, linux-kernel@vger.kernel.org, "Siddha,
Suresh B" <suresh.b.siddha@intel.com>
Subject: RE: [patch 02/11] PAT x86: Map only usable memory in x86_64 identity map and kernel text
Date: Thu, 10 Jan 2008 14:15:25 -0800 (PST) [thread overview]
Message-ID: <alpine.LFD.1.00.0801101413490.3148@woody.linux-foundation.org> (raw)
In-Reply-To: <924EFEDD5F540B4284297C4DC59F3DEE5A2958@orsmsx423.amr.corp.intel.com>
On Thu, 10 Jan 2008, Pallipadi, Venkatesh wrote:
>
> Yes. I had those pages not mapped at all earlier. The reason I switched
> to zero page is to continue support cases like:
> BIOS-e820: 0000000000000000 - 000000000009cc00 (usable)
> BIOS-e820: 000000000009cc00 - 00000000000a0000 (reserved)
> BIOS-e820: 00000000000cc000 - 00000000000d0000 (reserved)
> BIOS-e820: 00000000000e4000 - 0000000000100000 (reserved)
> BIOS-e820: 0000000000100000 - 00000000cff60000 (usable)
>
> In this case if some one does a dd of /dev/mem before they can read the
> contents of usable memory in 0x100000-0xcff60000 range.
Well, I think that /dev/mem should simply give them the right info. That's
what people use /dev/mem for - doing things like reading BIOS images etc.
So returning *either* a zero page *or* stopping at the first hole is both
equally wrong.
Linus
next prev parent reply other threads:[~2008-01-10 22:19 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-10 18:48 [patch 00/11] PAT x86: PAT support for x86 venkatesh.pallipadi
2008-01-10 18:48 ` [patch 01/11] PAT x86: Make acpi/other drivers map memory instead of assuming identity map venkatesh.pallipadi
2008-01-10 18:48 ` [patch 02/11] PAT x86: Map only usable memory in x86_64 identity map and kernel text venkatesh.pallipadi
2008-01-10 19:06 ` Andi Kleen
2008-01-10 19:17 ` Pallipadi, Venkatesh
2008-01-10 19:28 ` Andi Kleen
2008-01-10 20:50 ` Pallipadi, Venkatesh
2008-01-10 21:16 ` Andi Kleen
2008-01-10 22:25 ` Pallipadi, Venkatesh
2008-01-10 22:35 ` Andi Kleen
2008-01-14 16:43 ` Ingo Molnar
2008-01-14 21:21 ` Siddha, Suresh B
2008-01-14 21:28 ` Andi Kleen
2008-01-15 22:17 ` Ingo Molnar
2008-01-15 23:11 ` Andi Kleen
2008-01-15 23:21 ` Siddha, Suresh B
2008-01-18 12:01 ` Ingo Molnar
2008-01-18 13:12 ` Andi Kleen
2008-01-18 16:46 ` Jesse Barnes
2008-01-18 18:12 ` Andi Kleen
2008-01-18 19:02 ` Jesse Barnes
2008-01-19 2:42 ` Andi Kleen
2008-01-10 21:05 ` Linus Torvalds
2008-01-10 21:57 ` Pallipadi, Venkatesh
2008-01-10 22:15 ` Linus Torvalds [this message]
2008-01-10 22:27 ` Pallipadi, Venkatesh
2008-01-10 22:50 ` Valdis.Kletnieks
2008-01-18 18:27 ` Dave Jones
2008-01-18 20:54 ` Ingo Molnar
2008-01-10 18:48 ` [patch 03/11] PAT x86: Map only usable memory in i386 identity map venkatesh.pallipadi
2008-01-10 19:10 ` Andi Kleen
2008-01-10 18:48 ` [patch 04/11] PAT x86: Basic PAT implementation venkatesh.pallipadi
2008-01-10 18:48 ` [patch 05/11] PAT x86: drm driver changes for PAT venkatesh.pallipadi
2008-01-10 18:48 ` [patch 06/11] PAT x86: Refactoring i386 cpa venkatesh.pallipadi
2008-01-10 19:00 ` Andi Kleen
2008-01-14 16:47 ` Ingo Molnar
2008-01-10 18:48 ` [patch 07/11] PAT x86: pat-conflict resolution using linear list venkatesh.pallipadi
2008-01-10 19:13 ` Andi Kleen
2008-01-10 20:08 ` Pallipadi, Venkatesh
2008-01-10 18:48 ` [patch 08/11] PAT x86: pci mmap conlfict patch venkatesh.pallipadi
2008-01-10 18:48 ` [patch 09/11] PAT x86: Add ioremap_wc support venkatesh.pallipadi
2008-01-10 19:08 ` Andi Kleen
2008-01-10 19:25 ` Pallipadi, Venkatesh
2008-01-12 0:18 ` Roland Dreier
2008-01-10 18:48 ` [patch 10/11] PAT x86: Handle /dev/mem mappings venkatesh.pallipadi
2008-01-10 18:48 ` [patch 11/11] PAT x86: Expose uc and wc interfaces in /sysfs vor pci_mmap_resource venkatesh.pallipadi
2008-01-10 19:43 ` Greg KH
2008-01-10 20:54 ` [patch 11/11] PAT x86: Expose uc and wc interfaces in /sysfsvor pci_mmap_resource Pallipadi, Venkatesh
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