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SubjectRe: [GIT PULL] x86/uapi for 3.8
On 2012.12.14 at 17:47 -0800, Linus Torvalds wrote:
> On Fri, Dec 14, 2012 at 5:41 PM, Linus Torvalds
> <> wrote:
> > I was wrong. It's not the x86 UAPI split, it's the DT pull. More people added.
> Looking at the merge (just in case it could have done something odd),
> I'm starting to worry that this is some nasty heisenbug, and my
> bisection is not trustworthy at all. Because the DT pull sure as heck
> doesn't look like a likely candidate for anything either.
> Ho humm. Anybody else see anything strange?

Yes. I'm seeing a BUG early during boot on my machine (RIP=NULL):

BUG: unable to handle kernel NULL pointer dereference at (null)

This is caused by:

commit 53b87cf088e2ea68d7c59619d0214cc15bb76133
Author: Matt Fleming <>
Date: Fri Sep 7 18:23:51 2012 +0100

x86, mm: Include the entire kernel memory map in trampoline_pgd

There are various pieces of code in arch/x86 that require a page table
with an identity mapping. Make trampoline_pgd a proper kernel page
table, it currently only includes the kernel text and module space

One new feature of trampoline_pgd is that it now has mappings for the
physical I/O device addresses, which are inserted at ioremap()
time. Some broken implementations of EFI firmware require these
mappings to always be around.

Acked-by: Jan Beulich <>
Signed-off-by: Matt Fleming <>


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