From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 27 Feb 2008 19:57:40 +0000 (+0100)
Subject: x86: check physical address range in ioremap
X-Git-Tag: v2.6.26-rc1~1154^2~505
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e3100c82abd9aa643dc15828202aceeae3504e03;p=pandora-kernel.git

x86: check physical address range in ioremap

Roland Dreier reported in http://lkml.org/lkml/2008/2/27/194

[ 8425.915139] BUG: unable to handle kernel paging request at ffffc20001a0a000
[ 8425.919087] IP: [<ffffffff8021dacc>] clflush_cache_range+0xc/0x25
[ 8425.919087] PGD 1bf80e067 PUD 1bf80f067 PMD 1bb497067 PTE 80000047000ee17b

This is on a Intel machine with 36bit physical address space. The PTE
entry references 47000ee000, which is outside of it.

Add a check for the physical address space and warn/printk about the
stupid caller.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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