From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 20 Feb 2009 21:18:08 +0000 (+0100)
Subject: x86, mm: fault.c, enable PF_RSVD checks on 32-bit too
X-Git-Tag: v2.6.30-rc1~211^2~43^5~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=121d5d0a7e5808fbcfda484efd7ba840ac93450f;p=pandora-kernel.git

x86, mm: fault.c, enable PF_RSVD checks on 32-bit too

Impact: improve page fault handling robustness

The 'PF_RSVD' flag (bit 3) of the page-fault error_code is a
relatively recent addition to x86 CPUs, so the 32-bit do_fault()
implementation never had it. This flag gets set when the CPU
detects nonzero values in any reserved bits of the page directory
entries.

Extend the existing 64-bit check for PF_RSVD in do_page_fault()
to 32-bit too. If we detect such a fault then we print a more
informative oops and the pagetables.

This unifies the code some more, removes an ugly #ifdef and improves
the 32-bit page fault code robustness a bit. It slightly increases
the 32-bit kernel text size.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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