From: Ken Chen <kenneth.w.chen@intel.com>
Date: Tue, 21 Jun 2005 21:40:31 +0000 (-0700)
Subject: [IA64] fix nested_dtlb_miss handler for hugetlb address
X-Git-Tag: v2.6.13-rc1~68^2~539^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0393eed5c3220c9c3823a09a2d02329b8ff08b45;p=pandora-kernel.git

[IA64] fix nested_dtlb_miss handler for hugetlb address

The nested_dtlb_miss handler currently does not handle fault from
hugetlb address correctly.  It walks the page table assuming PAGE_SIZE.
Thus when taking a fault triggered from hugetlb address, it would not
calculate the pgd/pmd/pte address correctly and thus result an incorrect
invocation of ia64_do_page_fault().  In there, kernel will signal SIGBUS
and application dies (The faulting address is perfectly legal and we
have a valid pte for the corresponding user hugetlb address as well).
This patch fix the described kernel bug.  Since nested_dtlb_miss is a
rare event and a slow path anyway, I'm making the change without #ifdef
CONFIG_HUGETLB_PAGE for code readability.  Tony, please apply.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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