From: Chen, Kenneth W <kenneth.w.chen@intel.com>
Date: Wed, 11 Oct 2006 08:20:46 +0000 (-0700)
Subject: [PATCH] hugetlb: fix linked list corruption in unmap_hugepage_range()
X-Git-Tag: v2.6.19-rc2~131
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=502717f4e112b18d9c37753a32f675bec9f2838b;p=pandora-kernel.git

[PATCH] hugetlb: fix linked list corruption in unmap_hugepage_range()

commit fe1668ae5bf0145014c71797febd9ad5670d5d05 causes kernel to oops with
libhugetlbfs test suite.  The problem is that hugetlb pages can be shared
by multiple mappings.  Multiple threads can fight over page->lru in the
unmap path and bad things happen.  We now serialize __unmap_hugepage_range
to void concurrent linked list manipulation.  Such serialization is also
needed for shared page table page on hugetlb area.  This patch will fixed
the bug and also serve as a prepatch for shared page table.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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