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authorEugene Surovegin <ebs@ebshome.net>2006-03-28 13:13:12 -0500
committerPaul Mackerras <paulus@samba.org>2006-03-28 21:44:15 -0500
commitbab70a4af737f623de5b034976a311055308ab86 (patch)
treef8c0e9463de01323db2cb1a62f4eb83adb5ce7ca /include/asm-ppc
parentbac30d1a78d0f11c613968fc8b351a91ed465386 (diff)
[PATCH] lock PTE before updating it in 440/BookE page fault handler
Fix 44x and BookE page fault handler to correctly lock PTE before trying to pte_update() it, otherwise this PTE might be swapped out after pte_present() check but before pte_uptdate() call, resulting in corrupted PTE. This can happen with enabled preemption and low memory condition. Signed-off-by: Eugene Surovegin <ebs@ebshome.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-ppc')
-rw-r--r--include/asm-ppc/pgtable.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
index e1c62da12e74..570b355162fa 100644
--- a/include/asm-ppc/pgtable.h
+++ b/include/asm-ppc/pgtable.h
@@ -837,7 +837,8 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,
837 */ 837 */
838#define pgtable_cache_init() do { } while (0) 838#define pgtable_cache_init() do { } while (0)
839 839
840extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep); 840extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep,
841 pmd_t **pmdp);
841 842
842#include <asm-generic/pgtable.h> 843#include <asm-generic/pgtable.h>
843 844