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[PATCH] lock PTE before updating it in 440/BookE page fault handler

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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 <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
This commit is contained in:
Eugene Surovegin 2006-03-28 10:13:12 -08:00 • committed by Paul Mackerras
commit bab70a4af7
5 changed files with 44 additions and 31 deletions
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3
include/asm-ppc/pgtable.h
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@ -837,7 +837,8 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,
*/
#define pgtable_cache_init() do { } while (0)
extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep);
extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep,
pmd_t **pmdp);
#include <asm-generic/pgtable.h>