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Subject[PATCH] i386/PAE: avoid temporarily inconsistent pte-s
One more of these issues (which were considered fixed a few releases
back): Other than on x86-64, i386 allows set_fixmap() to replace
already present mappings. Consequently, on PAE, care must be taken to
not update the high half of a pte while the low half is still holding
the old value.

Signed-off-by: Jan Beulich <>

arch/i386/mm/pgtable.c | 3 +--
1 files changed, 1 insertion(+), 2 deletions(-)

--- linux-2.6.23-rc6/arch/i386/mm/pgtable.c 2007-09-14 17:38:47.000000000 +0200
+++ 2.6.23-rc6-i386-set-fixmap/arch/i386/mm/pgtable.c 2007-09-19 10:49:53.000000000 +0200
@@ -97,8 +97,7 @@ static void set_pte_pfn(unsigned long va
pte = pte_offset_kernel(pmd, vaddr);
if (pgprot_val(flags))
- /* <pfn,flags> stored as-is, to permit clearing entries */
- set_pte(pte, pfn_pte(pfn, flags));
+ set_pte_present(&init_mm, vaddr, pte, pfn_pte(pfn, flags));
pte_clear(&init_mm, vaddr, pte);

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