From aa506dc7b12d03fbf8fd11aab752aed1aadd9c07 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Wed, 17 Oct 2007 18:04:33 +0200 Subject: [PATCH] i386: 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. [ tglx: arch/x86 adaptation ] Signed-off-by: Jan Beulich Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner arch/x86/mm/pgtable_32.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- arch/x86/mm/pgtable_32.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c index ef1f6cd3ea66..bbaa2b153934 100644 --- a/arch/x86/mm/pgtable_32.c +++ b/arch/x86/mm/pgtable_32.c @@ -97,8 +97,7 @@ static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) } pte = pte_offset_kernel(pmd, vaddr); if (pgprot_val(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)); else pte_clear(&init_mm, vaddr, pte); -- 2.30.2