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Date: Sat, 22 Sep 2007 00:32:47 +0200 (CEST) From: Andi Kleen <ak@...e.de> To: jbeulich@...ell.com, patches@...-64.org, linux-kernel@...r.kernel.org Subject: [PATCH] [47/50] i386: avoid temporarily inconsistent pte-s From: "Jan Beulich" <jbeulich@...ell.com> 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 <jbeulich@...ell.com> Signed-off-by: Andi Kleen <ak@...e.de> arch/i386/mm/pgtable.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) Index: linux/arch/i386/mm/pgtable.c =================================================================== --- linux.orig/arch/i386/mm/pgtable.c +++ linux/arch/i386/mm/pgtable.c @@ -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)); else pte_clear(&init_mm, vaddr, pte); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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