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authorJan Beulich <jbeulich@novell.com>2007-10-17 18:04:33 +0200
committerThomas Gleixner <tglx@inhelltoy.tec.linutronix.de>2007-10-17 20:15:28 +0200
commitaa506dc7b12d03fbf8fd11aab752aed1aadd9c07 (patch)
treea4f60e7fbbaf1782ceb958ef3e91c44a849336e1 /arch
parentd72b1b4f41b5159d2d0e54e54c794d500197572e (diff)
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 <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> arch/x86/mm/pgtable_32.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/pgtable_32.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index ef1f6cd3ea6..bbaa2b15393 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))
- /* <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);