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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(-)
This commit is contained in:
Jan Beulich 2007-10-17 18:04:33 +02:00 committed by Thomas Gleixner
parent d72b1b4f41
commit aa506dc7b1
1 changed files with 1 additions and 2 deletions
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3
arch/x86/mm/pgtable_32.c
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@ -97,8 +97,7 @@ static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
} }
pte = pte_offset_kernel(pmd, vaddr); pte = pte_offset_kernel(pmd, vaddr);
if (pgprot_val(flags)) if (pgprot_val(flags))
/* <pfn,flags> stored as-is, to permit clearing entries */ set_pte_present(&init_mm, vaddr, pte, pfn_pte(pfn, flags));
set_pte(pte, pfn_pte(pfn, flags));
else else
pte_clear(&init_mm, vaddr, pte); pte_clear(&init_mm, vaddr, pte);