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| author |   Jan Beulich <jbeulich@novell.com> | 2006-12-07 02:14:09 +0100 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:09 +0100 |
| commit | b0bfece40b1988aa8e3d910938691dce7859d82d (patch) | |
| tree | 4432a5231bcbda6161729839ae0b1eaa0861ac1f | |
| parent | [PATCH] x86-64: Rate limit no irq handler messages (diff) | |
| download | linux-dev-b0bfece40b1988aa8e3d910938691dce7859d82d.tar.xz linux-dev-b0bfece40b1988aa8e3d910938691dce7859d82d.zip | |
[PATCH] i386: clear_fixmap() should not use set_pte()
While not strictly required with the current code (as the upper half of
page table entries generated by __set_fixmap() cannot be non-zero due
to the second parameter of this function being 'unsigned long'), the
use of set_pte() in __set_fixmap() in the context of clear_fixmap() is
still improper with CONFIG_X86_PAE (see the respective comment in
include/asm-i386/pgtable-3level.h) and would turn into a bug if that
second parameter ever gets changed to a 64-bit type.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
| -rw-r--r-- | arch/i386/mm/pgtable.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/i386/mm/pgtable.c b/arch/i386/mm/pgtable.c index 10126e3f8174..65b5c0959033 100644 --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -95,8 +95,11 @@ static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) return; } pte = pte_offset_kernel(pmd, vaddr); - /* <pfn,flags> stored as-is, to permit clearing entries */ - set_pte(pte, pfn_pte(pfn, flags)); + if (pgprot_val(flags)) + /* <pfn,flags> stored as-is, to permit clearing entries */ + set_pte(pte, pfn_pte(pfn, flags)); + else + pte_clear(&init_mm, vaddr, pte); /* * It's enough to flush this one mapping. |