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powerpc/mm: Fix _PAGE_CHG_MASK to protect _PAGE_SPECIAL

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Fix _PAGE_CHG_MASK so that pte_modify() does not affect the _PAGE_SPECIAL bit.

Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Philippe Gerum 2009-02-12 12:18:46 +00:00 committed by Benjamin Herrenschmidt
parent b578f3fcca
commit fbc78b07ba
3 changed files with 4 additions and 3 deletions
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2
arch/powerpc/include/asm/pgtable-4k.h
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@ -60,7 +60,7 @@
/* It should be preserving the high 48 bits and then specifically */
/* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
_PAGE_HPTEFLAGS)
_PAGE_HPTEFLAGS | _PAGE_SPECIAL)
/* Bits to mask out from a PMD to get to the PTE page */
#define PMD_MASKED_BITS 0

2
arch/powerpc/include/asm/pgtable-64k.h
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@ -114,7 +114,7 @@ static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd)
* pgprot changes
*/
#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
_PAGE_ACCESSED)
_PAGE_ACCESSED | _PAGE_SPECIAL)
/* Bits to mask out from a PMD to get to the PTE page */
#define PMD_MASKED_BITS 0x1ff

3
arch/powerpc/include/asm/pgtable-ppc32.h
View File

@ -429,7 +429,8 @@ extern int icache_44x_need_flush;
#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
#endif
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
_PAGE_SPECIAL)
#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \