diff options
Diffstat (limited to 'include/asm-x86/pgtable.h')
| -rw-r--r-- | include/asm-x86/pgtable.h | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h index 801b31f71452..55c3a0e3a8ce 100644 --- a/include/asm-x86/pgtable.h +++ b/include/asm-x86/pgtable.h @@ -57,7 +57,8 @@ #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \ _PAGE_DIRTY) -#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_PCD | _PAGE_PWT | \ + _PAGE_ACCESSED | _PAGE_DIRTY) #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT) #define _PAGE_CACHE_WB (0) @@ -288,12 +289,21 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) * Chop off the NX bit (if present), and add the NX portion of * the newprot (if present): */ - val &= _PAGE_CHG_MASK & ~_PAGE_NX; - val |= pgprot_val(newprot) & __supported_pte_mask; + val &= _PAGE_CHG_MASK; + val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask; return __pte(val); } +/* mprotect needs to preserve PAT bits when updating vm_page_prot */ +#define pgprot_modify pgprot_modify +static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) +{ + pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; + pgprotval_t addbits = pgprot_val(newprot); + return __pgprot(preservebits | addbits); +} + #define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX)) #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask) |