diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2011-01-13 15:47:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:44 -0800 |
| commit | c489f1257b8cacd4881a18da1e93659f934a8e98 (patch) | |
| tree | c06e1611a9af8726999d3d95599934910237735b /arch/x86 | |
| parent | 0ca1634d4143c3579273ca53b993df19f5c98e92 (diff) | |
thp: add pmd_modify
Add pmd_modify() for use with mprotect() on huge pmds.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/pgtable.h | 10 | ||||
| -rw-r--r-- | arch/x86/include/asm/pgtable_types.h | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 001a3831567..c48ba055f69 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -325,6 +325,16 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) return __pte(val); } +static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) +{ + pmdval_t val = pmd_val(pmd); + + val &= _HPAGE_CHG_MASK; + val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK; + + return __pmd(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) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index a81a6bfc143..7db7723d1f3 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -72,6 +72,7 @@ /* Set of bits not changed in pte_modify */ #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \ _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE) #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT) #define _PAGE_CACHE_WB (0) |