From c489f1257b8cacd4881a18da1e93659f934a8e98 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Thu, 13 Jan 2011 15:47:02 -0800 Subject: thp: add pmd_modify Add pmd_modify() for use with mprotect() on huge pmds. Signed-off-by: Johannes Weiner Signed-off-by: Andrea Arcangeli Reviewed-by: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/x86/include/asm/pgtable.h') diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 001a3831567a..c48ba055f693 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) -- cgit v1.2.3