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authorJeremy Fitzhardinge <jeremy@goop.org>2009-02-05 20:31:06 +0100
committerJeremy Fitzhardinge <jeremy@goop.org>2009-02-06 21:31:50 +0100
commit346309cff6127a38731cf102de3413a562700b84 (patch)
tree47e2c646b21d3637640b4d93b4ae6485aa4f9fa2 /arch/x86/include/asm/pgtable.h
parentx86: unify pmd_pfn (diff)
downloadlinux-346309cff6127a38731cf102de3413a562700b84.tar.xz
linux-346309cff6127a38731cf102de3413a562700b84.zip
x86: unify pte_index
Impact: cleanup Unify and demacro pte_index. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r--arch/x86/include/asm/pgtable.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 49b5cff78c28..10a8c2e51789 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -498,6 +498,17 @@ static inline unsigned pmd_index(unsigned long address)
*/
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
+/*
+ * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
+ *
+ * this function returns the index of the entry in the pte page which would
+ * control the given virtual address
+ */
+static inline unsigned pte_index(unsigned long address)
+{
+ return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+}
+
#if PAGETABLE_LEVELS > 2
static inline int pud_present(pud_t pud)
{