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| author | Jeremy Fitzhardinge | 2009-02-05 20:31:01 +0100 |
|---|---|---|
| committer | Jeremy Fitzhardinge | 2009-02-06 21:31:49 +0100 |
| commit | e24d7eee0beda24504bf6a4aa03be68328557475 (patch) | |
| tree | db6af59008420958bd27e7288fcc14add47bee74 /arch/x86/include/asm/pgtable.h | |
| parent | x86: unify pmd_page (diff) | |
| download | kernel-qcow2-linux-e24d7eee0beda24504bf6a4aa03be68328557475.tar.gz kernel-qcow2-linux-e24d7eee0beda24504bf6a4aa03be68328557475.tar.xz kernel-qcow2-linux-e24d7eee0beda24504bf6a4aa03be68328557475.zip | |
x86: unify pmd_index
Impact: cleanup
Unify and demacro pmd_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.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 38330d6288fc..4ec24b6d0994 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -478,6 +478,17 @@ static inline struct page *pmd_page(pmd_t pmd) return pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT); } +/* + * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] + * + * this macro returns the index of the entry in the pmd page which would + * control the given virtual address + */ +static inline unsigned pmd_index(unsigned long address) +{ + return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); +} + #if PAGETABLE_LEVELS > 2 static inline int pud_present(pud_t pud) { |