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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2009-02-05 11:30:51 -0800 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2009-02-06 12:31:48 -0800 |
| commit | 4fea801ac95d6534a93aa01d3ac62be163d845af (patch) | |
| tree | a5a285d5fd1c07c8d24d8da2f0517ac3f71cc9ed /arch/x86 | |
| parent | 649e8ef60fac0a2f6960cdb090d73e78717ac065 (diff) | |
| download | linux-4fea801ac95d6534a93aa01d3ac62be163d845af.tar.gz linux-4fea801ac95d6534a93aa01d3ac62be163d845af.tar.bz2 linux-4fea801ac95d6534a93aa01d3ac62be163d845af.zip | |
x86: unify pmd_none
Impact: cleanup
Unify and demacro pmd_none.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/pgtable.h | 7 | ||||
| -rw-r--r-- | arch/x86/include/asm/pgtable_32.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/pgtable_64.h | 1 |
3 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 147d3f097ab0..2f38bbee77e7 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -450,6 +450,13 @@ static inline int pmd_present(pmd_t pmd) return pmd_val(pmd) & _PAGE_PRESENT; } +static inline int pmd_none(pmd_t pmd) +{ + /* Only check low word on 32-bit platforms, since it might be + out of sync with upper half. */ + return !(unsigned long)native_pmd_val(pmd); +} + #if PAGETABLE_LEVELS > 2 static inline int pud_present(pud_t pud) { diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h index f35160730b65..26e73569223c 100644 --- a/arch/x86/include/asm/pgtable_32.h +++ b/arch/x86/include/asm/pgtable_32.h @@ -85,8 +85,6 @@ extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t); /* The boot page tables (all created as a single array) */ extern unsigned long pg0[]; -/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */ -#define pmd_none(x) (!(unsigned long)pmd_val((x))) #define pmd_bad(x) ((pmd_val(x) & (PTE_FLAGS_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h index 471b3058f3d7..f3ad89433246 100644 --- a/arch/x86/include/asm/pgtable_64.h +++ b/arch/x86/include/asm/pgtable_64.h @@ -207,7 +207,6 @@ static inline int pud_large(pud_t pte) #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) #define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \ pmd_index(address)) -#define pmd_none(x) (!pmd_val((x))) #define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot)))) #define pmd_pfn(x) ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT) |