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| author | Dave McCracken <dmccr@us.ibm.com> | 2006-09-26 08:31:48 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 17:48:51 +0200 |
| commit | 46a82b2d5591335277ed2930611f6acb4ce654ed (patch) | |
| tree | e90bc1843701af2012bae92564f7109027a8244f /include/asm-alpha | |
| parent | [PATCH] fix potential stack overflow in mm/slab.c (diff) | |
| download | linux-46a82b2d5591335277ed2930611f6acb4ce654ed.tar.xz linux-46a82b2d5591335277ed2930611f6acb4ce654ed.zip | |
[PATCH] Standardize pxx_page macros
One of the changes necessary for shared page tables is to standardize the
pxx_page macros. pte_page and pmd_page have always returned the struct
page associated with their entry, while pte_page_kernel and pmd_page_kernel
have returned the kernel virtual address. pud_page and pgd_page, on the
other hand, return the kernel virtual address.
Shared page tables needs pud_page and pgd_page to return the actual page
structures. There are very few actual users of these functions, so it is
simple to standardize their usage.
Since this is basic cleanup, I am submitting these changes as a standalone
patch. Per Hugh Dickins' comments about it, I am also changing the
pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning.
Signed-off-by: Dave McCracken <dmccr@us.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-alpha')
| -rw-r--r-- | include/asm-alpha/mmzone.h | 1 | ||||
| -rw-r--r-- | include/asm-alpha/pgtable.h | 9 |
2 files changed, 6 insertions, 4 deletions
diff --git a/include/asm-alpha/mmzone.h b/include/asm-alpha/mmzone.h index 64d0ab98fcd8..8af56ce346ad 100644 --- a/include/asm-alpha/mmzone.h +++ b/include/asm-alpha/mmzone.h @@ -75,6 +75,7 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p, int n) #define VALID_PAGE(page) (((page) - mem_map) < max_mapnr) #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> 32)) +#define pgd_page(pgd) (pfn_to_page(pgd_val(pgd) >> 32)) #define pte_pfn(pte) (pte_val(pte) >> 32) #define mk_pte(page, pgprot) \ diff --git a/include/asm-alpha/pgtable.h b/include/asm-alpha/pgtable.h index 93eaa58b7961..49ac9bee7ced 100644 --- a/include/asm-alpha/pgtable.h +++ b/include/asm-alpha/pgtable.h @@ -230,16 +230,17 @@ extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp) extern inline unsigned long -pmd_page_kernel(pmd_t pmd) +pmd_page_vaddr(pmd_t pmd) { return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET; } #ifndef CONFIG_DISCONTIGMEM #define pmd_page(pmd) (mem_map + ((pmd_val(pmd) & _PFN_MASK) >> 32)) +#define pgd_page(pgd) (mem_map + ((pgd_val(pgd) & _PFN_MASK) >> 32)) #endif -extern inline unsigned long pgd_page(pgd_t pgd) +extern inline unsigned long pgd_page_vaddr(pgd_t pgd) { return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); } extern inline int pte_none(pte_t pte) { return !pte_val(pte); } @@ -293,13 +294,13 @@ extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; retu /* Find an entry in the second-level page table.. */ extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) { - return (pmd_t *) pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); + return (pmd_t *) pgd_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1)); } /* Find an entry in the third-level page table.. */ extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address) { - return (pte_t *) pmd_page_kernel(*dir) + return (pte_t *) pmd_page_vaddr(*dir) + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1)); } |