[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>

1 files changed, 6 insertions, 4 deletions

diff --git a/include/asm-mips/pgtable-64.h b/include/asm-mips/pgtable-64.h
index e3db93212eab..c59a1e21f5b0 100644
--- a/include/asm-mips/pgtable-64.h
+++ b/include/asm-mips/pgtable-64.h
@@ -178,24 +178,26 @@ static inline void pud_clear(pud_t *pudp)
 /* to find an entry in a page-table-directory */
 #define pgd_offset(mm,addr)     ((mm)->pgd + pgd_index(addr))
 
-static inline unsigned long pud_page(pud_t pud)
+static inline unsigned long pud_page_vaddr(pud_t pud)
 {
         return pud_val(pud);
 }
+#define pud_phys(pud)           (pud_val(pud) - PAGE_OFFSET)
+#define pud_page(pud)           (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
 
 /* Find an entry in the second-level page table.. */
 static inline pmd_t *pmd_offset(pud_t * pud, unsigned long address)
 {
-        return (pmd_t *) pud_page(*pud) + pmd_index(address);
+        return (pmd_t *) pud_page_vaddr(*pud) + pmd_index(address);
 }
 
 /* Find an entry in the third-level page table.. */
 #define __pte_offset(address)                                           \
         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset(dir, address)                                        \
-        ((pte_t *) (pmd_page_kernel(*dir)) + __pte_offset(address))
+        ((pte_t *) (pmd_page_vaddr(*dir)) + __pte_offset(address))
 #define pte_offset_kernel(dir, address)                                 \
-        ((pte_t *) pmd_page_kernel(*(dir)) +  __pte_offset(address))
+        ((pte_t *) pmd_page_vaddr(*(dir)) +  __pte_offset(address))
 #define pte_offset_map(dir, address)                                    \
         ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 #define pte_offset_map_nested(dir, address)                             \