linux-stable/include/asm-generic/4level-fixup.h
Dave McCracken 46a82b2d55 [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>
2006-09-26 08:48:51 -07:00

37 lines
1 KiB
C

#ifndef _4LEVEL_FIXUP_H
#define _4LEVEL_FIXUP_H
#define __ARCH_HAS_4LEVEL_HACK
#define __PAGETABLE_PUD_FOLDED
#define PUD_SIZE PGDIR_SIZE
#define PUD_MASK PGDIR_MASK
#define PTRS_PER_PUD 1
#define pud_t pgd_t
#define pmd_alloc(mm, pud, address) \
((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \
NULL: pmd_offset(pud, address))
#define pud_alloc(mm, pgd, address) (pgd)
#define pud_offset(pgd, start) (pgd)
#define pud_none(pud) 0
#define pud_bad(pud) 0
#define pud_present(pud) 1
#define pud_ERROR(pud) do { } while (0)
#define pud_clear(pud) pgd_clear(pud)
#define pud_val(pud) pgd_val(pud)
#define pud_populate(mm, pud, pmd) pgd_populate(mm, pud, pmd)
#define pud_page(pud) pgd_page(pud)
#define pud_page_vaddr(pud) pgd_page_vaddr(pud)
#undef pud_free_tlb
#define pud_free_tlb(tlb, x) do { } while (0)
#define pud_free(x) do { } while (0)
#define __pud_free_tlb(tlb, x) do { } while (0)
#undef pud_addr_end
#define pud_addr_end(addr, end) (end)
#endif