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| author | Jeff Garzik <jgarzik@pobox.com> | 2005-10-06 05:51:07 -0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-10-06 05:51:07 -0400 |
| commit | 012e060c95e547eceea4a12c6f58592473bf4011 (patch) | |
| tree | b57d3eafb50ce517577d2cf366c9ef0b4b286589 /include/asm-generic/pgtable.h | |
| parent | 923f122573851d18a3832ca808269fa2d5046fb1 (diff) | |
| parent | ed39f731ab2e77e58122232f6e27333331d7793d (diff) | |
Merge branch 'master'
Diffstat (limited to 'include/asm-generic/pgtable.h')
| -rw-r--r-- | include/asm-generic/pgtable.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index f86c1e549466..ff28c8b31f58 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -158,6 +158,19 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres #define lazy_mmu_prot_update(pte) do { } while (0) #endif +#ifndef __HAVE_ARCH_MULTIPLE_ZERO_PAGE +#define move_pte(pte, prot, old_addr, new_addr) (pte) +#else +#define move_pte(pte, prot, old_addr, new_addr) \ +({ \ + pte_t newpte = (pte); \ + if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \ + pte_page(pte) == ZERO_PAGE(old_addr)) \ + newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \ + newpte; \ +}) +#endif + /* * When walking page tables, get the address of the next boundary, * or the end address of the range if that comes earlier. Although no |