diff options
| author | David Rientjes <rientjes@google.com> | 2007-05-06 14:49:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:12:52 -0700 |
| commit | 10a8d6ae4b3182d6588a5809a8366343bc295c20 (patch) | |
| tree | 37a1d626c350df5f4a4234a0fcaf524f5755fe4a | |
| parent | 9490991482a2091a828d997adbc088e24c310a4d (diff) | |
i386: add ptep_test_and_clear_{dirty,young}
Add ptep_test_and_clear_{dirty,young} to i386. They advertise that they
have it and there is at least one place where it needs to be called without
the page table lock: to clear the accessed bit on write to
/proc/pid/clear_refs.
ptep_clear_flush_{dirty,young} are updated to use the new functions. The
overall net effect to current users of ptep_clear_flush_{dirty,young} is
that we introduce an additional branch.
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-i386/pgtable.h | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index c6b8b944120c..995e8b34efd0 100644 --- a/include/asm-i386/pgtable.h +++ b/include/asm-i386/pgtable.h @@ -296,12 +296,23 @@ do { \ } \ } while (0) -/* - * We don't actually have these, but we want to advertise them so that - * we can encompass the flush here. - */ #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY +static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + if (!pte_dirty(*ptep)) + return 0; + return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte_low); +} + #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG +static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + if (!pte_young(*ptep)) + return 0; + return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte_low); +} /* * Rules for using ptep_establish: the pte MUST be a user pte, and @@ -318,9 +329,8 @@ do { \ #define ptep_clear_flush_dirty(vma, address, ptep) \ ({ \ int __dirty; \ - __dirty = pte_dirty(*(ptep)); \ + __dirty = ptep_test_and_clear_dirty((vma), (address), (ptep)); \ if (__dirty) { \ - clear_bit(_PAGE_BIT_DIRTY, &(ptep)->pte_low); \ pte_update_defer((vma)->vm_mm, (address), (ptep)); \ flush_tlb_page(vma, address); \ } \ @@ -331,9 +341,8 @@ do { \ #define ptep_clear_flush_young(vma, address, ptep) \ ({ \ int __young; \ - __young = pte_young(*(ptep)); \ + __young = ptep_test_and_clear_young((vma), (address), (ptep)); \ if (__young) { \ - clear_bit(_PAGE_BIT_ACCESSED, &(ptep)->pte_low); \ pte_update_defer((vma)->vm_mm, (address), (ptep)); \ flush_tlb_page(vma, address); \ } \ |