Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=10a8d6ae4b3182d6588a5809a8366343bc295c20
Commit: 10a8d6ae4b3182d6588a5809a8366343bc295c20
Parent: 9490991482a2091a828d997adbc088e24c310a4d
Author: David Rientjes <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 14:49:19 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon May 7 12:12:52 2007 -0700
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 <[EMAIL PROTECTED]>
Cc: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: David Rientjes <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
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 c6b8b94..995e8b3 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); \
} \
-
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