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i386: add ptep_test_and_clear_{dirty,young}

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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>
This commit is contained in:
David Rientjes 2007-05-06 14:49:19 -07:00 committed by Linus Torvalds
parent 9490991482
commit 10a8d6ae4b
1 changed files with 17 additions and 8 deletions
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25
include/asm-i386/pgtable.h
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@ -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); \
} \