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authorHugh Dickins <hugh@veritas.com>2007-06-16 17:15:59 (GMT)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-16 20:16:15 (GMT)
commitd6f8bb1310d4745ff1d0c74eeacae31e2a3eeff1 (patch)
tree4048f434ec97b0b0415e3937c1e42be9cb6ca378 /include
parent30475cc12a50816f290828fb7e3cd7036cd622df (diff)
i386 mm: use pte_update() in ptep_test_and_clear_dirty()
It is not safe to use pte_update_defer() in ptep_test_and_clear_young(): its only user, /proc/<pid>/clear_refs, drops pte lock before flushing TLB. Use the safe though less efficient pte_update() paravirtop in its place. Likewise in ptep_test_and_clear_dirty(), though that has no current use. These are macros (header file dependency stops them from becoming inline functions), so be more liberal with the underscores and parentheses. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Zachary Amsden <zach@vmware.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-i386/pgtable.h26
1 files changed, 14 insertions, 12 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 2394589..d62bdb0 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -295,22 +295,24 @@ do { \
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
#define ptep_test_and_clear_dirty(vma, addr, ptep) ({ \
- int ret = 0; \
- if (pte_dirty(*ptep)) \
- ret = test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte_low); \
- if (ret) \
- pte_update_defer(vma->vm_mm, addr, ptep); \
- ret; \
+ int __ret = 0; \
+ if (pte_dirty(*(ptep))) \
+ __ret = test_and_clear_bit(_PAGE_BIT_DIRTY, \
+ &(ptep)->pte_low); \
+ if (__ret) \
+ pte_update((vma)->vm_mm, addr, ptep); \
+ __ret; \
})
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define ptep_test_and_clear_young(vma, addr, ptep) ({ \
- int ret = 0; \
- if (pte_young(*ptep)) \
- ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte_low); \
- if (ret) \
- pte_update_defer(vma->vm_mm, addr, ptep); \
- ret; \
+ int __ret = 0; \
+ if (pte_young(*(ptep))) \
+ __ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
+ &(ptep)->pte_low); \
+ if (__ret) \
+ pte_update((vma)->vm_mm, addr, ptep); \
+ __ret; \
})
/*

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