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authorZachary Amsden <zach@vmware.com>2007-05-06 14:49:20 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:52 -0700
commit0013572b2ae535bfd6314f22d9aef53725ea00d8 (patch)
tree0c405dfe8a106099696ed9955b4405e6d7caed70 /include/asm-i386
parent10a8d6ae4b3182d6588a5809a8366343bc295c20 (diff)
downloadop-kernel-dev-0013572b2ae535bfd6314f22d9aef53725ea00d8.zip
op-kernel-dev-0013572b2ae535bfd6314f22d9aef53725ea00d8.tar.gz
i386: use pte_update_defer in ptep_test_and_clear_{dirty,young}
If you actually clear the bit, you need to: + pte_update_defer(vma->vm_mm, addr, ptep); The reason is, when updating PTEs, the hypervisor must be notified. Using atomic operations to do this is fine for all hypervisors I am aware of. However, for hypervisors which shadow page tables, if these PTE modifications are not trapped, you need a post-modification call to fulfill the update of the shadow page table. Acked-by: Zachary Amsden <zach@vmware.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: 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/asm-i386')
-rw-r--r--include/asm-i386/pgtable.h38
1 files changed, 18 insertions, 20 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 995e8b3..e16359f 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -297,22 +297,24 @@ do { \
} while (0)
#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 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; \
+})
#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);
-}
+#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; \
+})
/*
* Rules for using ptep_establish: the pte MUST be a user pte, and
@@ -330,10 +332,8 @@ do { \
({ \
int __dirty; \
__dirty = ptep_test_and_clear_dirty((vma), (address), (ptep)); \
- if (__dirty) { \
- pte_update_defer((vma)->vm_mm, (address), (ptep)); \
+ if (__dirty) \
flush_tlb_page(vma, address); \
- } \
__dirty; \
})
@@ -342,10 +342,8 @@ do { \
({ \
int __young; \
__young = ptep_test_and_clear_young((vma), (address), (ptep)); \
- if (__young) { \
- pte_update_defer((vma)->vm_mm, (address), (ptep)); \
+ if (__young) \
flush_tlb_page(vma, address); \
- } \
__young; \
})
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