diff options
| author | Hugh Dickins <hugh@veritas.com> | 2007-06-16 10:15:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-16 13:16:15 -0700 |
| commit | d6f8bb1310d4745ff1d0c74eeacae31e2a3eeff1 (patch) | |
| tree | 4048f434ec97b0b0415e3937c1e42be9cb6ca378 /include | |
| parent | 30475cc12a50816f290828fb7e3cd7036cd622df (diff) | |
| download | lwn-d6f8bb1310d4745ff1d0c74eeacae31e2a3eeff1.tar.gz lwn-d6f8bb1310d4745ff1d0c74eeacae31e2a3eeff1.zip | |
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.h | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index 2394589786ba..d62bdb029efa 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; \ }) /* |