diff options
author | Zachary Amsden <zach@vmware.com> | 2006-12-06 20:14:09 -0500 |
---|---|---|
committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-06 20:14:09 -0500 |
commit | 8ecb8950695e907ed25acffec9e98c6806e311c8 (patch) | |
tree | dfa4a6cf29b1f6fe173a0d6998b3f3fb55b5422f /include/asm-i386/pgtable.h | |
parent | dfbea0ad50e08c52539bddce977b07f77a762ba4 (diff) |
[PATCH] paravirt: fix missing pte update
The function ptep_get_and_clear uses an atomic instruction sequence to get and
clear an active pte. Rather than add such an atomic operator to all virtual
machine implementations in paravirt-ops, it is easier to support the raw
atomic sequence and use either a trapping writable pagetable approach, or a
post-update notification. For the post update notification, we require the
pte_update function to be called after the access. Combine the 2-level and
3-level paging operators into one common function which does the post-update
notification, and rename the actual atomic sequences to raw_ptep_xxx
operators.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@muc.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'include/asm-i386/pgtable.h')
-rw-r--r-- | include/asm-i386/pgtable.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index 04dd39b973ad..b4a301f647ba 100644 --- a/include/asm-i386/pgtable.h +++ b/include/asm-i386/pgtable.h | |||
@@ -326,6 +326,14 @@ do { \ | |||
326 | __young; \ | 326 | __young; \ |
327 | }) | 327 | }) |
328 | 328 | ||
329 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR | ||
330 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | ||
331 | { | ||
332 | pte_t pte = raw_ptep_get_and_clear(ptep); | ||
333 | pte_update(mm, addr, ptep); | ||
334 | return pte; | ||
335 | } | ||
336 | |||
329 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL | 337 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
330 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full) | 338 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full) |
331 | { | 339 | { |