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authorZachary Amsden <zach@vmware.com>2006-12-07 04:14:09 +0300
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 04:14:09 +0300
commit8ecb8950695e907ed25acffec9e98c6806e311c8 (patch)
treedfa4a6cf29b1f6fe173a0d6998b3f3fb55b5422f /include/asm-i386/pgtable-2level.h
parentdfbea0ad50e08c52539bddce977b07f77a762ba4 (diff)
downloadlinux-8ecb8950695e907ed25acffec9e98c6806e311c8.tar.xz
[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-2level.h')
-rw-r--r--include/asm-i386/pgtable-2level.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/asm-i386/pgtable-2level.h b/include/asm-i386/pgtable-2level.h
index c08cbc4c2d8b..38c3fcc0676d 100644
--- a/include/asm-i386/pgtable-2level.h
+++ b/include/asm-i386/pgtable-2level.h
@@ -23,8 +23,7 @@
#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
-#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
-#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
+#define raw_ptep_get_and_clear(xp) __pte(xchg(&(xp)->pte_low, 0))
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define pte_none(x) (!(x).pte_low)