From 8ecb8950695e907ed25acffec9e98c6806e311c8 Mon Sep 17 00:00:00 2001 From: Zachary Amsden Date: Thu, 7 Dec 2006 02:14:09 +0100 Subject: [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 Signed-off-by: Andi Kleen Cc: Andi Kleen Cc: Jeremy Fitzhardinge Cc: Chris Wright Signed-off-by: Andrew Morton --- include/asm-i386/pgtable.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/asm-i386/pgtable.h') diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index 04dd39b973a..b4a301f647b 100644 --- a/include/asm-i386/pgtable.h +++ b/include/asm-i386/pgtable.h @@ -326,6 +326,14 @@ do { \ __young; \ }) +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR +static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ + pte_t pte = raw_ptep_get_and_clear(ptep); + pte_update(mm, addr, ptep); + return pte; +} + #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full) { -- cgit v1.2.3-70-g09d2