do_wp_page can reach the _end callout without passing the _begin callout. This prevents making the _end unles the _begin has also been made.
Index: mmu_notifiers-cl-v5/mm/memory.c =================================================================== --- mmu_notifiers-cl-v5.orig/mm/memory.c 2008-02-01 04:44:03.000000000 -0600 +++ mmu_notifiers-cl-v5/mm/memory.c 2008-02-01 04:46:18.000000000 -0600 @@ -1564,7 +1564,7 @@ static int do_wp_page(struct mm_struct * { struct page *old_page, *new_page; pte_t entry; - int reuse = 0, ret = 0; + int reuse = 0, ret = 0, invalidate_started = 0; int page_mkwrite = 0; struct page *dirty_page = NULL; @@ -1649,6 +1649,8 @@ gotten: mmu_notifier(invalidate_range_begin, mm, address, address + PAGE_SIZE, 0); + invalidate_started = 1; + /* * Re-check the pte - we dropped the lock */ @@ -1687,7 +1689,8 @@ gotten: page_cache_release(old_page); unlock: pte_unmap_unlock(page_table, ptl); - mmu_notifier(invalidate_range_end, mm, + if (invalidate_started) + mmu_notifier(invalidate_range_end, mm, address, address + PAGE_SIZE, 0); if (dirty_page) { if (vma->vm_file) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel