Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

[pandora-kernel.git] / mm / ksm.c

diff --git a/mm/ksm.c b/mm/ksm.c
index e2ae004..65ab5c7 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -712,7 +712,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
        if (!ptep)
                goto out;
 
-       if (pte_write(*ptep)) {
+       if (pte_write(*ptep) || pte_dirty(*ptep)) {
                pte_t entry;
 
                swapped = PageSwapCache(page);
@@ -735,7 +735,9 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
                        set_pte_at(mm, addr, ptep, entry);
                        goto out_unlock;
                }
-               entry = pte_wrprotect(entry);
+               if (pte_dirty(entry))
+                       set_page_dirty(page);
+               entry = pte_mkclean(pte_wrprotect(entry));
                set_pte_at_notify(mm, addr, ptep, entry);
        }
        *orig_pte = *ptep;
@@ -1504,8 +1506,6 @@ struct page *ksm_does_need_to_copy(struct page *page,
 {
        struct page *new_page;
 
-       unlock_page(page);      /* any racers will COW it, not modify it */
-
        new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
        if (new_page) {
                copy_user_highpage(new_page, page, address, vma);
@@ -1521,7 +1521,6 @@ struct page *ksm_does_need_to_copy(struct page *page,
                        add_page_to_unevictable_list(new_page);
        }
 
-       page_cache_release(page);
        return new_page;
 }