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-rw-r--r--mm/ksm.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/mm/ksm.c b/mm/ksm.c
index e2ae0045832..65ab5c7067d 100644
--- 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;
}