memcg: when do_swap's do_wp_page fails

Don't uncharge when do_swap_page's call to do_wp_page fails: the page which
was charged for is there in the pagetable, and will be correctly uncharged
when that area is unmapped - it was only its COWing which failed.

And while we're here, remove earlier XXX comment: yes, OR in do_wp_page's
return value (maybe VM_FAULT_WRITE) with do_swap_page's there; but if it
fails, mask out success bits, which might confuse some arches e.g.  sparc.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 6 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 7f8c03ec587..0d14d1e58a5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2093,12 +2093,9 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
         unlock_page(page);
 
         if (write_access) {
-                /* XXX: We could OR the do_wp_page code with this one? */
-                if (do_wp_page(mm, vma, address,
-                                page_table, pmd, ptl, pte) & VM_FAULT_OOM) {
-                        mem_cgroup_uncharge_page(page);
-                        ret = VM_FAULT_OOM;
-                }
+                ret |= do_wp_page(mm, vma, address, page_table, pmd, ptl, pte);
+                if (ret & VM_FAULT_ERROR)
+                        ret &= VM_FAULT_ERROR;
                 goto out;
         }