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authorHugh Dickins <hugh@veritas.com>2008-03-04 14:29:04 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:35:14 -0800
commit61469f1d51777fc3b6d8d70da8373ee77ee13349 (patch)
treecdcde89af7b998c340414f305a2a723106770c17
parent6dbf6d3bb955d5a92005b6ecd6ffad2c5b95b963 (diff)
downloadkernel-61469f1d51777fc3b6d8d70da8373ee77ee13349.tar.gz
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>
-rw-r--r--mm/memory.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 7f8c03ec587c..0d14d1e58a5f 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;
}