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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2011-03-23 16:42:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 19:46:22 -0700
commit56039efa18f2530fc23e8ef19e716b65ee2a1d1e (patch)
treea61cbd2f760e93363657622de2cd1591db028458 /mm/swapfile.c
parent6c191cd01a935e5b53ef43c9403c771bb7a32b60 (diff)
downloadlinux-56039efa18f2530fc23e8ef19e716b65ee2a1d1e.tar.gz
memcg: fix ugly initialization of return value is in caller
Remove initialization of vaiable in caller of memory cgroup function. Actually, it's return value of memcg function but it's initialized in caller. Some memory cgroup uses following style to bring the result of start function to the end function for avoiding races. mem_cgroup_start_A(&(*ptr)) /* Something very complicated can happen here. */ mem_cgroup_end_A(*ptr) In some calls, *ptr should be initialized to NULL be caller. But it's ugly. This patch fixes that *ptr is initialized by _start function. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 71b42ec55b7..039e6167763 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -880,7 +880,7 @@ unsigned int count_swap_pages(int type, int free)
static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, swp_entry_t entry, struct page *page)
{
- struct mem_cgroup *ptr = NULL;
+ struct mem_cgroup *ptr;
spinlock_t *ptl;
pte_t *pte;
int ret = 1;