From c8163ca8afcac0fc54593fc60d1e1110edbd0eb2 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Wed, 23 Mar 2011 16:42:46 -0700 Subject: cpuset: remove unneeded NODEMASK_ALLOC() in cpuset_attach() oldcs->mems_allowed is not modified during cpuset_attach(), so we don't have to copy it to a buffer allocated by NODEMASK_ALLOC(). Just pass it to cpuset_migrate_mm(). Signed-off-by: Li Zefan Cc: Paul Menage Acked-by: David Rientjes Cc: Miao Xie Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/cpuset.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 4683fe728c9b..7f384f4013b2 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1438,10 +1438,9 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont, struct mm_struct *mm; struct cpuset *cs = cgroup_cs(cont); struct cpuset *oldcs = cgroup_cs(oldcont); - NODEMASK_ALLOC(nodemask_t, from, GFP_KERNEL); NODEMASK_ALLOC(nodemask_t, to, GFP_KERNEL); - if (from == NULL || to == NULL) + if (to == NULL) goto alloc_fail; if (cs == &top_cpuset) { @@ -1463,18 +1462,16 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont, } /* change mm; only needs to be done once even if threadgroup */ - *from = oldcs->mems_allowed; *to = cs->mems_allowed; mm = get_task_mm(tsk); if (mm) { mpol_rebind_mm(mm, to); if (is_memory_migrate(cs)) - cpuset_migrate_mm(mm, from, to); + cpuset_migrate_mm(mm, &oldcs->mems_allowed, to); mmput(mm); } alloc_fail: - NODEMASK_FREE(from); NODEMASK_FREE(to); } -- cgit v1.2.3-58-ga151