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authorLi Zefan <lizf@cn.fujitsu.com>2011-03-23 16:42:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 19:46:34 -0700
commitc8163ca8afcac0fc54593fc60d1e1110edbd0eb2 (patch)
tree55a363ed73b91d8350d2df7083abf49c5c97b20d /kernel/cpuset.c
parent9303e0c4814d2a6afca878cc35433291e862169c (diff)
downloadop-kernel-dev-c8163ca8afcac0fc54593fc60d1e1110edbd0eb2.zip
op-kernel-dev-c8163ca8afcac0fc54593fc60d1e1110edbd0eb2.tar.gz
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 <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 4683fe7..7f384f4 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);
}
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