cpuset: remove unnecessary variable in cpuset_attach()

We can just use oldcs->mems_allowed.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index d753837..dbef832 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1407,8 +1407,7 @@ static cpumask_var_t cpus_attach;
 
 static void cpuset_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
 {
-       /* static bufs protected by cpuset_mutex */
-       static nodemask_t cpuset_attach_nodemask_from;
+       /* static buf protected by cpuset_mutex */
        static nodemask_t cpuset_attach_nodemask_to;
        struct mm_struct *mm;
        struct task_struct *task;
@@ -1442,13 +1441,12 @@ static void cpuset_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
         * Change mm, possibly for multiple threads in a threadgroup. This is
         * expensive and may sleep.
         */
-       cpuset_attach_nodemask_from = oldcs->mems_allowed;
        cpuset_attach_nodemask_to = cs->mems_allowed;
        mm = get_task_mm(leader);
        if (mm) {
                mpol_rebind_mm(mm, &cpuset_attach_nodemask_to);
                if (is_memory_migrate(cs))
-                       cpuset_migrate_mm(mm, &cpuset_attach_nodemask_from,
+                       cpuset_migrate_mm(mm, &oldcs->mems_allowed,
                                          &cpuset_attach_nodemask_to);
                mmput(mm);
        }