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>

1 files changed, 2 insertions, 4 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index d753837cca33..dbef832e5e2d 100644
--- 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);
         }