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