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cpuset: remove unnecessary variable in cpuset_attach()

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We can just use oldcs->mems_allowed.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan 2013-06-05 17:15:35 +08:00 committed by Tejun Heo
parent 40df2deb50
commit 67bd2c5985
1 changed files with 2 additions and 4 deletions
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6
kernel/cpuset.c
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@ -1407,8 +1407,7 @@ static cpumask_var_t cpus_attach;
static void cpuset_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) static void cpuset_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
{ {
/* static bufs protected by cpuset_mutex */ /* static buf protected by cpuset_mutex */
static nodemask_t cpuset_attach_nodemask_from;
static nodemask_t cpuset_attach_nodemask_to; static nodemask_t cpuset_attach_nodemask_to;
struct mm_struct *mm; struct mm_struct *mm;
struct task_struct *task; 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 * Change mm, possibly for multiple threads in a threadgroup. This is
* expensive and may sleep. * expensive and may sleep.
*/ */
cpuset_attach_nodemask_from = oldcs->mems_allowed;
cpuset_attach_nodemask_to = cs->mems_allowed; cpuset_attach_nodemask_to = cs->mems_allowed;
mm = get_task_mm(leader); mm = get_task_mm(leader);
if (mm) { if (mm) {
mpol_rebind_mm(mm, &cpuset_attach_nodemask_to); mpol_rebind_mm(mm, &cpuset_attach_nodemask_to);
if (is_memory_migrate(cs)) if (is_memory_migrate(cs))
cpuset_migrate_mm(mm, &cpuset_attach_nodemask_from, cpuset_migrate_mm(mm, &oldcs->mems_allowed,
&cpuset_attach_nodemask_to); &cpuset_attach_nodemask_to);
mmput(mm); mmput(mm);
} }