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cpuset: don't use cgroup_taskset_cur_css() 

cgroup_taskset_cur_css() will be removed during the planned
resturcturing of migration path.  The only use of
cgroup_taskset_cur_css() is finding out the old cgroup_subsys_state of
the leader in cpuset_attach().  This usage can easily be removed by
remembering the old value from cpuset_can_attach().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-02-13 06:58:41 -05:00
parent 924f0d9a20
commit 57fce0a68e
1 changed files with 6 additions and 3 deletions
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9
kernel/cpuset.c
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@ -1379,6 +1379,8 @@ static int fmeter_getrate(struct fmeter *fmp)
return val;
}
static struct cpuset *cpuset_attach_old_cs;
/* Called by cgroups to determine if a cpuset is usable; cpuset_mutex held */
static int cpuset_can_attach(struct cgroup_subsys_state *css,
struct cgroup_taskset *tset)
@ -1387,6 +1389,9 @@ static int cpuset_can_attach(struct cgroup_subsys_state *css,
struct task_struct *task;
int ret;
/* used later by cpuset_attach() */
cpuset_attach_old_cs = task_cs(cgroup_taskset_first(tset));
mutex_lock(&cpuset_mutex);
/*
@ -1450,10 +1455,8 @@ static void cpuset_attach(struct cgroup_subsys_state *css,
struct mm_struct *mm;
struct task_struct *task;
struct task_struct *leader = cgroup_taskset_first(tset);
struct cgroup_subsys_state *oldcss = cgroup_taskset_cur_css(tset,
cpuset_cgrp_id);
struct cpuset *cs = css_cs(css);
struct cpuset *oldcs = css_cs(oldcss);
struct cpuset *oldcs = cpuset_attach_old_cs;
struct cpuset *cpus_cs = effective_cpumask_cpuset(cs);
struct cpuset *mems_cs = effective_nodemask_cpuset(cs);