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| author | Tejun Heo <tj@kernel.org> | 2014-02-13 06:58:41 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-13 06:58:41 -0500 |
| commit | 57fce0a68e3aa71d223d9023aae66c7393970c34 (patch) | |
| tree | 73c6e626bbb96e404113ecd81a6de1c6007e2b70 /kernel/cpuset.c | |
| parent | 924f0d9a2078f49ff331bb43196ec5afadc16b8f (diff) | |
| download | linux-57fce0a68e3aa71d223d9023aae66c7393970c34.tar.bz2 | |
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>
Diffstat (limited to 'kernel/cpuset.c')
| -rw-r--r-- | kernel/cpuset.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index bf20e4ac2f75..d8bec21d7a11 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -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); |