cpuset: simplify proc_cpuset_show()
Use the ONE macro instead of REG, and we can simplify proc_cpuset_show().
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 22874d7..a37f4ed 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2729,10 +2729,9 @@
* and we take cpuset_mutex, keeping cpuset_attach() from changing it
* anyway.
*/
-int proc_cpuset_show(struct seq_file *m, void *unused_v)
+int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *tsk)
{
- struct pid *pid;
- struct task_struct *tsk;
char *buf, *p;
struct cgroup_subsys_state *css;
int retval;
@@ -2742,24 +2741,16 @@
if (!buf)
goto out;
- retval = -ESRCH;
- pid = m->private;
- tsk = get_pid_task(pid, PIDTYPE_PID);
- if (!tsk)
- goto out_free;
-
retval = -ENAMETOOLONG;
rcu_read_lock();
css = task_css(tsk, cpuset_cgrp_id);
p = cgroup_path(css->cgroup, buf, PATH_MAX);
rcu_read_unlock();
if (!p)
- goto out_put_task;
+ goto out_free;
seq_puts(m, p);
seq_putc(m, '\n');
retval = 0;
-out_put_task:
- put_task_struct(tsk);
out_free:
kfree(buf);
out: