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>
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006f4ac497
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52de4779f2
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@ -376,22 +376,6 @@ static const struct file_operations proc_lstats_operations = {
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#endif
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#ifdef CONFIG_PROC_PID_CPUSET
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static int cpuset_open(struct inode *inode, struct file *file)
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{
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struct pid *pid = PROC_I(inode)->pid;
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return single_open(file, proc_cpuset_show, pid);
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}
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static const struct file_operations proc_cpuset_operations = {
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.open = cpuset_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task)
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{
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@ -2558,7 +2542,7 @@ static const struct pid_entry tgid_base_stuff[] = {
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REG("latency", S_IRUGO, proc_lstats_operations),
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#endif
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#ifdef CONFIG_PROC_PID_CPUSET
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REG("cpuset", S_IRUGO, proc_cpuset_operations),
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ONE("cpuset", S_IRUGO, proc_cpuset_show),
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#endif
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#ifdef CONFIG_CGROUPS
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ONE("cgroup", S_IRUGO, proc_cgroup_show),
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@ -2904,7 +2888,7 @@ static const struct pid_entry tid_base_stuff[] = {
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REG("latency", S_IRUGO, proc_lstats_operations),
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#endif
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#ifdef CONFIG_PROC_PID_CPUSET
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REG("cpuset", S_IRUGO, proc_cpuset_operations),
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ONE("cpuset", S_IRUGO, proc_cpuset_show),
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#endif
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#ifdef CONFIG_CGROUPS
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ONE("cgroup", S_IRUGO, proc_cgroup_show),
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@ -86,7 +86,8 @@ extern void __cpuset_memory_pressure_bump(void);
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extern void cpuset_task_status_allowed(struct seq_file *m,
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struct task_struct *task);
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extern int proc_cpuset_show(struct seq_file *, void *);
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extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *tsk);
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extern int cpuset_mem_spread_node(void);
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extern int cpuset_slab_spread_node(void);
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@ -2729,10 +2729,9 @@ void __cpuset_memory_pressure_bump(void)
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* and we take cpuset_mutex, keeping cpuset_attach() from changing it
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* anyway.
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*/
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int proc_cpuset_show(struct seq_file *m, void *unused_v)
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int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *tsk)
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{
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struct pid *pid;
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struct task_struct *tsk;
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char *buf, *p;
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struct cgroup_subsys_state *css;
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int retval;
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@ -2742,24 +2741,16 @@ int proc_cpuset_show(struct seq_file *m, void *unused_v)
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if (!buf)
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goto out;
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retval = -ESRCH;
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pid = m->private;
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tsk = get_pid_task(pid, PIDTYPE_PID);
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if (!tsk)
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goto out_free;
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retval = -ENAMETOOLONG;
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rcu_read_lock();
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css = task_css(tsk, cpuset_cgrp_id);
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p = cgroup_path(css->cgroup, buf, PATH_MAX);
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rcu_read_unlock();
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if (!p)
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goto out_put_task;
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goto out_free;
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seq_puts(m, p);
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seq_putc(m, '\n');
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retval = 0;
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out_put_task:
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put_task_struct(tsk);
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out_free:
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kfree(buf);
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out:
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