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Commit 52de4779 authored by Zefan Li's avatar Zefan Li Committed by Tejun Heo
Browse files

cpuset: simplify proc_cpuset_show() 



Use the ONE macro instead of REG, and we can simplify proc_cpuset_show().

Signed-off-by: default avatarZefan Li <lizefan@huawei.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 006f4ac4

fs/proc/base.c

+2 −18
Original line number Diff line number Diff line
@@ -376,22 +376,6 @@ static const struct file_operations proc_lstats_operations = { 


#endif



#ifdef CONFIG_PROC_PID_CPUSET



static int cpuset_open(struct inode *inode, struct file *file)

{

	struct pid *pid = PROC_I(inode)->pid;

	return single_open(file, proc_cpuset_show, pid);

}



static const struct file_operations proc_cpuset_operations = {

	.open		= cpuset_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};

#endif



static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,

			  struct pid *pid, struct task_struct *task)

{
@@ -2558,7 +2542,7 @@ static const struct pid_entry tgid_base_stuff[] = { 
	REG("latency",  S_IRUGO, proc_lstats_operations),

#endif

#ifdef CONFIG_PROC_PID_CPUSET

	REG("cpuset",     S_IRUGO, proc_cpuset_operations),

	ONE("cpuset",     S_IRUGO, proc_cpuset_show),

#endif

#ifdef CONFIG_CGROUPS

	ONE("cgroup",  S_IRUGO, proc_cgroup_show),
@@ -2904,7 +2888,7 @@ static const struct pid_entry tid_base_stuff[] = { 
	REG("latency",  S_IRUGO, proc_lstats_operations),

#endif

#ifdef CONFIG_PROC_PID_CPUSET

	REG("cpuset",    S_IRUGO, proc_cpuset_operations),

	ONE("cpuset",    S_IRUGO, proc_cpuset_show),

#endif

#ifdef CONFIG_CGROUPS

	ONE("cgroup",  S_IRUGO, proc_cgroup_show),

include/linux/cpuset.h

+2 −1
Original line number Diff line number Diff line
@@ -86,7 +86,8 @@ extern void __cpuset_memory_pressure_bump(void); 


extern void cpuset_task_status_allowed(struct seq_file *m,

					struct task_struct *task);

extern int proc_cpuset_show(struct seq_file *, void *);

extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,

			    struct pid *pid, struct task_struct *tsk);



extern int cpuset_mem_spread_node(void);

extern int cpuset_slab_spread_node(void);

kernel/cpuset.c

+3 −12
Original line number Diff line number Diff line
@@ -2729,10 +2729,9 @@ void __cpuset_memory_pressure_bump(void) 
 *    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 @@ int proc_cpuset_show(struct seq_file *m, void *unused_v) 
	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: