From 8d8b97ba499cb69fccb5fd9f2b439e3265fc3f27 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 19 Apr 2013 23:11:24 -0400
Subject: [PATCH] take cgroup_open() and cpuset_open() to fs/proc/base.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/proc/base.c         | 31 +++++++++++++++++++++++++++++++
 include/linux/cgroup.h |  2 +-
 include/linux/cpuset.h |  3 +--
 kernel/cgroup.c        | 15 +--------------
 kernel/cpuset.c        | 15 +--------------
 5 files changed, 35 insertions(+), 31 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index f2637c972160..8281986693be 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -404,6 +404,37 @@ static const struct file_operations proc_lstats_operations = {
 
 #endif
 
+#ifdef CONFIG_CGROUPS
+static int cgroup_open(struct inode *inode, struct file *file)
+{
+	struct pid *pid = PROC_I(inode)->pid;
+	return single_open(file, proc_cgroup_show, pid);
+}
+
+static const struct file_operations proc_cgroup_operations = {
+	.open		= cgroup_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+#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 task_struct *task, char *buffer)
 {
 	unsigned long totalpages = totalram_pages + total_swap_pages;
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 900af5964f55..68f2157b71d4 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -42,7 +42,7 @@ extern int cgroupstats_build(struct cgroupstats *stats,
 extern int cgroup_load_subsys(struct cgroup_subsys *ss);
 extern void cgroup_unload_subsys(struct cgroup_subsys *ss);
 
-extern const struct file_operations proc_cgroup_operations;
+extern int proc_cgroup_show(struct seq_file *, void *);
 
 /* Define the enumeration of all builtin cgroup subsystems */
 #define SUBSYS(_x) _x ## _subsys_id,
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 8c8a60d29407..22b637c5ecae 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -64,10 +64,9 @@ extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 extern int cpuset_memory_pressure_enabled;
 extern void __cpuset_memory_pressure_bump(void);
 
-extern const struct file_operations proc_cpuset_operations;
-struct seq_file;
 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 cpuset_mem_spread_node(void);
 extern int cpuset_slab_spread_node(void);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a32f9432666c..d5cffe80b469 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4769,7 +4769,7 @@ out:
  */
 
 /* TODO: Use a proper seq_file iterator */
-static int proc_cgroup_show(struct seq_file *m, void *v)
+int proc_cgroup_show(struct seq_file *m, void *v)
 {
 	struct pid *pid;
 	struct task_struct *tsk;
@@ -4821,19 +4821,6 @@ out:
 	return retval;
 }
 
-static int cgroup_open(struct inode *inode, struct file *file)
-{
-	struct pid *pid = PROC_I(inode)->pid;
-	return single_open(file, proc_cgroup_show, pid);
-}
-
-const struct file_operations proc_cgroup_operations = {
-	.open		= cgroup_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
 /* Display information about each subsystem and each hierarchy */
 static int proc_cgroupstats_show(struct seq_file *m, void *v)
 {
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 4f9dfe43ecbd..1b6f615be587 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2666,7 +2666,7 @@ void __cpuset_memory_pressure_bump(void)
  *    and we take cpuset_mutex, keeping cpuset_attach() from changing it
  *    anyway.
  */
-static int proc_cpuset_show(struct seq_file *m, void *unused_v)
+int proc_cpuset_show(struct seq_file *m, void *unused_v)
 {
 	struct pid *pid;
 	struct task_struct *tsk;
@@ -2700,19 +2700,6 @@ out_free:
 out:
 	return retval;
 }
-
-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);
-}
-
-const struct file_operations proc_cpuset_operations = {
-	.open		= cpuset_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
 #endif /* CONFIG_PROC_PID_CPUSET */
 
 /* Display task mems_allowed in /proc/<pid>/status file. */
-- 
2.20.1