[PATCH 08/14] hung task,sysctl: remove proc input checks out of sysctl handlers

[Sasha Levin <levinsasha928@xxxxxxxxx>]

Simplify sysctl handler by removing user input checks and using the callback
provided by the sysctl table.

Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
 include/linux/sched.h |    4 +---
 kernel/hung_task.c    |   14 ++------------
 kernel/sysctl.c       |    3 ++-
 3 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 22e3768..f148b98 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -334,9 +334,7 @@ extern unsigned int  sysctl_hung_task_panic;
 extern unsigned long sysctl_hung_task_check_count;
 extern unsigned long sysctl_hung_task_timeout_secs;
 extern unsigned long sysctl_hung_task_warnings;
-extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
-					 void __user *buffer,
-					 size_t *lenp, loff_t *ppos);
+extern int proc_dohung_task_timeout_secs(void);
 #else
 /* Avoid need for ifdefs elsewhere in the code */
 enum { sysctl_hung_task_timeout_secs = 0 };
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 6df6149..5c67710 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -181,21 +181,11 @@ static unsigned long timeout_jiffies(unsigned long timeout)
 /*
  * Process updating of timeout sysctl
  */
-int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
-				  void __user *buffer,
-				  size_t *lenp, loff_t *ppos)
+int proc_dohung_task_timeout_secs(void)
 {
-	int ret;
-
-	ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
-
-	if (ret || !write)
-		goto out;
-
 	wake_up_process(watchdog_task);
 
- out:
-	return ret;
+	return 0;
 }
 
 /*
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2fac00a..16252c9 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -899,7 +899,8 @@ static struct ctl_table kern_table[] = {
 		.data		= &sysctl_hung_task_timeout_secs,
 		.maxlen		= sizeof(unsigned long),
 		.mode		= 0644,
-		.proc_handler	= proc_dohung_task_timeout_secs,
+		.proc_handler	= proc_doulongvec_minmax,
+		.callback	= proc_dohung_task_timeout_secs,
 	},
 	{
 		.procname	= "hung_task_warnings",
-- 
1.7.8.5

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