[PATCH 09/14] perf,sysctl: remove proc input checks out of sysctl handlers

[Sasha Levin]

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/perf_event.h |    4 +---
 kernel/events/core.c       |    9 +--------
 kernel/sysctl.c            |    3 ++-
 3 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index ddbb6a9..24c3a54 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1244,9 +1244,7 @@ extern int sysctl_perf_event_paranoid;
 extern int sysctl_perf_event_mlock;
 extern int sysctl_perf_event_sample_rate;
 
-extern int perf_proc_update_handler(struct ctl_table *table, int write,
-		void __user *buffer, size_t *lenp,
-		loff_t *ppos);
+extern int perf_proc_update_handler(void);
 
 static inline bool perf_paranoid_tracepoint_raw(void)
 {
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 32cfc76..94d126f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -167,15 +167,8 @@ int sysctl_perf_event_sample_rate __read_mostly = DEFAULT_MAX_SAMPLE_RATE;
 static int max_samples_per_tick __read_mostly =
 	DIV_ROUND_UP(DEFAULT_MAX_SAMPLE_RATE, HZ);
 
-int perf_proc_update_handler(struct ctl_table *table, int write,
-		void __user *buffer, size_t *lenp,
-		loff_t *ppos)
+int perf_proc_update_handler(void)
 {
-	int ret = proc_dointvec(table, write, buffer, lenp, ppos);
-
-	if (ret || !write)
-		return ret;
-
 	max_samples_per_tick = DIV_ROUND_UP(sysctl_perf_event_sample_rate, HZ);
 
 	return 0;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 16252c9..eef7508 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -977,7 +977,8 @@ static struct ctl_table kern_table[] = {
 		.data		= &sysctl_perf_event_sample_rate,
 		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
 		.mode		= 0644,
-		.proc_handler	= perf_proc_update_handler,
+		.proc_handler	= proc_dointvec,
+		.callback	= perf_proc_update_handler,
 	},
 #endif
 #ifdef CONFIG_KMEMCHECK
-- 
1.7.8.5

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