linux-kernel - [PATCH v3] kernel/time: move timer sysctls to its own file

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Date:   Sun, 30 Jan 2022 23:13:38 +0800
From:   tangmeng <tangmeng@...ontech.com>
To:     tglx@...utronix.de, mcgrof@...nel.org, keescook@...omium.org,
        yzaikin@...gle.com, john.stultz@...aro.org, sboyd@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        tangmeng <tangmeng@...ontech.com>
Subject: [PATCH v3] kernel/time: move timer sysctls to its own file

This moves the kernel/timer/timer.c respective sysctls to its own file.

Signed-off-by: tangmeng <tangmeng@...ontech.com>
---
 include/linux/timer.h |  4 ----
 kernel/sysctl.c       | 11 -----------
 kernel/time/timer.c   | 28 ++++++++++++++++++++++++++--
 3 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/include/linux/timer.h b/include/linux/timer.h
index fda13c9d1256..793b6b7c5a3e 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -198,10 +198,6 @@ extern enum hrtimer_restart it_real_fn(struct hrtimer *);
 
 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
 struct ctl_table;
-
-extern unsigned int sysctl_timer_migration;
-int timer_migration_handler(struct ctl_table *table, int write,
-			    void *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
 unsigned long __round_jiffies(unsigned long j, int cpu);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5ae443b2882e..d6d133423e5d 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2292,17 +2292,6 @@ static struct ctl_table kern_table[] = {
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= SYSCTL_ONE,
 	},
-#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
-	{
-		.procname	= "timer_migration",
-		.data		= &sysctl_timer_migration,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= timer_migration_handler,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_ONE,
-	},
-#endif
 #ifdef CONFIG_BPF_SYSCALL
 	{
 		.procname	= "unprivileged_bpf_disabled",
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 85f1021ad459..f9ae2b4f6326 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -44,6 +44,7 @@
 #include <linux/slab.h>
 #include <linux/compat.h>
 #include <linux/random.h>
+#include <linux/sysctl.h>
 
 #include <linux/uaccess.h>
 #include <asm/unistd.h>
@@ -223,7 +224,7 @@ static void timer_update_keys(struct work_struct *work);
 static DECLARE_WORK(timer_update_work, timer_update_keys);
 
 #ifdef CONFIG_SMP
-unsigned int sysctl_timer_migration = 1;
+static unsigned int sysctl_timer_migration = 1;
 
 DEFINE_STATIC_KEY_FALSE(timers_migration_enabled);
 
@@ -251,7 +252,8 @@ void timers_update_nohz(void)
 	schedule_work(&timer_update_work);
 }
 
-int timer_migration_handler(struct ctl_table *table, int write,
+#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
+static int timer_migration_handler(struct ctl_table *table, int write,
 			    void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int ret;
@@ -264,6 +266,27 @@ int timer_migration_handler(struct ctl_table *table, int write,
 	return ret;
 }
 
+static struct ctl_table timer_sysctl[] = {
+	{
+		.procname       = "timer_migration",
+		.data           = &sysctl_timer_migration,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = timer_migration_handler,
+		.extra1         = SYSCTL_ZERO,
+		.extra2         = SYSCTL_ONE,
+	},
+	{}
+};
+
+static int __init timer_sysctl_init(void)
+{
+	register_sysctl_init("kernel", timer_sysctl);
+	return 0;
+}
+#else
+#define timer_sysctl_init() do { } while (0)
+#endif
 static inline bool is_timers_nohz_active(void)
 {
 	return static_branch_unlikely(&timers_nohz_active);
@@ -2022,6 +2045,7 @@ void __init init_timers(void)
 	init_timer_cpus();
 	posix_cputimers_init_work();
 	open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
+	timer_sysctl_init();
 }
 
 /**
-- 
2.20.1