[PATCH v2] clocksource: Remove unused clocksource_change_rating

[linux@treblig.org]

From: "Dr. David Alan Gilbert" <linux@treblig.org>

clocksource_change_rating() has been unused since 2017's commit
63ed4e0c67df ("Drivers: hv: vmbus: Consolidate all Hyper-V specific clocksource code")

Remove it.

__clocksource_change_rating now only has one use which is ifdef'd.
Move it into the ifdef'd section.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
---
 include/linux/clocksource.h |  1 -
 kernel/time/clocksource.c   | 38 +++++++++----------------------------
 2 files changed, 9 insertions(+), 30 deletions(-)

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index d35b677b08fe..ef1b16da6ad5 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -215,7 +215,6 @@ static inline s64 clocksource_cyc2ns(u64 cycles, u32 mult, u32 shift)
 
 extern int clocksource_unregister(struct clocksource*);
 extern void clocksource_touch_watchdog(void);
-extern void clocksource_change_rating(struct clocksource *cs, int rating);
 extern void clocksource_suspend(void);
 extern void clocksource_resume(void);
 extern struct clocksource * __init clocksource_default_clock(void);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 23336eecb4f4..63564339b7a9 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -20,6 +20,8 @@
 #include "tick-internal.h"
 #include "timekeeping_internal.h"
 
+static void clocksource_enqueue(struct clocksource *cs);
+
 static noinline u64 cycles_to_nsec_safe(struct clocksource *cs, u64 start, u64 end)
 {
 	u64 delta = clocksource_delta(end, start, cs->mask);
@@ -171,7 +173,6 @@ static inline void clocksource_watchdog_unlock(unsigned long *flags)
 }
 
 static int clocksource_watchdog_kthread(void *data);
-static void __clocksource_change_rating(struct clocksource *cs, int rating);
 
 static void clocksource_watchdog_work(struct work_struct *work)
 {
@@ -191,6 +192,13 @@ static void clocksource_watchdog_work(struct work_struct *work)
 	kthread_run(clocksource_watchdog_kthread, NULL, "kwatchdog");
 }
 
+static void __clocksource_change_rating(struct clocksource *cs, int rating)
+{
+	list_del(&cs->list);
+	cs->rating = rating;
+	clocksource_enqueue(cs);
+}
+
 static void __clocksource_unstable(struct clocksource *cs)
 {
 	cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
@@ -1255,34 +1263,6 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
 }
 EXPORT_SYMBOL_GPL(__clocksource_register_scale);
 
-static void __clocksource_change_rating(struct clocksource *cs, int rating)
-{
-	list_del(&cs->list);
-	cs->rating = rating;
-	clocksource_enqueue(cs);
-}
-
-/**
- * clocksource_change_rating - Change the rating of a registered clocksource
- * @cs:		clocksource to be changed
- * @rating:	new rating
- */
-void clocksource_change_rating(struct clocksource *cs, int rating)
-{
-	unsigned long flags;
-
-	mutex_lock(&clocksource_mutex);
-	clocksource_watchdog_lock(&flags);
-	__clocksource_change_rating(cs, rating);
-	clocksource_watchdog_unlock(&flags);
-
-	clocksource_select();
-	clocksource_select_watchdog(false);
-	clocksource_suspend_select(false);
-	mutex_unlock(&clocksource_mutex);
-}
-EXPORT_SYMBOL(clocksource_change_rating);
-
 /*
  * Unbind clocksource @cs. Called with clocksource_mutex held
  */
-- 
2.47.0