[patch 01/11] clocksource: Provide clocksource_arch_init()

Thomas Gleixner
Fri, 14 Sep 2018 12:50:07 -0000

Architectures have extra archdata in the clocksource, e.g. for VDSO
support. There are no sanity checks or general initializations for this
available. Add support for that.

Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
---
 include/linux/clocksource.h |    5 +++++
 kernel/time/Kconfig         |    4 ++++
 kernel/time/clocksource.c   |    2 ++
 3 files changed, 11 insertions(+)

--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -241,6 +241,11 @@ static inline void __clocksource_update_
 	__clocksource_update_freq_scale(cs, 1000, khz);
 }

+#ifdef CONFIG_ARCH_CLOCKSOURCE_INIT
+extern void clocksource_arch_init(struct clocksource *cs);
+#else
+static inline void clocksource_arch_init(struct clocksource *cs) { }
+#endif

 extern int timekeeping_notify(struct clocksource *clock);

--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -12,6 +12,10 @@ config CLOCKSOURCE_WATCHDOG
 config ARCH_CLOCKSOURCE_DATA
 	bool

+# Architecture has extra clocksource init called from registration
+config ARCH_CLOCKSOURCE_INIT
+	bool
+
 # Clocksources require validation of the clocksource against the last
 # cycle update - x86/TSC misfeature
 config CLOCKSOURCE_VALIDATE_LAST_CYCLE
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -937,6 +937,8 @@ int __clocksource_register_scale(struct
 {
 	unsigned long flags;

+	clocksource_arch_init(cs);
+
 	/* Initialize mult/shift and max_idle_ns */
 	__clocksource_update_freq_scale(cs, scale, freq);