Add latch for data used by clock read operations. This is in preparation
for the clock latch synchronization scheme. "cycle_last" rely on
timekeeper seqlock synchronization, and will therefore need to be
latched.
Add:
- cycle_last_latch (array of 2 elements),
- read_latch(),
- update_latch().
Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Cc: John Stultz <john.stu...@linaro.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Peter Zijlstra <pet...@infradead.org>
---
include/linux/clocksource.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index dbbf8aa..ef9c2e5 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -180,6 +180,10 @@ struct clocksource {
#ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
struct arch_clocksource_data archdata;
#endif
+ cycle_t (*read_latch)(struct clocksource *cs, int index);
+ void (*update_latch)(struct clocksource *cs, int oldindex,
+ int newindex);
+ cycle_t cycle_last_latch[2];
const char *name;
struct list_head list;
--
1.7.10.4
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