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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-08-14 15:47:32 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-15 10:55:47 +0200
commit23970e389e9cee43c4b41023935e1417271708b2 (patch)
treed97d299cf74c44cf7ceb4c04c82dafc451fbbfbb /include/linux/time.h
parentd4f587c67fc39e0030ddd718675e252e208da4d7 (diff)
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timekeeping: Introduce read_boot_clock
Add the new function read_boot_clock to get the exact time the system has been started. For architectures without support for exact boot time a new weak function is added that returns 0. Use the exact boot time to initialize wall_to_monotonic, or xtime if the read_boot_clock returned 0. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Daniel Walker <dwalker@fifo99.com> LKML-Reference: <20090814134811.296703241@de.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/time.h')
-rw-r--r--include/linux/time.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h
index 53a3216f0d1b..f505988398e6 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -102,6 +102,7 @@ extern struct timespec wall_to_monotonic;
extern seqlock_t xtime_lock;
extern void read_persistent_clock(struct timespec *ts);
+extern void read_boot_clock(struct timespec *ts);
extern int update_persistent_clock(struct timespec now);
extern int no_sync_cmos_clock __read_mostly;
void timekeeping_init(void);