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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-08-14 15:47:32 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-08-15 10:55:47 +0200 |
| commit | 23970e389e9cee43c4b41023935e1417271708b2 (patch) | |
| tree | d97d299cf74c44cf7ceb4c04c82dafc451fbbfbb /include/linux/time.h | |
| parent | d4f587c67fc39e0030ddd718675e252e208da4d7 (diff) | |
| download | lwn-23970e389e9cee43c4b41023935e1417271708b2.tar.gz lwn-23970e389e9cee43c4b41023935e1417271708b2.zip | |
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.h | 1 |
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); |