timekeeping: Introduce read_boot_clock

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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>

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Martin Schwidefsky 2009-08-14 15:47:32 +02:00 • committed by Thomas Gleixner

parent d4f587c67f

commit 23970e389e

3 changed files with 28 additions and 14 deletions

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17

arch/s390/kernel/time.c

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1

include/linux/time.h

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24

kernel/time/timekeeping.c

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