tree d97d299cf74c44cf7ceb4c04c82dafc451fbbfbb
parent d4f587c67fc39e0030ddd718675e252e208da4d7
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1250257652 +0200
committer Thomas Gleixner <tglx@linutronix.de> 1250326547 +0200

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>