From 05e7ff7da78bad3edc1290ed86b4a37da72ced62 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 11 Sep 2009 10:28:31 +0200 Subject: [S390] introduce get_clock_monotonic Introduce get_clock_monotonic() function which can be used to get a (fast) timestamp. Resolution is the same as for get_clock(). The only difference is that the timestamps are monotonic and don't jump backward or forward. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/timex.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h index cc21e3e20fd..24aa1cda20a 100644 --- a/arch/s390/include/asm/timex.h +++ b/arch/s390/include/asm/timex.h @@ -90,4 +90,18 @@ unsigned long long monotonic_clock(void); extern u64 sched_clock_base_cc; +/** + * get_clock_monotonic - returns current time in clock rate units + * + * The caller must ensure that preemption is disabled. + * The clock and sched_clock_base get changed via stop_machine. + * Therefore preemption must be disabled when calling this + * function, otherwise the returned value is not guaranteed to + * be monotonic. + */ +static inline unsigned long long get_clock_monotonic(void) +{ + return get_clock_xt() - sched_clock_base_cc; +} + #endif -- cgit