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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-09-11 10:28:31 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-09-11 10:29:42 +0200
commit05e7ff7da78bad3edc1290ed86b4a37da72ced62 (patch)
treef7348a9f4f561a53465abea731c2ef59900fd62f /arch/s390/kernel
parentca99dab01dd63dcc413395bd3e75b0be152dfefc (diff)
[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 <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/time.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index d4c8e9c47c8..54e327e9af0 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -60,6 +60,7 @@
#define TICK_SIZE tick
u64 sched_clock_base_cc = -1; /* Force to data section. */
+EXPORT_SYMBOL_GPL(sched_clock_base_cc);
static DEFINE_PER_CPU(struct clock_event_device, comparators);
@@ -68,7 +69,7 @@ static DEFINE_PER_CPU(struct clock_event_device, comparators);
*/
unsigned long long notrace sched_clock(void)
{
- return ((get_clock_xt() - sched_clock_base_cc) * 125) >> 9;
+ return (get_clock_monotonic() * 125) >> 9;
}
/*