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authorIngo Molnar <mingo@elte.hu>2008-06-16 11:16:46 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-16 11:16:46 +0200
commitcb9aa97c21c59ad01c9514d7faf45dc166fba226 (patch)
tree66a530f154db78b85f5b1406ebc51401df8d3913 /arch/um/os-Linux/time.c
parent668a6c3654560aef8741642478973e205a4f02bf (diff)
parent066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff)
Merge branch 'linus' into tracing/mmiotrace-mergefixupstip-tracing-mmiotrace-mergefixups-2008-06-16_09.16_Mon
Diffstat (limited to 'arch/um/os-Linux/time.c')
-rw-r--r--arch/um/os-Linux/time.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index bee98f466d66..dec5678fc17f 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -106,6 +106,10 @@ static void deliver_alarm(void)
unsigned long long this_tick = os_nsecs();
int one_tick = UM_NSEC_PER_SEC / UM_HZ;
+ /* Protection against the host's time going backwards */
+ if ((last_tick != 0) && (this_tick < last_tick))
+ this_tick = last_tick;
+
if (last_tick == 0)
last_tick = this_tick - one_tick;
@@ -148,6 +152,9 @@ static int after_sleep_interval(struct timespec *ts)
start_usecs = usec;
start_usecs -= skew / UM_NSEC_PER_USEC;
+ if (start_usecs < 0)
+ start_usecs = 0;
+
tv = ((struct timeval) { .tv_sec = start_usecs / UM_USEC_PER_SEC,
.tv_usec = start_usecs % UM_USEC_PER_SEC });
interval = ((struct itimerval) { { 0, usec }, tv });