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authorIngo Molnar <mingo@elte.hu>2008-06-25 12:27:29 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-25 12:27:29 +0200
commit5ce001b0e56638c726270d4f9e05d46d4250dfbb (patch)
treec21cf007ddef99d5e8b23dde9621bd9152e676a8 /arch/um/os-Linux/time.c
parent7c9f8861e6c9c839f913e49b98c3854daca18f27 (diff)
parent543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff)
Merge branch 'linus' into stackprotectortip-stackprotector-2008-06-25_10.27_Wed
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 });