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-rw-r--r--kernel/time/timekeeping_internal.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h
index 4ea005a7f..5be76270e 100644
--- a/kernel/time/timekeeping_internal.h
+++ b/kernel/time/timekeeping_internal.h
@@ -17,7 +17,11 @@ static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
{
cycle_t ret = (now - last) & mask;
- return (s64) ret > 0 ? ret : 0;
+ /*
+ * Prevent time going backwards by checking the MSB of mask in
+ * the result. If set, return 0.
+ */
+ return ret & ~(mask >> 1) ? 0 : ret;
}
#else
static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
@@ -26,4 +30,6 @@ static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
}
#endif
+extern time64_t __ktime_get_real_seconds(void);
+
#endif /* _TIMEKEEPING_INTERNAL_H */