Mask the cycle values before subtraction. So we can use this
validation while the clocksource mask is not 64-bits.
Signed-off-by: Yang Yingliang <yangyingli...@huawei.com>
Cc: Thomas Gleixner <t...@linutronix.de>
---
kernel/time/timekeeping_internal.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/timekeeping_internal.h
b/kernel/time/timekeeping_internal.h
index 4ea005a..984f02e 100644
--- a/kernel/time/timekeeping_internal.h
+++ b/kernel/time/timekeeping_internal.h
@@ -15,7 +15,7 @@ extern void tk_debug_account_sleep_time(struct timespec64 *t);
#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t
mask)
{
- cycle_t ret = (now - last) & mask;
+ cycle_t ret = (now & mask) - (last & mask);
return (s64) ret > 0 ? ret : 0;
}
--
2.5.0
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