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-rw-r--r--arch/arm/mach-pxa/generic.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 6ae605857ca9..9de1278d234f 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -76,7 +76,9 @@ unsigned long long sched_clock(void)
/*
* 96-bit math to perform tick * NSEC_PER_SEC / CLOCK_TICK_RATE for
* any value of CLOCK_TICK_RATE. Max value is in the 80 thousand
- * years range which is nice, but with higher computation cost.
+ * years range and truncation to unsigned long long limits it to
+ * sched_clock's max range of ~584 years. This is nice but with
+ * higher computation cost.
*/
{
union {