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-rw-r--r--include/linux/clocksource.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 5f4a7f72f3e..4bc94282c36 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -65,6 +65,8 @@ struct clocksource {
u64 interval_snsecs;
};
+/* simplify initialization of mask field */
+#define CLOCKSOURCE_MASK(bits) (cycle_t)(bits<64 ? ((1ULL<<bits)-1) : -1)
/**
* clocksource_khz2mult - calculates mult from khz and shift