linux-kernel - [PATCH net-next 1/7] timecounter: provide a macro to initialize the cyclecounter mask field.

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Date:	Thu,  1 Jan 2015 11:39:55 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	<netdev@...r.kernel.org>
Cc:	<linux-kernel@...r.kernel.org>, David Miller <davem@...emloft.net>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH net-next 1/7] timecounter: provide a macro to initialize the cyclecounter mask field.

There is no need for users of the timecounter/cyclecounter code to include
clocksource.h just for a single macro.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 include/linux/timecounter.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/timecounter.h b/include/linux/timecounter.h
index 74f4549..4382035 100644
--- a/include/linux/timecounter.h
+++ b/include/linux/timecounter.h
@@ -19,6 +19,9 @@
 
 #include <linux/types.h>
 
+/* simplify initialization of mask field */
+#define CYCLECOUNTER_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
+
 /**
  * struct cyclecounter - hardware abstraction for a free running counter
  *	Provides completely state-free accessors to the underlying hardware.
@@ -29,7 +32,7 @@
  * @read:		returns the current cycle value
  * @mask:		bitmask for two's complement
  *			subtraction of non 64 bit counters,
- *			see CLOCKSOURCE_MASK() helper macro
+ *			see CYCLECOUNTER_MASK() helper macro
  * @mult:		cycle to nanosecond multiplier
  * @shift:		cycle to nanosecond divisor (power of two)
  */
-- 
1.7.10.4

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