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Commit 1891172a authored by Richard Cochran's avatar Richard Cochran Committed by David S. Miller
Browse files

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: default avatarRichard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b422da7c

include/linux/timecounter.h

+4 −1
Original line number Diff line number Diff line
@@ -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)

 */