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Commit bd185794 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

tools: Adopt roundup_pow_of_two 

To replace equivalent code used in the mmap_pages command line
parameter handling in tools/perf.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-i44zs02xt4zexfxywpklo7km@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 1be300f4

tools/include/linux/log2.h

+25 −0
Original line number Diff line number Diff line
@@ -47,6 +47,15 @@ bool is_power_of_2(unsigned long n) 
	return (n != 0 && ((n & (n - 1)) == 0));

}



/*

 * round up to nearest power of two

 */

static inline __attribute__((const))

unsigned long __roundup_pow_of_two(unsigned long n)

{

	return 1UL << fls_long(n - 1);

}



/*

 * round down to nearest power of two

 */
@@ -141,6 +150,22 @@ unsigned long __rounddown_pow_of_two(unsigned long n) 
	__ilog2_u64(n)				\

 )



/**

 * roundup_pow_of_two - round the given value up to nearest power of two

 * @n - parameter

 *

 * round the given value up to the nearest power of two

 * - the result is undefined when n == 0

 * - this can be used to initialise global variables from constant data

 */

#define roundup_pow_of_two(n)			\

(						\

	__builtin_constant_p(n) ? (		\

		(n == 1) ? 1 :			\

		(1UL << (ilog2((n) - 1) + 1))	\

				   ) :		\

	__roundup_pow_of_two(n)			\

 )



/**

 * rounddown_pow_of_two - round the given value down to nearest power of two