From bd1857948e7667313f9a7bee9b2492c0848174a6 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 16 Dec 2014 13:19:23 -0300 Subject: 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 Cc: Borislav Petkov Cc: David Ahern Cc: Don Zickus Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-i44zs02xt4zexfxywpklo7km@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/include/linux/log2.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'tools/include') diff --git a/tools/include/linux/log2.h b/tools/include/linux/log2.h index 990b138362d6..41446668ccce 100644 --- a/tools/include/linux/log2.h +++ b/tools/include/linux/log2.h @@ -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 -- cgit v1.2.3