From: Arnaldo Carvalho de Melo <[email protected]> To replace equivalent code used in the mmap_pages command line parameter handling in tools/perf.
Cc: Adrian Hunter <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: David Ahern <[email protected]> Cc: Don Zickus <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/include/linux/log2.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) 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 @@ -48,6 +48,15 @@ bool is_power_of_2(unsigned long n) } /* + * 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 */ static inline __attribute__((const)) @@ -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 -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
