Commit-ID: bd1857948e7667313f9a7bee9b2492c0848174a6 Gitweb: http://git.kernel.org/tip/bd1857948e7667313f9a7bee9b2492c0848174a6 Author: Arnaldo Carvalho de Melo <a...@redhat.com> AuthorDate: Tue, 16 Dec 2014 13:19:23 -0300 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Wed, 17 Dec 2014 11:58:15 -0300
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.hun...@intel.com> Cc: Borislav Petkov <b...@suse.de> Cc: David Ahern <dsah...@gmail.com> Cc: Don Zickus <dzic...@redhat.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Jiri Olsa <jo...@redhat.com> Cc: Mike Galbraith <efa...@gmx.de> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Paul Mackerras <pau...@samba.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stephane Eranian <eran...@google.com> Link: http://lkml.kernel.org/n/tip-i44zs02xt4zexfxywpklo...@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- 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 990b138..4144666 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
