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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-12-15 16:04:11 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-12-17 11:09:41 -0300 |
commit | 0389cd1f5fda34c14941c37a39547d16af5d56e2 (patch) | |
tree | 247ed2257e6656420fe7aa6a2f0063de8b6c91a4 /tools/include/linux/log2.h | |
parent | 2dc0b9721956f4314364f68a99d8bef490870438 (diff) | |
download | linux-stable-0389cd1f5fda34c14941c37a39547d16af5d56e2.tar.gz linux-stable-0389cd1f5fda34c14941c37a39547d16af5d56e2.tar.bz2 linux-stable-0389cd1f5fda34c14941c37a39547d16af5d56e2.zip |
tools: Move code originally from linux/log2.h to tools/include/linux/
From tools/perf/util/include/linux, so that it becomes accessible to
other tools/.
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-uqohgzilp3ebd3cbybnf3luc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/include/linux/log2.h')
-rw-r--r-- | tools/include/linux/log2.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tools/include/linux/log2.h b/tools/include/linux/log2.h new file mode 100644 index 000000000000..141b7665d842 --- /dev/null +++ b/tools/include/linux/log2.h @@ -0,0 +1,26 @@ +/* Integer base 2 logarithm calculation + * + * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _TOOLS_LINUX_LOG2_H +#define _TOOLS_LINUX_LOG2_H + +/* + * Determine whether some value is a power of two, where zero is + * *not* considered a power of two. + */ + +static inline __attribute__((const)) +bool is_power_of_2(unsigned long n) +{ + return (n != 0 && ((n & (n - 1)) == 0)); +} + +#endif /* _TOOLS_LINUX_LOG2_H */ |