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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 <[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]>
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Original file line number | Diff line number | Diff line change |
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/* Integer base 2 logarithm calculation | ||
* | ||
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. | ||
* Written by David Howells ([email protected]) | ||
* | ||
* 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. | ||
*/ | ||
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#ifndef _TOOLS_LINUX_LOG2_H | ||
#define _TOOLS_LINUX_LOG2_H | ||
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/* | ||
* Determine whether some value is a power of two, where zero is | ||
* *not* considered a power of two. | ||
*/ | ||
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static inline __attribute__((const)) | ||
bool is_power_of_2(unsigned long n) | ||
{ | ||
return (n != 0 && ((n & (n - 1)) == 0)); | ||
} | ||
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#endif /* _TOOLS_LINUX_LOG2_H */ |
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