| /* 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 */ |