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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2013-02-26 17:51:13 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2013-02-27 08:59:34 +0100 |
| commit | 4f105dd77466b8504a0b3e78d7ffd6aa6ecd9079 (patch) | |
| tree | 97125722552a576b4ebe7413a70fb2ff660b12ca /include/linux/log2.h | |
| parent | 91786b5bc8e8b8e35a0d8dadfa216163f7f5ac92 (diff) | |
| download | barebox-4f105dd77466b8504a0b3e78d7ffd6aa6ecd9079.tar.gz barebox-4f105dd77466b8504a0b3e78d7ffd6aa6ecd9079.tar.xz | |
log2: Fix declaration of __roundup_pow_of_two
The roundup_pow_of_two function is making use of __roundup_pow_of_two
when the call to __builtin_constant_p fails, which is not implemented in
barebox.
Copied the code from Linux log2.h header.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/linux/log2.h')
| -rw-r--r-- | include/linux/log2.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/log2.h b/include/linux/log2.h index 389043a93c..d9913f06bd 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -54,6 +54,15 @@ bool is_power_of_2(unsigned long n) return (n != 0 && ((n & (n - 1)) == 0)); } +/* + * round up to nearest power of two + */ +static inline __attribute__((const)) +unsigned long __roundup_pow_of_two(unsigned long n) +{ + return 1UL << fls(n - 1); +} + /** * ilog2 - log of base 2 of 32-bit or a 64-bit unsigned value * @n - parameter |