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author | Sascha Hauer <s.hauer@pengutronix.de> | 2016-01-11 13:11:07 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2016-01-11 13:11:07 +0100 |
commit | 70ef1cef5c1a03a4b130f3916d47c3076880b5d6 (patch) | |
tree | cc0faaf8e07a08600f9b958850d7f7669c0ae02d /include/linux/log2.h | |
parent | e64f16cf34175d9e662edfaa02bc7895c1b50b96 (diff) | |
parent | 9e617362fc300d31a4e7f6c5b72781b58c03f78a (diff) | |
download | barebox-70ef1cef5c1a03a4b130f3916d47c3076880b5d6.tar.gz barebox-70ef1cef5c1a03a4b130f3916d47c3076880b5d6.tar.xz |
Merge branch 'for-next/pstore'
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 d9913f06bd..36519e3aa3 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -63,6 +63,15 @@ unsigned long __roundup_pow_of_two(unsigned long n) return 1UL << fls(n - 1); } +/* + * round down to nearest power of two + */ +static inline __attribute__((const)) +unsigned long __rounddown_pow_of_two(unsigned long n) +{ + return 1UL << (fls_long(n) - 1); +} + /** * ilog2 - log of base 2 of 32-bit or a 64-bit unsigned value * @n - parameter |