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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>
This commit is contained in:
Maxime Ripard 2013-02-26 17:51:13 +01:00 committed by Sascha Hauer
parent 91786b5bc8
commit 4f105dd774
1 changed files with 9 additions and 0 deletions
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9
include/linux/log2.h
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@ -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