Re: [PATCH 0/6] add generic round_up_pow2() macro
From: P
Date: Fri Apr 08 2005 - 05:00:11 EST
Andrew Morton wrote:
Nick Wilson <njw@xxxxxxxx> wrote:
The first patch adds a generic round_up_pow2() macro to kernel.h. The
remaining patches modify a few files to make use of the new macro.
We already have ALIGN() and roundup_pow_of_two().
cool. It doesn't handle x={0,1} though.
Maybe we should have:
static inline unsigned long __attribute_const__
__roundup_pow_of_two(unsigned long x)
{
return (1UL << fls(x - 1));
}
static inline unsigned long __attribute_const__
roundup_pow_of_two(unsigned long x)
{
return (unlikely(x<2)?2:__roundup_pow_of_two(x));
}
--
Pádraig Brady - http://www.pixelbeat.org
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