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SubjectRe: [PATCH 15/35] x86: make 64 bit use early_res instead of bootmem before slab
On 02/09/2010 12:26 PM, Andrew Morton wrote:
> On Tue, 09 Feb 2010 11:32:26 -0800
> Yinghai Lu <yinghai@kernel.org> wrote:
>
>> +u64 __init find_early_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
>> + u64 size, u64 align)
>> +{
>> + u64 addr, last;
>> +
>> + addr = round_up(ei_start, align);
>
> Can we use include/linux/log2.h:roundup_pow_of_two() in this patchset?

no, that is not what we want.


/**
* roundup_pow_of_two - round the given value up to nearest power of two
* @n - parameter
*
* round the given value up to the nearest power of two
* - the result is undefined when n == 0
* - this can be used to initialise global variables from constant data
*/
#define roundup_pow_of_two(n) \
( \
__builtin_constant_p(n) ? ( \
(n == 1) ? 1 : \
(1UL << (ilog2((n) - 1) + 1)) \
) : \
__roundup_pow_of_two(n) \
)

YH


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