linux-kernel - Re: [PATCH 15/35] x86: make 64 bit use early

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Message-ID: <4B71D580.805@kernel.org>
Date:	Tue, 09 Feb 2010 13:37:04 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [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@...nel.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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