linux-kernel - Re: [PATCH 3/6] powerpc: add memory map support to Freescale RapidIO block

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Message-ID: <2a27d3730905210343k1e44225eh5555de768abdbb03@mail.gmail.com>
Date:	Thu, 21 May 2009 18:43:23 +0800
From:	Li Yang <leoli@...escale.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	galak@...nel.crashing.org, davem@...emloft.net,
	mporter@...nel.crashing.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, netdev@...r.kernel.org, zw@...kernel.org
Subject: Re: [PATCH 3/6] powerpc: add memory map support to Freescale RapidIO 
	block

On Wed, May 13, 2009 at 6:05 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Tue, 12 May 2009 16:36:00 +0800
> Li Yang <leoli@...escale.com> wrote:
>
>> +     align = (size < 0x1000) ? 0x1000 : 1 << (__ilog2(size - 1) + 1);
>> +
>> +     /* Align the size */
>> +     if ((lstart + size) > (_ALIGN_DOWN(lstart, align) + align)) {
>
> __ilog2() and _ALIGN_DOWN() are powerpc-specific functions.  It would
> be preferable to use more general helpers if possible.  ALIGN() and ilog2()
> might suit here.

Will change to use ilog2().

_ALIGN_DOWN() gets a lower aligned address while ALIGN() gets a higher
address.  It seems that we don't have a general helper to do the same.

- Leo
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