linux-kernel - Re: [RESEND PATCH v2 3/9] x86, dma: Support allocate memory from bottom upwards in dma_contiguous

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Date:	Fri, 13 Sep 2013 15:47:32 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tj@...nel.org, rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de,
	mingo@...e.hu, hpa@...or.com, akpm@...ux-foundation.org,
	trenn@...e.de, yinghai@...nel.org, jiang.liu@...wei.com,
	wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-acpi@...r.kernel.org
Subject: Re: [RESEND PATCH v2 3/9] x86, dma: Support allocate memory from
 bottom upwards in dma_contiguous_reserve().

On Fri, 2013-09-13 at 11:36 +0800, Tang Chen wrote:
> Hi Toshi,
> 
> On 09/13/2013 03:22 AM, Toshi Kani wrote:
> ......
> >> +		if (memblock_direction_bottom_up()) {
> >> +			addr = memblock_alloc_bottom_up(
> >> +						MEMBLOCK_ALLOC_ACCESSIBLE,
> >> +						limit, size, alignment);
> >> +			if (addr)
> >> +				goto success;
> >> +		}
> >
> > I am afraid that this version went to a wrong direction.  Allocating
> > from the bottom up needs to be an internal logic within the memblock
> > allocator.  It should not require the callers to be aware of the
> > direction and make a special request.
> >
> 
> I think my v1 patch-set was trying to do so. Was it too complicated ?
> 
> So just move this logic to memblock_find_in_range_node(), is this OK ?

Yes, the new version looks good on this.

Thanks,
-Toshi

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