linux-kernel - Re: [PATCH v2 05/10] DMA, CMA: support arbitrary bitmap granularity

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Message-ID: <20140612074140.GA20199@js1304-P5Q-DELUXE>
Date:	Thu, 12 Jun 2014 16:41:40 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	kvm@...r.kernel.org, linux-mm@...ck.org,
	Gleb Natapov <gleb@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Graf <agraf@...e.de>, kvm-ppc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 05/10] DMA, CMA: support arbitrary bitmap granularity

On Thu, Jun 12, 2014 at 04:08:11PM +0900, Minchan Kim wrote:
> On Thu, Jun 12, 2014 at 12:21:42PM +0900, Joonsoo Kim wrote:
> > ppc kvm's cma region management requires arbitrary bitmap granularity,
> > since they want to reserve very large memory and manage this region
> > with bitmap that one bit for several pages to reduce management overheads.
> > So support arbitrary bitmap granularity for following generalization.
> > 
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> Acked-by: Minchan Kim <minchan@...nel.org>
> 

Thanks.

[snip...]
> >  /**
> >   * dma_alloc_from_contiguous() - allocate pages from contiguous area
> >   * @dev:   Pointer to device for which the allocation is performed.
> > @@ -345,7 +372,8 @@ static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count)
> >  static struct page *__dma_alloc_from_contiguous(struct cma *cma, int count,
> >  				       unsigned int align)
> >  {
> > -	unsigned long mask, pfn, pageno, start = 0;
> > +	unsigned long mask, pfn, start = 0;
> > +	unsigned long bitmap_maxno, bitmapno, nr_bits;
> 
> Just Nit: bitmap_maxno, bitmap_no or something consistent.
> I know you love consistent when I read description in first patch
> in this patchset. ;-)

Yeah, I will fix it. :)

Thanks.
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