linux-kernel - Re: [PATCH v2 1/1] block: blk-merge: don't merge the pages with non-contiguous descriptors

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Message-ID: <20130116231857.GU2668@htj.dyndns.org>
Date:	Wed, 16 Jan 2013 15:18:57 -0800
From:	Tejun Heo <tj@...nel.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Subhash Jadavani <subhashj@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	martin.petersen@...cle.com, asias@...hat.com,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH v2 1/1] block: blk-merge: don't merge the pages with
 non-contiguous descriptors

On Wed, Jan 16, 2013 at 10:32:35AM +0000, James Bottomley wrote:
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 6b2fb87..ab88c5b 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -809,7 +809,7 @@ static void dma_cache_maint_page(struct page *page, unsigned long offset,
>  			op(vaddr, len, dir);
>  		}
>  		offset = 0;
> -		page++;
> +		page = pfn_to_page(page_to_pfn(page) + 1);

Probably page = nth_page(page, 1) is the better form.

Thanks.

-- 
tejun
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