linux-kernel - Re: [PATCHv4 3/5] common: dma-mapping: Introduce common remapping functions

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Message-ID: <20140718135349.GB4608@arm.com>
Date:	Fri, 18 Jul 2014 14:53:49 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Laura Abbott <lauraa@...eaurora.org>
Cc:	Will Deacon <Will.Deacon@....com>,
	David Riley <davidriley@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ritesh Harjain <ritesh.harjani@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv4 3/5] common: dma-mapping: Introduce common remapping
 functions

On Wed, Jul 02, 2014 at 07:03:36PM +0100, Laura Abbott wrote:
> +void *dma_common_pages_remap(struct page **pages, size_t size,
> +			unsigned long vm_flags, pgprot_t prot,
> +			const void *caller)
> +{
> +	struct vm_struct *area;
> +
> +	area = get_vm_area_caller(size, vm_flags, caller);
> +	if (!area)
> +		return NULL;
> +
> +	if (map_vm_area(area, prot, &pages)) {
> +		vunmap(area->addr);
> +		return NULL;
> +	}
> +
> +	return area->addr;
> +}

Why not just replace this function with vmap()? It is nearly identical.

-- 
Catalin
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