linux-kernel - Re: [PATCH 4/7] x86: add alloc_coherent dma

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Date:	Tue, 12 Aug 2008 20:24:56 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	muli@...ibm.com
Subject: Re: [PATCH 4/7] x86: add alloc_coherent dma_ops callback to NOMMU driver

On Tue, Aug 12, 2008 at 05:24:14PM +0200, Joerg Roedel wrote:
> +static void *
> +nommu_alloc_coherent(struct device *hwdev, size_t size,
> +		     dma_addr_t *dma_addr, gfp_t gfp)
> +{
> +	unsigned long dma_mask;
> +	int node;
> +	struct page *page;
> +
> +	if (hwdev->dma_mask == NULL)
> +		return NULL;
> +
> +	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
> +	gfp |= __GFP_ZERO;
> +
> +	dma_mask = hwdev->coherent_dma_mask;
> +	if (!dma_mask)
> +		dma_mask = *(hwdev->dma_mask);
> +
> +	if (dma_mask <= DMA_24BIT_MASK)
> +		gfp |= GFP_DMA;
> +	else if (dma_mask <= DMA_32BIT_MASK)
> +		gfp |= GFP_DMA32;

Argh. But there is a bug in this logic :-(
I fix it and resend.

Joerg

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