linux-kernel - Re: [RFC][PATCH] dma-mapping: align default segment_boundary_mask with dma

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Date:   Mon, 16 Mar 2020 13:48:50 +0100
From:   Christoph Hellwig <hch@....de>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     robin.murphy@....com, m.szyprowski@...sung.com, hch@....de,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [RFC][PATCH] dma-mapping: align default segment_boundary_mask
 with dma_mask

On Fri, Mar 13, 2020 at 05:00:07PM -0700, Nicolin Chen wrote:
> @@ -736,7 +736,7 @@ static inline unsigned long dma_get_seg_boundary(struct device *dev)
>  {
>  	if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
>  		return dev->dma_parms->segment_boundary_mask;
> -	return DMA_BIT_MASK(32);
> +	return (unsigned long)dma_get_mask(dev);

Just thinking out loud after my reply - shouldn't we just return ULONG_MAX
by default here to mark this as no limit?