Hi Christoph,

On Mon, Mar 16, 2020 at 01:48:50PM +0100, Christoph Hellwig wrote:
> 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?

Yea, ULONG_MAX (saying no limit) sounds good to me.
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