Re: dma_get_required_mask tidyups

[Christoph Hellwig]

Any comments?  I have a a few things piled up that base on this, so
some forward progress would be great.

On Mon, Sep 10, 2018 at 08:13:29AM +0200, Christoph Hellwig wrote:
> Hi all,
> 
> the dma_get_required_mask dma API implementation has always been a little
> odd, in that we by default don't wire it up struct dma_map_ops, but
> instead hard code a default implementation.  powerpc and ia64 override
> this default and either call a method or otherwise duplicate the default.
> 
> This series always enabled the method and just falls back to the previous
> default implementation when it is not available, as well as fixing up
> a few bits in the default implementations.  This already allows removing
> the ia64 override of the implementation, and will also allow to remove
> the powerpc one together with a few additional cleanups in the powerpc
> code, but those will be sent separately with other powerpc DMA API
> patches.  Last but not least the method will allow us to return a more
> sensible value for typical iommu dma_ops eventually, but that is left
> to another series as well.
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