nouveau: simplify nouveau_dmem_migrate_to_ram
Factor the main copy page to ram routine out into a helper that acts on a single page and which doesn't require the nouveau_dmem_fault structure for argument passing. Also remove the loop over multiple pages as we only handle one at the moment, although the structure of the main worker function makes it relatively easy to add multi page support back if needed in the future. But at least for now this avoid the needed to dynamically allocate memory for the dma addresses in what is essentially the page fault path. Link: https://lore.kernel.org/r/20190814075928.23766-7-hch@lst.de Signed-off-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
Ralph Campbell <rcampbell@nvidia.com> Tested-by:
Ralph Campbell <rcampbell@nvidia.com> Signed-off-by:
Jason Gunthorpe <jgg@mellanox.com>
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