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dma-mapping: make support for dma ops optional

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Avoid the overhead of the dma ops support for tiny builds that only
use the direct mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Christoph Hellwig
2020-07-08 09:30:00 +02:00
parent b417417300
commit 2f9237d4f6
19 changed files with 43 additions and 6 deletions
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3
include/linux/device.h
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@@ -568,8 +568,9 @@ struct device {
#ifdef CONFIG_GENERIC_MSI_IRQ
struct list_head msi_list;
#endif
#ifdef CONFIG_DMA_OPS
const struct dma_map_ops *dma_ops;
#endif
u64 *dma_mask; /* dma mask (if dma'able device) */
u64 coherent_dma_mask;/* Like dma_mask, but for
alloc_coherent mappings as