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dma/direct: turn ARCH_ZONE_DMA_BITS into a variable

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Some architectures, notably ARM, are interested in tweaking this
depending on their runtime DMA addressing limitations.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Nicolas Saenz Julienne
2019-10-14 20:31:03 +02:00
committed by Catalin Marinas
parent 4686da5140
commit 8b5369ea58
8 changed files with 31 additions and 27 deletions
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9
arch/powerpc/include/asm/page.h
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@@ -329,13 +329,4 @@ struct vm_area_struct;
#endif /* __ASSEMBLY__ */
#include <asm/slice.h>
/*
* Allow 30-bit DMA for very limited Broadcom wifi chips on many powerbooks.
*/
#ifdef CONFIG_PPC32
#define ARCH_ZONE_DMA_BITS 30
#else
#define ARCH_ZONE_DMA_BITS 31
#endif
#endif /* _ASM_POWERPC_PAGE_H */