cregit-Linux how code gets into the kernel

Release 4.10 arch/m32r/include/asm/dma-mapping.h

#ifndef _ASM_M32R_DMA_MAPPING_H

#define _ASM_M32R_DMA_MAPPING_H

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <linux/io.h>


#define DMA_ERROR_CODE (~(dma_addr_t)0x0)


static inline struct dma_map_ops *get_dma_ops(struct device *dev) { if (dev && dev->archdata.dma_ops) return dev->archdata.dma_ops; return &dma_noop_ops; }

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static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { }

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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) { if (!dev->dma_mask) return false; return addr + size - 1 <= *dev->dma_mask; }

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#endif /* _ASM_M32R_DMA_MAPPING_H */

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