cregit-Linux how code gets into the kernel

Release 4.12 include/asm-generic/dma.h


 * This file traditionally describes the i8237 PC style DMA controller.
 * Most architectures don't have these any more and can get the minimal
 * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
 * Some code relies on seeing MAX_DMA_ADDRESS though.


extern int request_dma(unsigned int dmanr, const char *device_id);
extern void free_dma(unsigned int dmanr);

#endif /* __ASM_GENERIC_DMA_H */

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