https://github.com/torvalds/linux
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Tip revision: 959f58544b7f20c92d5eb43d1232c96c15c01bfb authored by Linus Torvalds on 27 October 2013, 23:12:03 UTC
Linux 3.12-rc7
Tip revision: 959f585
dma.h
#ifndef __ASM_GENERIC_DMA_H
#define __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.
 */
#define MAX_DMA_ADDRESS PAGE_OFFSET

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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