1. 根目录:
2. arch
3. arm
4. include
5. asm
6. dma-contiguous.h

#ifndef ASMARM_DMA_CONTIGUOUS_H
#define ASMARM_DMA_CONTIGUOUS_H

#ifdef __KERNEL__
#ifdef CONFIG_CMA

#include <linux/types.h>
#include <asm-generic/dma-contiguous.h>

void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size);

#endif
#endif

#endif