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kernel/linux-imx6_3.14.28/include/linux/pfn.h 328 Bytes
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  #ifndef _LINUX_PFN_H_
  #define _LINUX_PFN_H_
  
  #ifndef __ASSEMBLY__
  #include <linux/types.h>
  #endif
  
  #define PFN_ALIGN(x)	(((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
  #define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
  #define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
  #define PFN_PHYS(x)	((phys_addr_t)(x) << PAGE_SHIFT)
  
  #endif