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Commit 5b385f25 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

memblock: Introduce for_each_memblock() and new accessors 



Walk memblock's using for_each_memblock() and use memblock_region_base/end_pfn() for
getting to PFNs.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent dbe3039e

include/linux/memblock.h

+52 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ extern int memblock_find(struct memblock_region *res); 


extern void memblock_dump_all(void);



/* Obsolete accessors */

static inline u64

memblock_size_bytes(struct memblock_type *type, unsigned long region_nr)

{
@@ -86,6 +87,57 @@ memblock_end_pfn(struct memblock_type *type, unsigned long region_nr) 
	       memblock_size_pages(type, region_nr);

}



/*

 * pfn conversion functions

 *

 * While the memory MEMBLOCKs should always be page aligned, the reserved

 * MEMBLOCKs may not be. This accessor attempt to provide a very clear

 * idea of what they return for such non aligned MEMBLOCKs.

 */



/**

 * memblock_region_base_pfn - Return the lowest pfn intersecting with the region

 * @reg: memblock_region structure

 */

static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)

{

	return reg->base >> PAGE_SHIFT;

}



/**

 * memblock_region_last_pfn - Return the highest pfn intersecting with the region

 * @reg: memblock_region structure

 */

static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)

{

	return (reg->base + reg->size - 1) >> PAGE_SHIFT;

}



/**

 * memblock_region_end_pfn - Return the pfn of the first page following the region

 *                      but not intersecting it

 * @reg: memblock_region structure

 */

static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)

{

	return memblock_region_last_pfn(reg) + 1;

}



/**

 * memblock_region_pages - Return the number of pages covering a region

 * @reg: memblock_region structure

 */

static inline unsigned long memblock_region_pages(const struct memblock_region *reg)

{

	return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);

}



#define for_each_memblock(memblock_type, region)					\

	for (region = memblock.memblock_type.regions;				\

	     region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);	\

	     region++)





#endif /* __KERNEL__ */



#endif /* _LINUX_MEMBLOCK_H */