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memblock: Introduce for_each_memblock() and new accessors

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

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-08-04 13:40:38 +10:00
parent dbe3039e64
commit 5b385f259f
1 changed files with 52 additions and 0 deletions
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52
include/linux/memblock.h
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@ -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 */