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Signed-off-by: Wei Yang --- include/linux/memblock.h | 1 + mm/memblock.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 40c62aca36ec..7d1c32b3dc12 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -486,6 +486,7 @@ static inline __init_memblock bool memblock_bottom_up(void) phys_addr_t memblock_phys_mem_size(void); phys_addr_t memblock_reserved_size(void); +unsigned long memblock_estimated_nr_pages(void); phys_addr_t memblock_start_of_DRAM(void); phys_addr_t memblock_end_of_DRAM(void); void memblock_enforce_memory_limit(phys_addr_t memory_limit); diff --git a/mm/memblock.c b/mm/memblock.c index e81fb68f7f88..c1f1aac0459f 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1729,6 +1729,25 @@ phys_addr_t __init_memblock memblock_reserved_size(void) return memblock.reserved.total_size; } +/** + * memblock_estimated_nr_pages - return number of pages from memblock point of + * view + * + * During bootup, system may need number of pages in the whole system to do + * some calculation before all pages are freed to buddy system, especially + * when CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled. + * + * At this point, we can get this information from memblock. Since the system + * state is not settle down and address alignment, the value is an estimation. + * + * Return: + * An estimated number of pages from memblock point of view. + */ +unsigned long __init memblock_estimated_nr_pages(void) +{ + return PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size()); +} + /* lowest address */ phys_addr_t __init_memblock memblock_start_of_DRAM(void) { -- 2.34.1