diff options
Diffstat (limited to 'mm/memblock.c')
| -rw-r--r-- | mm/memblock.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index 0a77a748a8eb..0389ce5cd281 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1731,6 +1731,23 @@ phys_addr_t __init_memblock memblock_reserved_size(void) return memblock.reserved.total_size; } +/** + * memblock_estimated_nr_free_pages - return estimated number of free pages + * from memblock point of view + * + * During bootup, subsystems might need a rough estimate of the number of free + * pages in the whole system, before precise numbers are available from the + * buddy. Especially with CONFIG_DEFERRED_STRUCT_PAGE_INIT, the numbers + * obtained from the buddy might be very imprecise during bootup. + * + * Return: + * An estimated number of free pages from memblock point of view. + */ +unsigned long __init memblock_estimated_nr_free_pages(void) +{ + return PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size()); +} + /* lowest address */ phys_addr_t __init_memblock memblock_start_of_DRAM(void) { |