max_pfn is uesd to get the highest pfn in the system. Drivers like drivers/iommu/mtk_iommu.c checks max_pfn to see if it should enable its "4GB mode". This patch exports the max_pfn symbol, so we can build the driver as a kernel module. Signed-off-by: Miles Chen <miles.chen@xxxxxxxxxxxx> --- mm/memblock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memblock.c b/mm/memblock.c index c79ba6f9920c..3b2b21ecebb6 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -99,6 +99,7 @@ EXPORT_SYMBOL(contig_page_data); unsigned long max_low_pfn; unsigned long min_low_pfn; unsigned long max_pfn; +EXPORT_SYMBOL(max_pfn); unsigned long long max_possible_pfn; static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock; -- 2.18.0
