ARCH_PFN_OFFSET 8 include/asm-generic/memory_model.h #ifndef ARCH_PFN_OFFSET ARCH_PFN_OFFSET 30 include/asm-generic/memory_model.h #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) ARCH_PFN_OFFSET 32 include/asm-generic/memory_model.h ARCH_PFN_OFFSET) ARCH_PFN_OFFSET 3521 mm/page_alloc.c mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);