get_backing_src_pagesz
u64 backing_src_pagesz = get_backing_src_pagesz(p->src_type);
backing_page_size = get_backing_src_pagesz(src_type);
demand_paging_size = get_backing_src_pagesz(p->src_type);
size_t get_backing_src_pagesz(u32 i);
u64 large_page_size = get_backing_src_pagesz(src_type);
size_t backing_src_pagesz = get_backing_src_pagesz(src_type);
u64 backing_src_pagesz = get_backing_src_pagesz(backing_src);
const size_t alignment = max_t(size_t, SZ_2M, get_backing_src_pagesz(src_type));