pcpu_mem_zalloc
pages = pcpu_mem_zalloc(pages_size, GFP_KERNEL);
chunk = pcpu_mem_zalloc(pcpu_chunk_struct_size, gfp);
chunk->alloc_map = pcpu_mem_zalloc(BITS_TO_LONGS(region_bits) *
chunk->bound_map = pcpu_mem_zalloc(BITS_TO_LONGS(region_bits + 1) *
chunk->md_blocks = pcpu_mem_zalloc(pcpu_chunk_nr_blocks(chunk) *
pcpu_mem_zalloc(pcpu_chunk_map_bits(chunk) *