find_memory_block
mem_block = find_memory_block(section_nr);
mem = find_memory_block(pfn_to_section_nr(PFN_DOWN(addr)));
mem = find_memory_block(pfn_to_section_nr(PFN_DOWN(addr)));
mem = find_memory_block(pfn_to_section_nr(PFN_DOWN(sclp_mem->id * block_size)));
extern struct memory_block *find_memory_block(unsigned long section_nr);
mem = find_memory_block(pfn_to_section_nr(PFN_DOWN(cur_start)));