函数逻辑报告

函数名称：xpand (or shrink) an existing mapping, potentially moving it at the same* time (controlled by the MREMAP_MAYMOVE flag and available VM space)* under NOMMU conditions, we only permit changing a mapping's size, and only* as long as it stays within the

函数原型：static unsigned long do_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr)

返回类型：unsigned long

参数：