函数逻辑报告

函数名称：Get an address range which is currently unmapped.* For shmat() with addr=0.* Ugly calling convention alert:* Return value with the low bits set means error value,* ie* if (ret & ~PAGE_MASK)* error = ret;

函数原型：unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)

返回类型：unsigned long

参数：