最近将Ubuntu升级到9.10版本后，重新生成了2.6.31版本的内核树，没想到编译scull模块时出现新的error
error: 'struct task_struct' has no member named 'uid'
error: 'struct task_struct' has no member named 'euid'
struct task_struct定义在include/linux/sched.h中，原来task_struct结构体定义有所改动，将uid和euid等挪到cred中，见include/linux/sched.h和include/linux/cred.h。
因此只需要将报error的代码做如下修改
current->uid 修改为 current->cred->uid
current->euid 修改为 current->cred->euid