1. Undo patch
mv new_filefolder old_filefolder
patch -RE -p0 < filename.patch
eg. $ mv linux-2.6.38.3 linux-2.6.38.3-sys
$ patch -RE -p0 < ltpb_ker.patch
2. 解压缩时候由于系统时间不匹配出现错误：time stamp... is in the future.
解决方法: 只需加参数m即可。例如： tar -xvjf 变成 tar -xmvjf即可