version magic
在调试linux驱动的过程中偶然遇到这么一种情况：
cfg80211: version magic '3.0.8+ mod_unload ARMv7 ' should be '3.0.8 mod_unload ARMv7 '
insmod: can't insert 'cfg80211.ko': invalid module format
这令我感到很奇怪，本来就是3.0.8的版本，怎么编译出来的驱动的version magic会多了一个+，google一番后，找到如下一段话：
The plus sign is there in the first place because the kernel was
compiled with a git repository, which displayed modifications relativeto the official tree. To avoid it, I could have compiled
the kernel after renaming the .git directory to something else prior
to compiling the kernel. But I forgot to do that.
大概意思就是说我的内核目录下存在.git这个目录，导致编译后的version magic或多一个+，我是用git进行代码跟踪的，当然会有这个目录，解决办法如下：
mv .git anothername
即可。
