如何查看当前内核配置？

作者的主页 http://www.it.uc3m.es/~ptb/proconfig/ gentoo加了这个patch，然后
在kernel的配置，file system,

│ CONFIG_PROC_CONFIG: │
│ │
│ This provides a listing in /proc/config of the configuration of │
│ the compiled kernel. It's useful because people forget or lose │
│ their notes on how they compiled which kernel image. You can │
│ then recreate the .config file by │
│ cat /proc/config > /usr/src/linux/.config │
│ │
│ You can compile the code as a module. If compiled in it │
│ will enlarge your kernel by between 3-16KB. │
│ │
│ If unsure, say M.

我是按照module配的
modprobe config
然后就可以 cat /proc/config 了