Under linux how to view the current configuration of the kernel?

A: zcat /proc/config.gz

     Of course, there is a prerequisite, we need to open the kernel of the following two options (CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC):

　　General setup --->

　　<*> Kernel .config support

　　[ * ]　　Enable access to .config through /proc/config.gz