Kernel config option

Here's how you can read your running kernel's configuration: $ zcat /proc/config.gz | less # # CONFIG_X86_32=y CONFIG_GENERIC_TIME=y CONFIG_LOCKDEP_SUPPORT=y CONFIG_STACKTRACE_SUPPORT=y CONFIG_SEMAPHORE_SLEEPERS=y CONFIG_X86=y CONFIG_MMU=y ...
 * 1) Automatically generated make config: don't edit

'y' means that the config option is set, commented lines, starting with '#', are not set (for clarity also 'n' is added) and 'm' means that the driver is compiled as a kernel module that can be loaded and unloaded during uptime. Some kernel config options can have different values assigned to them.