genkernel: add page (#1433)

pages/linux/genkernel.md

@@ -0,0 +1,23 @@
+# genkernel
+
+> Gentoo Linux utility to compile and install kernels.
+
+- Automatically compile and install a generic kernel:
+
+`sudo genkernel all`
+
+- Build and install the bzImage|initramfs|kernel|ramdisk only:
+
+`sudo genkernel {{bzImage|initramfs|kernel|ramdisk}}`
+
+- Apply changes to the kernel configuration before compiling and installing:
+
+`sudo genkernel --menuconfig all`
+
+- Generate a kernel with a custom name:
+
+`sudo genkernel --kernname={{custom_name}} all`
+
+- Use a kernel source outside of the default directory /usr/src/linux:
+
+`sudo genkernel --kerneldir={{path/to/directory}} all`