local.conf option to produce powertop kernel and citadel-image

meta-citadel/conf/local.conf.sample

@@ -198,3 +198,9 @@ PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"
 # this doesn't mean anything to you.
 CONF_VERSION = "1"
 INHERIT+="toaster buildhistory"
+
+#
+# Enable to build a custom kernel with options set so that powertop can be used, and
+# will also build citadel-image with powertop package installed
+#
+# DISTROOVERRIDES = "citadel-powertop"

meta-citadel/recipes-core/packagegroups/packagegroup-citadel-desktop.bb

@@ -1,6 +1,10 @@
 
 inherit packagegroup
 
+CITADEL_POWERTOP = ""
+# append only if citadel-powertop override is set
+CITADEL_POWERTOP_append_citadel-powertop= "powertop"
+
 RDEPENDS_${PN} = "\
     atk \
     at-spi2-atk \
@@ -88,4 +92,5 @@ RDEPENDS_${PN} = "\
     sway \
     xcb-util-xrm \
     rofi \
+    ${CITADEL_POWERTOP} \
 "

meta-citadel/recipes-kernel/citadel-kernel/citadel-kernel.inc

@@ -4,6 +4,11 @@ LICENSE = "GPLv2"
 
 inherit kernel 
 
+# if OVERRIDES contains citadel-powertop, then find defconfig in citadel-powertop dirctory
+# This config disables CONFIG_GRKERNSEC_KMEM and enables CONFIG_DEBUG_FS so that
+# powertop will work
+FILESEXTRAPATHS_prepend_citadel-powertop = "${FILE_DIRNAME}/citadel-powertop:"
+LINUX_VERSION_EXTENSION_append_citadel-powertop = "-powertop"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 LINUX_VERSION ?= "${PV}"