-default_CONFIG = CONFIG_DISKBFQ=y
-default_CONFIG = CONFIG_DISKBFQ_SCHED_NAME="bfq"
-default_CONFIG = CONFIG_DISKBFQ_QUEUE_PATH="/sys/class/block/%s/queue/"
-default_CONFIG = CONFIG_DISKBFQ_SCHED_PATH="scheduler"
-default_CONFIG = CONFIG_DISKBFQ_BUDGET_PATH="iosched/budget"
+default_CONFIG += CONFIG_DISKBFQ=y
+default_CONFIG += CONFIG_DISKBFQ_SCHED_NAME="bfq"
+default_CONFIG += CONFIG_DISKBFQ_QUEUE_PATH="/sys/class/block/%s/queue/"
+default_CONFIG += CONFIG_DISKBFQ_SCHED_PATH="scheduler"
+default_CONFIG += CONFIG_DISKBFQ_BUDGET_PATH="iosched/budget"
ifeq ($(CONFIG_DISKBFQ),y)
SUBDIRS = lib mngr #tests