diff --git a/.mailmap b/.mailmap
index c24773db04a7a..6adff2db70765 100644
--- a/.mailmap
+++ b/.mailmap
@@ -152,6 +152,7 @@ Linus Lüssing <linus.luessing@c0d3.blue> <linus.luessing@web.de>
 Linus Lüssing <linus.luessing@c0d3.blue> <linus.luessing@ascom.ch>
 Li Yang <leoyang.li@nxp.com> <leo@zh-kernel.org>
 Li Yang <leoyang.li@nxp.com> <leoli@freescale.com>
+Lukasz Luba <lukasz.luba@arm.com> <l.luba@partner.samsung.com>
 Maciej W. Rozycki <macro@mips.com> <macro@imgtec.com>
 Marc Zyngier <maz@kernel.org> <marc.zyngier@arm.com>
 Marcin Nowakowski <marcin.nowakowski@mips.com> <marcin.nowakowski@imgtec.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index bd5847e802def..950ac3435dcd0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2272,6 +2272,7 @@ F:	drivers/*/*s3c64xx*
 F:	drivers/*/*s5pv210*
 F:	drivers/memory/samsung/
 F:	drivers/soc/samsung/
+F:	drivers/tty/serial/samsung*
 F:	include/linux/soc/samsung/
 F:	Documentation/arm/samsung/
 F:	Documentation/devicetree/bindings/arm/samsung/
@@ -4999,7 +5000,7 @@ F:	include/linux/dma-mapping.h
 F:	include/linux/dma-noncoherent.h
 
 DMC FREQUENCY DRIVER FOR SAMSUNG EXYNOS5422
-M:	Lukasz Luba <l.luba@partner.samsung.com>
+M:	Lukasz Luba <lukasz.luba@arm.com>
 L:	linux-pm@vger.kernel.org
 L:	linux-samsung-soc@vger.kernel.org
 S:	Maintained
diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
index e7e4bb5ad8d5c..fde84f123fbb5 100644
--- a/arch/arm/configs/exynos_defconfig
+++ b/arch/arm/configs/exynos_defconfig
@@ -350,6 +350,7 @@ CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
 CONFIG_DEBUG_INFO=y
 CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_SOFTLOCKUP_DETECTOR=y
 # CONFIG_DETECT_HUNG_TASK is not set