'default n' is the default value for any bool or tristate Kconfig setting so there is no need to write it explicitly.
Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO is not set' for visible symbols") the Kconfig behavior is the same regardless of 'default n' being present or not: ... One side effect of (and the main motivation for) this change is making the following two definitions behave exactly the same: config FOO bool config FOO bool default n With this change, neither of these will generate a '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied). That might make it clearer to people that a bare 'default n' is redundant. ... Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnier...@samsung.com> --- drivers/tty/Kconfig | 3 --- drivers/tty/hvc/Kconfig | 2 -- drivers/tty/serial/Kconfig | 3 --- 3 files changed, 8 deletions(-) Index: b/drivers/tty/Kconfig =================================================================== --- a/drivers/tty/Kconfig 2019-04-12 12:13:09.102141672 +0200 +++ b/drivers/tty/Kconfig 2019-04-12 12:13:08.766141664 +0200 @@ -84,7 +84,6 @@ config HW_CONSOLE config VT_HW_CONSOLE_BINDING bool "Support for binding and unbinding console drivers" depends on HW_CONSOLE - default n ---help--- The virtual terminal is the device that interacts with the physical terminal through console drivers. On these systems, at least one @@ -313,7 +312,6 @@ config N_GSM config TRACE_ROUTER tristate "Trace data router for MIPI P1149.7 cJTAG standard" depends on TRACE_SINK - default n help The trace router uses the Linux tty line discipline framework to route trace data coming from a tty port (say UART for example) to @@ -329,7 +327,6 @@ config TRACE_ROUTER config TRACE_SINK tristate "Trace data sink for MIPI P1149.7 cJTAG standard" - default n help The trace sink uses the Linux line discipline framework to receive trace data coming from the trace router line discipline driver Index: b/drivers/tty/hvc/Kconfig =================================================================== --- a/drivers/tty/hvc/Kconfig 2019-04-12 12:13:09.102141672 +0200 +++ b/drivers/tty/hvc/Kconfig 2019-04-12 12:13:09.034141670 +0200 @@ -25,7 +25,6 @@ config HVC_CONSOLE config HVC_OLD_HVSI bool "Old driver for pSeries serial port (/dev/hvsi*)" depends on HVC_CONSOLE - default n config HVC_OPAL bool "OPAL Console support" @@ -74,7 +73,6 @@ config HVC_UDBG bool "udbg based fake hypervisor console" depends on PPC select HVC_DRIVER - default n help This is meant to be used during HW bring up or debugging when no other console mechanism exist but udbg, to get you a quick Index: b/drivers/tty/serial/Kconfig =================================================================== --- a/drivers/tty/serial/Kconfig 2019-04-12 12:13:09.102141672 +0200 +++ b/drivers/tty/serial/Kconfig 2019-04-12 12:13:09.070141671 +0200 @@ -370,7 +370,6 @@ config SERIAL_MAX310X depends on SPI_MASTER select SERIAL_CORE select REGMAP_SPI if SPI_MASTER - default n help This selects support for an advanced UART from Maxim (Dallas). Supported ICs are MAX3107, MAX3108, MAX3109, MAX14830. @@ -653,7 +652,6 @@ config SERIAL_MUX_CONSOLE config PDC_CONSOLE bool "PDC software console support" depends on PARISC && !SERIAL_MUX && VT - default n help Saying Y here will enable the software based PDC console to be used as the system console. This is useful for machines in @@ -1110,7 +1108,6 @@ config SERIAL_QE depends on QUICC_ENGINE select SERIAL_CORE select FW_LOADER - default n help This driver supports the QE serial ports on Freescale embedded PowerPC that contain a QUICC Engine.