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kernel: Kconfig: Remove redundant 'default n' properties

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Bool symbols implicitly default to 'n'.

A 'default n' can make sense e.g. in a Kconfig.defconfig file, if you
want to override a 'default y' on the base definition of the symbol. It
isn't used like that on any of these symbols though.

Also simplify the definitions of COOP_ENABLED, PREEMPT_ENABLED, and
SYS_CLOCK_EXISTS. 'default' (and def_bool) can take any expression, not
just a fixed value.

(It would work without the parentheses around the comparisons too.)

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
This commit is contained in:
Ulf Magnusson 2018-06-22 02:25:43 +02:00 • committed by Anas Nashif
commit 7727d1a48e
3 changed files with 3 additions and 39 deletions
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29
kernel/Kconfig
View file

@ -86,14 +86,10 @@ config MAIN_THREAD_PRIORITY
of the main() function. main() can then change its priority if desired.
config COOP_ENABLED
bool
default y
default n if (NUM_COOP_PRIORITIES = 0)
def_bool (NUM_COOP_PRIORITIES != 0)
config PREEMPT_ENABLED
bool
default y
default n if (NUM_PREEMPT_PRIORITIES = 0)
def_bool (NUM_PREEMPT_PRIORITIES != 0)
config PRIORITY_CEILING
int
@ -125,7 +121,6 @@ config NUM_METAIRQ_PRIORITIES
config SCHED_DEADLINE
bool
prompt "Enable earliest-deadline-first scheduling"
default n
help
This enables a simple "earliest deadline first" scheduling
mode where threads can set "deadline" deltas measured in
@ -170,7 +165,6 @@ config ISR_STACK_SIZE
config THREAD_STACK_INFO
bool
prompt "Thread stack info"
default n
help
This option allows each thread to store the thread stack info into
the k_thread data structure.
@ -178,7 +172,6 @@ config THREAD_STACK_INFO
config THREAD_CUSTOM_DATA
bool
prompt "Thread custom data"
default n
help
This option allows each thread to store 32 bits of custom data,
which can be accessed using the k_thread_custom_data_xxx() APIs.
@ -196,7 +189,6 @@ config ERRNO
config APPLICATION_MEMORY
bool
prompt "Split kernel and application memory"
default n
help
For all read-write memory sections (namely bss, noinit, data),
separate them into application and kernel areas. The application area
@ -206,7 +198,6 @@ config APPLICATION_MEMORY
config WAITQ_FAST
bool
prompt "Use scalable wait_q implementation"
default n
help
When selected, the wait_q abstraction used in IPC primitives
to pend threads for wakeup later will be implemented with a
@ -236,7 +227,6 @@ menu "Kernel Debugging and Metrics"
config INIT_STACKS
bool
prompt "Initialize stack areas"
default n
help
This option instructs the kernel to initialize stack areas with a
known value (0xaa) before they are first used, so that the high
@ -246,7 +236,6 @@ config INIT_STACKS
config KERNEL_DEBUG
bool
prompt "Kernel debugging"
default n
select INIT_STACKS
help
Enable kernel debugging.
@ -281,7 +270,6 @@ config BOOT_DELAY
config BUILD_TIMESTAMP
bool
default n
prompt "Build Timestamp"
help
Record a timestamp from the build and add it to the boot banner.
@ -291,7 +279,6 @@ config BUILD_TIMESTAMP
config INT_LATENCY_BENCHMARK
bool
prompt "Interrupt latency metrics [EXPERIMENTAL]"
default n
depends on ARCH="x86"
help
This option enables the tracking of interrupt latency metrics;
@ -303,7 +290,6 @@ config INT_LATENCY_BENCHMARK
config EXECUTION_BENCHMARKING
bool
prompt "Timing metrics"
default n
help
This option enables the tracking of various times inside the kernel
the exact set of metrics being tracked is board-dependent.
@ -313,7 +299,6 @@ config EXECUTION_BENCHMARKING
config THREAD_MONITOR
bool
prompt "Thread monitoring [EXPERIMENTAL]"
default n
help
This option instructs the kernel to maintain a list of all threads
(excluding those that have not yet started or have already
@ -403,7 +388,6 @@ config TIMESLICE_PRIORITY
config POLL
bool
prompt "Async I/O Framework"
default n
help
Asynchronous notification framework. Enable the k_poll() and
k_poll_signal() APIs. The former can wait on multiple events
@ -451,7 +435,6 @@ endmenu
config ARCH_HAS_CUSTOM_SWAP_TO_MAIN
bool
# hidden
default n
help
It's possible that an architecture port cannot use _Swap() to swap to
the _main() thread, but instead must do something custom. It must
@ -460,7 +443,6 @@ config ARCH_HAS_CUSTOM_SWAP_TO_MAIN
config ARCH_HAS_CUSTOM_BUSY_WAIT
bool
# hidden
default n
help
It's possible that an architecture port cannot or does not want to use
the provided k_busy_wait(), but instead must do something custom. It must
@ -500,10 +482,8 @@ config SYS_CLOCK_HW_CYCLES_PER_SEC
and the user should generally avoid modifying it via the menu configuration.
config SYS_CLOCK_EXISTS
bool
def_bool (SYS_CLOCK_TICKS_PER_SEC != 0)
# omit prompt to signify a "hidden" option
default y
default n if (SYS_CLOCK_TICKS_PER_SEC = 0)
help
This option specifies that the kernel lacks timer support.
@ -573,7 +553,6 @@ config RETPOLINE
config STACK_CANARIES
bool
prompt "Compiler stack canaries"
default n
help
This option enables compiler stack canaries support kernel functions.
@ -636,7 +615,6 @@ menu "SMP Options"
config USE_SWITCH
bool
prompt "Use new-style _arch_switch instead of __swap"
default n
help
The _arch_switch() API is a lower level context switching
primitive than the original __swap mechanism. It is required
@ -648,7 +626,6 @@ config USE_SWITCH
config SMP
bool
prompt "Enable symmetric multithreading support"
default n
help
When true, kernel will be built with SMP support, allowing
more than one CPU to schedule Zephyr tasks at a time.

7
kernel/Kconfig.event_logger
View file

@ -7,7 +7,6 @@
menuconfig KERNEL_EVENT_LOGGER
bool
prompt "Enable kernel event logger features"
default n
select RING_BUFFER
help
This feature enables the usage of the profiling logger. Provides the
@ -26,7 +25,6 @@ config KERNEL_EVENT_LOGGER_BUFFER_SIZE
config KERNEL_EVENT_LOGGER_DYNAMIC
bool
prompt "Kernel event logger dynamic enabling"
default n
help
If enabled, kernel event logger is not logging any data to the ring buffer
It is up to the application to set the appropriate flags to enable/disable the
@ -35,7 +33,6 @@ config KERNEL_EVENT_LOGGER_DYNAMIC
config KERNEL_EVENT_LOGGER_CUSTOM_TIMESTAMP
bool
prompt "Kernel event logger custom timestamp"
default n
help
This flag enables the possibility to set the timer function to be used to
populate kernel event logger timestamp. This has to be done at runtime by
@ -46,14 +43,12 @@ menu "Kernel event logging points"
config KERNEL_EVENT_LOGGER_CONTEXT_SWITCH
bool
prompt "Context switch event logging point"
default n
help
Enable the context switch event messages.
config KERNEL_EVENT_LOGGER_INTERRUPT
bool
prompt "Interrupt event logging point"
default n
help
Enable interrupt event messages. These messages provide the following
information: The time when interrupts occur.
@ -61,7 +56,6 @@ config KERNEL_EVENT_LOGGER_INTERRUPT
config KERNEL_EVENT_LOGGER_SLEEP
bool
prompt "Sleep event logging point"
default n
depends on SYS_POWER_MANAGEMENT
help
Enable low power condition event messages. These messages provide the
@ -74,7 +68,6 @@ config KERNEL_EVENT_LOGGER_SLEEP
config KERNEL_EVENT_LOGGER_THREAD
bool
prompt "Thread event logging point"
default n
help
Enable thread event messages. These messages provide the following
information:

6
kernel/Kconfig.power_mgmt
View file

@ -8,7 +8,6 @@
menuconfig SYS_POWER_MANAGEMENT
bool
prompt "Power management"
default n
help
This option enables the board to implement extra power management
policies whenever the kernel becomes idle. The kernel informs the
@ -19,7 +18,6 @@ if SYS_POWER_MANAGEMENT
config SYS_POWER_LOW_POWER_STATE
bool
prompt "Low power state"
default n
depends on SYS_POWER_LOW_POWER_STATE_SUPPORTED
help
This option enables the kernel to interface with a power manager
@ -31,7 +29,6 @@ config SYS_POWER_LOW_POWER_STATE
config SYS_POWER_DEEP_SLEEP
bool
prompt "Deep sleep state"
default n
depends on SYS_POWER_DEEP_SLEEP_SUPPORTED
help
This option enables the kernel to interface with a power manager
@ -45,7 +42,6 @@ config SYS_POWER_DEEP_SLEEP
config DEVICE_POWER_MANAGEMENT
bool
prompt "Device power management"
default n
help
This option enables the device power management interface. The
interface consists of hook functions implemented by device drivers
@ -79,7 +75,6 @@ config TICKLESS_IDLE_THRESH
config TICKLESS_KERNEL
bool
prompt "Tickless kernel"
default n
depends on TICKLESS_IDLE
help
This option enables a fully event driven kernel. Periodic system
@ -102,7 +97,6 @@ config TICKLESS_KERNEL_TIME_UNIT_IN_MICRO_SECS
config BUSY_WAIT_USES_ALTERNATE_CLOCK
bool
prompt "Busy wait uses alternate clock in tickless kernel mode"
default n
help
In tickless kernel mode, the system clock will be stopped when
there are no timer events programmed. If the system clock is to