shell: kernel_service: reorg the commands

Split the `kernel_service.c` into multiple subcommand files,
each file would register with the main `kernel` cmd based on
the dependencies in Kconfig/CMakeLists.txt.

This greatly reduces the number of precompiler directives.

Signed-off-by: Yong Cong Sin <[email protected]>
Signed-off-by: Yong Cong Sin <[email protected]>

subsys/shell/modules/CMakeLists.txt

@@ -1,9 +1,9 @@
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_sources_ifdef(
-  CONFIG_KERNEL_SHELL
-  kernel_service.c
-  )
+add_subdirectory_ifdef(CONFIG_KERNEL_SHELL
+  kernel_service
+)
+
 zephyr_sources_ifdef(
   CONFIG_DEVICE_SHELL
   device_service.c

subsys/shell/modules/Kconfig

@@ -3,29 +3,6 @@
 # Copyright (c) 2016 Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
 
-config KERNEL_SHELL
-	bool "Kernel shell"
-	default y if !SHELL_MINIMAL
-	imply INIT_STACKS
-	imply THREAD_MONITOR
-	imply THREAD_NAME
-	imply THREAD_STACK_INFO
-	help
-	  This shell provides access to basic kernel data like version, uptime
-	  and other useful information.
-
-config KERNEL_SHELL_REBOOT_DELAY
-	int "Delay between reception of shell reboot command and reboot (ms)"
-	depends on KERNEL_SHELL
-	depends on REBOOT
-	default 0
-	help
-	  This delay allows time for the shell to successfully echo the reboot
-	  command input before the reboot abruptly terminates it. This can help
-	  external systems that interact with the shell and require the reboot
-	  command's echo to successfully complete to synchronise with the
-	  device.
-
 config DEVICE_SHELL
 	bool "Device shell"
 	default y if !SHELL_MINIMAL
@@ -45,3 +22,5 @@ config DEVMEM_SHELL
 	select POSIX_C_LIB_EXT
 	help
 	  This shell command provides read/write access to physical memory.
+
+rsource "kernel_service/Kconfig"