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docs: kbuild/kconfig: reformat/cleanup 

This document was using headings in an odd way, causing the sidebar to be
quite messy. I've adding new headings and turned some of the old headings
into description lists.

The indentation was a mix of spaces and tabs; I've turned them all into
4 spaces so it always reads correctly regardless of tab settings.

Also use ``...`` instead of `...`; the difference is that `` is meant
for "inline literals" (and renders in a monospace font) while ` is for
"interpreted text" (and renders with italics).

Also changed the title of the document to be more descriptive.

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Vegard Nossum 2024-01-12 13:58:30 +01:00 committed by Masahiro Yamada
parent 93c432e8c9
commit f6314b76d8
1 changed files with 166 additions and 197 deletions
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363
Documentation/kbuild/kconfig.rst
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@ -1,10 +1,10 @@
=================== =================================
Kconfig make config Configuration targets and editors
=================== =================================
This file contains some assistance for using `make *config`. This file contains some assistance for using ``make *config``.
Use "make help" to list all of the possible configuration targets. Use ``make help`` to list all of the possible configuration targets.
The xconfig ('qconf'), menuconfig ('mconf'), and nconfig ('nconf') The xconfig ('qconf'), menuconfig ('mconf'), and nconfig ('nconf')
programs also have embedded help text. Be sure to check that for programs also have embedded help text. Be sure to check that for
@ -12,8 +12,9 @@ navigation, search, and other general help text.
The gconfig ('gconf') program has limited help text. The gconfig ('gconf') program has limited help text.
General General
------- =======
New kernel releases often introduce new config symbols. Often more New kernel releases often introduce new config symbols. Often more
important, new kernel releases may rename config symbols. When important, new kernel releases may rename config symbols. When
@ -24,118 +25,102 @@ symbols have been introduced.
To see a list of new config symbols, use:: To see a list of new config symbols, use::
cp user/some/old.config .config cp user/some/old.config .config
make listnewconfig make listnewconfig
and the config program will list any new symbols, one per line. and the config program will list any new symbols, one per line.
Alternatively, you can use the brute force method:: Alternatively, you can use the brute force method::
make oldconfig make oldconfig
scripts/diffconfig .config.old .config | less scripts/diffconfig .config.old .config | less
----------------------------------------------------------------------
Environment variables for `*config` Environment variables
=====================
KCONFIG_CONFIG Environment variables for ``*config``:
--------------
This environment variable can be used to specify a default kernel config
file name to override the default name of ".config".
KCONFIG_DEFCONFIG_LIST ``KCONFIG_CONFIG``
---------------------- This environment variable can be used to specify a default kernel config
file name to override the default name of ".config".
This environment variable specifies a list of config files which can be used ``KCONFIG_DEFCONFIG_LIST``
as a base configuration in case the .config does not exist yet. Entries in This environment variable specifies a list of config files which can be
the list are separated with whitespaces to each other, and the first one used as a base configuration in case the .config does not exist yet.
that exists is used. Entries in the list are separated with whitespaces to each other, and
the first one that exists is used.
KCONFIG_OVERWRITECONFIG ``KCONFIG_OVERWRITECONFIG``
----------------------- If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not
If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not break symlinks when .config is a symlink to somewhere else.
break symlinks when .config is a symlink to somewhere else.
KCONFIG_WARN_UNKNOWN_SYMBOLS ``KCONFIG_WARN_UNKNOWN_SYMBOLS``
---------------------------- This environment variable makes Kconfig warn about all unrecognized
This environment variable makes Kconfig warn about all unrecognized symbols in the config input.
symbols in the config input.
KCONFIG_WERROR ``KCONFIG_WERROR``
-------------- If set, Kconfig treats warnings as errors.
If set, Kconfig treats warnings as errors.
`CONFIG_` ``CONFIG_``
--------- If you set ``CONFIG_`` in the environment, Kconfig will prefix all symbols
If you set `CONFIG_` in the environment, Kconfig will prefix all symbols with its value when saving the configuration, instead of using the
with its value when saving the configuration, instead of using the default, default, ``CONFIG_``.
`CONFIG_`.
---------------------------------------------------------------------- Environment variables for ``{allyes/allmod/allno/rand}config``:
Environment variables for '{allyes/allmod/allno/rand}config' ``KCONFIG_ALLCONFIG``
The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also
use the environment variable KCONFIG_ALLCONFIG as a flag or a filename
that contains config symbols that the user requires to be set to a
specific value. If KCONFIG_ALLCONFIG is used without a filename where
KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", ``make *config``
checks for a file named "all{yes/mod/no/def/random}.config"
(corresponding to the ``*config`` command that was used) for symbol values
that are to be forced. If this file is not found, it checks for a
file named "all.config" to contain forced values.
KCONFIG_ALLCONFIG This enables you to create "miniature" config (miniconfig) or custom
----------------- config files containing just the config symbols that you are interested
(partially based on lkml email from/by Rob Landley, re: miniconfig) in. Then the kernel config system generates the full .config file,
including symbols of your miniconfig file.
-------------------------------------------------- This ``KCONFIG_ALLCONFIG`` file is a config file which contains
(usually a subset of all) preset config symbols. These variable
settings are still subject to normal dependency checks.
The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also Examples::
use the environment variable KCONFIG_ALLCONFIG as a flag or a filename
that contains config symbols that the user requires to be set to a
specific value. If KCONFIG_ALLCONFIG is used without a filename where
KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", `make *config`
checks for a file named "all{yes/mod/no/def/random}.config"
(corresponding to the `*config` command that was used) for symbol values
that are to be forced. If this file is not found, it checks for a
file named "all.config" to contain forced values.
This enables you to create "miniature" config (miniconfig) or custom KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig
config files containing just the config symbols that you are interested
in. Then the kernel config system generates the full .config file,
including symbols of your miniconfig file.
This 'KCONFIG_ALLCONFIG' file is a config file which contains or::
(usually a subset of all) preset config symbols. These variable
settings are still subject to normal dependency checks.
Examples:: KCONFIG_ALLCONFIG=mini.config make allnoconfig
KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig or::
or:: make KCONFIG_ALLCONFIG=mini.config allnoconfig
KCONFIG_ALLCONFIG=mini.config make allnoconfig These examples will disable most options (allnoconfig) but enable or
disable the options that are explicitly listed in the specified
mini-config files.
or:: Environment variables for ``randconfig``:
make KCONFIG_ALLCONFIG=mini.config allnoconfig ``KCONFIG_SEED``
You can set this to the integer value used to seed the RNG, if you want
to somehow debug the behaviour of the kconfig parser/frontends.
If not set, the current time will be used.
These examples will disable most options (allnoconfig) but enable or ``KCONFIG_PROBABILITY``
disable the options that are explicitly listed in the specified This variable can be used to skew the probabilities. This variable can
mini-config files. be unset or empty, or set to three different formats:
----------------------------------------------------------------------
Environment variables for 'randconfig'
KCONFIG_SEED
------------
You can set this to the integer value used to seed the RNG, if you want
to somehow debug the behaviour of the kconfig parser/frontends.
If not set, the current time will be used.
KCONFIG_PROBABILITY
-------------------
This variable can be used to skew the probabilities. This variable can
be unset or empty, or set to three different formats:
======================= ================== ===================== ======================= ================== =====================
KCONFIG_PROBABILITY y:n split y:m:n split KCONFIG_PROBABILITY y:n split y:m:n split
======================= ================== ===================== ======================= ================== =====================
unset or empty 50 : 50 33 : 33 : 34 unset or empty 50 : 50 33 : 33 : 34
N N : 100-N N/2 : N/2 : 100-N N N : 100-N N/2 : N/2 : 100-N
[1] N:M N+M : 100-(N+M) N : M : 100-(N+M) [1] N:M N+M : 100-(N+M) N : M : 100-(N+M)
[2] N:M:L N : 100-N M : L : 100-(M+L) [2] N:M:L N : 100-N M : L : 100-(M+L)
======================= ================== ===================== ======================= ================== =====================
@ -149,112 +134,98 @@ that:
Examples:: Examples::
KCONFIG_PROBABILITY=10 KCONFIG_PROBABILITY=10
10% of booleans will be set to 'y', 90% to 'n' 10% of booleans will be set to 'y', 90% to 'n'
5% of tristates will be set to 'y', 5% to 'm', 90% to 'n' 5% of tristates will be set to 'y', 5% to 'm', 90% to 'n'
KCONFIG_PROBABILITY=15:25 KCONFIG_PROBABILITY=15:25
40% of booleans will be set to 'y', 60% to 'n' 40% of booleans will be set to 'y', 60% to 'n'
15% of tristates will be set to 'y', 25% to 'm', 60% to 'n' 15% of tristates will be set to 'y', 25% to 'm', 60% to 'n'
KCONFIG_PROBABILITY=10:15:15 KCONFIG_PROBABILITY=10:15:15
10% of booleans will be set to 'y', 90% to 'n' 10% of booleans will be set to 'y', 90% to 'n'
15% of tristates will be set to 'y', 15% to 'm', 70% to 'n' 15% of tristates will be set to 'y', 15% to 'm', 70% to 'n'
---------------------------------------------------------------------- Environment variables for ``syncconfig``:
Environment variables for 'syncconfig' ``KCONFIG_NOSILENTUPDATE``
If this variable has a non-blank value, it prevents silent kernel
config updates (requires explicit updates).
KCONFIG_NOSILENTUPDATE ``KCONFIG_AUTOCONFIG``
---------------------- This environment variable can be set to specify the path & name of the
If this variable has a non-blank value, it prevents silent kernel "auto.conf" file. Its default value is "include/config/auto.conf".
config updates (requires explicit updates).
KCONFIG_AUTOCONFIG ``KCONFIG_AUTOHEADER``
------------------ This environment variable can be set to specify the path & name of the
This environment variable can be set to specify the path & name of the "autoconf.h" (header) file.
"auto.conf" file. Its default value is "include/config/auto.conf". Its default value is "include/generated/autoconf.h".
KCONFIG_AUTOHEADER
------------------
This environment variable can be set to specify the path & name of the
"autoconf.h" (header) file.
Its default value is "include/generated/autoconf.h".
----------------------------------------------------------------------
menuconfig menuconfig
---------- ==========
SEARCHING for CONFIG symbols
Searching in menuconfig: Searching in menuconfig:
The Search function searches for kernel configuration symbol The Search function searches for kernel configuration symbol
names, so you have to know something close to what you are names, so you have to know something close to what you are
looking for. looking for.
Example:: Example::
/hotplug /hotplug
This lists all config symbols that contain "hotplug", This lists all config symbols that contain "hotplug",
e.g., HOTPLUG_CPU, MEMORY_HOTPLUG. e.g., HOTPLUG_CPU, MEMORY_HOTPLUG.
For search help, enter / followed by TAB-TAB (to highlight For search help, enter / followed by TAB-TAB (to highlight
<Help>) and Enter. This will tell you that you can also use <Help>) and Enter. This will tell you that you can also use
regular expressions (regexes) in the search string, so if you regular expressions (regexes) in the search string, so if you
are not interested in MEMORY_HOTPLUG, you could try:: are not interested in MEMORY_HOTPLUG, you could try::
/^hotplug /^hotplug
When searching, symbols are sorted thus: When searching, symbols are sorted thus:
- first, exact matches, sorted alphabetically (an exact match - first, exact matches, sorted alphabetically (an exact match
is when the search matches the complete symbol name); is when the search matches the complete symbol name);
- then, other matches, sorted alphabetically. - then, other matches, sorted alphabetically.
For example: ^ATH.K matches: For example, ^ATH.K matches:
ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG
[...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...] [...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...]
of which only ATH5K and ATH9K match exactly and so are sorted of which only ATH5K and ATH9K match exactly and so are sorted
first (and in alphabetical order), then come all other symbols, first (and in alphabetical order), then come all other symbols,
sorted in alphabetical order. sorted in alphabetical order.
In this menu, pressing the key in the (#) prefix will jump In this menu, pressing the key in the (#) prefix will jump
directly to that location. You will be returned to the current directly to that location. You will be returned to the current
search results after exiting this new menu. search results after exiting this new menu.
---------------------------------------------------------------------- User interface options for 'menuconfig':
User interface options for 'menuconfig' ``MENUCONFIG_COLOR``
It is possible to select different color themes using the variable
MENUCONFIG_COLOR. To select a theme use::
MENUCONFIG_COLOR make MENUCONFIG_COLOR=<theme> menuconfig
----------------
It is possible to select different color themes using the variable
MENUCONFIG_COLOR. To select a theme use::
make MENUCONFIG_COLOR=<theme> menuconfig Available themes are::
Available themes are:: - mono => selects colors suitable for monochrome displays
- blackbg => selects a color scheme with black background
- classic => theme with blue background. The classic look
- bluetitle => a LCD friendly version of classic. (default)
- mono => selects colors suitable for monochrome displays ``MENUCONFIG_MODE``
- blackbg => selects a color scheme with black background This mode shows all sub-menus in one large tree.
- classic => theme with blue background. The classic look
- bluetitle => a LCD friendly version of classic. (default)
MENUCONFIG_MODE Example::
---------------
This mode shows all sub-menus in one large tree.
Example:: make MENUCONFIG_MODE=single_menu menuconfig
make MENUCONFIG_MODE=single_menu menuconfig
----------------------------------------------------------------------
nconfig nconfig
------- =======
nconfig is an alternate text-based configurator. It lists function nconfig is an alternate text-based configurator. It lists function
keys across the bottom of the terminal (window) that execute commands. keys across the bottom of the terminal (window) that execute commands.
@ -266,61 +237,59 @@ Use F1 for Global help or F3 for the Short help menu.
Searching in nconfig: Searching in nconfig:
You can search either in the menu entry "prompt" strings You can search either in the menu entry "prompt" strings
or in the configuration symbols. or in the configuration symbols.
Use / to begin a search through the menu entries. This does Use / to begin a search through the menu entries. This does
not support regular expressions. Use <Down> or <Up> for not support regular expressions. Use <Down> or <Up> for
Next hit and Previous hit, respectively. Use <Esc> to Next hit and Previous hit, respectively. Use <Esc> to
terminate the search mode. terminate the search mode.
F8 (SymSearch) searches the configuration symbols for the F8 (SymSearch) searches the configuration symbols for the
given string or regular expression (regex). given string or regular expression (regex).
In the SymSearch, pressing the key in the (#) prefix will In the SymSearch, pressing the key in the (#) prefix will
jump directly to that location. You will be returned to the jump directly to that location. You will be returned to the
current search results after exiting this new menu. current search results after exiting this new menu.
NCONFIG_MODE Environment variables:
------------
This mode shows all sub-menus in one large tree.
Example:: ``NCONFIG_MODE``
This mode shows all sub-menus in one large tree.
make NCONFIG_MODE=single_menu nconfig Example::
make NCONFIG_MODE=single_menu nconfig
----------------------------------------------------------------------
xconfig xconfig
------- =======
Searching in xconfig: Searching in xconfig:
The Search function searches for kernel configuration symbol The Search function searches for kernel configuration symbol
names, so you have to know something close to what you are names, so you have to know something close to what you are
looking for. looking for.
Example:: Example::
Ctrl-F hotplug Ctrl-F hotplug
or:: or::
Menu: File, Search, hotplug Menu: File, Search, hotplug
lists all config symbol entries that contain "hotplug" in lists all config symbol entries that contain "hotplug" in
the symbol name. In this Search dialog, you may change the the symbol name. In this Search dialog, you may change the
config setting for any of the entries that are not grayed out. config setting for any of the entries that are not grayed out.
You can also enter a different search string without having You can also enter a different search string without having
to return to the main menu. to return to the main menu.
----------------------------------------------------------------------
gconfig gconfig
------- =======
Searching in gconfig: Searching in gconfig:
There is no search command in gconfig. However, gconfig does There is no search command in gconfig. However, gconfig does
have several different viewing choices, modes, and options. have several different viewing choices, modes, and options.