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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-21 14:41:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-21 14:41:00 -0700
commit1d35aae78ffe739bf46c2bf9dea7b51a4eebfbe0 (patch)
tree04c30ae83e5d76abe1284846921f1447f20aed38 /Documentation
parent88d92fb1c034922572bab93482ac9cc61d4ba43c (diff)
parentf2fd2aad1908554fbc4ad6e8ef23bad3086bebd1 (diff)
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Merge tag 'kbuild-v6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada: - Generate a list of built DTB files (arch/*/boot/dts/dtbs-list) - Use more threads when building Debian packages in parallel - Fix warnings shown during the RPM kernel package uninstallation - Change OBJECT_FILES_NON_STANDARD_*.o etc. to take a relative path to Makefile - Support GCC's -fmin-function-alignment flag - Fix a null pointer dereference bug in modpost - Add the DTB support to the RPM package - Various fixes and cleanups in Kconfig * tag 'kbuild-v6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (67 commits) kconfig: tests: test dependency after shuffling choices kconfig: tests: add a test for randconfig with dependent choices kconfig: tests: support KCONFIG_SEED for the randconfig runner kbuild: rpm-pkg: add dtb files in kernel rpm kconfig: remove unneeded menu_is_visible() call in conf_write_defconfig() kconfig: check prompt for choice while parsing kconfig: lxdialog: remove unused dialog colors kconfig: lxdialog: fix button color for blackbg theme modpost: fix null pointer dereference kbuild: remove GCC's default -Wpacked-bitfield-compat flag kbuild: unexport abs_srctree and abs_objtree kbuild: Move -Wenum-{compare-conditional,enum-conversion} into W=1 kconfig: remove named choice support kconfig: use linked list in get_symbol_str() to iterate over menus kconfig: link menus to a symbol kbuild: fix inconsistent indentation in top Makefile kbuild: Use -fmin-function-alignment when available alpha: merge two entries for CONFIG_ALPHA_GAMMA alpha: merge two entries for CONFIG_ALPHA_EV4 kbuild: change DTC_FLAGS_<basetarget>.o to take the path relative to $(obj) ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kbuild/kconfig-language.rst6
-rw-r--r--Documentation/kbuild/kconfig.rst363
2 files changed, 167 insertions, 202 deletions
diff --git a/Documentation/kbuild/kconfig-language.rst b/Documentation/kbuild/kconfig-language.rst
index 0135905c0aa3..79ac2e8184f6 100644
--- a/Documentation/kbuild/kconfig-language.rst
+++ b/Documentation/kbuild/kconfig-language.rst
@@ -393,7 +393,7 @@ of C0, which doesn't depend on M::
choices::
- "choice" [symbol]
+ "choice"
<choice options>
<choice block>
"endchoice"
@@ -412,10 +412,6 @@ the kernel, but all drivers can be compiled as modules.
A choice accepts another option "optional", which allows to set the
choice to 'n' and no entry needs to be selected.
-If no [symbol] is associated with a choice, then you can not have multiple
-definitions of that choice. If a [symbol] is associated to the choice,
-then you may define the same choice (i.e. with the same entries) in another
-place.
comment::
diff --git a/Documentation/kbuild/kconfig.rst b/Documentation/kbuild/kconfig.rst
index c946eb44bd13..fc4e845bc249 100644
--- a/Documentation/kbuild/kconfig.rst
+++ b/Documentation/kbuild/kconfig.rst
@@ -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')
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.
+
General
--------
+=======
New kernel releases often introduce new config symbols. Often more
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::
- cp user/some/old.config .config
- make listnewconfig
+ cp user/some/old.config .config
+ make listnewconfig
and the config program will list any new symbols, one per line.
Alternatively, you can use the brute force method::
- make oldconfig
- scripts/diffconfig .config.old .config | less
-
-----------------------------------------------------------------------
-
-Environment variables for `*config`
+ make oldconfig
+ scripts/diffconfig .config.old .config | less
-KCONFIG_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
-----------------------
+Environment variables
+=====================
-This environment variable specifies a list of config files which can be used
-as a base configuration in case the .config does not exist yet. Entries in
-the list are separated with whitespaces to each other, and the first one
-that exists is used.
+Environment variables for ``*config``:
-KCONFIG_OVERWRITECONFIG
------------------------
-If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not
-break symlinks when .config is a symlink to somewhere else.
+``KCONFIG_CONFIG``
+ This environment variable can be used to specify a default kernel config
+ file name to override the default name of ".config".
-KCONFIG_WARN_UNKNOWN_SYMBOLS
-----------------------------
-This environment variable makes Kconfig warn about all unrecognized
-symbols in the config input.
+``KCONFIG_DEFCONFIG_LIST``
+ This environment variable specifies a list of config files which can be
+ used as a base configuration in case the .config does not exist yet.
+ Entries in the list are separated with whitespaces to each other, and
+ the first one that exists is used.
-KCONFIG_WERROR
---------------
-If set, Kconfig treats warnings as errors.
+``KCONFIG_OVERWRITECONFIG``
+ If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not
+ break symlinks when .config is a symlink to somewhere else.
-`CONFIG_`
----------
-If you set `CONFIG_` in the environment, Kconfig will prefix all symbols
-with its value when saving the configuration, instead of using the default,
-`CONFIG_`.
+``KCONFIG_WARN_UNKNOWN_SYMBOLS``
+ This environment variable makes Kconfig warn about all unrecognized
+ symbols in the config input.
-----------------------------------------------------------------------
+``KCONFIG_WERROR``
+ If set, Kconfig treats warnings as errors.
-Environment variables for '{allyes/allmod/allno/rand}config'
+``CONFIG_``
+ If you set ``CONFIG_`` in the environment, Kconfig will prefix all symbols
+ with its value when saving the configuration, instead of using the
+ default, ``CONFIG_``.
-KCONFIG_ALLCONFIG
------------------
-(partially based on lkml email from/by Rob Landley, re: miniconfig)
+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.
-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.
+ This enables you to create "miniature" config (miniconfig) or custom
+ 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 enables you to create "miniature" config (miniconfig) or custom
-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
-(usually a subset of all) preset config symbols. These variable
-settings are still subject to normal dependency checks.
-
-Examples::
+ 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.
- KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig
+ Examples::
-or::
+ KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig
- KCONFIG_ALLCONFIG=mini.config make allnoconfig
+ or::
-or::
+ KCONFIG_ALLCONFIG=mini.config make allnoconfig
- make KCONFIG_ALLCONFIG=mini.config allnoconfig
+ or::
-These examples will disable most options (allnoconfig) but enable or
-disable the options that are explicitly listed in the specified
-mini-config files.
+ make KCONFIG_ALLCONFIG=mini.config allnoconfig
-----------------------------------------------------------------------
+ These examples will disable most options (allnoconfig) but enable or
+ disable the options that are explicitly listed in the specified
+ mini-config files.
-Environment variables for 'randconfig'
+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_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``
+ 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
- N N : 100-N N/2 : N/2 : 100-N
+ unset or empty 50 : 50 33 : 33 : 34
+ N N : 100-N N/2 : N/2 : 100-N
[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)
======================= ================== =====================
@@ -149,112 +134,98 @@ that:
Examples::
- KCONFIG_PROBABILITY=10
- 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'
- KCONFIG_PROBABILITY=15:25
- 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'
- KCONFIG_PROBABILITY=10:15:15
- 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'
+ KCONFIG_PROBABILITY=10
+ 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'
+ KCONFIG_PROBABILITY=15:25
+ 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'
+ KCONFIG_PROBABILITY=10:15:15
+ 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'
-----------------------------------------------------------------------
+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
-----------------------
-If this variable has a non-blank value, it prevents silent kernel
-config updates (requires explicit updates).
+``KCONFIG_AUTOCONFIG``
+ This environment variable can be set to specify the path & name of the
+ "auto.conf" file. Its default value is "include/config/auto.conf".
-KCONFIG_AUTOCONFIG
-------------------
-This environment variable can be set to specify the path & name of the
-"auto.conf" file. Its default value is "include/config/auto.conf".
+``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".
-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
-----------
-
-SEARCHING for CONFIG symbols
+==========
Searching in menuconfig:
- The Search function searches for kernel configuration symbol
- names, so you have to know something close to what you are
- looking for.
+ The Search function searches for kernel configuration symbol
+ names, so you have to know something close to what you are
+ looking for.
- Example::
+ Example::
- /hotplug
- This lists all config symbols that contain "hotplug",
- e.g., HOTPLUG_CPU, MEMORY_HOTPLUG.
+ /hotplug
+ This lists all config symbols that contain "hotplug",
+ e.g., HOTPLUG_CPU, MEMORY_HOTPLUG.
- For search help, enter / followed by TAB-TAB (to highlight
- <Help>) and Enter. This will tell you that you can also use
- regular expressions (regexes) in the search string, so if you
- are not interested in MEMORY_HOTPLUG, you could try::
+ For search help, enter / followed by TAB-TAB (to highlight
+ <Help>) and Enter. This will tell you that you can also use
+ regular expressions (regexes) in the search string, so if you
+ 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
- is when the search matches the complete symbol name);
- - then, other matches, sorted alphabetically.
+ - first, exact matches, sorted alphabetically (an exact match
+ is when the search matches the complete symbol name);
+ - then, other matches, sorted alphabetically.
- For example: ^ATH.K matches:
+ For example, ^ATH.K matches:
- ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG
- [...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...]
+ ATH5K ATH9K ATH5K_AHB ATH5K_DEBUG [...] ATH6KL ATH6KL_DEBUG
+ [...] ATH9K_AHB ATH9K_BTCOEX_SUPPORT ATH9K_COMMON [...]
- of which only ATH5K and ATH9K match exactly and so are sorted
- first (and in alphabetical order), then come all other symbols,
- sorted in alphabetical order.
+ of which only ATH5K and ATH9K match exactly and so are sorted
+ first (and in alphabetical order), then come all other symbols,
+ sorted in alphabetical order.
- In this menu, pressing the key in the (#) prefix will jump
- directly to that location. You will be returned to the current
- search results after exiting this new menu.
+ In this menu, pressing the key in the (#) prefix will jump
+ directly to that location. You will be returned to the current
+ 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
-----------------
-It is possible to select different color themes using the variable
-MENUCONFIG_COLOR. To select a theme use::
+ make MENUCONFIG_COLOR=<theme> menuconfig
- 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
- - blackbg => selects a color scheme with black background
- - classic => theme with blue background. The classic look
- - bluetitle => a LCD friendly version of classic. (default)
+``MENUCONFIG_MODE``
+ This mode shows all sub-menus in one large tree.
-MENUCONFIG_MODE
----------------
-This mode shows all sub-menus in one large tree.
+ Example::
-Example::
+ make MENUCONFIG_MODE=single_menu menuconfig
- make MENUCONFIG_MODE=single_menu menuconfig
-
-----------------------------------------------------------------------
nconfig
--------
+=======
nconfig is an alternate text-based configurator. It lists function
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:
- You can search either in the menu entry "prompt" strings
- or in the configuration symbols.
+ You can search either in the menu entry "prompt" strings
+ or in the configuration symbols.
+
+ Use / to begin a search through the menu entries. This does
+ not support regular expressions. Use <Down> or <Up> for
+ Next hit and Previous hit, respectively. Use <Esc> to
+ terminate the search mode.
- Use / to begin a search through the menu entries. This does
- not support regular expressions. Use <Down> or <Up> for
- Next hit and Previous hit, respectively. Use <Esc> to
- terminate the search mode.
+ F8 (SymSearch) searches the configuration symbols for the
+ given string or regular expression (regex).
- F8 (SymSearch) searches the configuration symbols for the
- given string or regular expression (regex).
+ In the SymSearch, pressing the key in the (#) prefix will
+ jump directly to that location. You will be returned to the
+ current search results after exiting this new menu.
- In the SymSearch, pressing the key in the (#) prefix will
- jump directly to that location. You will be returned to the
- current search results after exiting this new menu.
+Environment variables:
-NCONFIG_MODE
-------------
-This mode shows all sub-menus in one large tree.
+``NCONFIG_MODE``
+ This mode shows all sub-menus in one large tree.
-Example::
+ Example::
- make NCONFIG_MODE=single_menu nconfig
+ make NCONFIG_MODE=single_menu nconfig
-----------------------------------------------------------------------
xconfig
--------
+=======
Searching in xconfig:
- The Search function searches for kernel configuration symbol
- names, so you have to know something close to what you are
- looking for.
-
- Example::
+ The Search function searches for kernel configuration symbol
+ names, so you have to know something close to what you are
+ looking for.
- Ctrl-F hotplug
+ Example::
- or::
+ Ctrl-F hotplug
- Menu: File, Search, hotplug
+ or::
- lists all config symbol entries that contain "hotplug" in
- the symbol name. In this Search dialog, you may change the
- config setting for any of the entries that are not grayed out.
- You can also enter a different search string without having
- to return to the main menu.
+ Menu: File, Search, hotplug
+ lists all config symbol entries that contain "hotplug" in
+ the symbol name. In this Search dialog, you may change the
+ config setting for any of the entries that are not grayed out.
+ You can also enter a different search string without having
+ to return to the main menu.
-----------------------------------------------------------------------
gconfig
--------
+=======
Searching in gconfig:
- There is no search command in gconfig. However, gconfig does
- have several different viewing choices, modes, and options.
+ There is no search command in gconfig. However, gconfig does
+ have several different viewing choices, modes, and options.