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kconfig: remove tristate choice support
I previously submitted a fix for a bug in the choice feature [1], where
I mentioned, "Another (much cleaner) approach would be to remove the
tristate choice support entirely".
There are more issues in the tristate choice feature. For example, you
can observe a couple of bugs in the following test code.
[Test Code]
config MODULES
def_bool y
modules
choice
prompt "tristate choice"
default A
config A
tristate "A"
config B
tristate "B"
endchoice
Bug 1: the 'default' property is not correctly processed
'make alldefconfig' produces:
CONFIG_MODULES=y
# CONFIG_A is not set
# CONFIG_B is not set
However, the correct output should be:
CONFIG_MODULES=y
CONFIG_A=y
# CONFIG_B is not set
The unit test file, scripts/kconfig/tests/choice/alldef_expected_config,
is wrong as well.
Bug 2: choice members never get 'y' with randconfig
For the test code above, the following combinations are possible:
A B
(1) y n
(2) n y
(3) m m
(4) m n
(5) n m
(6) n n
'make randconfig' never produces (1) or (2).
These bugs are fixable, but a more critical problem is the lack of a
sensible syntax to specify the default for the tristate choice.
The default for the choice must be one of the choice members, which
cannot specify any of the patterns (3) through (6) above.
In addition, I have never seen it being used in a useful way.
The following commits removed unnecessary use of tristate choices:
- df8df5e4bc ("usb: get rid of 'choice' for legacy gadget drivers")
- bfb57ef054 ("rapidio: remove choice for enumeration")
This commit removes the tristate choice support entirely, which allows
me to delete a lot of code, making further refactoring easier.
Note:
This includes the revert of commit fa64e5f6a3 ("kconfig/symbol.c:
handle choice_values that depend on 'm' symbols"). It was suspicious
because it did not address the root cause but introduced inconsistency
in visibility between choice members and other symbols.
[1]: https://lore.kernel.org/linux-kbuild/20240427104231.2728905-1-masahiroy@kernel.org/T/#m0a1bb6992581462ceca861b409bb33cb8fd7dbae
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada
@@ -1,10 +1,5 @@
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# SPDX-License-Identifier: GPL-2.0
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config MODULES
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bool "Enable loadable module support"
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modules
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default y
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choice
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prompt "boolean choice"
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default BOOL_CHOICE1
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@@ -16,15 +11,3 @@ config BOOL_CHOICE1
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bool "choice 1"
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endchoice
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choice
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prompt "tristate choice"
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default TRI_CHOICE1
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config TRI_CHOICE0
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tristate "choice 0"
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config TRI_CHOICE1
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tristate "choice 1"
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endchoice
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@@ -1,11 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0
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"""
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Basic choice tests.
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The handling of 'choice' is a bit complicated part in Kconfig.
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The behavior of 'y' choice is intuitive. If choice values are tristate,
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the choice can be 'm' where each value can be enabled independently.
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"""
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@@ -14,11 +9,6 @@ def test_oldask0(conf):
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assert conf.stdout_contains('oldask0_expected_stdout')
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def test_oldask1(conf):
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assert conf.oldaskconfig('oldask1_config') == 0
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assert conf.stdout_contains('oldask1_expected_stdout')
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def test_allyes(conf):
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assert conf.allyesconfig() == 0
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assert conf.config_contains('allyes_expected_config')
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@@ -1,5 +1,2 @@
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CONFIG_MODULES=y
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# CONFIG_BOOL_CHOICE0 is not set
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CONFIG_BOOL_CHOICE1=y
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# CONFIG_TRI_CHOICE0 is not set
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# CONFIG_TRI_CHOICE1 is not set
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@@ -1,5 +1,2 @@
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CONFIG_MODULES=y
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# CONFIG_BOOL_CHOICE0 is not set
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CONFIG_BOOL_CHOICE1=y
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CONFIG_TRI_CHOICE0=m
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CONFIG_TRI_CHOICE1=m
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@@ -1,5 +1,2 @@
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# CONFIG_MODULES is not set
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# CONFIG_BOOL_CHOICE0 is not set
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CONFIG_BOOL_CHOICE1=y
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# CONFIG_TRI_CHOICE0 is not set
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CONFIG_TRI_CHOICE1=y
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@@ -1,5 +1,2 @@
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CONFIG_MODULES=y
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# CONFIG_BOOL_CHOICE0 is not set
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CONFIG_BOOL_CHOICE1=y
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# CONFIG_TRI_CHOICE0 is not set
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CONFIG_TRI_CHOICE1=y
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@@ -1,8 +1,4 @@
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Enable loadable module support (MODULES) [Y/n/?] (NEW)
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boolean choice
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1. choice 0 (BOOL_CHOICE0) (NEW)
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> 2. choice 1 (BOOL_CHOICE1) (NEW)
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choice[1-2?]:
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tristate choice [M/y/?] (NEW)
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choice 0 (TRI_CHOICE0) [N/m/?] (NEW)
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choice 1 (TRI_CHOICE1) [N/m/?] (NEW)
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@@ -1 +0,0 @@
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# CONFIG_MODULES is not set
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@@ -1,9 +0,0 @@
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Enable loadable module support (MODULES) [N/y/?]
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boolean choice
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1. choice 0 (BOOL_CHOICE0) (NEW)
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> 2. choice 1 (BOOL_CHOICE1) (NEW)
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choice[1-2?]:
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tristate choice
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1. choice 0 (TRI_CHOICE0) (NEW)
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> 2. choice 1 (TRI_CHOICE1) (NEW)
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choice[1-2?]:
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@@ -1,21 +0,0 @@
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# SPDX-License-Identifier: GPL-2.0
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config MODULES
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def_bool y
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modules
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config DEP
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tristate
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default m
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choice
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prompt "Tristate Choice"
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config CHOICE0
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tristate "Choice 0"
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config CHOICE1
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tristate "Choice 1"
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depends on DEP
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endchoice
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@@ -1,16 +0,0 @@
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# SPDX-License-Identifier: GPL-2.0
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"""
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Hide tristate choice values with mod dependency in y choice.
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If tristate choice values depend on symbols set to 'm', they should be
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hidden when the choice containing them is changed from 'm' to 'y'
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(i.e. exclusive choice).
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Related Linux commit: fa64e5f6a35efd5e77d639125d973077ca506074
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"""
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def test(conf):
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assert conf.oldaskconfig('config', 'y') == 0
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assert conf.config_contains('expected_config')
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assert conf.stdout_contains('expected_stdout')
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@@ -1,2 +0,0 @@
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CONFIG_CHOICE0=m
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CONFIG_CHOICE1=m
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@@ -1,3 +0,0 @@
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CONFIG_MODULES=y
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CONFIG_DEP=m
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CONFIG_CHOICE0=y
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@@ -1,4 +0,0 @@
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Tristate Choice [M/y/?] y
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Tristate Choice
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> 1. Choice 0 (CHOICE0)
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choice[1]: 1
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@@ -1,25 +0,0 @@
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# SPDX-License-Identifier: GPL-2.0
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config MODULES
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def_bool y
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modules
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choice
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prompt "Choice"
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config CHOICE_VAL0
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tristate "Choice 0"
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config CHOIVE_VAL1
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tristate "Choice 1"
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endchoice
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choice
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prompt "Another choice"
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depends on CHOICE_VAL0
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config DUMMY
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bool "dummy"
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endchoice
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@@ -1,15 +0,0 @@
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# SPDX-License-Identifier: GPL-2.0
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"""
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Do not affect user-assigned choice value by another choice.
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Handling of state flags for choices is complecated. In old days,
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the defconfig result of a choice could be affected by another choice
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if those choices interact by 'depends on', 'select', etc.
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Related Linux commit: fbe98bb9ed3dae23e320c6b113e35f129538d14a
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"""
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def test(conf):
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assert conf.defconfig('defconfig') == 0
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assert conf.config_contains('expected_config')
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@@ -1 +0,0 @@
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CONFIG_CHOICE_VAL0=y
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@@ -1,4 +0,0 @@
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CONFIG_MODULES=y
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CONFIG_CHOICE_VAL0=y
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# CONFIG_CHOIVE_VAL1 is not set
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CONFIG_DUMMY=y
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