Commit fbe98bb9ed3d ("kconfig: Fix defconfig when one choice menu
selects options that another choice menu depends on") fixed defconfig
when two choices interact (i.e. calculating the visibility of a choice
requires to calculate another choice).
The test code in that commit log was based on the real world example,
and complicated. So, I shrunk it down to the following:
defconfig.choice:
---8<---
CONFIG_CHOICE_VAL0=y
---8<---
---8<---
config MODULES
bool "Enable loadable module support"
option modules
default y
choice
prompt "Choice"
config CHOICE_VAL0
tristate "Choice 0"
config CHOICE_VAL1
tristate "Choice 1"
endchoice
choice
prompt "Another choice"
depends on CHOICE_VAL0
config DUMMY
bool "dummy"
endchoice
---8<---
Prior to commit fbe98bb9ed3d,
$ scripts/kconfig/conf --defconfig=defconfig.choice Kconfig.choice
resulted in:
CONFIG_MODULES=y
CONFIG_CHOICE_VAL0=m
# CONFIG_CHOICE_VAL1 is not set
CONFIG_DUMMY=y
where the expected result would be:
CONFIG_MODULES=y
CONFIG_CHOICE_VAL0=y
# CONFIG_CHOICE_VAL1 is not set
CONFIG_DUMMY=y
Roughly, this weird behavior happened like this:
Symbols are calculated a couple of times. First, all symbols are
calculated in conf_read(). The first 'choice' is evaluated to 'y'
due to the SYMBOL_DEF_USER flag, but sym_calc_choice() clears it
unless all of its choice values are explicitly set by the user.
conf_set_all_new_symbols() clears all SYMBOL_VALID flags. Then, only
choices are calculated. At this point, the SYMBOL_DEF_USER for the
first choice is unset, so, it is evaluated to 'm'. (this is weird)
set_all_choice_values() sets SYMBOL_DEF_USER again to choice symbols.
When calculating the second choice, due to 'depends on CHOICE_VAL0',
it triggers the calculation of CHOICE_VAL0. As a result, SYMBOL_VALID
is set for CHOICE_VAL0.
Symbols except choices get the final chance of re-calculation in
conf_write(). In a normal case, CHOICE_VAL0 would be re-caluculated,
then the first choice would be indirectly re-calculated with the
SYMBOL_DEF_USER which has been set by set_all_choice_values(), which
would be evaluated to 'y'. But, in this case, CHOICE_VAL0 has been
marked SYMBOL_VALID, so it is simply skipped. Then, =m is written out
to the .config file.
Add a unit test for this naive case.
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---
Changes in v2:
- Newly added
scripts/kconfig/tests/inter_choice/Kconfig | 24 ++++++++++++++++++++++
scripts/kconfig/tests/inter_choice/__init__.py | 14 +++++++++++++
scripts/kconfig/tests/inter_choice/defconfig | 1 +
scripts/kconfig/tests/inter_choice/expected_config | 4 ++++
4 files changed, 43 insertions(+)
create mode 100644 scripts/kconfig/tests/inter_choice/Kconfig
create mode 100644 scripts/kconfig/tests/inter_choice/__init__.py
create mode 100644 scripts/kconfig/tests/inter_choice/defconfig
create mode 100644 scripts/kconfig/tests/inter_choice/expected_config
diff --git a/scripts/kconfig/tests/inter_choice/Kconfig b/scripts/kconfig/tests/inter_choice/Kconfig
new file mode 100644
index 0000000..57d55c4
--- /dev/null
+++ b/scripts/kconfig/tests/inter_choice/Kconfig
@@ -0,0 +1,24 @@
+config MODULES
+ bool "Enable loadable module support"
+ option modules
+ default y
+
+choice
+ prompt "Choice"
+
+config CHOICE_VAL0
+ tristate "Choice 0"
+
+config CHOIVE_VAL1
+ tristate "Choice 1"
+
+endchoice
+
+choice
+ prompt "Another choice"
+ depends on CHOICE_VAL0
+
+config DUMMY
+ bool "dummy"
+
+endchoice
diff --git a/scripts/kconfig/tests/inter_choice/__init__.py b/scripts/kconfig/tests/inter_choice/__init__.py
new file mode 100644
index 0000000..5c7fc36
--- /dev/null
+++ b/scripts/kconfig/tests/inter_choice/__init__.py
@@ -0,0 +1,14 @@
+"""
+Do not affect user-assigned choice value by another choice.
+
+Handling of state flags for choices is complecated. In old days,
+the defconfig result of a choice could be affected by another choice
+if those choices interact by 'depends on', 'select', etc.
+
+Related Linux commit: fbe98bb9ed3dae23e320c6b113e35f129538d14a
+"""
+
+
+def test(conf):
+ assert conf.defconfig('defconfig') == 0
+ assert conf.config_contains('expected_config')
diff --git a/scripts/kconfig/tests/inter_choice/defconfig b/scripts/kconfig/tests/inter_choice/defconfig
new file mode 100644
index 0000000..162c414
--- /dev/null
+++ b/scripts/kconfig/tests/inter_choice/defconfig
@@ -0,0 +1 @@
+CONFIG_CHOICE_VAL0=y
diff --git a/scripts/kconfig/tests/inter_choice/expected_config b/scripts/kconfig/tests/inter_choice/expected_config
new file mode 100644
index 0000000..5dceefb
--- /dev/null
+++ b/scripts/kconfig/tests/inter_choice/expected_config
@@ -0,0 +1,4 @@
+CONFIG_MODULES=y
+CONFIG_CHOICE_VAL0=y
+# CONFIG_CHOIVE_VAL1 is not set
+CONFIG_DUMMY=y
--
2.7.4
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