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kconfig: fix conditional prompt behavior for choice

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When a prompt is followed by "if <expr>", the symbol is configurable
when the if-conditional evaluates to true.

A typical usage is as follows:

    menuconfig BLOCK
            bool "Enable the block layer" if EXPERT
            default y

When EXPERT=n, the prompt is hidden, but this config entry is still
active, and BLOCK is set to its default value 'y'. When EXPERT=y, the
prompt is shown, making BLOCK a user-configurable option.

This usage is common throughout the kernel tree, but it has never worked
within a choice block.

[Test Code]

    config EXPERT
            bool "Allow expert users to modify more options"

    choice
            prompt "Choose" if EXPERT

    config A
            bool "A"

    config B
            bool "B"

    endchoice

[Result]

    # CONFIG_EXPERT is not set

When the prompt is hidden, the choice block should produce the default
without asking for the user's preference. Hence, the output should be:

    # CONFIG_EXPERT is not set
    CONFIG_A=y
    # CONFIG_B is not set

Removing unnecessary hacks fixes the issue.

This commit also changes the behavior of 'select' by choice members.

[Test Code 2]

    config MODULES
            def_bool y
            modules

    config DEP
            def_tristate m

    if DEP

    choice
            prompt "choose"

    config A
            bool "A"
            select C

    endchoice

    config B
            def_bool y
            select D

    endif

    config C
            tristate

    config D
            tristate

The current output is as follows:

    CONFIG_MODULES=y
    CONFIG_DEP=m
    CONFIG_A=y
    CONFIG_B=y
    CONFIG_C=y
    CONFIG_D=m

With this commit, the output will be changed as follows:

    CONFIG_MODULES=y
    CONFIG_DEP=m
    CONFIG_A=y
    CONFIG_B=y
    CONFIG_C=m
    CONFIG_D=m

CONFIG_C will be changed to 'm' because 'select C' will inherit the
dependency on DEP, which is 'm'.

This change is aligned with the behavior of 'select' outside a choice
block; 'select D' depends on DEP, therefore D is selected by (B && DEP).

Note:

With this commit, allmodconfig will set CONFIG_USB_ROLE_SWITCH to 'm'
instead of 'y'. I did not see any build regression with this change.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2024-06-27 03:22:01 +09:00
parent b9d73218d7
commit d533828ef3
2 changed files with 4 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
scripts/kconfig/menu.c
View File

@ -306,7 +306,7 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
struct menu *menu, *last_menu;
struct symbol *sym;
struct property *prop;
struct expr *parentdep, *basedep, *dep, *dep2;
struct expr *basedep, *dep, *dep2;
sym = parent->sym;
if (parent->list) {
@ -315,24 +315,6 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
* and propagate parent dependencies before moving on.
*/
bool is_choice = false;
if (sym && sym_is_choice(sym))
is_choice = true;
if (is_choice) {
/*
* Use the choice itself as the parent dependency of
* the contained items. This turns the mode of the
* choice into an upper bound on the visibility of the
* choice value symbols.
*/
parentdep = expr_alloc_symbol(sym);
} else {
/* Menu node for 'menu', 'if' */
parentdep = parent->dep;
}
/* For each child menu node... */
for (menu = parent->list; menu; menu = menu->next) {
/*
@ -341,7 +323,7 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
*/
basedep = rewrite_m(menu->dep);
basedep = expr_transform(basedep);
basedep = expr_alloc_and(expr_copy(parentdep), basedep);
basedep = expr_alloc_and(expr_copy(parent->dep), basedep);
basedep = expr_eliminate_dups(basedep);
menu->dep = basedep;
@ -405,15 +387,12 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
}
}
if (is_choice)
expr_free(parentdep);
/*
* Recursively process children in the same fashion before
* moving on
*/
for (menu = parent->list; menu; menu = menu->next)
_menu_finalize(menu, is_choice);
_menu_finalize(menu, sym && sym_is_choice(sym));
} else if (!inside_choice && sym) {
/*
* Automatic submenu creation. If sym is a symbol and A, B, C,
@ -541,17 +520,6 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
sym_check_prop(sym);
sym->flags |= SYMBOL_WARNED;
}
/*
* For choices, add a reverse dependency (corresponding to a select) of
* '<visibility> && y'. This prevents the user from setting the choice
* mode to 'n' when the choice is visible.
*/
if (sym && sym_is_choice(sym) && parent->prompt) {
sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
expr_alloc_and(parent->prompt->visible.expr,
expr_alloc_symbol(&symbol_yes)));
}
}
void menu_finalize(void)

2
scripts/kconfig/symbol.c
View File

@ -868,7 +868,7 @@ const char *sym_get_string_value(struct symbol *sym)
bool sym_is_changeable(struct symbol *sym)
{
return sym->visible > sym->rev_dep.tri;
return !sym_is_choice(sym) && sym->visible > sym->rev_dep.tri;
}
HASHTABLE_DEFINE(sym_hashtable, SYMBOL_HASHSIZE);