kernel/linux.git/scripts/kconfig/symbol.c, branch v6.19.11

kconfig: Avoid prompting for transitional symbols

2025-10-07T15:21:23+00:00

The "transitional" symbol keyword, while working with the "olddefconfig" target, was prompting during "oldconfig". This occurred because these symbols were not being marked as user-defined when they received values from transitional symbols that had user values. The "olddefconfig" target explicitly doesn't prompt for anything, so this deficiency wasn't noticed. The issue manifested when a symbol's value came from a transitional symbol's user value but the receiving symbol wasn't marked with SYMBOL_DEF_USER. Thus the "oldconfig" logic would then prompt for these symbols unnecessarily. Check after value calculation whether a symbol without a user value gets its value from a single transitional symbol that does have a user value. In such cases, mark the receiving symbol as user-defined to prevent prompting. Update regression tests to verify that symbols with transitional defaults are not prompted in "oldconfig", except when conditional defaults evaluate to 'no' and should legitimately be prompted. Build tested with "make testconfig". Reported-by: Linus Torvalds Closes: https://lore.kernel.org/lkml/CAHk-=wgZjUk4Cy2XgNkTrQoO8XCmNUHrTe5D519Fij1POK+3qw@mail.gmail.com/ Fixes: f9afce4f32e9 ("kconfig: Add transitional symbol attribute for migration support") Cc: Vegard Nossum Link: https://lore.kernel.org/r/20250930154514.it.623-kees@kernel.org Signed-off-by: Kees Cook

kconfig: Add transitional symbol attribute for migration support

2025-09-24T21:23:35+00:00

During kernel option migrations (e.g. CONFIG_CFI_CLANG to CONFIG_CFI), existing .config files need to maintain backward compatibility while preventing deprecated options from appearing in newly generated configurations. This is challenging with existing Kconfig mechanisms because: 1. Simply removing old options breaks existing .config files. 2. Manually listing an option as "deprecated" leaves it needlessly visible and still writes them to new .config files. 3. Using any method to remove visibility (.e.g no 'prompt', 'if n', etc) prevents the option from being processed at all. Add a "transitional" attribute that creates symbols which are: - Processed during configuration (can influence other symbols' defaults) - Hidden from user menus (no prompts appear) - Omitted from newly written .config files (gets migrated) - Restricted to only having help sections (no defaults, selects, etc) making it truly just a "prior value pass-through" option. The transitional syntax requires a type argument and prevents type redefinition: config NEW_OPTION bool "New option" default OLD_OPTION config OLD_OPTION bool transitional help Transitional config for OLD_OPTION migration. This allows seamless migration: olddefconfig processes existing CONFIG_OLD_OPTION=y settings to enable CONFIG_NEW_OPTION=y, while CONFIG_OLD_OPTION is omitted from newly generated .config files. Added positive and negative testing via "testconfig" make target. Co-developed-by: Vegard Nossum Signed-off-by: Vegard Nossum Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor Link: https://lore.kernel.org/r/20250923213422.1105654-2-kees@kernel.org Signed-off-by: Kees Cook

kconfig: set MENU_CHANGED to choice when the selected member is changed

2025-06-27T16:57:59+00:00

In gconf, choice entries display the selected symbol in the 'Value' column, but it is not updated when the selected symbol is changed. Set the MENU_CHANGED flag, so it is updated. Signed-off-by: Masahiro Yamada

kconfig: remove unnecessary cast in sym_get_string()

2025-03-15T12:16:21+00:00

The explicit casting from (char *) to (const char *) is unneeded. Signed-off-by: Masahiro Yamada

kconfig: fix memory leak in sym_warn_unmet_dep()

2025-01-29T23:43:12+00:00

The string allocated in sym_warn_unmet_dep() is never freed, leading to a memory leak when an unmet dependency is detected. Fixes: f8f69dc0b4e0 ("kconfig: make unmet dependency warnings readable") Signed-off-by: Masahiro Yamada Reviewed-by: Petr Vorel

kconfig: add sym_get_prompt_menu() helper function

2024-11-05T23:46:34+00:00

Split out the code that retrieves the menu entry with a prompt, so it can be reused in other functions. Signed-off-by: Masahiro Yamada

kconfig: cache expression values

2024-09-20T00:21:53+00:00

Cache expression values to avoid recalculating them repeatedly. Signed-off-by: Masahiro Yamada

scripts: move hash function from scripts/kconfig/ to scripts/include/

2024-09-20T00:21:52+00:00

This function was originally added by commit 8af27e1dc4e4 ("fixdep: use hash table instead of a single array"). Move it to scripts/include/ so that other host programs can use it. Signed-off-by: Masahiro Yamada

kbuild: split x*alloc() functions in kconfig to scripts/include/xalloc.h

2024-09-01T11:34:48+00:00

These functions will be useful for other host programs. Signed-off-by: Masahiro Yamada

kconfig: remove P_SYMBOL property

2024-09-01T11:34:48+00:00

P_SYMBOL is a pseudo property that was previously used for data linking purposes. It is no longer used except for debug prints. Remove it. Signed-off-by: Masahiro Yamada