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treewide: change conditional prompt for choices to 'depends on'

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While Documentation/kbuild/kconfig-language.rst provides a brief
explanation, there are recurring confusions regarding the usage of a
prompt followed by 'if <expr>'. This conditional controls _only_ the
prompt.

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'. This is reasonable
because you are likely want to enable the block device support. When
EXPERT=y, the prompt is shown, allowing you to toggle BLOCK.

Please note that it is different from 'depends on EXPERT', which would
enable and disable the entire config entry.

However, this conditional prompt has never worked in a choice block.

The following two work in the same way: when EXPERT is disabled, the
choice block is entirely disabled.

[Test Code 1]

    choice
            prompt "choose" if EXPERT

    config A
            bool "A"

    config B
            bool "B"

    endchoice

[Test Code 2]

    choice
            prompt "choose"
            depends on EXPERT

    config A
            bool "A"

    config B
            bool "B"

    endchoice

I believe the first case should hide only the prompt, producing the
default:

   CONFIG_A=y
   # CONFIG_B is not set

The next commit will change (fix) the behavior of the conditional prompt
in choice blocks.

I see several choice blocks wrongly using a conditional prompt, where
'depends on' makes more sense.

To preserve the current behavior, this commit converts such misuses.

I did not touch the following entry in arch/x86/Kconfig:

    choice
            prompt "Memory split" if EXPERT
            default VMSPLIT_3G

This is truly the correct use of the conditional prompt; when EXPERT=n,
this choice block should silently select the reasonable VMSPLIT_3G,
although the resulting PAGE_OFFSET will not be affected anyway.

Presumably, the one in fs/jffs2/Kconfig is also correct, but I converted
it to 'depends on' to avoid any potential behavioral change.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2024-06-27 03:22:00 +09:00
parent 7c9bb07a6e
commit b9d73218d7
6 changed files with 16 additions and 8 deletions
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6
arch/arm/Kconfig
View File

@ -1482,7 +1482,8 @@ config ARM_ATAG_DTB_COMPAT
from the ATAG list and store it at run time into the appended DTB.
choice
prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
prompt "Kernel command line type"
depends on ARM_ATAG_DTB_COMPAT
default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
@ -1511,7 +1512,8 @@ config CMDLINE
memory size and the root device (e.g., mem=64M root=/dev/nfs).
choice
prompt "Kernel command line type" if CMDLINE != ""
prompt "Kernel command line type"
depends on CMDLINE != ""
default CMDLINE_FROM_BOOTLOADER
config CMDLINE_FROM_BOOTLOADER

3
arch/arm64/Kconfig
View File

@ -2302,7 +2302,8 @@ config CMDLINE
root device (e.g. root=/dev/nfs).
choice
prompt "Kernel command line type" if CMDLINE != ""
prompt "Kernel command line type"
depends on CMDLINE != ""
default CMDLINE_FROM_BOOTLOADER
help
Choose how the kernel will handle the provided default kernel

6
arch/mips/Kconfig
View File

@ -2924,7 +2924,8 @@ config BUILTIN_DTB
bool
choice
prompt "Kernel appended dtb support" if USE_OF
prompt "Kernel appended dtb support"
depends on USE_OF
default MIPS_NO_APPENDED_DTB
config MIPS_NO_APPENDED_DTB
@ -2965,7 +2966,8 @@ choice
endchoice
choice
prompt "Kernel command line type" if !CMDLINE_OVERRIDE
prompt "Kernel command line type"
depends on !CMDLINE_OVERRIDE
default MIPS_CMDLINE_FROM_DTB if USE_OF && !ATH79 && !MACH_INGENIC && \
!MACH_LOONGSON64 && !MIPS_MALTA && \
!CAVIUM_OCTEON_SOC

3
arch/powerpc/Kconfig
View File

@ -965,7 +965,8 @@ config CMDLINE
most cases you will need to specify the root device here.
choice
prompt "Kernel command line type" if CMDLINE != ""
prompt "Kernel command line type"
depends on CMDLINE != ""
default CMDLINE_FROM_BOOTLOADER
config CMDLINE_FROM_BOOTLOADER

3
arch/riscv/Kconfig
View File

@ -914,7 +914,8 @@ config CMDLINE
line here and choose how the kernel should use it later on.
choice
prompt "Built-in command line usage" if CMDLINE != ""
prompt "Built-in command line usage"
depends on CMDLINE != ""
default CMDLINE_FALLBACK
help
Choose how the kernel will handle the provided built-in command

3
fs/jffs2/Kconfig
View File

@ -151,8 +151,9 @@ config JFFS2_RUBIN
RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure.
choice
prompt "JFFS2 default compression mode" if JFFS2_COMPRESSION_OPTIONS
prompt "JFFS2 default compression mode"
default JFFS2_CMODE_PRIORITY
depends on JFFS2_COMPRESSION_OPTIONS
depends on JFFS2_FS
help
You can set here the default compression mode of JFFS2 from