98 lines
4.2 KiB
Plaintext
98 lines
4.2 KiB
Plaintext
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kconfig_lint is a tool to help identify issues within coreboot's Kconfig
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files. It is very specific to coreboot, and is not intended to be used as a
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generic Kconfig lint tool for other projects.
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Operation:
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kconfig_lint parses the entire kconfig tree, building up a hash table of all
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of the statements. It then searches the coreboot tree looking for all usage of
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any Kconfig symbols. By combining these two, it is able to find many issues
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that would be difficult to locate otherwise.
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Usage:
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kconfig_lint <options>
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-o|--output=file Set output filename
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-p|--print Print full output
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-e|--errors_off Don't print warnings or errors
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-w|--warnings_off Don't print warnings
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-n|--notes Show minor notes
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-G|--no_git_grep Use standard grep tools instead of git grep
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Options:
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-o|--output=file Send the output to a file instead of printing to stdout.
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-p|--print Shows the entire Kconfig tree as parsed by kconfig_lint,
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including the filename and line number of each statement.
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This can be very helpful for debugging Kconfig issues.
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-e|--errors_off Suppress both error and warning output. Useful along with
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the --print command
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-w|--warnings_off Suppress warning output
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-n|--notes Enable the display of minor notes that kconfig_lint has
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found. These might be issues, but probably are not.
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-G|--no_git_grep Instead of using the 'git grep' command, use regular grep.
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This is useful for checking coreboot trees that are not
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contained in a git repo.
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Issues that kconfig_lint checks for:
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Notes:
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- Show when the range set for a hex or int does not match a previous range
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Warnings in Kconfig files:
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- Any 'default' expressions that can never be reached.
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- Symbols that are defined but never used.
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- Help text starting with no whitespace.
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- Directories specified in a 'source' keyword do not exist.
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- A 'source' keyword loading a Kconfig file that has already been loaded.
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- A 'source' keyword loading a Kconfig file that doesn't exist. Note that
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globs are excluded from this check.
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Warnings in coreboot source files:
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- #define of Kconfig symbol - Symbols should only be defined in Kconfig.
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- #define starting with 'CONFIG_' - these should be reserved for Kconfig
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symbols.
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- 'IS_ENABLED()' block that could not be interpreted.
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- Kconfig files that are not loaded by a 'source' keyword.
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Errors in Kconfig files:
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- Selects do not work on symbols created in a choice block.
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- All symbols used in selects or expressions must be defined in a config
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statement.
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- 'endchoice' keyword not used in a choice block
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- Choice block defined with no symbols.
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- The 'tristate' type is not used in coreboot.
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- A 'select' keyword used outside of a config block.
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- Symbols created both inside and outside of a choice block.
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- A 'range' keyword has higher minimum than maximum value.
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- A config block with a prompt at the top level (the top level is currently
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just for menus).
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- Indentation using spaces instead of tabs. We indent using tabs, although
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the tab may be followed by spaces, particularly for help blocks.
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- Lines not ending with a linefeed. These can cause some keywords to not
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function properly ('source' keywords in particular). It's also just
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generally good to end the file with a linefeed.
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Errors in Kconfig that are also caught by Kconfig itself:
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- Invalid expressions.
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- Unrecognized keywords.
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- An 'optional' keyword used outside of a choice block
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- The 'select' keyword only works on bool symbols.
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- A 'range' keyword used outside of a config block.
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- A 'default' keyword used outside of a config or choice block.
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- Symbol types must be consistent - they cannot be bool in one location and
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int in another location.
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- Type keywords (bool, int, hex, string) used outside of a config block.
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- Using a 'prompt' keyword not inside a config or choice block.
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Errors in coreboot source files:
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- '#ifdef' or '#if defined' used on bool, int, or hex - these are always
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defined in coreboot's version of Kconfig.
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- The IS_ENABLED macro is only valid for bool symbols.
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- The IS_ENABLED used on unknown CONFIG_ value, like an obsolete symbol.
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TODO: check for choice entries at the top level
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