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This will catch mistakes like in the following real-world example, where a "CONFIG_" prefix snuck in, making an undefined symbol the default: choice prompt "Compiler optimization level" default CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE config CC_OPTIMIZE_FOR_PERFORMANCE ... config CC_OPTIMIZE_FOR_SIZE ... endchoice This now prints the following warning: init/Kconfig:1036:warning: choice default symbol 'CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE' is not contained in the choice Cases where the default symbol belongs to the wrong choice are also detected. (The mistake is harmless here: Since the default symbol is not visible, the choice falls back on using the first visible symbol as the default, which is CC_OPTIMIZE_FOR_PERFORMANCE, as intended.) Discovered while playing around with Kconfiglib (https://github.com/ulfalizer/Kconfiglib). Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.