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In randconfig testing, certain UBSAN and CC Kconfig combinations with GCC 10.3.0: CONFIG_X86_32=y CONFIG_CC_OPTIMIZE_FOR_SIZE=y CONFIG_UBSAN=y # CONFIG_UBSAN_TRAP is not set # CONFIG_UBSAN_BOUNDS is not set CONFIG_UBSAN_SHIFT=y # CONFIG_UBSAN_DIV_ZERO is not set CONFIG_UBSAN_UNREACHABLE=y CONFIG_UBSAN_BOOL=y # CONFIG_UBSAN_ENUM is not set # CONFIG_UBSAN_ALIGNMENT is not set # CONFIG_UBSAN_SANITIZE_ALL is not set ... produce this build warning (and build error if CONFIG_SECTION_MISMATCH_WARN_ONLY=y is set): WARNING: modpost: vmlinux.o(.text+0x4c1cc): Section mismatch in reference from the function __jump_label_transform() to the function .init.text:text_poke_early() The function __jump_label_transform() references the function __init text_poke_early(). This is often because __jump_label_transform lacks a __init annotation or the annotation of text_poke_early is wrong. ERROR: modpost: Section mismatches detected. The problem is that __jump_label_transform() gets uninlined by GCC, despite there being only a single local scope user of the 'static inline' function. Mark the function __always_inline instead, to work around this compiler bug/artifact. Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.