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The problem is reported for allmodconfig build setup: ERROR: "irq_chip_retrigger_hierarchy" [drivers/gpio/gpio-lpc18xx.ko] undefined! make[2]: *** [scripts/Makefile.modpost:92: __modpost] Error 1 make[1]: *** [Makefile:1271: modules] Error 2 My testing in runtime shows that it is sufficient to remove .irq_retrigger callback, which is assigned to unexported irq_chip_retrigger_hierarchy() function, I did't observe any regressions, and thus apparently it is a better fix rather than exporting the function defined in kernel/irq/chip.c (see commit52b2a05fa7("genirq: Export IRQ functions for module use")) or sticking the GPIO controller driver build to built-in option only. Reported-by: kbuild test robot <lkp@intel.com> Fixes:5ddabfe8d3("gpio: lpc18xx: add GPIO pin interrupt controller support") Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.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.