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3101b1e4ba
To check if a certain function (here e.g. pwmchip_add()) can be called IS_REACHABLE is the better check. The relevant difference to IS_ENABLED is that IS_REACHABLE evaluates to 0 if the current code is builtin but the checked symbol is =m and so must not be used. Today there is no practical impact as CONFIG_PWM is a bool. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@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.