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These macros are defined conditionally, according to CONFIG_PM: - if CONFIG_PM is enabled, these macros resolve to DEFINE_SIMPLE_DEV_PM_OPS(), and the dev_pm_ops symbol will be exported. - if CONFIG_PM is disabled, these macros will result in a dummy static dev_pm_ops to be created with the __maybe_unused flag. The dev_pm_ops will then be discarded by the compiler, along with the provided callback functions if they are not used anywhere else. In the second case, the symbol is not exported, which should be perfectly fine - users of the symbol should all use the pm_ptr() or pm_sleep_ptr() macro, so the dev_pm_ops marked as "extern" in the client's code will never be accessed. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| README | ||
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.