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If a const * to a kobject is passed to kobj_to_dev(), we want to return back a const * to a device as the driver core shouldn't be modifying a constant structure. But when dealing with container_of() the pointer const attribute is cast away, so we need to manually handle this by determining the type of the pointer passed in to know the type of the pointer to pass out. Luckily _Generic can do this type of magic, and as the kernel now supports C11 it is availble to us to handle this type of build-time type detection. Cc: "Rafael J. Wysocki" <rafael@kernel.org> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20221016104126.1259809-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.