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In a future patch, the port I/O functions (`inb()`, `outb()`, and friends will only be declared in the `HAS_IOPORT` configuration option is enabled. The 8255_pci module supports PCI digital I/O devices from various manufacturers that consist of one or more 8255 Programmable Peripheral Interface chips (or equivalent hardware) to provide their digital I/O ports. Some of the devices use port I/O and some only use memory-mapped I/O. Conditionally compile in support for the devices that need port I/O if and only if the `CONFIG_HAS_IOPORT` macro is defined. Change `pci_8255_auto_attach()` to return an error if the device actually requires port I/O (based on the PCI BAR resource flags) but the `HAS_IOPORT` configuration is not enabled. Cc: Arnd Bergmann <arnd@kernel.org> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20230913170712.111719-6-abbotti@mev.co.uk 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.