80a4da0564
The area at the 0x0FFFD9 physical location in the PC memory space is regular memory, traditionally ROM BIOS and more recently a copy of BIOS code and data in RAM, write-protected. Therefore use memremap() to get access to it rather than ioremap(), avoiding issues in virtualization scenarios and complementing changes such as commitf7750a7956("x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings") or commit5997efb967("x86/boot: Use memremap() to map the MPF and MPC data"). Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/alpine.DEB.2.21.2408242025210.30766@angie.orcam.me.uk Closes: https://lore.kernel.org/r/20240822095122.736522-1-kirill.shutemov@linux.intel.com
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 reStructuredText 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.