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[ Upstream commit 2b938e3db335e3670475e31a722c2bee34748c5a ] Definitions of ioread64 and iowrite64 macros in asm/io.h called by vfio pci implementations are enclosed inside check for CONFIG_GENERIC_IOMAP. They don't get defined if CONFIG_GENERIC_IOMAP is defined. Include linux/io-64-nonatomic-lo-hi.h to define iowrite64 and ioread64 macros when they are not defined. io-64-nonatomic-lo-hi.h maps the macros to generic implementation in lib/iomap.c. The generic implementation does 64 bit rw if readq/writeq is defined for the architecture, otherwise it would do 32 bit back to back rw. Note that there are two versions of the generic implementation that differs in the order the 32 bit words are written if 64 bit support is not present. This is not the little/big endian ordering, which is handled separately. This patch uses the lo followed by hi word ordering which is consistent with current back to back implementation in the vfio/pci code. Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20241210131938.303500-2-ramesh.thomas@intel.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.