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The existing function doesn't compare the access bitmaps and flags. This can result in failure to update those attributes in existing ranges when all other attributes remained unchanged. Because the access and flags attributes modify only some bits in the respective bitmaps, we cannot compare them directly. Instead we need to check whether applying the attributes to a particular range would change the bitmaps. A PREFETCH_LOC attribute must always trigger a migration, even if the attribute value remains unchanged. E.g. if some pages were migrated due to a CPU page fault, a prefetch must still be executed to migrate pages back to VRAM. Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Philip Yang <Philip.Yang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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 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.