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The new unified memory manager uses page offset to pass buffer handle during the mmap operation. One problem with this approach is that it requires the handle to always be divisible by the page size, else, the user would not be able to pass it correctly as an argument to the mmap system call. Previously, this was achieved by shifting the handle left after alloc operation, and shifting it right before get operation. This was done in the user code. This creates code duplication, and, what's worse, requires some knowledge from the user regarding the handle internal structure, hurting the encapsulation. This patch encloses all the page shifts inside memory manager functions. This way, the user can take the handle as a black box, and simply use it, without any concert about how it actually works. Signed-off-by: Yuri Nudelman <ynudelman@habana.ai> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.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.