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The struct mlx5_ib_mr can be used for three different things, but only one at a time: - In the user MR cache - As a kernel MR - As a user MR Overlay the three things into a single union with the following rules: - If the mr is found on the cache_ent->head list then it is a cache MR and umem == NULL. The entire union is zero after the MR is removed from the cache. - If umem != NULL or type == IB_MR_TYPE_USER then it is a user MR. - If umem == NULL then it is a kernel MR This reduces the size of struct mlx5_ib_mr to 552 bytes from 702. The only place the three flows overlap in the code is during dereg, so add a few extra checks along there. Link: https://lore.kernel.org/r/20210304120745.1090751-3-leon@kernel.org Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.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.