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Now that the child MRs are stored in an xarray we can rely on the SRCU lock to protect the xa_load and use xa_cmpxchg on the slow allocation path to resolve races with concurrent page fault. This reduces the scope of the critical section of umem_mutex for implicit MRs to only cover mlx5_ib_update_xlt, and avoids taking a lock at all if the child MR is already in the xarray. This makes it consistent with the normal ODP MR critical section for umem_lock, and the locking approach used for destroying an unusued implicit child MR. The MLX5_IB_UPD_XLT_ATOMIC is no longer needed in implicit_get_child_mr() since it is no longer called with any locks. Link: https://lore.kernel.org/r/20191009160934.3143-11-jgg@ziepe.ca Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.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.