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[ Upstream commitc20edbacc0] No idea what the current barrier position was meant for. At that point, nothing is read from the descriptor, only the pointer to the actual one is fetched. The correct barrier usage here is after the generation check, so that only the first qword is read if the descriptor is not yet ready and we need to stop polling. Debatable on coherent DMA as the Rx descriptor size is <= cacheline size, but anyway, the current barrier position only makes the codegen worse. Fixes:3a8845af66("idpf: add RX splitq napi poll support") Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com> Tested-by: Ramu R <ramu.r@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.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 reStructuredText 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.