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f72588a426
The ice_rlan_ctx and ice_tlan_ctx structures have some fields which are intentionally sized larger than necessary relative to the packed sizes the data must fit into. This was done because the original ice_set_ctx() function and its helpers did not correctly handle packing when the packed bits straddled a byte. This is no longer the case with the use of the <linux/packing.h> implementation. Save some bytes in these structures by sizing the variables to the number of bytes the actual bitpacked fields fit into. There are a couple of gaps left in the structure, which is a result of the fields being in the order they appear in the packed bit layout, but where alignment forces some extra gaps. We could fix this, saving ~8 bytes from each structure. However, these structures are not used heavily, and the resulting savings is minimal: $ bloat-o-meter ice-before-reorder.ko ice-after-reorder.ko add/remove: 0/0 grow/shrink: 1/1 up/down: 26/-70 (-44) Function old new delta ice_vsi_cfg_txq 1873 1899 +26 ice_setup_rx_ctx.constprop 1529 1459 -70 Total: Before=1459555, After=1459511, chg -0.00% Thus, the fields are left in the same order as the packed bit layout, despite the gaps this causes. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://patch.msgid.link/20241210-packing-pack-fields-and-ice-implementation-v10-8-ee56a47479ac@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.