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Multiple structures in the carl9170 driver have alignment impossible alignment constraints that gcc warns about when building with 'make W=1': drivers/net/wireless/ath/carl9170/fwcmd.h:243:2: warning: alignment 1 of 'union <anonymous>' is less than 4 [-Wpacked-not-aligned] drivers/net/wireless/ath/carl9170/wlan.h:373:1: warning: alignment 1 of 'struct ar9170_rx_frame_single' is less than 2 [-Wpacked-not-aligned] In the carl9170_cmd structure, multiple members that have an explicit alignment requirement of four bytes are added into a union with explicit byte alignment, but this in turn is part of a structure that also has four-byte alignment. In the wlan.h header, multiple structures contain a ieee80211_hdr member that is required to be two-byte aligned to avoid alignmnet faults when processing network headers, but all members are forced to be byte-aligned using the __packed tag at the end of the struct definition. In both cases, leaving out the packing does not change the internal layout of the structure but changes the alignment constraint of the structure itself. Change all affected structures to only apply packing where it does not violate the alignment requirement of the contained structure. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Christian Lamparter <chunkeey@gmail.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20210204162926.3262598-1-arnd@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 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.