drivers/hid/hid-nvidia-shield.c:59:2: warning: field within 'struct thunderstrike_hostcmd_resp_report' is less aligned than 'union thunderstrike_hostcmd_resp_report::(anonymous at drivers/hid/hid-nvidia-shield.c:59:2)' and is usually due to 'struct thund...

From: kernel test robot
Date: Tue Jul 04 2023 - 03:13:54 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 24be4d0b46bb0c3c1dc7bacd30957d6144a70dfc
commit: 09308562d4afb1abc66366608fa1cb9de783272f HID: nvidia-shield: Initial driver implementation with Thunderstrike support
date: 4 weeks ago
config: arm-randconfig-r014-20230704 (https://download.01.org/0day-ci/archive/20230704/202307041500.6bKn7nCl-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce: (https://download.01.org/0day-ci/archive/20230704/202307041500.6bKn7nCl-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307041500.6bKn7nCl-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/hid/hid-nvidia-shield.c:59:2: warning: field within 'struct thunderstrike_hostcmd_resp_report' is less aligned than 'union thunderstrike_hostcmd_resp_report::(anonymous at drivers/hid/hid-nvidia-shield.c:59:2)' and is usually due to 'struct thunderstrike_hostcmd_resp_report' being packed, which can lead to unaligned accesses [-Wunaligned-access]
union {
^
1 warning generated.

vim +59 drivers/hid/hid-nvidia-shield.c

53
54 struct thunderstrike_hostcmd_resp_report {
55 u8 report_id; /* THUNDERSTRIKE_HOSTCMD_RESP_REPORT_ID */
56 u8 cmd_id;
57 u8 reserved_at_10;
58
> 59 union {
60 struct thunderstrike_hostcmd_board_info board_info;
61 struct thunderstrike_hostcmd_haptics motors;
62 __le16 fw_version;
63 u8 payload[30];
64 };
65 } __packed;
66 static_assert(sizeof(struct thunderstrike_hostcmd_resp_report) ==
67 THUNDERSTRIKE_HOSTCMD_REPORT_SIZE);
68

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