diff options
| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2026-01-15 08:35:44 +0100 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 07:19:58 -0500 |
| commit | 7b021ff9baf4c6abee9dcb525531559c40d08eb4 (patch) | |
| tree | 4a1417a18169607857d8c4efc05763ae6fb77d4f /include | |
| parent | b6117210ed349356f8e6027ff020b4d620bca42b (diff) | |
hyper-v: Mark inner union in hv_kvp_exchg_msg_value as packed
[ Upstream commit 1e5271393d777f6159d896943b4c44c4f3ecff52 ]
The unpacked union within a packed struct generates alignment warnings
on clang for 32-bit ARM:
./usr/include/linux/hyperv.h:361:2: error: field within 'struct hv_kvp_exchg_msg_value'
is less aligned than 'union hv_kvp_exchg_msg_value::(anonymous at ./usr/include/linux/hyperv.h:361:2)'
and is usually due to 'struct hv_kvp_exchg_msg_value' being packed,
which can lead to unaligned accesses [-Werror,-Wunaligned-access]
361 | union {
| ^
With the recent changes to compile-test the UAPI headers in more cases,
this warning in combination with CONFIG_WERROR breaks the build.
Fix the warning.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512140314.DzDxpIVn-lkp@intel.com/
Reported-by: Nathan Chancellor <nathan@kernel.org>
Closes: https://lore.kernel.org/linux-kbuild/20260110-uapi-test-disable-headers-arm-clang-unaligned-access-v1-1-b7b0fa541daa@kernel.org/
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/linux-kbuild/29b2e736-d462-45b7-a0a9-85f8d8a3de56@app.fastmail.com/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Wei Liu (Microsoft) <wei.liu@kernel.org>
Tested-by: Nicolas Schier <nsc@kernel.org>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patch.msgid.link/20260115-kbuild-alignment-vbox-v1-1-076aed1623ff@linutronix.de
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/hyperv.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h index 6135d92e0d47..a9f05c61b37e 100644 --- a/include/uapi/linux/hyperv.h +++ b/include/uapi/linux/hyperv.h @@ -351,7 +351,7 @@ struct hv_kvp_exchg_msg_value { __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE]; __u32 value_u32; __u64 value_u64; - }; + } __attribute__((packed)); } __attribute__((packed)); struct hv_kvp_msg_enumerate { |