linux-kernel - [PATCH 0/2] kbuild, uapi: Mark inner unions in packed structs as packed

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Message-Id: <20260115-kbuild-alignment-vbox-v1-0-076aed1623ff@linutronix.de>
Date: Thu, 15 Jan 2026 08:35:43 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: "K. Y. Srinivasan" <kys@...rosoft.com>, 
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
 Dexuan Cui <decui@...rosoft.com>, Long Li <longli@...rosoft.com>, 
 Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Hans de Goede <hansg@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
 kernel test robot <lkp@...el.com>
Subject: [PATCH 0/2] kbuild, uapi: Mark inner unions in packed structs as
 packed

The unpacked unions within a packed struct generates alignment warnings
on clang for 32-bit ARM.

With the recent changes to compile-test the UAPI headers in more cases,
these warning in combination with CONFIG_WERROR breaks the build.

Fix the warnings.

Intended for the kbuild tree.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Thomas Weißschuh (2):
      hyper-v: Mark inner union in hv_kvp_exchg_msg_value as packed
      virt: vbox: uapi: Mark inner unions in packed structs as packed

 include/uapi/linux/hyperv.h            | 2 +-
 include/uapi/linux/vbox_vmmdev_types.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
base-commit: e3970d77ec504e54c3f91a48b2125775c16ba4c0
change-id: 20260115-kbuild-alignment-vbox-d0409134d335

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>