linux-kernel - drivers/acpi/prmt.c:156:29: error: passing 1-byte aligned argument to 4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an unaligned pointer access [-Werror,-Walign-mismatch]

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Message-ID: <CA+G9fYuVefYJx9JsVx1Wz5pV1jKCp9eCPtwZD+FVhdk841q1Zw@mail.gmail.com>
Date: Wed, 23 Oct 2024 19:39:13 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: clang-built-linux <llvm@...ts.linux.dev>, open list <linux-kernel@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>
Cc: Anders Roxell <anders.roxell@...aro.org>, kobak@...dia.com, 
	"rafael.j.wysocki" <rafael.j.wysocki@...el.com>, Ard Biesheuvel <ardb@...nel.org>, rui.zhang@...el.com, 
	mochs@...dia.com, Dan Carpenter <dan.carpenter@...aro.org>, 
	Nathan Chancellor <nathan@...nel.org>
Subject: drivers/acpi/prmt.c:156:29: error: passing 1-byte aligned argument to
 4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an unaligned
 pointer access [-Werror,-Walign-mismatch]

The following build regressions are noticed on x86 due to following
Warnings and errors with clang-19 and clang-nightly,
The builds with gcc-13 do PASS.

Started happening on next-20241023.
Good:  next-20241022
Bad:    next-20241023

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Build log:
—-------
drivers/acpi/prmt.c:156:29: error: passing 1-byte aligned argument to
4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an
unaligned pointer access [-Werror,-Walign-mismatch]
  156 |                         (void *)efi_pa_va_lookup(&th->guid,
handler_info->handler_address);
      |                                                  ^
drivers/acpi/prmt.c:159:21: error: passing 1-byte aligned argument to
4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an
unaligned pointer access [-Werror,-Walign-mismatch]
  159 |                         efi_pa_va_lookup(&th->guid,
handler_info->static_data_buffer_address);
      |                                          ^
drivers/acpi/prmt.c:162:21: error: passing 1-byte aligned argument to
4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an
unaligned pointer access [-Werror,-Walign-mismatch]
  162 |                         efi_pa_va_lookup(&th->guid,
handler_info->acpi_param_buffer_address);
      |                                          ^
3 errors generated.

Suspecting commit:
  ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context
    Commit id: 088984c8d54c0053fc4ae606981291d741c5924b

Build Links:
—---
build error link:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2npIm4ZOkWenPJ71UOZG57R0jXE/

Metadata:
—----
Git_describe: next-20241023
Git_repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
Git_sha: ceab669fdf7b7510b4e4997b33d6f66e433a96db
Build_name: clang-nightly-lkftconfig
Compiler: clang-nightly
Config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2npIm4ZOkWenPJ71UOZG57R0jXE/config
Download_url:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2npIm4ZOkWenPJ71UOZG57R0jXE/

--
Linaro LKFT
https://lkft.linaro.org