linux-kernel - Re: [PATCH V2] LoongArch: Align ACPI structures if ARCH_STRICT

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Message-ID: <CAAhV-H70c=kZf4rjEfiXnpmNb0PjWb_kh7L4ZKhVzpa=teMvFg@mail.gmail.com>
Date: Thu, 11 Sep 2025 16:41:20 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: Huacai Chen <chenhuacai@...ngson.cn>, oe-kbuild-all@...ts.linux.dev, 
	loongarch@...ts.linux.dev, Xuefeng Li <lixuefeng@...ngson.cn>, 
	Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>, 
	Jiaxun Yang <jiaxun.yang@...goat.com>, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org, Binbin Zhou <zhoubinbin@...ngson.cn>, 
	Xi Ruoyao <xry111@...111.site>
Subject: Re: [PATCH V2] LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled

On Thu, Sep 11, 2025 at 9:00 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Huacai,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v6.17-rc5 next-20250910]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Huacai-Chen/LoongArch-Align-ACPI-structures-if-ARCH_STRICT_ALIGN-enabled/20250910-171140
> base:   linus/master
> patch link:    https://lore.kernel.org/r/20250910091033.725716-1-chenhuacai%40loongson.cn
> patch subject: [PATCH V2] LoongArch: Align ACPI structures if ARCH_STRICT_ALIGN enabled
> config: loongarch-randconfig-001-20250911 (https://download.01.org/0day-ci/archive/20250911/202509110853.ASZKE1gv-lkp@intel.com/config)
> compiler: loongarch64-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250911/202509110853.ASZKE1gv-lkp@intel.com/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@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202509110853.ASZKE1gv-lkp@intel.com/
This seems like a compiler issue...
https://github.com/AOSC-Tracking/linux/commit/1e9ee413357ef58dd902f6ec55013d2a2f2043eb

Huacai

>
> All warnings (new ones prefixed by >>):
>
>    In file included from include/acpi/acpi.h:24,
>                     from drivers/acpi/acpica/tbprint.c:10:
>    drivers/acpi/acpica/tbprint.c: In function 'acpi_tb_print_table_header':
> >> include/acpi/actypes.h:530:43: warning: 'strncmp' argument 1 declared attribute 'nonstring' is smaller than the specified bound 8 [-Wstringop-overread]
>      530 | #define ACPI_VALIDATE_RSDP_SIG(a)       (!strncmp (ACPI_CAST_PTR (char, (a)), ACPI_SIG_RSDP, (sizeof(a) < 8) ? ACPI_NAMESEG_SIZE : 8))
>          |                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    drivers/acpi/acpica/tbprint.c:105:20: note: in expansion of macro 'ACPI_VALIDATE_RSDP_SIG'
>      105 |         } else if (ACPI_VALIDATE_RSDP_SIG(ACPI_CAST_PTR(struct acpi_table_rsdp,
>          |                    ^~~~~~~~~~~~~~~~~~~~~~
>    In file included from include/acpi/acpi.h:26:
>    include/acpi/actbl.h:69:14: note: argument 'signature' declared here
>       69 |         char signature[ACPI_NAMESEG_SIZE] ACPI_NONSTRING;       /* ASCII table signature */
>          |              ^~~~~~~~~
>
>
> vim +530 include/acpi/actypes.h
>
> cacba8657351f7 Lv Zheng    2013-09-23  529
> 64b9dfd0776e9c Ahmed Salem 2025-04-25 @530  #define ACPI_VALIDATE_RSDP_SIG(a)       (!strncmp (ACPI_CAST_PTR (char, (a)), ACPI_SIG_RSDP, (sizeof(a) < 8) ? ACPI_NAMESEG_SIZE : 8))
> 4fa4616e279df8 Bob Moore   2015-07-01  531  #define ACPI_MAKE_RSDP_SIG(dest)        (memcpy (ACPI_CAST_PTR (char, (dest)), ACPI_SIG_RSDP, 8))
> cacba8657351f7 Lv Zheng    2013-09-23  532
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki