linux-kernel - Re: include/linux/kvm_host.h:1908:24: warning: field 'desc' with variable sized type 'struct kvm_stats_desc' not at the end of a struct or class is a GNU extension

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Message-ID: <CABCJKufNv+suE+B2as71y8=sF1kxNSL_zcq3GV7o5GxTRpszHw@mail.gmail.com>
Date: Mon, 9 Jun 2025 09:35:19 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: include/linux/kvm_host.h:1908:24: warning: field 'desc' with
 variable sized type 'struct kvm_stats_desc' not at the end of a struct or
 class is a GNU extension

On Mon, Jun 9, 2025 at 1:50 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Sami,
>
> FYI, the error/warning still remains.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   19272b37aa4f83ca52bdf9c16d5d81bdd1354494
> commit: 9c3681f9b9fd12cdbc4a542df599f1837512f3d5 kbuild: Add gendwarfksyms as an alternative to genksyms
> date:   5 months ago
> config: s390-randconfig-r132-20250609 (https://download.01.org/0day-ci/archive/20250609/202506091622.dOo1Na3X-lkp@intel.com/config)
> compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
> reproduce: (https://download.01.org/0day-ci/archive/20250609/202506091622.dOo1Na3X-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/202506091622.dOo1Na3X-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    In file included from <stdin>:3:
>    In file included from arch/s390/include/asm/asm-prototypes.h:4:
> >> include/linux/kvm_host.h:1908:24: warning: field 'desc' with variable sized type 'struct kvm_stats_desc' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
>     1908 |         struct kvm_stats_desc desc;
>          |                               ^
>    1 warning generated.
>    error: gendwarfksyms: process_module: dwarf_get_units failed: no debugging information?

The issue was fixed by this commit:
https://git.kernel.org/torvalds/c/173767c218cc1da74704e7863f165ac8a9796f3e

Sami