Re: kernel/gcov/fs.c:103: warning: Excess struct member 'buffer' description in 'gcov_iterator'
From: Kees Cook
Date: Thu Dec 14 2023 - 16:51:17 EST
On Fri, Dec 15, 2023 at 04:53:19AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 5bd7ef53ffe5ca580e93e74eb8c81ed191ddc4bd
> commit: fbd126f5a658b92c7f6af986a6d89cf5e5693268 gcov: annotate struct gcov_iterator with __counted_by
> date: 8 weeks ago
> config: i386-buildonly-randconfig-001-20231214 (https://download.01.org/0day-ci/archive/20231215/202312150432.oBngC94A-lkp@xxxxxxxxx/config)
> compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231215/202312150432.oBngC94A-lkp@xxxxxxxxx/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@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202312150432.oBngC94A-lkp@xxxxxxxxx/
>
> All warnings (new ones prefixed by >>):
>
> >> kernel/gcov/fs.c:103: warning: Excess struct member 'buffer' description in 'gcov_iterator'
>
>
> vim +103 kernel/gcov/fs.c
>
> 7a1d55b987dfcb Johannes Berg 2021-05-06 90
> 7a1d55b987dfcb Johannes Berg 2021-05-06 91 /**
> 7a1d55b987dfcb Johannes Berg 2021-05-06 92 * struct gcov_iterator - specifies current file position in logical records
> 7a1d55b987dfcb Johannes Berg 2021-05-06 93 * @info: associated profiling data
> 7a1d55b987dfcb Johannes Berg 2021-05-06 94 * @buffer: buffer containing file data
> 7a1d55b987dfcb Johannes Berg 2021-05-06 95 * @size: size of buffer
> 7a1d55b987dfcb Johannes Berg 2021-05-06 96 * @pos: current position in file
> 7a1d55b987dfcb Johannes Berg 2021-05-06 97 */
> 7a1d55b987dfcb Johannes Berg 2021-05-06 98 struct gcov_iterator {
> 7a1d55b987dfcb Johannes Berg 2021-05-06 99 struct gcov_info *info;
> 7a1d55b987dfcb Johannes Berg 2021-05-06 100 size_t size;
> 7a1d55b987dfcb Johannes Berg 2021-05-06 101 loff_t pos;
> fbd126f5a658b9 Kees Cook 2023-09-22 102 char buffer[] __counted_by(size);
> 7a1d55b987dfcb Johannes Berg 2021-05-06 @103 };
> 7a1d55b987dfcb Johannes Berg 2021-05-06 104
It looks like whatever produces that error is not parsing attributes
correctly. I suspect this is the "htmldocs" target and "__counted_by" is
missing from Documentation/conf.py. I'll investigate...
--
Kees Cook