linux-kernel - Re: fs/btrfs/tests/../ctree.h:2166:8: warning: type qualifiers ignored on function return type

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Message-ID: <20200727153538.GP3703@twin.jikos.cz>
Date:   Mon, 27 Jul 2020 17:35:38 +0200
From:   David Sterba <dsterba@...e.cz>
To:     kernel test robot <lkp@...el.com>
Cc:     David Sterba <dsterba@...e.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: fs/btrfs/tests/../ctree.h:2166:8: warning: type qualifiers
 ignored on function return type

On Mon, Jul 27, 2020 at 11:02:07PM +0800, kernel test robot wrote:
> Hi David,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   92ed301919932f777713b9172e525674157e983d
> commit: f7cea56c0fff95bd5a6cd21b9fa299f66193b604 btrfs: sysfs: export supported checksums
> date:   8 months ago
> config: h8300-randconfig-r021-20200727 (attached as .config)
> compiler: h8300-linux-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout f7cea56c0fff95bd5a6cd21b9fa299f66193b604
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from fs/btrfs/tests/extent-map-tests.c:8:
> >> fs/btrfs/tests/../ctree.h:2166:8: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
>     2166 | size_t __const btrfs_get_num_csums(void);
>          |        ^~~~~~~

Ah right, the attribute is supposed to be __attribute_const__, thanks
for the report.