Re: [PATCH v2 4/4] btrfs: assert sizes of ioctl structures

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On Tue, Jul 14, 2020 at 01:20:53PM +0200, David Sterba wrote:
> On Tue, Jul 14, 2020 at 05:01:21AM +0800, kernel test robot wrote:
> > Hi Johannes,
> > 
> > I love your patch! Yet something to improve:
> > 
> > [auto build test ERROR on v5.8-rc5]
> > [cannot apply to kdave/for-next btrfs/next next-20200713]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use  as documented in
> > https://git-scm.com/docs/git-format-patch]
> > 
> > url:    https://github.com/0day-ci/linux/commits/Johannes-Thumshirn/Two-furhter-additions-for-fsinfo-ioctl/20200713-203321
> > base:    11ba468877bb23f28956a35e896356252d63c983
> > config: x86_64-randconfig-a016-20200713 (attached as .config)
> > compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8)
> > 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
> >         # install x86_64 cross compiling tool for clang build
> >         # apt-get install binutils-x86-64-linux-gnu
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > 
> > All error/warnings (new ones prefixed by >>):
> > 
> >    In file included from <built-in>:1:
> >    In file included from ./usr/include/linux/btrfs_tree.h:5:
> > >> ./usr/include/linux/btrfs.h:35:15: error: expected parameter declarator
> >    static_assert(sizeof(struct btrfs_ioctl_vol_args) == 4096);
> >                  ^
> 
> Does that mean that clang (11.0) does not support static_assert? We
> aren't doing anything special here, include only the standard kernel
> headers and use macros as intended.

Never mind, Johanness fixed it in v2, the macro is not defined for
non-kernel build.



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