On Mon, Sep 20, 2021 at 11:01 AM kernel test robot [off-list ref] wrote:

Hi Christoph,

I love your patch! Yet something to improve:

[auto build test ERROR on axboe-block/for-next]
[also build test ERROR on linus/master v5.15-rc2 next-20210920]
[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]

url:    https://github.com/0day-ci/linux/commits/Christoph-Hellwig/nvdimm-pmem-fix-creating-the-dax-group/20210920-162804
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: riscv-buildonly-randconfig-r006-20210920 (attached as .config)
compiler: riscv64-linux-gcc (GCC) 11.2.0
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
        # https://github.com/0day-ci/linux/commit/1a16d0f32f70bcd159a9f8cf32794f4024e8711e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Christoph-Hellwig/nvdimm-pmem-fix-creating-the-dax-group/20210920-162804
        git checkout 1a16d0f32f70bcd159a9f8cf32794f4024e8711e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=riscv

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   drivers/dax/super.c:375:6: error: no previous prototype for 'run_dax' [-Werror=missing-prototypes]
     375 | void run_dax(struct dax_device *dax_dev)
         |      ^~~~~~~

In this new -Werror world drivers/dax/bus.c needs:

#include "bus.h"

quoted

quoted

drivers/dax/super.c:70:27: error: 'dax_get_by_host' defined but not used [-Werror=unused-function]

      70 | static struct dax_device *dax_get_by_host(const char *host)
         |                           ^~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

Nice additional cleanup that now fs_dax_get_by_bdev() is the only
caller of dax_get_by_host().