tree:   git://git.infradead.org/users/hch/misc.git dax-support-cleanups
head:   4b01cc047f5c0a9139340eaae24ec0b80f869396
commit: 306e4c90987837ad7874bc0bc89a55548df3b0a9 [2/9] dax: rename __bdev_dax_supported to bdev_dax_supported
config: m68k-amiga_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 10.3.0
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 remote add hch-misc git://git.infradead.org/users/hch/misc.git
        git fetch --no-tags hch-misc dax-support-cleanups
        git checkout 306e4c90987837ad7874bc0bc89a55548df3b0a9
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/dax/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/dax/super.c:168:6: error: redefinition of 'bdev_dax_supported'
     168 | bool bdev_dax_supported(struct block_device *bdev, int blocksize)
         |      ^~~~~~~~~~~~~~~~~~
   In file included from drivers/dax/super.c:16:
   include/linux/dax.h:179:20: note: previous definition of 'bdev_dax_supported' was here
     179 | static inline bool bdev_dax_supported(struct block_device *bdev,
         |                    ^~~~~~~~~~~~~~~~~~
   drivers/dax/super.c:449:6: warning: no previous prototype for 'run_dax' [-Wmissing-prototypes]
     449 | void run_dax(struct dax_device *dax_dev)
         |      ^~~~~~~


vim +/bdev_dax_supported +168 drivers/dax/super.c

   157	
   158	/**
   159	 * bdev_dax_supported() - Check if the device supports dax for filesystem
   160	 * @bdev: block device to check
   161	 * @blocksize: The block size of the device
   162	 *
   163	 * This is a library function for filesystems to check if the block device
   164	 * can be mounted with dax option.
   165	 *
   166	 * Return: true if supported, false if unsupported
   167	 */
 > 168	bool bdev_dax_supported(struct block_device *bdev, int blocksize)
   169	{
   170		struct dax_device *dax_dev;
   171		struct request_queue *q;
   172		bool ret;
   173		int id;
   174	
   175		q = bdev_get_queue(bdev);
   176		if (!q || !blk_queue_dax(q)) {
   177			pr_info("%pg: error: request queue doesn't support dax\n", bdev);
   178			return false;
   179		}
   180	
   181		dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
   182		if (!dax_dev) {
   183			pr_info("%pg: error: device does not support dax\n", bdev);
   184			return false;
   185		}
   186	
   187		id = dax_read_lock();
   188		ret = dax_supported(dax_dev, bdev, blocksize, 0,
   189				i_size_read(bdev->bd_inode) / 512);
   190		dax_read_unlock(id);
   191	
   192		put_dax(dax_dev);
   193	
   194		return ret;
   195	}
   196	EXPORT_SYMBOL_GPL(bdev_dax_supported);
   197	#endif
   198	

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org