block: kill bdev_dax_capable()

This is leftover dead code that has since been replaced by
bdev_dax_supported().
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

fs/block_dev.c

@@ -807,30 +807,6 @@ int bdev_dax_supported(struct super_block *sb, int blocksize)
 }
 EXPORT_SYMBOL_GPL(bdev_dax_supported);
 
-/**
- * bdev_dax_capable() - Return if the raw device is capable for dax
- * @bdev: The device for raw block device access
- */
-bool bdev_dax_capable(struct block_device *bdev)
-{
-	struct blk_dax_ctl dax = {
-		.size = PAGE_SIZE,
-	};
-
-	if (!IS_ENABLED(CONFIG_FS_DAX))
-		return false;
-
-	dax.sector = 0;
-	if (bdev_direct_access(bdev, &dax) < 0)
-		return false;
-
-	dax.sector = bdev->bd_part->nr_sects - (PAGE_SIZE / 512);
-	if (bdev_direct_access(bdev, &dax) < 0)
-		return false;
-
-	return true;
-}
-
 /*
  * pseudo-fs
  */

include/linux/blkdev.h

@@ -1958,7 +1958,6 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *,
 						struct writeback_control *);
 extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
 extern int bdev_dax_supported(struct super_block *, int);
-extern bool bdev_dax_capable(struct block_device *);
 #else /* CONFIG_BLOCK */
 
 struct block_device;