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dax: fix FS_DAX=n BLOCK=y compilation 

The 0day kbuild robot reports:

>> drivers//dax/super.c:64:20: error: redefinition of 'fs_dax_get_by_bdev'
    struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
                       ^~~~~~~~~~~~~~~~~~
   In file included from drivers//dax/super.c:22:0:
   include/linux/dax.h:76:34: note: previous definition of 'fs_dax_get_by_bdev' was here
    static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
                                     ^~~~~~~~~~~~~~~~~~

Protect the definition of fs_dax_get_by_bdev() in drivers/dax/super.c
with an ifdef.

Fixes: 78f3547350 ("dax: introduce a fs_dax_get_by_bdev() helper")
Cc: Christoph Hellwig <hch@lst.de>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-09-03 10:17:53 -07:00
parent 8f98ae0c9b
commit 26f2f4de0b
1 changed files with 2 additions and 0 deletions
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2
drivers/dax/super.c
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@ -61,6 +61,7 @@ int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
}
EXPORT_SYMBOL(bdev_dax_pgoff);
#if IS_ENABLED(CONFIG_FS_DAX)
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
{
if (!blk_queue_dax(bdev->bd_queue))
@ -68,6 +69,7 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
return fs_dax_get_by_host(bdev->bd_disk->disk_name);
}
EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
#endif
/**
* __bdev_dax_supported() - Check if the device supports dax for filesystem