dax: Fix compilation for CONFIG_DAX && !CONFIG_FS_DAX

dax_supported() is defined whenever CONFIG_DAX is enabled. So dummy
implementation should be defined only in !CONFIG_DAX case, not in
!CONFIG_FS_DAX case.

Fixes: e2ec51282545 ("dm: Call proper helper to determine dax support")
Cc: <stable@vger.kernel.org>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/include/linux/dax.h b/include/linux/dax.h
index 4970313..43b39ab 100644 (file)
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -58,6 +58,8 @@ static inline void set_dax_synchronous(struct dax_device *dax_dev)
 {
        __set_dax_synchronous(dax_dev);
 }
+bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
+               int blocksize, sector_t start, sector_t len);
 /*
  * Check if given mapping is supported by the file / underlying device.
  */
@@ -104,6 +106,12 @@ static inline bool dax_synchronous(struct dax_device *dax_dev)
 static inline void set_dax_synchronous(struct dax_device *dax_dev)
 {
 }
+static inline bool dax_supported(struct dax_device *dax_dev,
+               struct block_device *bdev, int blocksize, sector_t start,
+               sector_t len)
+{
+       return false;
+}
 static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
                                struct dax_device *dax_dev)
 {
@@ -130,8 +138,6 @@ static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
        return __generic_fsdax_supported(dax_dev, bdev, blocksize, start,
                        sectors);
 }
-bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
-               int blocksize, sector_t start, sector_t len);
 
 static inline void fs_put_dax(struct dax_device *dax_dev)
 {
@@ -159,13 +165,6 @@ static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
        return false;
 }
 
-static inline bool dax_supported(struct dax_device *dax_dev,
-               struct block_device *bdev, int blocksize, sector_t start,
-               sector_t len)
-{
-       return false;
-}
-
 static inline void fs_put_dax(struct dax_device *dax_dev)
 {
 }