An address_space will only have dax exceptional entries when FS_DAX is
enabled. The current reliance on S_DAX causes compile failures when
S_DAX is defined for DEV_DAX, but FS_DAX is disabled. Make dax_mapping()
always return false so that mm/truncate.c drops its link time
dependencies on fs/dax.c.
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap")
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
include/linux/dax.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 0185ecdae135..62e8cf7eb566 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -107,6 +107,10 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
int __dax_zero_page_range(struct block_device *bdev,
struct dax_device *dax_dev, sector_t sector,
unsigned int offset, unsigned int length);
+static inline bool dax_mapping(struct address_space *mapping)
+{
+ return mapping->host && IS_DAX(mapping->host);
+}
#else
static inline int __dax_zero_page_range(struct block_device *bdev,
struct dax_device *dax_dev, sector_t sector,
@@ -114,12 +118,11 @@ static inline int __dax_zero_page_range(struct block_device *bdev,
{
return -ENXIO;
}
-#endif
-
static inline bool dax_mapping(struct address_space *mapping)
{
- return mapping->host && IS_DAX(mapping->host);
+ return false;
}
+#endif
struct writeback_control;
int dax_writeback_mapping_range(struct address_space *mapping,
