v4.12-rc1 does not compile: xfs_file_iomap_begin/end undefined reference

Hi,

v4.12-rc1 does not compile with the attached config. I get the following:
fs/built-in.o: In function `xfs_file_iomap_end':
xfs_iomap.c:(.text+0xb7f75): undefined reference to put_dax' fs/built-in.o: In function xfs_file_iomap_begin':
xfs_iomap.c:(.text+0xb8802): undefined reference to `dax_get_by_host

with the following diff I do not get the error:

.config renamed from .config.old +2 -2

@@ -3362,7 +3362,7 @@ CONFIG_RAS=y
 #
 # CONFIG_ANDROID is not set
 # CONFIG_LIBNVDIMM is not set
-CONFIG_DAX=m
+CONFIG_DAX=y
 # CONFIG_DEV_DAX is not set
 # CONFIG_NVMEM is not set
 # CONFIG_STM is not set

@@ -3439,7 +3439,7 @@ CONFIG_XFS_POSIX_ACL=y
 # CONFIG_BTRFS_FS is not set
 # CONFIG_NILFS2_FS is not set
 # CONFIG_F2FS_FS is not set
-# CONFIG_FS_DAX is not set
+CONFIG_FS_DAX=y
 CONFIG_FS_POSIX_ACL=y
 CONFIG_EXPORTFS=y
 # CONFIG_EXPORTFS_BLOCK_OPS is not set

So I guess, there is some dependency on that option missing.

Best regards,
Julian Wollrath

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Quoted 9 lines

Hi,

v4.12-rc1 does not compile with the attached config. I get the following:
fs/built-in.o: In function `xfs_file_iomap_end':
xfs_iomap.c:(.text+0xb7f75): undefined reference to put_dax' fs/built-in.o: In function xfs_file_iomap_begin':
xfs_iomap.c:(.text+0xb8802): undefined reference to `dax_get_by_host

Does the patch referenced in
https://marc.info/?l=linux-xfs&m=149493347832378&w=2
fix this too?