1 files changed, 70 insertions, 0 deletions
diff --git a/0001-dax-Fix-compilation-for-CONFIG_DAX-CONFIG_FS_DAX.patch b/0001-dax-Fix-compilation-for-CONFIG_DAX-CONFIG_FS_DAX.patch
new file mode 100644
index 000000000..c92a2f5c4
--- /dev/null
+++ b/0001-dax-Fix-compilation-for-CONFIG_DAX-CONFIG_FS_DAX.patch
@@ -0,0 +1,70 @@
+From 8b8c7d6148bc1bab3cf88cac49038a05db7dd938 Mon Sep 17 00:00:00 2001
+From: Jan Kara <jack@suse.cz>
+Date: Mon, 21 Sep 2020 11:33:23 +0200
+Subject: [PATCH] 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>
+Signed-off-by: Jan Kara <jack@suse.cz>
+---
+ include/linux/dax.h | 17 ++++++++---------
+ 1 file changed, 8 insertions(+), 9 deletions(-)
+
+diff --git a/include/linux/dax.h b/include/linux/dax.h
+index 497031392e0a..43b39ab9de1a 100644
+--- 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)
+ {
+ }
+-- 
+2.16.4
+