linux-kernel - [PATCH 5.4 72/72] dax: Fix compilation for CONFIG_DAX && !CONFIG_FS

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Date:   Mon, 21 Sep 2020 18:31:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        kernel test robot <lkp@...el.com>, Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 5.4 72/72] dax: Fix compilation for CONFIG_DAX && !CONFIG_FS_DAX

From: Jan Kara <jack@...e.cz>

commit 88b67edd7247466bc47f01e1dc539b0d0d4b931e upstream.

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@...r.kernel.org>
Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/dax.h |   17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -56,6 +56,8 @@ static inline void set_dax_synchronous(s
 {
 	__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.
  */
@@ -102,6 +104,12 @@ static inline bool dax_synchronous(struc
 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)
 {
@@ -128,8 +136,6 @@ static inline bool generic_fsdax_support
 	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 struct dax_device *fs_dax_get_by_host(const char *host)
 {
@@ -167,13 +173,6 @@ static inline struct dax_device *fs_dax_
 	return NULL;
 }
 
-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)
 {
 }