[PATCH] ceph: undefine pr_fmt before redefining it

[Jeff Layton <jlayton@xxxxxxxxxx>]

The preprocessor throws a warning here in some cases:

In file included from fs/ceph/super.h:5,
                 from fs/ceph/io.c:16:
./include/linux/ceph/ceph_debug.h:5: warning: "pr_fmt" redefined
    5 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      |
In file included from ./include/linux/kernel.h:15,
                 from fs/ceph/io.c:12:
./include/linux/printk.h:288: note: this is the location of the previous definition
  288 | #define pr_fmt(fmt) fmt
      |

Since we do mean to redefine it, make that explicit by undefining it
first.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
 include/linux/ceph/ceph_debug.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/ceph/ceph_debug.h b/include/linux/ceph/ceph_debug.h
index d5a5da838caf..fa4a84e0e018 100644
--- a/include/linux/ceph/ceph_debug.h
+++ b/include/linux/ceph/ceph_debug.h
@@ -2,6 +2,7 @@
 #ifndef _FS_CEPH_DEBUG_H
 #define _FS_CEPH_DEBUG_H
 
+#undef pr_fmt
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/string.h>
-- 
2.21.0