[TRIVIAL PATCH] bdi_register: Add __printf verification, fix arg mismatch

[Joe Perches <joe@perches.com>]

__printf is useful to verify format and arguments.

Signed-off-by: Joe Perches <joe@perches.com>
---
 fs/ceph/super.c             |    2 +-
 include/linux/backing-dev.h |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 2eb43f2..e7dbb5c 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -849,7 +849,7 @@ static int ceph_register_bdi(struct super_block *sb,
 		fsc->backing_dev_info.ra_pages =
 			default_backing_dev_info.ra_pages;
 
-	err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
+	err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
 			   atomic_long_inc_return(&bdi_seq));
 	if (!err)
 		sb->s_bdi = &fsc->backing_dev_info;
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 2a9a9ab..12731a1 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -114,6 +114,7 @@ struct backing_dev_info {
 int bdi_init(struct backing_dev_info *bdi);
 void bdi_destroy(struct backing_dev_info *bdi);
 
+__printf(3, 4)
 int bdi_register(struct backing_dev_info *bdi, struct device *parent,
 		const char *fmt, ...);
 int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);