[PATCH 4.19 07/16] bdi: move bdi_dev_name out of line

Greg Kroah-Hartman
2021-08-06T08:19:26Z

From: Christoph Hellwig <hch@lst.de>

[ Upstream commit eb7ae5e06bb6e6ac6bb86872d27c43ebab92f6b2 ]

bdi_dev_name is not a fast path function, move it out of line. This
prepares for using it from modular callers without having to export
an implementation detail like bdi_unknown_name.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/linux/backing-dev.h | 9 +--------
mm/backing-dev.c | 10 +++++++++-
2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 1ef4aca7b953..d28d57eefe9f 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -499,13 +499,6 @@ static inline int bdi_rw_congested(struct backing_dev_info *bdi)
(1 << WB_async_congested));
}

-extern const char *bdi_unknown_name;
-
-static inline const char *bdi_dev_name(struct backing_dev_info *bdi)
-{
- if (!bdi || !bdi->dev)
- return bdi_unknown_name;
- return dev_name(bdi->dev);
-}
+const char *bdi_dev_name(struct backing_dev_info *bdi);

#endif /* _LINUX_BACKING_DEV_H */
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 2152e85891d1..8501b033bca8 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -19,7 +19,7 @@ struct backing_dev_info noop_backing_dev_info = {
EXPORT_SYMBOL_GPL(noop_backing_dev_info);

static struct class *bdi_class;
-const char *bdi_unknown_name = "(unknown)";
+static const char *bdi_unknown_name = "(unknown)";

/*
* bdi_lock protects updates to bdi_list. bdi_list has RCU reader side
@@ -976,6 +976,14 @@ void bdi_put(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL(bdi_put);

+const char *bdi_dev_name(struct backing_dev_info *bdi)
+{
+ if (!bdi || !bdi->dev)
+ return bdi_unknown_name;
+ return dev_name(bdi->dev);
+}
+EXPORT_SYMBOL_GPL(bdi_dev_name);
+
static wait_queue_head_t congestion_wqh[2] = {
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])
--
2.30.2