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bdi: move bdi_dev_name out of line 

[ Upstream commit eb7ae5e06b ]

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>
5.4-rM2-2.2.x-imx-squashed
Christoph Hellwig 2020-05-04 14:47:54 +02:00 committed by Greg Kroah-Hartman
parent c1af2c13a4
commit 25390a3198
2 changed files with 10 additions and 9 deletions
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9
include/linux/backing-dev.h
View File

@ -505,13 +505,6 @@ 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 */

10
mm/backing-dev.c
View File

@ -21,7 +21,7 @@ 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 bdi_tree and updates to bdi_list. bdi_list has RCU
@ -1043,6 +1043,14 @@ 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])