[PATCH V2 05/10] sbitmap: export sbitmap_weight

[Ming Lei <ming.lei@xxxxxxxxxx>]

SCSI's .device_busy will be converted to sbitmap, and sbitmap_weight
is needed, so export the helper.

Cc: Omar Sandoval <osandov@xxxxxx>
Cc: Sathya Prakash <sathya.prakash@xxxxxxxxxxxx>
Cc: Chaitra P B <chaitra.basappa@xxxxxxxxxxxx>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@xxxxxxxxxxxx>
Cc: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Cc: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>
Cc: Shivasharan S <shivasharan.srikanteshwara@xxxxxxxxxxxx>
Cc: Ewan D. Milne <emilne@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Bart Van Assche <bart.vanassche@xxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
 include/linux/sbitmap.h |  9 +++++++++
 lib/sbitmap.c           | 11 ++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/include/linux/sbitmap.h b/include/linux/sbitmap.h
index 103b41c03311..34343ce3ef6c 100644
--- a/include/linux/sbitmap.h
+++ b/include/linux/sbitmap.h
@@ -346,6 +346,15 @@ static inline int sbitmap_test_bit(struct sbitmap *sb, unsigned int bitnr)
  */
 void sbitmap_show(struct sbitmap *sb, struct seq_file *m);
 
+
+/**
+ * sbitmap_weight() - Return how many real bits set in a &struct sbitmap.
+ * @sb: Bitmap to check.
+ *
+ * Return: How many real bits set
+ */
+unsigned int sbitmap_weight(const struct sbitmap *sb);
+
 /**
  * sbitmap_bitmap_show() - Write a hex dump of a &struct sbitmap to a &struct
  * seq_file.
diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index ca1a446574aa..254475865b3d 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -345,20 +345,21 @@ static unsigned int __sbitmap_weight(const struct sbitmap *sb, bool set)
 	return weight;
 }
 
-static unsigned int sbitmap_weight(const struct sbitmap *sb)
+static unsigned int sbitmap_cleared(const struct sbitmap *sb)
 {
-	return __sbitmap_weight(sb, true);
+	return __sbitmap_weight(sb, false);
 }
 
-static unsigned int sbitmap_cleared(const struct sbitmap *sb)
+unsigned int sbitmap_weight(const struct sbitmap *sb)
 {
-	return __sbitmap_weight(sb, false);
+	return __sbitmap_weight(sb, true) - sbitmap_cleared(sb);
 }
+EXPORT_SYMBOL_GPL(sbitmap_weight);
 
 void sbitmap_show(struct sbitmap *sb, struct seq_file *m)
 {
 	seq_printf(m, "depth=%u\n", sb->depth);
-	seq_printf(m, "busy=%u\n", sbitmap_weight(sb) - sbitmap_cleared(sb));
+	seq_printf(m, "busy=%u\n", sbitmap_weight(sb));
 	seq_printf(m, "cleared=%u\n", sbitmap_cleared(sb));
 	seq_printf(m, "bits_per_word=%u\n", 1U << sb->shift);
 	seq_printf(m, "map_nr=%u\n", sb->map_nr);
-- 
2.20.1