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scsi: sbitmap: Export sbitmap_weight

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

The only existing user of sbitmap_weight() uses it to find out how many
bits are set and not cleared. Align sbitmap_weight() meaning with this
usage model.

Link: https://lore.kernel.org/r/20210122023317.687987-6-ming.lei@redhat.com
Cc: Omar Sandoval <osandov@fb.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Tested-by: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lei 2021-01-22 10:33:09 +08:00 committed by Martin K. Petersen
parent c548e62bcf
commit cbb9950b41
2 changed files with 17 additions and 6 deletions
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10
include/linux/sbitmap.h
View File

@ -341,6 +341,16 @@ 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 set and not cleared bits in a &struct
* sbitmap.
* @sb: Bitmap to check.
*
* Return: How many set and not cleared 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.

13
lib/sbitmap.c
View File

@ -334,20 +334,21 @@ static unsigned int __sbitmap_weight(const struct sbitmap *sb, bool set)
return weight;
}
static unsigned int sbitmap_weight(const struct sbitmap *sb)
{
return __sbitmap_weight(sb, true);
}
static unsigned int sbitmap_cleared(const struct sbitmap *sb)
{
return __sbitmap_weight(sb, false);
}
unsigned int sbitmap_weight(const struct sbitmap *sb)
{
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);