seq_file: don't call bitmap_scnprintf_len()
"m->count + len < m->size" is true commonly, so bitmap_scnprintf()
is commonly called. this fix saves a call to bitmap_scnprintf_len().
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Paul Menage <menage@google.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/seq_file.c b/fs/seq_file.c
index bd20f7f..11c85fe 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -452,17 +452,18 @@
int seq_bitmap(struct seq_file *m, unsigned long *bits, unsigned int nr_bits)
{
- size_t len = bitmap_scnprintf_len(nr_bits);
-
- if (m->count + len < m->size) {
- bitmap_scnprintf(m->buf + m->count, m->size - m->count,
- bits, nr_bits);
- m->count += len;
- return 0;
+ if (m->count < m->size) {
+ int len = bitmap_scnprintf(m->buf + m->count,
+ m->size - m->count, bits, nr_bits);
+ if (m->count + len < m->size) {
+ m->count += len;
+ return 0;
+ }
}
m->count = m->size;
return -1;
}
+EXPORT_SYMBOL(seq_bitmap);
static void *single_start(struct seq_file *p, loff_t *pos)
{