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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>
This commit is contained in:
Lai Jiangshan 2008-10-18 20:28:18 -07:00 committed by Linus Torvalds
parent 40b6a76237
commit 85dd030edb
1 changed files with 8 additions and 7 deletions
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15
fs/seq_file.c
View File

@ -452,17 +452,18 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, char *esc)
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)
{