padata: use %*pb[l] to print bitmaps including cpumasks and nodemasks

printk and friends can now format bitmaps using '%*pb[l]'. cpumask and nodemask also provide cpumask_pr_args() and nodemask_pr_args() respectively which can be used to generate the two printf arguments necessary to format the specified cpu/nodemask. Signed-off-by: Tejun Heo <[email protected]> Cc: Steffen Klassert <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
mrcsosa · Feb 14, 2015 · 4497da6 · 4497da6
1 parent 9e763e0
commit 4497da6
Showing 1 changed file with 3 additions and 8 deletions.
diff --git a/kernel/padata.c b/kernel/padata.c
@@ -917,15 +917,10 @@ static ssize_t show_cpumask(struct padata_instance *pinst,
 	else
 		cpumask = pinst->cpumask.pcpu;
 
-	len = bitmap_scnprintf(buf, PAGE_SIZE, cpumask_bits(cpumask),
-			       nr_cpu_ids);
-	if (PAGE_SIZE - len < 2)
-		len = -EINVAL;
-	else
-		len += sprintf(buf + len, "\n");
-
+	len = snprintf(buf, PAGE_SIZE, "%*pb\n",
+		       nr_cpu_ids, cpumask_bits(cpumask));
 	mutex_unlock(&pinst->lock);
-	return len;
+	return len < PAGE_SIZE ? len : -EINVAL;
 }
 
 static ssize_t store_cpumask(struct padata_instance *pinst,