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

htejun · torvalds · commit 660e5ec02d53 · 2015-02-13T21:21:37.000-08:00
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.

* Line termination only requires one extra space at the end of the
  buffer.  Use PAGE_SIZE - 1 instead of PAGE_SIZE - 2 when formatting.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Cc: Russell King &lt;linux@arm.linux.org.uk&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
@@ -806,8 +806,8 @@ static int cci_pmu_event_init(struct perf_event *event)
 static ssize_t pmu_attr_cpumask_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
-	int n = cpulist_scnprintf(buf, PAGE_SIZE - 2, &pmu->cpus);
-
+	int n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
+			  cpumask_pr_args(&pmu->cpus));
 	buf[n++] = '\n';
 	buf[n] = '\0';
 	return n;
