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

htejun · torvalds · commit 807de073bb5c · 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.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Cc: Christoph Lameter &lt;cl@linux-foundation.org&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/mm/percpu.c b/mm/percpu.c
@@ -1528,7 +1528,6 @@ static void pcpu_dump_alloc_info(const char *lvl,
 int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 				  void *base_addr)
 {
-	static char cpus_buf[4096] __initdata;
 	static int smap[PERCPU_DYNAMIC_EARLY_SLOTS] __initdata;
 	static int dmap[PERCPU_DYNAMIC_EARLY_SLOTS] __initdata;
 	size_t dyn_size = ai->dyn_size;
@@ -1541,12 +1540,11 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 	int *unit_map;
 	int group, unit, i;
 
-	cpumask_scnprintf(cpus_buf, sizeof(cpus_buf), cpu_possible_mask);
-
 #define PCPU_SETUP_BUG_ON(cond)	do {					\
 	if (unlikely(cond)) {						\
 		pr_emerg("PERCPU: failed to initialize, %s", #cond);	\
-		pr_emerg("PERCPU: cpu_possible_mask=%s\n", cpus_buf);	\
+		pr_emerg("PERCPU: cpu_possible_mask=%*pb\n",		\
+			 cpumask_pr_args(cpu_possible_mask));		\
 		pcpu_dump_alloc_info(KERN_EMERG, ai);			\
 		BUG();							\
 	}								\
