linux-kernel - [PATCH 17/32] percpu: use %*pb[l] to print bitmaps including cpumasks and nodemasks

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Date:	Sat, 24 Jan 2015 09:03:23 -0500
From:	Tejun Heo <tj@...nel.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: [PATCH 17/32] percpu: use %*pb[l] to print bitmaps including cpumasks and nodemasks

printk and friends can now formap 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.

This patch is dependent on the following two patches.

 lib/vsprintf: implement bitmap printing through '%*pb[l]'
 cpumask, nodemask: implement cpumask/nodemask_pr_args()

Please wait till the forementioned patches are merged to mainline
before applying to subsystem trees.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Lameter <cl@...ux-foundation.org>
---
 mm/percpu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index d39e2f4..73c97a5 100644
--- 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();							\
 	}								\
-- 
2.1.0

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