linux-kernel - [PATCH 16/32] time: use %*pb[l] to print bitmaps including cpumasks and nodemasks

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Date:	Sat, 24 Jan 2015 09:03:22 -0500
From:	Tejun Heo <tj@...nel.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 16/32] time: 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: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/tick-sched.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 1363d58..a4c4eda 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -326,13 +326,6 @@ static int tick_nohz_cpu_down_callback(struct notifier_block *nfb,
 	return NOTIFY_OK;
 }
 
-/*
- * Worst case string length in chunks of CPU range seems 2 steps
- * separations: 0,2,4,6,...
- * This is NR_CPUS + sizeof('\0')
- */
-static char __initdata nohz_full_buf[NR_CPUS + 1];
-
 static int tick_nohz_init_all(void)
 {
 	int err = -1;
@@ -393,8 +386,8 @@ void __init tick_nohz_init(void)
 		context_tracking_cpu_set(cpu);
 
 	cpu_notifier(tick_nohz_cpu_down_callback, 0);
-	cpulist_scnprintf(nohz_full_buf, sizeof(nohz_full_buf), tick_nohz_full_mask);
-	pr_info("NO_HZ: Full dynticks CPUs: %s.\n", nohz_full_buf);
+	pr_info("NO_HZ: Full dynticks CPUs: %*pbl.\n",
+		cpumask_pr_args(tick_nohz_full_mask));
 }
 #endif
 
-- 
2.1.0

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