linux-kernel - Re: [PATCH] init: check printed flag to skip printing message

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Date:	Thu, 08 Mar 2012 16:11:03 -0800
From:	Joe Perches <joe@...ches.com>
To:	Diwakar Tundlam <dtundlam@...dia.com>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Phil Carmody' <ext-phil.2.carmody@...ia.com>,
	'Russell King' <rmk+kernel@....linux.org.uk>,
	'Greg Kroah-Hartman' <gregkh@...e.de>,
	'Sameer Nanda' <snanda@...omium.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	'Linus Torvalds' <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] init: check printed flag to skip printing message

On Thu, 2012-03-08 at 15:44 -0800, Diwakar Tundlam wrote:
> Otherwise the 'Calibration skipped' message gets printed everytime a CPU is
> hotplugged in, cluttering console for systems that frequently hotplug CPUs.

Perhaps this is more uniform and it saves a few bytes too.

$ size init/calibrate.o*
   text	   data	    bss	    dec	    hex	filename
   2933	     73	    521	   3527	    dc7	init/calibrate.o.new
   2957	     73	    513	   3543	    dd7	init/calibrate.o.old

 init/calibrate.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/init/calibrate.c b/init/calibrate.c
index 5f117ca..4f0af03 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -267,31 +267,32 @@ void __cpuinit calibrate_delay(void)
 
 	if (per_cpu(cpu_loops_per_jiffy, this_cpu)) {
 		lpj = per_cpu(cpu_loops_per_jiffy, this_cpu);
-		pr_info("Calibrating delay loop (skipped) "
-				"already calibrated this CPU");
+		if (!printed)
+			pr_info("Calibrating delay loop%s",
+				" (skipped) already calibrated this CPU");
 	} else if (preset_lpj) {
 		lpj = preset_lpj;
 		if (!printed)
-			pr_info("Calibrating delay loop (skipped) "
-				"preset value.. ");
+			pr_info("Calibrating delay loop%s",
+				" (skipped) preset value..");
 	} else if ((!printed) && lpj_fine) {
 		lpj = lpj_fine;
-		pr_info("Calibrating delay loop (skipped), "
-			"value calculated using timer frequency.. ");
+		pr_info("Calibrating delay loop%s",
+			" (skipped), value calculated using timer frequency..");
 	} else if ((lpj = calibrate_delay_is_known())) {
 		;
 	} else if ((lpj = calibrate_delay_direct()) != 0) {
 		if (!printed)
-			pr_info("Calibrating delay using timer "
-				"specific routine.. ");
+			pr_info("Calibrating delay loop%s",
+				" using timer specific routine..");
 	} else {
 		if (!printed)
-			pr_info("Calibrating delay loop... ");
+			pr_info("Calibrating delay loop%s", "...");
 		lpj = calibrate_delay_converge();
 	}
 	per_cpu(cpu_loops_per_jiffy, this_cpu) = lpj;
 	if (!printed)
-		pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
+		pr_cont(" %lu.%02lu BogoMIPS (lpj=%lu)\n",
 			lpj/(500000/HZ),
 			(lpj/(5000/HZ)) % 100, lpj);
 


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