linux-kernel - [tip:perf/core] perf/x86/intel/rapl: Clean up the printk output

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Date:	Mon, 29 Feb 2016 03:11:15 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	eranian@...gle.com, jacob.jun.pan@...ux.intel.com,
	kan.liang@...el.com, torvalds@...ux-foundation.org, hpa@...or.com,
	tglx@...utronix.de, jolsa@...hat.com, vincent.weaver@...ne.edu,
	bp@...en8.de, harish.chegondi@...el.com, andi.kleen@...el.com,
	mingo@...nel.org, acme@...hat.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org
Subject: [tip:perf/core] perf/x86/intel/rapl: Clean up the printk output

Commit-ID:  512089d98457b7913d2e4762a44af52fbcd87470
Gitweb:     http://git.kernel.org/tip/512089d98457b7913d2e4762a44af52fbcd87470
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 22 Feb 2016 22:19:23 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 29 Feb 2016 09:35:23 +0100

perf/x86/intel/rapl: Clean up the printk output

The output is inconsistent. Use a proper pr_fmt prefix and split out the
advertisement into a seperate function.

Remove the WARN_ON() in the failure case. It's pointless as we already know
where it failed.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andi Kleen <andi.kleen@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Harish Chegondi <harish.chegondi@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: linux-kernel@...r.kernel.org
Link: http://lkml.kernel.org/r/20160222221012.504551295@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/rapl.c | 42 +++++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index b1d4a2f..f31e4b4 100644
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -44,6 +44,9 @@
  * the duration of the measurement. Tools may use a function such as
  * ldexp(raw_count, -32);
  */
+
+#define pr_fmt(fmt) "RAPL PMU: " fmt
+
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/perf_event.h>
@@ -144,7 +147,7 @@ static inline u64 rapl_read_counter(struct perf_event *event)
 static inline u64 rapl_scale(u64 v, int cfg)
 {
 	if (cfg > NR_RAPL_DOMAINS) {
-		pr_warn("invalid domain %d, failed to scale data\n", cfg);
+		pr_warn("Invalid domain %d, failed to scale data\n", cfg);
 		return v;
 	}
 	/*
@@ -680,6 +683,21 @@ static int rapl_check_hw_unit(void (*quirk)(void))
 	return 0;
 }
 
+static void __init rapl_advertise(void)
+{
+	int i;
+
+	pr_info("API unit is 2^-32 Joules, %d fixed counters, %llu ms ovfl timer\n",
+		hweight32(rapl_cntr_mask), rapl_timer_ms);
+
+	for (i = 0; i < NR_RAPL_DOMAINS; i++) {
+		if (rapl_cntr_mask & (1 << i)) {
+			pr_info("hw unit of domain %s 2^-%d Joules\n",
+				rapl_domain_names[i], rapl_hw_unit[i]);
+		}
+	}
+}
+
 static void __init cleanup_rapl_pmus(void)
 {
 	int cpu;
@@ -696,7 +714,7 @@ static const struct x86_cpu_id rapl_cpu_match[] = {
 static int __init rapl_pmu_init(void)
 {
 	void (*quirk)(void) = NULL;
-	int cpu, ret, i;
+	int cpu, ret;
 
 	/*
 	 * check for Intel processor family 6
@@ -751,30 +769,16 @@ static int __init rapl_pmu_init(void)
 	}
 
 	ret = perf_pmu_register(&rapl_pmu_class, "power", -1);
-	if (WARN_ON(ret)) {
-		pr_info("RAPL PMU detected, registration failed (%d), RAPL PMU disabled\n", ret);
+	if (ret)
 		goto out;
-	}
 
 	__perf_cpu_notifier(rapl_cpu_notifier);
 	cpu_notifier_register_done();
-
-	pr_info("RAPL PMU detected,"
-		" API unit is 2^-32 Joules,"
-		" %d fixed counters"
-		" %llu ms ovfl timer\n",
-		hweight32(rapl_cntr_mask),
-		rapl_timer_ms);
-	for (i = 0; i < NR_RAPL_DOMAINS; i++) {
-		if (rapl_cntr_mask & (1 << i)) {
-			pr_info("hw unit of domain %s 2^-%d Joules\n",
-				rapl_domain_names[i], rapl_hw_unit[i]);
-		}
-	}
-
+	rapl_advertise();
 	return 0;
 
 out:
+	pr_warn("Initialization failed (%d), disabled\n", ret);
 	cleanup_rapl_pmus();
 	cpu_notifier_register_done();
 	return ret;