[patch V2 22/28] x86/perf/intel/rapl: Cleanup the printk output

From: Thomas Gleixner
Date: Mon Feb 22 2016 - 06:10:19 EST


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@xxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel_rapl.c | 42 +++++++++++++++-------------
1 file changed, 23 insertions(+), 19 deletions(-)

Index: b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
===================================================================
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_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(stru
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 (*qui
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_
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;