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@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Harish Chegondi <harish.chegondi@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20160222221012.504551295@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 23 insertions, 19 deletions

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index b1d4a2f1feeb..f31e4b417adf 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;