linux-kernel - [PATCH] powerpc/perf: Fix for core/nest imc call trace on cpuhotplug

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Date:   Mon, 11 Sep 2017 23:02:14 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        maddy@...ux.vnet.ibm.com, hemant@...ux.vnet.ibm.com,
        anju@...ux.vnet.ibm.com
Subject: [PATCH] powerpc/perf: Fix for core/nest imc call trace on cpuhotplug

Nest/core pmu units are enabled only when it is used. A reference count is
maintained for the events which uses the nest/core pmu units. Currently in
*_imc_counters_release function a WARN() is used for notification of any
underflow of ref count. Replace WARN() with a pr_info since it is an overkill.

Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Acked-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 arch/powerpc/perf/imc-pmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 9ccac86..4d523d0 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -409,7 +409,7 @@ static void nest_imc_counters_release(struct perf_event *event)
 			return;
 		}
 	} else if (ref->refc < 0) {
-		WARN(1, "nest-imc: Invalid event reference count\n");
+		pr_info("nest-imc: Invalid event reference count\n");
 		ref->refc = 0;
 	}
 	mutex_unlock(&ref->lock);
@@ -656,7 +656,7 @@ static void core_imc_counters_release(struct perf_event *event)
 			return;
 		}
 	} else if (ref->refc < 0) {
-		WARN(1, "core-imc: Invalid event reference count\n");
+		pr_info("core-imc: Invalid event reference count\n");
 		ref->refc = 0;
 	}
 	mutex_unlock(&ref->lock);
-- 
2.7.4