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Message-ID: <20220815092815.11597-1-yangyicong@huawei.com>
Date: Mon, 15 Aug 2022 17:28:15 +0800
From: Yicong Yang <yangyicong@...wei.com>
To: <will@...nel.org>, <mark.rutland@....com>, <Frank.li@....com>,
<shawnguo@...nel.org>, <s.hauer@...gutronix.de>
CC: <kernel@...gutronix.de>, <festevam@...il.com>, <linux-imx@....com>,
<zhangshaokun@...ilicon.com>, <agross@...nel.org>,
<bjorn.andersson@...aro.org>, <konrad.dybcio@...ainline.org>,
<khuong@...amperecomputing.com>, <john.garry@...wei.com>,
<jonathan.cameron@...wei.com>, <yangyicong@...ilicon.com>,
<gregkh@...uxfoundation.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: [PATCH] drivers/perf: Change WARN_ON() to dev_err() on irq_set_affinity() failure
From: Yicong Yang <yangyicong@...ilicon.com>
The WARN_ON() on irq_set_affinity() failure is misused according to the [1]
and may crash people's box unintentionally. This may also be redundant since
in the failure case we may also trigger the WARN and dump the stack in the
perf core[2] for a second time.
So change the WARN_ON() to dev_err() to just print the failure message.
[1] https://github.com/torvalds/linux/blob/master/include/asm-generic/bug.h#L74
[2] https://github.com/torvalds/linux/blob/master/kernel/events/core.c#L313
Suggested-by: Greg KH <gregkh@...uxfoundation.org>
[https://lore.kernel.org/lkml/YuOi3i0XHV++z1YI@kroah.com/]
Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
---
drivers/perf/arm-ccn.c | 5 +++--
drivers/perf/arm_dmc620_pmu.c | 3 ++-
drivers/perf/arm_smmuv3_pmu.c | 6 ++++--
drivers/perf/fsl_imx8_ddr_perf.c | 3 ++-
drivers/perf/hisilicon/hisi_pcie_pmu.c | 6 ++++--
drivers/perf/hisilicon/hisi_uncore_pmu.c | 6 ++++--
drivers/perf/qcom_l2_pmu.c | 8 ++++++--
drivers/perf/xgene_pmu.c | 6 ++++--
8 files changed, 29 insertions(+), 14 deletions(-)
diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c
index 728d13d8e98a..83abd909ba49 100644
--- a/drivers/perf/arm-ccn.c
+++ b/drivers/perf/arm-ccn.c
@@ -1210,8 +1210,9 @@ static int arm_ccn_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
return 0;
perf_pmu_migrate_context(&dt->pmu, cpu, target);
dt->cpu = target;
- if (ccn->irq)
- WARN_ON(irq_set_affinity(ccn->irq, cpumask_of(dt->cpu)));
+ if (ccn->irq && irq_set_affinity(ccn->irq, cpumask_of(dt->cpu)))
+ dev_err(ccn->dev, "Failed to set interrupt affinity\n");
+
return 0;
}
diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c
index 280a6ae3e27c..b59d3d9eb779 100644
--- a/drivers/perf/arm_dmc620_pmu.c
+++ b/drivers/perf/arm_dmc620_pmu.c
@@ -621,7 +621,8 @@ static int dmc620_pmu_cpu_teardown(unsigned int cpu,
perf_pmu_migrate_context(&dmc620_pmu->pmu, irq->cpu, target);
mutex_unlock(&dmc620_pmu_irqs_lock);
- WARN_ON(irq_set_affinity(irq->irq_num, cpumask_of(target)));
+ if (irq_set_affinity(irq->irq_num, cpumask_of(target)))
+ dev_err(dmc620_pmu->pmu.dev, "Failed to set interrupt affinity\n");
irq->cpu = target;
return 0;
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index 00d4c45a8017..05e1b3e274d7 100644
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -646,7 +646,8 @@ static int smmu_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
perf_pmu_migrate_context(&smmu_pmu->pmu, cpu, target);
smmu_pmu->on_cpu = target;
- WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(target)));
+ if (irq_set_affinity(smmu_pmu->irq, cpumask_of(target)))
+ dev_err(smmu_pmu->dev, "Failed to set interrupt affinity\n");
return 0;
}
@@ -892,7 +893,8 @@ static int smmu_pmu_probe(struct platform_device *pdev)
/* Pick one CPU to be the preferred one to use */
smmu_pmu->on_cpu = raw_smp_processor_id();
- WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(smmu_pmu->on_cpu)));
+ if (irq_set_affinity(smmu_pmu->irq, cpumask_of(smmu_pmu->on_cpu)))
+ dev_err(dev, "Failed to set interrupt affinity\n");
err = cpuhp_state_add_instance_nocalls(cpuhp_state_num,
&smmu_pmu->node);
diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 8e058e08fe81..c44192e2d9db 100644
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -671,7 +671,8 @@ static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node)
perf_pmu_migrate_context(&pmu->pmu, cpu, target);
pmu->cpu = target;
- WARN_ON(irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu)));
+ if (irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu)))
+ dev_err(pmu->dev, "Failed to set interrupt affinity\n");
return 0;
}
diff --git a/drivers/perf/hisilicon/hisi_pcie_pmu.c b/drivers/perf/hisilicon/hisi_pcie_pmu.c
index 21771708597d..90aed9e51396 100644
--- a/drivers/perf/hisilicon/hisi_pcie_pmu.c
+++ b/drivers/perf/hisilicon/hisi_pcie_pmu.c
@@ -655,7 +655,8 @@ static int hisi_pcie_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
if (pcie_pmu->on_cpu == -1) {
pcie_pmu->on_cpu = cpu;
- WARN_ON(irq_set_affinity(pcie_pmu->irq, cpumask_of(cpu)));
+ if (irq_set_affinity(pcie_pmu->irq, cpumask_of(cpu)))
+ pci_err(pcie_pmu->pdev, "Failed to set interrupt affinity\n");
}
return 0;
@@ -681,7 +682,8 @@ static int hisi_pcie_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
perf_pmu_migrate_context(&pcie_pmu->pmu, cpu, target);
/* Use this CPU for event counting */
pcie_pmu->on_cpu = target;
- WARN_ON(irq_set_affinity(pcie_pmu->irq, cpumask_of(target)));
+ if (irq_set_affinity(pcie_pmu->irq, cpumask_of(target)))
+ pci_err(pcie_pmu->pdev, "Failed to set interrupt affinity\n");
return 0;
}
diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c
index fbc8a93d5eac..74397b5ec889 100644
--- a/drivers/perf/hisilicon/hisi_uncore_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c
@@ -492,7 +492,8 @@ int hisi_uncore_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
hisi_pmu->on_cpu = cpu;
/* Overflow interrupt also should use the same CPU */
- WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(cpu)));
+ if (irq_set_affinity(hisi_pmu->irq, cpumask_of(cpu)))
+ dev_err(hisi_pmu->dev, "Failed to set interrupt affinity\n");
return 0;
}
@@ -525,7 +526,8 @@ int hisi_uncore_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
perf_pmu_migrate_context(&hisi_pmu->pmu, cpu, target);
/* Use this CPU for event counting */
hisi_pmu->on_cpu = target;
- WARN_ON(irq_set_affinity(hisi_pmu->irq, cpumask_of(target)));
+ if (irq_set_affinity(hisi_pmu->irq, cpumask_of(target)))
+ dev_err(hisi_pmu->dev, "Failed to set interrupt affinity\n");
return 0;
}
diff --git a/drivers/perf/qcom_l2_pmu.c b/drivers/perf/qcom_l2_pmu.c
index 30234c261b05..c6fe01c7e637 100644
--- a/drivers/perf/qcom_l2_pmu.c
+++ b/drivers/perf/qcom_l2_pmu.c
@@ -793,7 +793,9 @@ static int l2cache_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
cpumask_set_cpu(cpu, &l2cache_pmu->cpumask);
cluster_pmu_reset();
- WARN_ON(irq_set_affinity(cluster->irq, cpumask_of(cpu)));
+ if (irq_set_affinity(cluster->irq, cpumask_of(cpu)))
+ dev_err(&l2cache_pmu->pdev->dev,
+ "Failed to set interrupt affinity\n");
enable_irq(cluster->irq);
return 0;
@@ -831,7 +833,9 @@ static int l2cache_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
perf_pmu_migrate_context(&l2cache_pmu->pmu, cpu, target);
cluster->on_cpu = target;
cpumask_set_cpu(target, &l2cache_pmu->cpumask);
- WARN_ON(irq_set_affinity(cluster->irq, cpumask_of(target)));
+ if (irq_set_affinity(cluster->irq, cpumask_of(target)))
+ dev_err(&l2cache_pmu->pdev->dev,
+ "Failed to set interrupt affinity\n");
return 0;
}
diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index 0c32dffc7ede..f31e678fdb69 100644
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -1790,7 +1790,8 @@ static int xgene_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
cpumask_set_cpu(cpu, &xgene_pmu->cpu);
/* Overflow interrupt also should use the same CPU */
- WARN_ON(irq_set_affinity(xgene_pmu->irq, &xgene_pmu->cpu));
+ if (irq_set_affinity(xgene_pmu->irq, &xgene_pmu->cpu))
+ dev_err(xgene_pmu->dev, "Failed to set interrupt affinity\n");
return 0;
}
@@ -1823,7 +1824,8 @@ static int xgene_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
cpumask_set_cpu(target, &xgene_pmu->cpu);
/* Overflow interrupt also should use the same CPU */
- WARN_ON(irq_set_affinity(xgene_pmu->irq, &xgene_pmu->cpu));
+ if (irq_set_affinity(xgene_pmu->irq, &xgene_pmu->cpu))
+ dev_err(xgene_pmu->dev, "Failed to set interrupt affinity\n");
return 0;
}
--
2.24.0
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