linux-kernel - [PATCH] drivers/perf: Replace spin_lock_irqsave to spin

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Date:   Tue, 9 Feb 2021 17:42:22 +0800
From:   Qi Liu <liuqi115@...wei.com>
To:     <will@...nel.org>, <mark.rutland@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>
Subject: [PATCH] drivers/perf: Replace spin_lock_irqsave to spin_lock

There is no need to do spin_lock_irqsave in context of hard IRQ, so
replace them with spin_lock.

Signed-off-by: Qi Liu <liuqi115@...wei.com>
---
 drivers/perf/arm-cci.c   | 5 ++---
 drivers/perf/xgene_pmu.c | 5 ++---
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index a75cf77..f81e2ec 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1026,12 +1026,11 @@ static void pmu_event_set_period(struct perf_event *event)

 static irqreturn_t pmu_handle_irq(int irq_num, void *dev)
 {
-	unsigned long flags;
 	struct cci_pmu *cci_pmu = dev;
 	struct cci_pmu_hw_events *events = &cci_pmu->hw_events;
 	int idx, handled = IRQ_NONE;

-	raw_spin_lock_irqsave(&events->pmu_lock, flags);
+	raw_spin_lock(&events->pmu_lock);

 	/* Disable the PMU while we walk through the counters */
 	__cci_pmu_disable(cci_pmu);
@@ -1061,7 +1060,7 @@ static irqreturn_t pmu_handle_irq(int irq_num, void *dev)

 	/* Enable the PMU and sync possibly overflowed counters */
 	__cci_pmu_enable_sync(cci_pmu);
-	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
+	raw_spin_unlock(&events->pmu_lock);

 	return IRQ_RETVAL(handled);
 }
diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index 633cf07..44faa51 100644
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -1234,10 +1234,9 @@ static irqreturn_t xgene_pmu_isr(int irq, void *dev_id)
 	u32 intr_mcu, intr_mcb, intr_l3c, intr_iob;
 	struct xgene_pmu_dev_ctx *ctx;
 	struct xgene_pmu *xgene_pmu = dev_id;
-	unsigned long flags;
 	u32 val;

-	raw_spin_lock_irqsave(&xgene_pmu->lock, flags);
+	raw_spin_lock(&xgene_pmu->lock);

 	/* Get Interrupt PMU source */
 	val = readl(xgene_pmu->pcppmu_csr + PCPPMU_INTSTATUS_REG);
@@ -1273,7 +1272,7 @@ static irqreturn_t xgene_pmu_isr(int irq, void *dev_id)
 		}
 	}

-	raw_spin_unlock_irqrestore(&xgene_pmu->lock, flags);
+	raw_spin_unlock(&xgene_pmu->lock);

 	return IRQ_HANDLED;
 }
--
2.8.1