linux-kernel - [RESEND PATCH] media: camss: vfe: Use trace

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Date:   Fri, 10 Jul 2020 14:47:51 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Andy Gross <agross@...nel.org>
Cc:     Nicolas Boichat <drinkcat@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: [RESEND PATCH] media: camss: vfe: Use trace_printk for debugging only

trace_printk should not be used in production code. Since
tracing interrupts is presumably latency sensitive, pr_dbg is
not appropriate, so guard the call with a preprocessor symbol
that can be defined for debugging purpose.

Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
---
Sent this before as part of a series (whose 4th patch was a
change that allows to detect such trace_printk), but maybe it's
easier to get individual maintainer attention by splitting it.

 drivers/media/platform/qcom/camss/camss-vfe-4-1.c | 2 ++
 drivers/media/platform/qcom/camss/camss-vfe-4-7.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
index 174a36be6f5d866..0c57171fae4f9e9 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
@@ -936,8 +936,10 @@ static irqreturn_t vfe_isr(int irq, void *dev)
 
 	vfe->ops->isr_read(vfe, &value0, &value1);
 
+#ifdef CAMSS_VFE_TRACE_IRQ
 	trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
 		     value0, value1);
+#endif
 
 	if (value0 & VFE_0_IRQ_STATUS_0_RESET_ACK)
 		vfe->isr_ops.reset_ack(vfe);
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
index 0dca8bf9281e774..307675925e5c779 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
@@ -1058,8 +1058,10 @@ static irqreturn_t vfe_isr(int irq, void *dev)
 
 	vfe->ops->isr_read(vfe, &value0, &value1);
 
+#ifdef CAMSS_VFE_TRACE_IRQ
 	trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
 		     value0, value1);
+#endif
 
 	if (value0 & VFE_0_IRQ_STATUS_0_RESET_ACK)
 		vfe->isr_ops.reset_ack(vfe);
-- 
2.27.0.383.g050319c2ae-goog