linux-kernel - [PATCH 06/11] coresight-etm: Fix initial trace ID value

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Date:	Fri,  9 Jan 2015 16:57:17 -0700
From:	mathieu.poirier@...aro.org
To:	gregkh@...uxfoundation.org
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	mathieu.poirier@...aro.org
Subject: [PATCH 06/11] coresight-etm: Fix initial trace ID value

From: Mathieu Poirier <mathieu.poirier@...aro.org>

The coresight TRM specify that a component's trace ID should
be other than 0.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/coresight/coresight-etm3x.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/coresight/coresight-etm3x.c b/drivers/coresight/coresight-etm3x.c
index 369cac00afaa..73c36696f1b6 100644
--- a/drivers/coresight/coresight-etm3x.c
+++ b/drivers/coresight/coresight-etm3x.c
@@ -1749,7 +1749,11 @@ static void etm_init_arch_data(void *info)
 
 static void etm_init_default_data(struct etm_drvdata *drvdata)
 {
-	static int etm3x_traceid;
+	/*
+	 * A trace ID of value 0 is invalid, so let's start at some
+	 * random value that fits in 7 bits and will be just as good.
+	 */
+	static int etm3x_traceid = 0x10;
 
 	u32 flags = (1 << 0 | /* instruction execute*/
 		     3 << 3 | /* ARM instruction */
-- 
1.9.1

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