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From: Leo Yan <leo.yan@linaro.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Coresight ML <coresight@lists.linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Subject: [PATCH] coresight: tmc: Refactor loops in etb dump
Date: Wed,  5 Sep 2018 18:09:07 +0800	[thread overview]
Message-ID: <1536142147-21323-1-git-send-email-leo.yan@linaro.org> (raw)

In ETB dump function tmc_etb_dump_hw() it has nested loops.  The second
level loop is to iterate index in the range [0 .. drvdata->memwidth);
but the index isn't really used in the code, thus the second level
loop is useless.

This patch is to remove the second level loop; the refactor also reduces
indentation and we can use 'break' to replace 'goto' tag.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 drivers/hwtracing/coresight/coresight-tmc-etf.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 9c599c9..8b34161 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -34,23 +34,20 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
 {
 	char *bufp;
 	u32 read_data, lost;
-	int i;
 
 	/* Check if the buffer wrapped around. */
 	lost = readl_relaxed(drvdata->base + TMC_STS) & TMC_STS_FULL;
 	bufp = drvdata->buf;
 	drvdata->len = 0;
 	while (1) {
-		for (i = 0; i < drvdata->memwidth; i++) {
-			read_data = readl_relaxed(drvdata->base + TMC_RRD);
-			if (read_data == 0xFFFFFFFF)
-				goto done;
-			memcpy(bufp, &read_data, 4);
-			bufp += 4;
-			drvdata->len += 4;
-		}
+		read_data = readl_relaxed(drvdata->base + TMC_RRD);
+		if (read_data == 0xFFFFFFFF)
+			break;
+		memcpy(bufp, &read_data, 4);
+		bufp += 4;
+		drvdata->len += 4;
 	}
-done:
+
 	if (lost)
 		coresight_insert_barrier_packet(drvdata->buf);
 	return;
-- 
2.7.4


WARNING: multiple messages have this Message-ID (diff)
From: leo.yan@linaro.org (Leo Yan)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] coresight: tmc: Refactor loops in etb dump
Date: Wed,  5 Sep 2018 18:09:07 +0800	[thread overview]
Message-ID: <1536142147-21323-1-git-send-email-leo.yan@linaro.org> (raw)

In ETB dump function tmc_etb_dump_hw() it has nested loops.  The second
level loop is to iterate index in the range [0 .. drvdata->memwidth);
but the index isn't really used in the code, thus the second level
loop is useless.

This patch is to remove the second level loop; the refactor also reduces
indentation and we can use 'break' to replace 'goto' tag.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 drivers/hwtracing/coresight/coresight-tmc-etf.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 9c599c9..8b34161 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -34,23 +34,20 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
 {
 	char *bufp;
 	u32 read_data, lost;
-	int i;
 
 	/* Check if the buffer wrapped around. */
 	lost = readl_relaxed(drvdata->base + TMC_STS) & TMC_STS_FULL;
 	bufp = drvdata->buf;
 	drvdata->len = 0;
 	while (1) {
-		for (i = 0; i < drvdata->memwidth; i++) {
-			read_data = readl_relaxed(drvdata->base + TMC_RRD);
-			if (read_data == 0xFFFFFFFF)
-				goto done;
-			memcpy(bufp, &read_data, 4);
-			bufp += 4;
-			drvdata->len += 4;
-		}
+		read_data = readl_relaxed(drvdata->base + TMC_RRD);
+		if (read_data == 0xFFFFFFFF)
+			break;
+		memcpy(bufp, &read_data, 4);
+		bufp += 4;
+		drvdata->len += 4;
 	}
-done:
+
 	if (lost)
 		coresight_insert_barrier_packet(drvdata->buf);
 	return;
-- 
2.7.4

             reply	other threads:[~2018-09-05 10:09 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-05 10:09 Leo Yan [this message]
2018-09-05 10:09 ` [PATCH] coresight: tmc: Refactor loops in etb dump Leo Yan
2018-09-10 17:17 ` Mathieu Poirier
2018-09-10 17:17   ` Mathieu Poirier

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