linux-kernel - [tip:perf/core] perf tools: Remove newline char when reading event scale and unit

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Message-ID: <tip-9ecae065f3295d7ea5e1c5492170a848ca255a46@git.kernel.org>
Date:	Thu, 4 Jun 2015 07:10:41 -0700
From:	tip-bot for Madhavan Srinivasan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...hat.com, tglx@...utronix.de, acme@...hat.com,
	sukadev@...ux.vnet.ibm.com, mingo@...nel.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org, maddy@...ux.vnet.ibm.com,
	hpa@...or.com, mpe@...erman.id.au
Subject: [tip:perf/core] perf tools:
  Remove newline char when reading event scale and unit

Commit-ID:  9ecae065f3295d7ea5e1c5492170a848ca255a46
Gitweb:     http://git.kernel.org/tip/9ecae065f3295d7ea5e1c5492170a848ca255a46
Author:     Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
AuthorDate: Sun, 31 May 2015 11:36:23 +0530
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 1 Jun 2015 10:26:19 -0300

perf tools: Remove newline char when reading event scale and unit

The <fd979c013207> commit intruduced the perf_event_sysfs_show function
to display the event_str value of an attr in kernel/event/core.c. But
the function returns the value with a newline char.

So, if a event also carries a event.unit file, when printing the counter
data perf tool formatting goes for a spin.

That is, because of the event unit, event name is printed in the newline
because of perf_event_sysfs_show returns with a newline char.

Now fixing perf core will break API, hencing proposing a fix in the perf tool.

Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1433052383-21802-1-git-send-email-maddy@linux.vnet.ibm.com
[ Add spaces around operators ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/pmu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 5d3ab7c..0fcc624 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -112,7 +112,11 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
 	if (sret < 0)
 		goto error;
 
-	scale[sret] = '\0';
+	if (scale[sret - 1] == '\n')
+		scale[sret - 1] = '\0';
+	else
+		scale[sret] = '\0';
+
 	/*
 	 * save current locale
 	 */
@@ -154,7 +158,10 @@ static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *n
 
 	close(fd);
 
-	alias->unit[sret] = '\0';
+	if (alias->unit[sret - 1] == '\n')
+		alias->unit[sret - 1] = '\0';
+	else
+		alias->unit[sret] = '\0';
 
 	return 0;
 error:
--
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