linux-kernel - [tip:perf/core] perf tools: Change perf_mem__lck_scnprintf to return nb of displayed bytes

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Message-ID: <tip-8b0819c8a3c97279b815581b606407c0387cc26f@git.kernel.org>
Date:	Wed, 24 Feb 2016 23:39:28 -0800
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	dsahern@...il.com, hpa@...or.com, jolsa@...nel.org,
	mingo@...nel.org, namhyung@...nel.org,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	eranian@...gle.com, acme@...hat.com, tglx@...utronix.de,
	ak@...ux.intel.com
Subject: [tip:perf/core] perf tools: Change perf_mem__lck_scnprintf to
 return nb of displayed bytes

Commit-ID:  8b0819c8a3c97279b815581b606407c0387cc26f
Gitweb:     http://git.kernel.org/tip/8b0819c8a3c97279b815581b606407c0387cc26f
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Wed, 24 Feb 2016 09:46:53 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 24 Feb 2016 10:31:03 -0300

perf tools: Change perf_mem__lck_scnprintf to return nb of displayed bytes

Moving strncat call into scnprintf to easily track number of displayed
bytes. It will be used in following patch.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1456303616-26926-13-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/mem-events.c | 12 +++++++-----
 tools/perf/util/mem-events.h |  2 +-
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index de981dd..eadb83d 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -221,18 +221,20 @@ int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 	return l;
 }
 
-void perf_mem__lck_scnprintf(char *out, size_t sz __maybe_unused,
-			     struct mem_info *mem_info)
+int perf_mem__lck_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 {
 	u64 mask = PERF_MEM_LOCK_NA;
+	int l;
 
 	if (mem_info)
 		mask = mem_info->data_src.mem_lock;
 
 	if (mask & PERF_MEM_LOCK_NA)
-		strncat(out, "N/A", 3);
+		l = scnprintf(out, sz, "N/A");
 	else if (mask & PERF_MEM_LOCK_LOCKED)
-		strncat(out, "Yes", 3);
+		l = scnprintf(out, sz, "Yes");
 	else
-		strncat(out, "No", 2);
+		l = scnprintf(out, sz, "No");
+
+	return l;
 }
diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index 84c79a4..87c44ff 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -28,6 +28,6 @@ struct mem_info;
 int perf_mem__tlb_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
-void perf_mem__lck_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
+int perf_mem__lck_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
 
 #endif /* __PERF_MEM_EVENTS_H */