linux-kernel - [PATCH v2 1/4] perf: Fix potential compilation error with some compilers

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Date:	Fri, 18 Oct 2013 10:38:46 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	Waiman Long <Waiman.Long@...com>
Subject: [PATCH v2 1/4] perf: Fix potential compilation error with some compilers

The building of the perf tool failed in a SLES11 sp3 system with the
following compilation error:

cc1: warnings being treated as errors
util/scripting-engines/trace-event-perl.c: In function
‘perl_process_tracepoint’:
util/scripting-engines/trace-event-perl.c:285: error: format ‘%lu’
expects type ‘long unsigned int’, but argument 2 has type ‘__u64’

This patch replaces PRIu64 which is "lu" by the explicit "llu" to
fix this problem as __u64 is of type "long long unsigned".

Signed-off-by: Waiman Long <Waiman.Long@...com>
---
 .../perf/util/scripting-engines/trace-event-perl.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index a85e4ae..d6eb9c5 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -281,8 +281,12 @@ static void perl_process_tracepoint(union perf_event *perf_event __maybe_unused,
 		return;
 
 	event = find_cache_event(evsel);
+	/*
+	 * attr.config is a __u64 which requires "%llu" to avoid compilation
+	 * error/warning with some compilers.
+	 */
 	if (!event)
-		die("ug! no event found for type %" PRIu64, evsel->attr.config);
+		die("ug! no event found for type %llu", evsel->attr.config);
 
 	pid = raw_field_value(event, "common_pid", data);
 
-- 
1.7.1

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