linux-kernel - [PATCH v0 16/71] perf tools: Allow header->data

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Message-Id: <1386765443-26966-17-git-send-email-alexander.shishkin@linux.intel.com>
Date:	Wed, 11 Dec 2013 14:36:28 +0200
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH v0 16/71] perf tools: Allow header->data_offset to be predetermined

From: Adrian Hunter <adrian.hunter@...el.com>

It will be necessary to predetermine header->data_offset
to allow space for attributes that are added later.
Consequently, do not change header->data_offset if it
is non-zero.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/header.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 49c4896..0114f0a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2368,7 +2368,8 @@ int perf_session__write_header(struct perf_session *session,
 		}
 	}
 
-	header->data_offset = lseek(fd, 0, SEEK_CUR);
+	if (!header->data_offset)
+		header->data_offset = lseek(fd, 0, SEEK_CUR);
 	header->feat_offset = header->data_offset + header->data_size;
 
 	if (at_exit) {
-- 
1.8.5.1

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