[PATCH v0 16/71] perf tools: Allow header->data_offset to be predetermined

[Alexander Shishkin]

From: Adrian Hunter <adrian.hunter@xxxxxxxxx>

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@xxxxxxxxx>
---
 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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