[PATCH 04/23] perf tools: Introduce feat_offset into perf_header

[Jiri Olsa]

Introducing feat_offset into perf_header to make the
location of the features section clear.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
---
 tools/perf/util/header.c | 6 ++++--
 tools/perf/util/header.h | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index dcba56a..eefb052 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2225,7 +2225,7 @@ static int perf_header__adds_write(struct perf_header *header,
 
 	sec_size = sizeof(*feat_sec) * nr_sections;
 
-	sec_start = header->data_offset + header->data_size;
+	sec_start = header->feat_offset;
 	lseek(fd, sec_start + sec_size, SEEK_SET);
 
 	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
@@ -2304,6 +2304,7 @@ int perf_session__write_header(struct perf_session *session,
 	}
 
 	header->data_offset = lseek(fd, 0, SEEK_CUR);
+	header->feat_offset = header->data_offset + header->data_size;
 
 	if (at_exit) {
 		err = perf_header__adds_write(header, evlist, fd);
@@ -2373,7 +2374,7 @@ int perf_header__process_sections(struct perf_header *header, int fd,
 
 	sec_size = sizeof(*feat_sec) * nr_sections;
 
-	lseek(fd, header->data_offset + header->data_size, SEEK_SET);
+	lseek(fd, header->feat_offset, SEEK_SET);
 
 	err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
 	if (err < 0)
@@ -2572,6 +2573,7 @@ int perf_file_header__read(struct perf_file_header *header,
 
 	ph->data_offset  = header->data.offset;
 	ph->data_size	 = header->data.size;
+	ph->feat_offset  = header->data.offset + header->data.size;
 	return 0;
 }
 
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 6fa80f9..e6387dc 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -88,6 +88,7 @@ struct perf_header {
 	bool			needs_swap;
 	u64			data_offset;
 	u64			data_size;
+	u64			feat_offset;
 	DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
 	struct perf_session_env env;
 };
-- 
1.7.11.7

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