[tip:perf/core] perf tools: Add __data_loc support

[tip-bot for Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>]

Commit-ID:  86d8d29634de4464d568e7c335c0da6cba64e8ab
Gitweb:     http://git.kernel.org/tip/86d8d29634de4464d568e7c335c0da6cba64e8ab
Author:     Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
AuthorDate: Sat, 30 Jan 2010 20:43:23 +0900
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 31 Jan 2010 08:27:52 +0100

perf tools: Add __data_loc support

This patch is required to test the next patch for perf lock.

At 064739bc4b3d7f424b2f25547e6611bcf0132415 ,
support for the modifier "__data_loc" of format is added.

But, when I wanted to parse format of lock_acquired (or some
event else), raw_field_ptr() did not returned correct pointer.

So I modified raw_field_ptr() like this patch. Then
raw_field_ptr() works well.

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
LKML-Reference: <1264851813-8413-2-git-send-email-mitake@dcl.info.waseda.ac.jp>
[ v3: fixed minor stylistic detail ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 tools/perf/util/trace-event-parse.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index c5c32be..c4b3cb8 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -1925,6 +1925,15 @@ void *raw_field_ptr(struct event *event, const char *name, void *data)
 	if (!field)
 		return NULL;
 
+	if (field->flags & FIELD_IS_STRING) {
+		int offset;
+
+		offset = *(int *)(data + field->offset);
+		offset &= 0xffff;
+
+		return data + offset;
+	}
+
 	return data + field->offset;
 }