perf session: Adopt the sample_type variable

All tools had copies, and perf diff would have to specify a
sample_type_check method just for copying it.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260807780-19377-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index a8f3a49..4e8a21c 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -19,6 +19,7 @@
 	struct rb_root		threads;
 	struct thread		*last_match;
 	struct rb_root		hists;
+	u64			sample_type;
 	int			fd;
 	int			cwdlen;
 	char			*cwd;
@@ -39,8 +40,7 @@
 	event_op	process_read_event;
 	event_op	process_throttle_event;
 	event_op	process_unthrottle_event;
-	int		(*sample_type_check)(u64 sample_type,
-					     struct perf_session *session);
+	int		(*sample_type_check)(struct perf_session *session);
 	unsigned long	total_unknown;
 	bool		full_paths;
 };