[PATCH V2 1/6] perf tools: Add machine to machines back pointer

[Adrian Hunter <adrian.hunter@intel.com>]

When dealing with guest machines, it can be necessary to get a reference
to the host machine. Add a machines pointer to struct machine to make that
possible.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/machine.c | 2 ++
 tools/perf/util/machine.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 95391236f5f6..e96f6ea4fd82 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -299,6 +299,8 @@ struct machine *machines__add(struct machines *machines, pid_t pid,
 	rb_link_node(&machine->rb_node, parent, p);
 	rb_insert_color_cached(&machine->rb_node, &machines->guests, leftmost);
 
+	machine->machines = machines;
+
 	return machine;
 }
 
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 0023165422aa..0d113771e8c8 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -18,6 +18,7 @@ struct symbol;
 struct target;
 struct thread;
 union perf_event;
+struct machines;
 
 /* Native host kernel uses -1 as pid index in machine */
 #define	HOST_KERNEL_ID			(-1)
@@ -59,6 +60,7 @@ struct machine {
 		void	  *priv;
 		u64	  db_id;
 	};
+	struct machines   *machines;
 	bool		  trampolines_mapped;
 };
 
-- 
2.25.1