perf map: Move comparision of map's dso_id to a separate function

We'll use it when doing DSO lookups using dso_ids.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-u2nr1oq03o0i29w2ay9jx03s@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/tools/perf/util/dsos.c b/tools/perf/util/dsos.c
index 3ea80d203587..ecf8d7346685 100644
--- a/tools/perf/util/dsos.c
+++ b/tools/perf/util/dsos.c
@@ -2,6 +2,7 @@
 #include "debug.h"
 #include "dsos.h"
 #include "dso.h"
+#include "map.h"
 #include "vdso.h"
 #include "namespaces.h"
 #include <libgen.h>
@@ -9,6 +10,30 @@
 #include <string.h>
 #include <symbol.h> // filename__read_build_id
 
+int dso_id__cmp(struct dso_id *a, struct dso_id *b)
+{
+	/*
+	 * The second is always dso->id, so zeroes if not set, assume passing
+	 * NULL for a means a zeroed id
+	 */
+	if (a == NULL)
+		return 0;
+
+	if (a->maj > b->maj) return -1;
+	if (a->maj < b->maj) return 1;
+
+	if (a->min > b->min) return -1;
+	if (a->min < b->min) return 1;
+
+	if (a->ino > b->ino) return -1;
+	if (a->ino < b->ino) return 1;
+
+	if (a->ino_generation > b->ino_generation) return -1;
+	if (a->ino_generation < b->ino_generation) return 1;
+
+	return 0;
+}
+
 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
 {
 	bool have_build_id = false;