1 files changed, 36 insertions, 1 deletions

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 1958637cf136..289df9d1e65a 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -1446,12 +1446,47 @@ static const char *get_default_sort_order(void)
         return default_sort_orders[sort__mode];
 }
 
+static int setup_sort_order(void)
+{
+        char *new_sort_order;
+
+        /*
+         * Append '+'-prefixed sort order to the default sort
+         * order string.
+         */
+        if (!sort_order || is_strict_order(sort_order))
+                return 0;
+
+        if (sort_order[1] == '\0') {
+                error("Invalid --sort key: `+'");
+                return -EINVAL;
+        }
+
+        /*
+         * We allocate new sort_order string, but we never free it,
+         * because it's checked over the rest of the code.
+         */
+        if (asprintf(&new_sort_order, "%s,%s",
+                     get_default_sort_order(), sort_order + 1) < 0) {
+                error("Not enough memory to set up --sort");
+                return -ENOMEM;
+        }
+
+        sort_order = new_sort_order;
+        return 0;
+}
+
 static int __setup_sorting(void)
 {
         char *tmp, *tok, *str;
-        const char *sort_keys = sort_order;
+        const char *sort_keys;
         int ret = 0;
 
+        ret = setup_sort_order();
+        if (ret)
+                return ret;
+
+        sort_keys = sort_order;
         if (sort_keys == NULL) {
                 if (is_strict_order(field_order)) {
                         /*