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-rw-r--r--tools/perf/util/sort.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index eab2e0b3b74e..0d61c4082f43 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -25,10 +25,10 @@
#include "sort.h"
extern regex_t parent_regex;
-extern char *sort_order;
-extern char default_parent_pattern[];
-extern char *parent_pattern;
-extern char default_sort_order[];
+extern const char *sort_order;
+extern const char default_parent_pattern[];
+extern const char *parent_pattern;
+extern const char default_sort_order[];
extern int sort__need_collapse;
extern int sort__has_parent;
extern char *field_sep;