perf hists: Introduce perf_hpp_list__for_each_sort_list_safe macro

Introducing perf_hpp_list__for_each_sort_list_safe macro
to iterate perf_hpp_list object's sort entries safely.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1453109064-1026-23-git-send-email-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/hist.c

@@ -604,7 +604,7 @@ void perf_hpp__reset_output_field(void)
 	}
 
 	/* reset sort keys */
-	perf_hpp__for_each_sort_list_safe(fmt, tmp) {
+	perf_hpp_list__for_each_sort_list_safe(&perf_hpp_list, fmt, tmp) {
 		list_del_init(&fmt->list);
 		list_del_init(&fmt->sort_list);
 		fmt_free(fmt);

tools/perf/util/hist.h

@@ -257,8 +257,8 @@ static inline void perf_hpp__register_sort_field(struct perf_hpp_fmt *format)
 #define perf_hpp_list__for_each_sort_list(_list, format) \
 	list_for_each_entry(format, &(_list)->sorts, sort_list)
 
-#define perf_hpp__for_each_sort_list_safe(format, tmp)	\
-	list_for_each_entry_safe(format, tmp, &perf_hpp_list.sorts, sort_list)
+#define perf_hpp_list__for_each_sort_list_safe(_list, format, tmp)	\
+	list_for_each_entry_safe(format, tmp, &(_list)->sorts, sort_list)
 
 extern struct perf_hpp_fmt perf_hpp__format[];