perf ftrace: Factor out function write_tracing_file_int()

We will reuse this function later.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lore.kernel.org/lkml/20200808023141.14227-4-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 1ebf71e..4b3fcee 100644 (file)
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -169,6 +169,17 @@ out:
        return ret;
 }
 
+static int write_tracing_file_int(const char *name, int value)
+{
+       char buf[16];
+
+       snprintf(buf, sizeof(buf), "%d", value);
+       if (write_tracing_file(name, buf) < 0)
+               return -1;
+
+       return 0;
+}
+
 static int reset_tracing_cpu(void);
 static void reset_tracing_filters(void);
 
@@ -299,8 +310,6 @@ static void reset_tracing_filters(void)
 
 static int set_tracing_depth(struct perf_ftrace *ftrace)
 {
-       char buf[16];
-
        if (ftrace->graph_depth == 0)
                return 0;
 
@@ -309,9 +318,7 @@ static int set_tracing_depth(struct perf_ftrace *ftrace)
                return -1;
        }
 
-       snprintf(buf, sizeof(buf), "%d", ftrace->graph_depth);
-
-       if (write_tracing_file("max_graph_depth", buf) < 0)
+       if (write_tracing_file_int("max_graph_depth", ftrace->graph_depth) < 0)
                return -1;
 
        return 0;