ftrace: avoid duplicated function when writing set_graph_function
Impact: fix a bug in function filter setting
when writing function to set_graph_function, we should check whether it
has existed in set_graph_function to avoid duplicating.
Signed-off-by: Liming Wang <liming.wang@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eb57dc1..d2b1565 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1425,7 +1425,7 @@
struct dyn_ftrace *rec;
struct ftrace_page *pg;
int found = 0;
- int i;
+ int i, j;
if (ftrace_disabled)
return -ENODEV;
@@ -1443,7 +1443,13 @@
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
if (strcmp(str, buffer) == 0) {
found = 1;
- array[idx] = rec->ip;
+ for (j = 0; j < idx; j++)
+ if (array[j] == rec->ip) {
+ found = 0;
+ break;
+ }
+ if (found)
+ array[idx] = rec->ip;
break;
}
}