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-rw-r--r--kernel/trace/trace_kprobe.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index a2af1bceca29..a133ecd741e4 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1361,18 +1361,18 @@ fs_initcall(init_kprobe_trace);
#ifdef CONFIG_FTRACE_STARTUP_TEST
-
/*
* The "__used" keeps gcc from removing the function symbol
- * from the kallsyms table.
+ * from the kallsyms table. 'noinline' makes sure that there
+ * isn't an inlined version used by the test method below
*/
-static __used int kprobe_trace_selftest_target(int a1, int a2, int a3,
- int a4, int a5, int a6)
+static __used __init noinline int
+kprobe_trace_selftest_target(int a1, int a2, int a3, int a4, int a5, int a6)
{
return a1 + a2 + a3 + a4 + a5 + a6;
}
-static struct trace_event_file *
+static struct __init trace_event_file *
find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr)
{
struct trace_event_file *file;
@@ -1450,12 +1450,25 @@ static __init int kprobe_trace_self_tests_init(void)
ret = target(1, 2, 3, 4, 5, 6);
+ /*
+ * Not expecting an error here, the check is only to prevent the
+ * optimizer from removing the call to target() as otherwise there
+ * are no side-effects and the call is never performed.
+ */
+ if (ret != 21)
+ warn++;
+
/* Disable trace points before removing it */
tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM);
if (WARN_ON_ONCE(tk == NULL)) {
pr_warn("error on getting test probe.\n");
warn++;
} else {
+ if (trace_kprobe_nhit(tk) != 1) {
+ pr_warn("incorrect number of testprobe hits\n");
+ warn++;
+ }
+
file = find_trace_probe_file(tk, top_trace_array());
if (WARN_ON_ONCE(file == NULL)) {
pr_warn("error on getting probe file.\n");
@@ -1469,6 +1482,11 @@ static __init int kprobe_trace_self_tests_init(void)
pr_warn("error on getting 2nd test probe.\n");
warn++;
} else {
+ if (trace_kprobe_nhit(tk) != 1) {
+ pr_warn("incorrect number of testprobe2 hits\n");
+ warn++;
+ }
+
file = find_trace_probe_file(tk, top_trace_array());
if (WARN_ON_ONCE(file == NULL)) {
pr_warn("error on getting probe file.\n");