1 files changed, 18 insertions, 2 deletions

diff --git a/tools/testing/selftests/bpf/test_stacktrace_build_id.c b/tools/testing/selftests/bpf/test_stacktrace_build_id.c
index b755bd783ce5..d86c281e957f 100644
--- a/tools/testing/selftests/bpf/test_stacktrace_build_id.c
+++ b/tools/testing/selftests/bpf/test_stacktrace_build_id.c
@@ -19,7 +19,7 @@ struct bpf_map_def SEC("maps") stackid_hmap = {
         .type = BPF_MAP_TYPE_HASH,
         .key_size = sizeof(__u32),
         .value_size = sizeof(__u32),
-        .max_entries = 10000,
+        .max_entries = 16384,
 };
 
 struct bpf_map_def SEC("maps") stackmap = {
@@ -31,6 +31,14 @@ struct bpf_map_def SEC("maps") stackmap = {
         .map_flags = BPF_F_STACK_BUILD_ID,
 };
 
+struct bpf_map_def SEC("maps") stack_amap = {
+        .type = BPF_MAP_TYPE_ARRAY,
+        .key_size = sizeof(__u32),
+        .value_size = sizeof(struct bpf_stack_build_id)
+                * PERF_MAX_STACK_DEPTH,
+        .max_entries = 128,
+};
+
 /* taken from /sys/kernel/debug/tracing/events/random/urandom_read/format */
 struct random_urandom_args {
         unsigned long long pad;
@@ -42,7 +50,10 @@ struct random_urandom_args {
 SEC("tracepoint/random/urandom_read")
 int oncpu(struct random_urandom_args *args)
 {
+        __u32 max_len = sizeof(struct bpf_stack_build_id)
+                        * PERF_MAX_STACK_DEPTH;
         __u32 key = 0, val = 0, *value_p;
+        void *stack_p;
 
         value_p = bpf_map_lookup_elem(&control_map, &key);
         if (value_p && *value_p)
@@ -50,8 +61,13 @@ int oncpu(struct random_urandom_args *args)
 
         /* The size of stackmap and stackid_hmap should be the same */
         key = bpf_get_stackid(args, &stackmap, BPF_F_USER_STACK);
-        if ((int)key >= 0)
+        if ((int)key >= 0) {
                 bpf_map_update_elem(&stackid_hmap, &key, &val, 0);
+                stack_p = bpf_map_lookup_elem(&stack_amap, &key);
+                if (stack_p)
+                        bpf_get_stack(args, stack_p, max_len,
+                                      BPF_F_USER_STACK | BPF_F_USER_BUILD_ID);
+        }
 
         return 0;
 }