selftest/bpf: Add a test case for ld_imm64 copy logic.

Add a test case to exercise {btf_id, btf_obj_fd} copy logic between ld_imm64 insns.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230319203014.55866-2-alexei.starovoitov@gmail.com

diff --git a/tools/testing/selftests/bpf/progs/test_ksyms_weak.c b/tools/testing/selftests/bpf/progs/test_ksyms_weak.c
index 5f8379a..7003eef 100644 (file)
--- a/tools/testing/selftests/bpf/progs/test_ksyms_weak.c
+++ b/tools/testing/selftests/bpf/progs/test_ksyms_weak.c
@@ -37,7 +37,7 @@ int pass_handler(const void *ctx)
 
        /* tests existing symbols. */
        rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0);
-       if (rq)
+       if (rq && bpf_ksym_exists(&runqueues))
                out__existing_typed = rq->cpu;
        out__existing_typeless = (__u64)&bpf_prog_active;