[PATCH RFC bpf-next 3/3] selftests/bpf: Test jited inline of bpf_get_smp_processor_id()

[Tiezhu Yang]

Add the testcase for the jited inline of bpf_get_smp_processor_id(),
only for LoongArch currently.

Here is the test result on LoongArch:

  $ sudo ./test_progs -t verifier_jit_inline
  #570/1   verifier_jit_inline/inline_bpf_get_current_task:OK
  #570/2   verifier_jit_inline/inline_bpf_get_smp_processor_id:OK
  #570     verifier_jit_inline:OK
  Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED

Note that this test will pass only after the JIT inline support for
bpf_get_smp_processor_id is merged. While the JIT inlining is still
in the pipeline, adding the changes now will not introduce any build
regressions. It serves to define the expected JIT output for future
validation.

Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
 .../testing/selftests/bpf/progs/verifier_jit_inline.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
index 913a1699e42b..e4d683c8cb06 100644
--- a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
+++ b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
@@ -19,4 +19,15 @@ int inline_bpf_get_current_task(void)
 	return 0;
 }
 
+SEC("fentry/bpf_fentry_test2")
+__success __retval(0)
+__arch_loongarch
+__jited("	ld.w	$a5, $tp, 8")
+int inline_bpf_get_smp_processor_id(void)
+{
+	bpf_get_smp_processor_id();
+
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
-- 
2.42.0