[PATCH bpf-next 2/4] selftests/bpf: Add assertions for bpf_program__{add,clear}_flags()

[Toke Høiland-Jørgensen]

Add assertions that round-tripping through bpf_program__add_flags() and
bpf_program__clear_flags() ends up with the original flags value.
Arbitrarily add these to the kernel_flag test prog since that's where
we're already checking for the bpf_program__flags() value (and the test
name contains "flag").

Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
---
 .../selftests/bpf/prog_tests/kernel_flag.c    | 20 +++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/kernel_flag.c b/tools/testing/selftests/bpf/prog_tests/kernel_flag.c
index 25eb59f460ab..72c0ef8da409 100644
--- a/tools/testing/selftests/bpf/prog_tests/kernel_flag.c
+++ b/tools/testing/selftests/bpf/prog_tests/kernel_flag.c
@@ -10,15 +10,31 @@ void test_kernel_flag(void)
 	struct test_kernel_flag *lsm_skel;
 	struct kfunc_call_test *skel = NULL;
 	struct kfunc_call_test_lskel *lskel = NULL;
+	struct bpf_program *prog;
+	__u32 flags;
 	int ret;
 
-	lsm_skel = test_kernel_flag__open_and_load();
+	lsm_skel = test_kernel_flag__open();
 	if (!ASSERT_OK_PTR(lsm_skel, "lsm_skel"))
 		return;
 
-	ASSERT_EQ(bpf_program__flags(lsm_skel->progs.bpf) & BPF_F_SLEEPABLE,
+	prog = lsm_skel->progs.bpf;
+	flags = bpf_program__flags(prog);
+	ASSERT_EQ(flags & BPF_F_SLEEPABLE,
 		  BPF_F_SLEEPABLE, "sleepable in program flags");
 
+	ret = bpf_program__add_flags(prog, BPF_F_ANY_ALIGNMENT);
+	ASSERT_OK(ret, "bpf_program__add_flags ret");
+	ASSERT_EQ(bpf_program__flags(prog), flags | BPF_F_ANY_ALIGNMENT,
+		  "bpf_program__add_flags value");
+
+	ret = bpf_program__clear_flags(prog, BPF_F_ANY_ALIGNMENT);
+	ASSERT_OK(ret, "bpf_program__clear_flags ret");
+	ASSERT_EQ(bpf_program__flags(prog), flags, "bpf_program__clear_flags value");
+
+	ret = test_kernel_flag__load(lsm_skel);
+	ASSERT_OK(ret, "test_kernel_flag__load");
+
 	lsm_skel->bss->monitored_tid = sys_gettid();
 
 	ret = test_kernel_flag__attach(lsm_skel);
-- 
2.55.0