[PATCH bpf-next v2 1/3] selftests/bpf: Print log buffer for exceptions test only on failure

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

Alexei reported seeing log messages for some test cases even though we
just wanted to match the error string from the verifier. Move the
printing of the log buffer to a guarded condition so that we only print
it when we fail to match on the expected string in the log buffer,
preventing unneeded output when running the test.

Reported-by: Alexei Starovoitov <ast@kernel.org>
Fixes: d2a93715bfb0 ("selftests/bpf: Add tests for BPF exceptions")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/testing/selftests/bpf/prog_tests/exceptions.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/exceptions.c b/tools/testing/selftests/bpf/prog_tests/exceptions.c
index 5663e427dc00..516f4a13013c 100644
--- a/tools/testing/selftests/bpf/prog_tests/exceptions.c
+++ b/tools/testing/selftests/bpf/prog_tests/exceptions.c
@@ -103,9 +103,10 @@ static void test_exceptions_success(void)
 			goto done;						  \
 		}								  \
 		if (load_ret != 0) {						  \
-			printf("%s\n", log_buf);				  \
-			if (!ASSERT_OK_PTR(strstr(log_buf, msg), "strstr"))	  \
+			if (!ASSERT_OK_PTR(strstr(log_buf, msg), "strstr")) {	  \
+				printf("%s\n", log_buf);			  \
 				goto done;					  \
+			}							  \
 		}								  \
 		if (!load_ret && attach_err) {					  \
 			if (!ASSERT_ERR_PTR(link = bpf_program__attach(prog), "attach err")) \
-- 
2.41.0