[PATCH bpf-next] bpf, selftests: test_maps generating unrecognized data section

[John Fastabend <john.fastabend@gmail.com>]

With a relatively recent clang master branch test_map skips a section,

 libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1

the cause is some pointless strings from bpf_printks in the BPF program
loaded during testing. After just removing the prints to fix above
error Daniel points out the program is a bit pointless and could
be simply the empty program returning SK_PASS.

Here we do just that and return simply SK_PASS. This program is used with
test_maps selftests to test insert/remove of a program into the sockmap
and sockhash maps. Its not testing actual functionality of the TCP sockmap
programs, these are tested from test_sockmap. So we shouldn't lose in
test coverage and fix above warnings. This original test was added before
test_sockmap existed and has been copied around ever since, clean it up
now.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---
 .../selftests/bpf/progs/sockmap_tcp_msg_prog.c     |   12 ------------
 1 file changed, 12 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c b/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c
index fdb4bf4408fa..eeaf6e75c9a2 100644
--- a/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c
+++ b/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c
@@ -8,18 +8,6 @@ int _version SEC("version") = 1;
 SEC("sk_msg1")
 int bpf_prog1(struct sk_msg_md *msg)
 {
-	void *data_end = (void *)(long) msg->data_end;
-	void *data = (void *)(long) msg->data;
-
-	char *d;
-
-	if (data + 8 > data_end)
-		return SK_DROP;
-
-	bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
-	d = (char *)data;
-	bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
-
 	return SK_PASS;
 }