selftests/bpf: Rename fallback in bpf_dctcp to avoid naming conflict

Recently, when compiling bpf selftests on RV64, the following
compilation failure occurred:

progs/bpf_dctcp.c:29:21: error: redefinition of 'fallback' as different kind of symbol
29 | volatile const char fallback[TCP_CA_NAME_MAX];
| ^
/workspace/tools/testing/selftests/bpf/tools/include/vmlinux.h:86812:15: note: previous definition is here
86812 | typedef u32 (*fallback)(u32, const unsigned char *, size_t);

The reason is that the `fallback` symbol has been defined in
arch/riscv/lib/crc32.c, which will cause symbol conflicts when vmlinux.h
is included in bpf_dctcp. Let we rename `fallback` string to
`fallback_cc` in bpf_dctcp to fix this compilation failure.

Signed-off-by: Pu Lehui <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c

···
 	dctcp_skel = bpf_dctcp__open();
 	if (!ASSERT_OK_PTR(dctcp_skel, "dctcp_skel"))
 		return;
-	strcpy(dctcp_skel->rodata->fallback, "cubic");
+	strcpy(dctcp_skel->rodata->fallback_cc, "cubic");
 	if (!ASSERT_OK(bpf_dctcp__load(dctcp_skel), "bpf_dctcp__load"))
 		goto done;
 

tools/testing/selftests/bpf/progs/bpf_dctcp.c

···
 
 char _license[] SEC("license") = "GPL";
 
-volatile const char fallback[TCP_CA_NAME_MAX];
+volatile const char fallback_cc[TCP_CA_NAME_MAX];
 const char bpf_dctcp[] = "bpf_dctcp";
 const char tcp_cdg[] = "cdg";
 char cc_res[TCP_CA_NAME_MAX];
···
 	struct bpf_dctcp *ca = inet_csk_ca(sk);
 	int *stg;
 
-	if (!(tp->ecn_flags & TCP_ECN_OK) && fallback[0]) {
+	if (!(tp->ecn_flags & TCP_ECN_OK) && fallback_cc[0]) {
 		/* Switch to fallback */
 		if (bpf_setsockopt(sk, SOL_TCP, TCP_CONGESTION,
-				   (void *)fallback, sizeof(fallback)) == -EBUSY)
+				   (void *)fallback_cc, sizeof(fallback_cc)) == -EBUSY)
 			ebusy_cnt++;
 
 		/* Switch back to myself and the recurred bpf_dctcp_init()
···
 
 		/* Switch back to fallback */
 		if (bpf_setsockopt(sk, SOL_TCP, TCP_CONGESTION,
-				   (void *)fallback, sizeof(fallback)) == -EBUSY)
+				   (void *)fallback_cc, sizeof(fallback_cc)) == -EBUSY)
 			ebusy_cnt++;
 
 		/* Expecting -ENOTSUPP for tcp_cdg_res */