vmtests: fix 4.9 build

Drop blacklist and instead use a small whitelist of tests that are still
supposed to work on old 4.9 kernel.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>

travis-ci/vmtest/configs/blacklist/BLACKLIST-4.9.0

@@ -1,56 +0,0 @@
-# PERMANENTLY DISABLED
-align			# verifier output format changed
-bpf_iter		# bpf_iter support is missing
-bpf_obj_id		# bpf_link support missing for GET_OBJ_INFO, GET_FD_BY_ID, etc
-bpf_tcp_ca		# STRUCT_OPS is missing
-
-# latest Clang generates code that fails to verify
-bpf_verif_scale
-#bpf_verif_scale/strobemeta.o
-#bpf_verif_scale/strobemeta_nounroll1.o
-#bpf_verif_scale/strobemeta_nounroll2.o
-
-cgroup_attach_multi	# BPF_F_REPLACE_PROG missing
-cgroup_link		# LINK_CREATE is missing
-cgroup_skb_sk_lookup	# bpf_sk_lookup_tcp() helper is missing
-connect_force_port	# cgroup/get{peer,sock}name{4,6} support is missing
-enable_stats		# BPF_ENABLE_STATS support is missing
-fentry_fexit		# bpf_prog_test_tracing missing
-fentry_test		# bpf_prog_test_tracing missing
-fexit_bpf2bpf		# freplace is missing
-fexit_test		# bpf_prog_test_tracing missing
-flow_dissector		# bpf_link-based flow dissector is in 5.8+
-flow_dissector_reattach
-get_stack_raw_tp	# exercising BPF verifier bug causing infinite loop
-ksyms			# __start_BTF has different name
-link_pinning		# bpf_link is missing
-load_bytes_relative	# new functionality in 5.8
-map_ptr			# test uses BPF_MAP_TYPE_RINGBUF, added in 5.8
-mmap			# 5.5 kernel is too permissive with re-mmaping
-modify_return		# fmod_ret support is missing
-ns_current_pid_tgid	# bpf_get_ns_current_pid_tgid() helper is missing
-perf_branches		# bpf_read_branch_records() helper is missing
-ringbuf			# BPF_MAP_TYPE_RINGBUF is supported in 5.8+
-
-# bug in verifier w/ tracking references
-#reference_tracking/classifier/sk_lookup_success
-reference_tracking
-
-select_reuseport	# UDP support is missing
-sk_assign		# bpf_sk_assign helper missing
-skb_helpers		# helpers added in 5.8+
-sockmap_listen		# no listen socket supportin SOCKMAP
-skb_ctx			# ctx_{size, }_{in, out} in BPF_PROG_TEST_RUN is missing
-test_global_funcs	# kernel doesn't support BTF linkage=global on FUNCs
-test_lsm		# no BPF_LSM support
-test_overhead		# no fmod_ret support
-varlen			# verifier bug fixed in later kernels
-vmlinux			# hrtimer_nanosleep() signature changed incompatibly
-xdp_adjust_tail		# new XDP functionality added in 5.8
-xdp_attach		# IFLA_XDP_EXPECTED_FD support is missing
-xdp_bpf2bpf		# freplace is missing
-
-
-# TEMPORARILY DISABLED
-send_signal		# flaky
-cls_redirect		# latest Clang breaks BPF verification

travis-ci/vmtest/configs/whitelist/WHITELIST-4.9.0

@@ -0,0 +1,5 @@
+btf_dump
+cpu_mask
+hashmap
+perf_buffer
+section_names