Hi, Andrii. It is much better to get an explicit compiler error than
to debug the BPF Verifier failure later. But should we let the other
selftests continue to compile?
I get the following compilation error, and the compilation is aborted:
$ make -C tools/testing/selftests/bpf/
CLNG-BPF [test_maps] cgrp_ls_attach_cgroup.bpf.o
progs/cb_refs.c:7:29: error: unknown attribute 'btf_type_tag' ignored [-Werror,-Wunknown-attributes]
struct prog_test_ref_kfunc __kptr_ref *ptr;
^~~~~~~~~~
/home/rongtao/Git/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:178:35: note: expanded from macro '__kptr_ref'
#define __kptr_ref __attribute__((btf_type_tag("kptr_ref")))
^~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [Makefile:541: /home/rongtao/Git/linux/tools/testing/selftests/bpf/cb_refs.bpf.o] Error 1
make: *** Waiting for unfinished jobs....
In file included from progs/cgrp_kfunc_failure.c:8:
progs/cgrp_kfunc_common.h:13:16: error: unknown attribute 'btf_type_tag' ignored [-Werror,-Wunknown-attributes]
struct cgroup __kptr_ref * cgrp;
^~~~~~~~~~
/home/rongtao/Git/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:178:35: note: expanded from macro '__kptr_ref'
#define __kptr_ref __attribute__((btf_type_tag("kptr_ref")))
^~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [Makefile:541: /home/rongtao/Git/linux/tools/testing/selftests/bpf/cgrp_kfunc_failure.bpf.o] Error 1
In file included from progs/cgrp_kfunc_success.c:8:
progs/cgrp_kfunc_common.h:13:16: error: unknown attribute 'btf_type_tag' ignored [-Werror,-Wunknown-attributes]
struct cgroup __kptr_ref * cgrp;
^~~~~~~~~~
/home/rongtao/Git/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:178:35: note: expanded from macro '__kptr_ref'
#define __kptr_ref __attribute__((btf_type_tag("kptr_ref")))
^~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [Makefile:541: /home/rongtao/Git/linux/tools/testing/selftests/bpf/cgrp_kfunc_success.bpf.o] Error 1
make: Leaving directory '/home/rongtao/Git/linux/tools/testing/selftests/bpf'
Best wishes.
Rong Tao
