On Fri, Jan 28, 2022 at 6:31 AM Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: > > On Mon, Dec 20, 2021 at 10:34 PM Yonghong Song <yhs@xxxxxx> wrote: > > > > > > https://reviews.llvm.org/D116063 improved the error message as below > > to make it a little bit more evident what is the problem: > > > > $ clang -target bpf -O2 -g -c bug.c > > > > fatal error: error in backend: SubroutineType not supported for > > BTF_TYPE_ID_REMOTE reloc > > Hi Matteo, > > Are you still working on a test? > What's a timeline to repost the patch set? > > Thanks! Hi Alexei, The change itself is ready, I'm just stuck at writing a test which will effectively calls __bpf_core_types_are_compat() with some recursion. I guess that I have to generate a BTF_KIND_FUNC_PROTO type somehow, so __bpf_core_types_are_compat() is called again to check the prototipe arguments type. I tried with these two, with no luck: // 1 typedef int (*func_proto_typedef)(struct sk_buff *); bpf_core_type_exists(func_proto_typedef); // 2 void func_proto(int, unsigned int); bpf_core_type_id_kernel(func_proto); Which is a simple way to generate a BTF_KIND_FUNC_PROTO BTF field? Regards, -- per aspera ad upstream
