On Tue, Jul 23, 2024 at 09:43:12PM -0700, Kui-Feng Lee wrote: > > > On 7/23/24 20:19, Ming Lei wrote: > > Export btf_find_by_name_kind and bpf_base_func_proto, so that kernel > > module can use them. > > > > Almost all existed struct_ops users(hid, sched_ext, ...) need the two APIs. > > > > Without this change, hid-bpf can't be built as module. > > Could you give me more context? > Give me a link of an example code or something? > Or explain the use case? The merged patchset "Registrating struct_ops types from modules" is trying to allow module to register struct_ops, which often needs bpf_base_func_proto()(for allowing generic helpers available in prog) and btf_find_by_name_kind() (for implementing .btf_struct_access). One example is hid-bpf, which is a driver and supposed to build as module, but it can't be done because the two APIs aren't exported. I am working on ublk bpf support, which needs bpf_base_func_proto() at least, and might require btf_find_by_name_kind() in future. Thanks, Ming
