On Thu, Jul 14, 2022 at 3:33 PM Indu Bhagat <indu.bhagat@xxxxxxxxxx> wrote: > > The vlen bits in the BTF type of kind BTF_KIND_FUNC are used to convey the > linkage information for functions. The Linux kernel only supports > linkage values of BTF_FUNC_STATIC and BTF_FUNC_GLOBAL at this time. > > Signed-off-by: Indu Bhagat <indu.bhagat@xxxxxxxxxx> > --- LGTM. Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > Documentation/bpf/btf.rst | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst > index f49aeef62d0c..cf8722f96090 100644 > --- a/Documentation/bpf/btf.rst > +++ b/Documentation/bpf/btf.rst > @@ -369,7 +369,8 @@ No additional type data follow ``btf_type``. > * ``name_off``: offset to a valid C identifier > * ``info.kind_flag``: 0 > * ``info.kind``: BTF_KIND_FUNC > - * ``info.vlen``: 0 > + * ``info.vlen``: linkage information (BTF_FUNC_STATIC, BTF_FUNC_GLOBAL > + or BTF_FUNC_EXTERN) > * ``type``: a BTF_KIND_FUNC_PROTO type > > No additional type data follow ``btf_type``. > @@ -380,6 +381,9 @@ type. The BTF_KIND_FUNC may in turn be referenced by a func_info in the > :ref:`BTF_Ext_Section` (ELF) or in the arguments to :ref:`BPF_Prog_Load` > (ABI). > > +Currently, only linkage values of BTF_FUNC_STATIC and BTF_FUNC_GLOBAL are > +supported in the kernel. > + > 2.2.13 BTF_KIND_FUNC_PROTO > ~~~~~~~~~~~~~~~~~~~~~~~~~~ > > -- > 2.31.1 >
