> On Nov 9, 2020, at 5:19 PM, Andrii Nakryiko <andrii@xxxxxxxxxx> wrote:
>
> Allocate ID for vmlinux BTF. This makes it visible when iterating over all BTF
> objects in the system. To allow distinguishing vmlinux BTF (and later kernel
> module BTF) from user-provided BTFs, expose extra kernel_btf flag, as well as
> BTF name ("vmlinux" for vmlinux BTF, will equal to module's name for module
> BTF). We might want to later allow specifying BTF name for user-provided BTFs
> as well, if that makes sense. But currently this is reserved only for
> in-kernel BTFs.
>
> Having in-kernel BTFs exposed IDs will allow to extend BPF APIs that require
> in-kernel BTF type with ability to specify BTF types from kernel modules, not
> just vmlinux BTF. This will be implemented in a follow up patch set for
> fentry/fexit/fmod_ret/lsm/etc.
>
> Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Acked-by: Song Liu <songliubraving@xxxxxx>
