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From:   Song Liu <songliubraving@fb.com>
To:     Andrii Nakryiko <andrii@kernel.org>
CC:     bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>,
        "Alexei Starovoitov" <ast@fb.com>,
        "daniel@iogearbox.net" <daniel@iogearbox.net>,
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        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v4 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return
 extra info for BTF in GET_OBJ_INFO
Thread-Topic: [PATCH v4 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return
 extra info for BTF in GET_OBJ_INFO
Thread-Index: AQHWtwAGZmszHy7p70yAdAMsxZarMKnB0P2A
Date:   Tue, 10 Nov 2020 20:24:32 +0000
Message-ID: <AD242C68-00CA-4775-896F-257A11872164@fb.com>
References: <20201110011932.3201430-1-andrii@kernel.org>
 <20201110011932.3201430-3-andrii@kernel.org>
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> On Nov 9, 2020, at 5:19 PM, Andrii Nakryiko <andrii@kernel.org> wrote:
>=20
> Allocate ID for vmlinux BTF. This makes it visible when iterating over al=
l BTF
> objects in the system. To allow distinguishing vmlinux BTF (and later ker=
nel
> module BTF) from user-provided BTFs, expose extra kernel_btf flag, as wel=
l as
> BTF name ("vmlinux" for vmlinux BTF, will equal to module's name for modu=
le
> 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.
>=20
> Having in-kernel BTFs exposed IDs will allow to extend BPF APIs that requ=
ire
> 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.
>=20
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

Acked-by: Song Liu <songliubraving@fb.com>