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Date: Thu, 1 Feb 2024 15:53:39 +1100
From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Daniel Xu <dxu@dxuuu.xyz>
Cc: Daniel Borkmann <daniel@iogearbox.net>, Alexei Starovoitov
 <ast@kernel.org>, Andrii Nakryiko <andrii@kernel.org>, bpf
 <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>, Linux Kernel
 Mailing List <linux-kernel@vger.kernel.org>, Linux Next Mailing List
 <linux-next@vger.kernel.org>
Subject: Re: linux-next: runtime warnings after merge of the bpf-next tree
Message-ID: <20240201155339.2b5936be@canb.auug.org.au>
In-Reply-To: <yeujnwul3nd6vhk2pidnh72l5lx4zp4sgup4qzgbe2fpex42yf@2wtt67dvl7s3>
References: <20240201142348.38ac52d5@canb.auug.org.au>
	<yeujnwul3nd6vhk2pidnh72l5lx4zp4sgup4qzgbe2fpex42yf@2wtt67dvl7s3>
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Hi Daniel,

On Wed, 31 Jan 2024 20:55:43 -0700 Daniel Xu <dxu@dxuuu.xyz> wrote:
>
> Hi Stephen,
>=20
> Thanks for the report.
>=20
> On Thu, Feb 01, 2024 at 02:23:48PM +1100, Stephen Rothwell wrote:
> > Hi all,
> >=20
> > After merging the bpf-next tree, today's linux-next build (powerpc
> > pseries_le_defconfig) produced these runtime warnings in my qemu boot =
=20
>=20
> I can't quite find that config in-tree. Mind giving me a pointer?

Its a constructed config ("make pseries_le_config")

$ grep BPF .config
CONFIG_BPF=3Dy
CONFIG_HAVE_EBPF_JIT=3Dy
CONFIG_ARCH_WANT_DEFAULT_BPF_JIT=3Dy
# BPF subsystem
CONFIG_BPF_SYSCALL=3Dy
CONFIG_BPF_JIT=3Dy
# CONFIG_BPF_JIT_ALWAYS_ON is not set
CONFIG_BPF_JIT_DEFAULT_ON=3Dy
CONFIG_BPF_UNPRIV_DEFAULT_OFF=3Dy
# CONFIG_BPF_PRELOAD is not set
CONFIG_BPF_LSM=3Dy
# end of BPF subsystem
CONFIG_CGROUP_BPF=3Dy
CONFIG_NETFILTER_BPF_LINK=3Dy
CONFIG_NET_CLS_BPF=3Dm
CONFIG_NET_ACT_BPF=3Dm
# CONFIG_BPF_STREAM_PARSER is not set
# HID-BPF support
# end of HID-BPF support
CONFIG_BPF_EVENTS=3Dy
CONFIG_TEST_BPF=3Dm

> My guess is the config does not enable CONFIG_DEBUG_INFO_BTF which
> causes compilation to use the dummy definitions for BTF_KFUNCS_START().

Correct, see above.

--=20
Cheers,
Stephen Rothwell

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