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From: Hao Luo <haoluo@google.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Network Development <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
	"open list:KERNEL SELFTEST FRAMEWORK" 
	<linux-kselftest@vger.kernel.org>, Shuah Khan <shuah@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andriin@fb.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@chromium.org>,
	Quentin Monnet <quentin@isovalent.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH bpf-next v4 0/6] bpf: BTF support for ksyms
Date: Tue, 29 Sep 2020 23:48:14 -0700	[thread overview]
Message-ID: <CA+khW7i4wpvOsJTH4AePVsm4cAOnFoxEwEqv27tEzJrwOWFqxw@mail.gmail.com> (raw)
In-Reply-To: <CAADnVQK8XbzDs9hWLYEqkJj+g=1HJ7nrar+0STY5CY8t5nrC=A@mail.gmail.com>

Ah, this is the bug in pahole described in
https://lkml.org/lkml/2020/8/20/1862. I proposed a fix [1] but it
hasn't reached pahole's master branch. Let me ask Arnaldo to see if he
is OK merging it.

[1] https://www.spinics.net/lists/dwarves/msg00451.html

On Tue, Sep 29, 2020 at 9:36 PM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Tue, Sep 29, 2020 at 4:50 PM Hao Luo <haoluo@google.com> wrote:
> >
> > v3 -> v4:
> >  - Rebasing
> >  - Cast bpf_[per|this]_cpu_ptr's parameter to void __percpu * before
> >    passing into per_cpu_ptr.
>
> Looks good, but doesn't work:
> ./test_progs -t ksyms_btf
> test_ksyms_btf:PASS:kallsyms_fopen 0 nsec
> test_ksyms_btf:PASS:ksym_find 0 nsec
> test_ksyms_btf:PASS:kallsyms_fopen 0 nsec
> test_ksyms_btf:PASS:ksym_find 0 nsec
> test_ksyms_btf:PASS:btf_exists 0 nsec
> libbpf: extern (ksym) 'bpf_prog_active': incompatible types, expected
> [4] int int, but kernel has [18729] var bpf_user_rnd_state
> libbpf: failed to load object 'test_ksyms_btf'
> libbpf: failed to load BPF skeleton 'test_ksyms_btf': -22
> test_ksyms_btf:FAIL:skel_open failed to open and load skeleton
> #43 ksyms_btf:FAIL
>
> I have the latest pahole from master. Any ideas?

  reply	other threads:[~2020-09-30  6:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-29 23:50 [PATCH bpf-next v4 0/6] bpf: BTF support for ksyms Hao Luo
2020-09-29 23:50 ` [PATCH bpf-next v4 1/6] bpf: Introduce pseudo_btf_id Hao Luo
2020-10-06 19:05   ` Alexei Starovoitov
2020-10-06 20:17     ` Hao Luo
2020-09-29 23:50 ` [PATCH bpf-next v4 2/6] bpf/libbpf: BTF support for typed ksyms Hao Luo
2020-09-29 23:50 ` [PATCH bpf-next v4 3/6] selftests/bpf: ksyms_btf to test " Hao Luo
2020-09-29 23:50 ` [PATCH bpf-next v4 4/6] bpf: Introduce bpf_per_cpu_ptr() Hao Luo
2020-09-29 23:50 ` [PATCH bpf-next v4 5/6] bpf: Introducte bpf_this_cpu_ptr() Hao Luo
2020-09-29 23:50 ` [PATCH bpf-next v4 6/6] bpf/selftests: Test for bpf_per_cpu_ptr() and bpf_this_cpu_ptr() Hao Luo
2020-09-30  4:35 ` [PATCH bpf-next v4 0/6] bpf: BTF support for ksyms Alexei Starovoitov
2020-09-30  6:48   ` Hao Luo [this message]
2020-10-02 22:16     ` Alexei Starovoitov
2020-10-02 22:34       ` Hao Luo

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