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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	john fastabend <john.fastabend@gmail.com>,
	Lorenz Bauer <lmb@cloudflare.com>,
	mcroce@microsoft.com, bpf <bpf@vger.kernel.org>,
	Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH RFC bpf-next 04/10] bpf: Add bpf_core_add_cands() and wire it into bpf_core_apply_relo_insn().
Date: Tue, 21 Sep 2021 14:34:35 -0700	[thread overview]
Message-ID: <CAEf4BzYmayUDDkSoab-_A8c9Oo1OLX7KdqNQkfZz2Xsw_qLOEw@mail.gmail.com> (raw)
In-Reply-To: <20210917215721.43491-5-alexei.starovoitov@gmail.com>

On Fri, Sep 17, 2021 at 2:57 PM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> From: Alexei Starovoitov <ast@kernel.org>
>
> Given BPF program's BTF perform a linear search through kernel BTFs for
> a possible candidate.
> Then wire the result into bpf_core_apply_relo_insn().
>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
> ---
>  kernel/bpf/btf.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 147 insertions(+), 2 deletions(-)
>

[...]

> +       /* If candidate is not found in vmlinux's BTF then search in module's BTFs */
> +       spin_lock_bh(&btf_idr_lock);
> +       idr_for_each_entry(&btf_idr, mod_btf, id) {
> +               if (!btf_is_module(mod_btf))
> +                       continue;
> +               /* linear search could be slow hence unlock/lock
> +                * the IDR to avoiding holding it for too long
> +                */
> +               btf_get(mod_btf);
> +               spin_unlock_bh(&btf_idr_lock);
> +               err = bpf_core_add_cands(&local_cand, local_essent_len,
> +                                        mod_btf,
> +                                        btf_nr_types(main_btf),
> +                                        cands);
> +               if (err)
> +                       btf_put(mod_btf);
> +               goto err_out;

this couldn't have worked properly for modules, missing {} ?

> +               spin_lock_bh(&btf_idr_lock);
> +               btf_put(mod_btf);
> +       }
> +       spin_unlock_bh(&btf_idr_lock);
> +
> +       return cands;
> +err_out:
> +       bpf_core_free_cands(cands);
> +       return ERR_PTR(err);
> +}
> +

[...]

  reply	other threads:[~2021-09-21 21:34 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 21:57 [PATCH RFC bpf-next 00/10] bpf: CO-RE support in the kernel Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 01/10] bpf: Prepare relo_core.c for kernel duty Alexei Starovoitov
2021-09-21 21:25   ` Andrii Nakryiko
2021-09-28 14:45   ` Matteo Croce
2021-09-28 16:37     ` Alexei Starovoitov
2021-09-28 17:11       ` Matteo Croce
2021-09-28 20:34         ` Alexei Starovoitov
2021-09-29 12:32           ` Matteo Croce
2021-09-29 17:38             ` Matteo Croce
2021-09-29 23:00               ` Alexei Starovoitov
2021-09-29 23:49                 ` Matteo Croce
2021-10-22  0:48                   ` Matteo Croce
2021-10-22  0:51                     ` Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 02/10] bpf: Define enum bpf_core_relo_kind as uapi Alexei Starovoitov
2021-09-21 21:27   ` Andrii Nakryiko
2021-09-17 21:57 ` [PATCH RFC bpf-next 03/10] bpf: Add proto of bpf_core_apply_relo() Alexei Starovoitov
2021-09-23 11:21   ` Lorenz Bauer
2021-09-23 18:48     ` Andrii Nakryiko
2021-09-17 21:57 ` [PATCH RFC bpf-next 04/10] bpf: Add bpf_core_add_cands() and wire it into bpf_core_apply_relo_insn() Alexei Starovoitov
2021-09-21 21:34   ` Andrii Nakryiko [this message]
2021-09-27 18:04   ` Matteo Croce
2021-09-17 21:57 ` [PATCH RFC bpf-next 05/10] libbpf: Use CO-RE in the kernel in light skeleton Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 06/10] libbpf: Make gen_loader data aligned Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 07/10] libbpf: Support init of inner maps in light skeleton Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 08/10] selftests/bpf: Convert kfunc test with CO-RE to lskel Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 09/10] selftests/bpf: Improve inner_map test coverage Alexei Starovoitov
2021-09-17 21:57 ` [PATCH RFC bpf-next 10/10] selftests/bpf: Convert map_ptr_kern test to use light skeleton Alexei Starovoitov
2021-09-23 11:33 ` [PATCH RFC bpf-next 00/10] bpf: CO-RE support in the kernel Lorenz Bauer
2021-09-23 18:52   ` Andrii Nakryiko
2021-09-24 23:13   ` Alexei Starovoitov
2021-09-27 16:12     ` Lorenz Bauer
2021-09-27 16:50       ` Alexei Starovoitov
2021-09-28  8:30         ` Lorenz Bauer
2021-09-28 16:35           ` Alexei Starovoitov

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