netdev - Re: [PATCH 10/14] bpf/tests: Add branch conversion JIT test

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Date:   Thu, 29 Jul 2021 08:46:56 -0700
From:   Yonghong Song <yhs@...com>
To:     Johan Almbladh <johan.almbladh@...finetworks.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Tony Ambardar <Tony.Ambardar@...il.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH 10/14] bpf/tests: Add branch conversion JIT test



On 7/29/21 5:45 AM, Johan Almbladh wrote:
> On Thu, Jul 29, 2021 at 1:59 AM Yonghong Song <yhs@...com> wrote:
>>> +static int bpf_fill_long_jmp(struct bpf_test *self)
>>> +{
>>> +     unsigned int len = BPF_MAXINSNS;
>>> +     struct bpf_insn *insn;
>>> +     int i;
>>> +
>>> +     insn = kmalloc_array(len, sizeof(*insn), GFP_KERNEL);
>>> +     if (!insn)
>>> +             return -ENOMEM;
>>
>> When insn will be freed?
> 
> It is freed by the existing test runner code. If the fill_helper
> member is set, the function destroy_bpf_tests frees the insn pointer
> in that test case. This is the same as with other tests that use the
> fill_helper facility.

Sounds good. Thanks for explanation.