linux-kernel - Re: Re: [PATCH 1/2] bpf: support access variable length array of integer type

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Message-ID: <0460e6ac-40f9-6e47-e121-87c824658482@bytedance.com>
Date:   Tue, 18 Apr 2023 10:53:59 +0800
From:   Feng Zhou <zhoufeng.zf@...edance.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     martin.lau@...ux.dev, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        mykolal@...com, shuah@...nel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org, yangzhenze@...edance.com,
        wangdongdong.6@...edance.com, zhouchengming@...edance.com
Subject: Re: Re: [PATCH 1/2] bpf: support access variable length array of
 integer type

在 2023/4/18 08:08, Alexei Starovoitov 写道:
> On Mon, Apr 17, 2023 at 04:07:48PM +0800, Feng zhou wrote:
>> From: Feng Zhou <zhoufeng.zf@...edance.com>
>>
>> After this commit:
>> bpf: Support variable length array in tracing programs (9c5f8a1008a1)
>> Trace programs can access variable length array, but for structure
>> type. This patch adds support for integer type.
>>
>> Example:
>> Hook load_balance
>> struct sched_domain {
>> 	...
>> 	unsigned long span[];
>> }
>>
>> The access: sd->span[0].
> The use case makes sense.
> Please add it as a selftest. Either combine it with patch 2 or another patch 3.
> and then resubmit.
> Make sure to use [PATCH bpf-next] subject, so BPF CI knows how to test it.

Will do, thanks.