netdev - Re: [PATCH net-next 2/3] bpf: change helper bpf_probe_read arg2 type to ARG_CONST_SIZE_OR

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Message-ID: <b286cf77-df95-30f1-7e3c-a478c2107bbc@cogentembedded.com>
Date:   Sun, 12 Nov 2017 14:20:06 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Yonghong Song <yhs@...com>, ast@...com, daniel@...earbox.net,
        netdev@...r.kernel.org
Cc:     kernel-team@...com
Subject: Re: [PATCH net-next 2/3] bpf: change helper bpf_probe_read arg2 type
 to ARG_CONST_SIZE_OR_ZERO

Hello!

On 11/12/2017 3:00 AM, Yonghong Song wrote:

> The helper bpf_probe_read arg2 type is changed
> from ARG_CONST_SIZE to ARG_CONST_SIZE_OR_ZERO to permit
> size-0 buffer. Together with newer ARG_CONST_SIZE_OR_ZERO
> semantics which allows non-NULL buffer with size 0,
> this allows simpler bpf programs with verifier acceptance.
> The prvious commit which changes ARG_CONST_SIZE_OR_ZERO semantics

    Previous.

> has details on examples.
> 
> Signed-off-by: Yonghong Song <yhs@...com>
> Acked-by: Alexei Starovoitov <ast@...nel.org>
[...]

MBR, Sergei