netdev - Re: [PATCH 11/14] bpf/tests: Add test for 32-bit context pointer argument passing

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Message-ID: <79d4e1d1-7dd1-f234-54e3-6edbf799474b@fb.com>
Date:   Thu, 29 Jul 2021 08:50:44 -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 11/14] bpf/tests: Add test for 32-bit context pointer
 argument passing



On 7/29/21 6:29 AM, Johan Almbladh wrote:
> On Thu, Jul 29, 2021 at 2:09 AM Yonghong Song <yhs@...com> wrote:
>> On 7/28/21 10:04 AM, Johan Almbladh wrote:
>>> On a 32-bit architecture, the context pointer should occupy the low
>>> half of R0, and the other half should be zero.
>>
>> I think this is probably true. The word choice "should" indicates
>> this doesn't need to be the case if people choose a different
>> implementation, right?
>>
> 
> Right. To the best of my knowledge this is true. I can change the
> wording to "will" to remove the ambiguity.

Sounds good. thanks!