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

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Message-ID: <CAM1=_QSDhFQ6EBOi5F3cM9xEoxNFpX_4uCM71cUiOaurRpH0iw@mail.gmail.com>
Date:   Thu, 29 Jul 2021 15:29:52 +0200
From:   Johan Almbladh <johan.almbladh@...finetworks.com>
To:     Yonghong Song <yhs@...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 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.