linux-kernel - Re: [PATCH bpf-next v3 07/14] bpf: Add BPF_FETCH field / create atomic_fetch

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Message-ID: <9e19c8e7-7d46-0dbe-619a-1b6547fc7f73@fb.com>
Date:   Thu, 3 Dec 2020 21:02:49 -0800
From:   Yonghong Song <yhs@...com>
To:     Brendan Jackman <jackmanb@...gle.com>, <bpf@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        KP Singh <kpsingh@...omium.org>,
        Florent Revest <revest@...omium.org>,
        <linux-kernel@...r.kernel.org>, Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH bpf-next v3 07/14] bpf: Add BPF_FETCH field / create
 atomic_fetch_add instruction



On 12/3/20 8:02 AM, Brendan Jackman wrote:
> This value can be set in bpf_insn.imm, for BPF_ATOMIC instructions,

it is not clear what "this value" means here.
Maybe more specific using "The BPF_FETCH field"?

> in order to have the previous value of the atomically-modified memory
> location loaded into the src register after an atomic op is carried
> out.
> 
> Suggested-by: Yonghong Song <yhs@...com>
> Signed-off-by: Brendan Jackman <jackmanb@...gle.com>

Ack with the above nit.

Acked-by: Yonghong Song <yhs@...com>