linux-kernel - Re: [PATCH] riscv, libbpf: use a0 for RC register

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Date:   Thu, 7 Jul 2022 10:53:44 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Yixun Lan <dlan@...too.org>
Cc:     linux-riscv <linux-riscv@...ts.infradead.org>,
        bpf <bpf@...r.kernel.org>, Palmer Dabbelt <palmer@...belt.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Hengqi Chen <chenhengqi@...look.com>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv, libbpf: use a0 for RC register

On Wed, 6 Jul 2022 at 16:03, Yixun Lan <dlan@...too.org> wrote:
>
> According to the RISC-V calling convention register usage here[1],
> a0 is used as return value register, so rename it to make it consistent
> with the spec.
>
> [1] section 18.2, table 18.2
> https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf
>
> Fixes: 589fed479ba1 ("riscv, libbpf: Add RISC-V (RV64) support to bpf_tracing.h")
> Signed-off-by: Yixun Lan <dlan@...too.org>

Nice catch!

Acked-by: Björn Töpel <bjorn@...nel.org>