linux-kernel - Re: [PATCH 1/2] bpf, riscv: fix bugs in JIT for 32-bit ALU operations

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Date:   Thu, 30 May 2019 15:34:10 -0700
From:   Luke Nelson <luke.r.nels@...il.com>
To:     Song Liu <liu.song.a23@...il.com>
Cc:     Xi Wang <xi.wang@...il.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Networking <netdev@...r.kernel.org>,
        linux-riscv@...ts.infradead.org, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] bpf, riscv: fix bugs in JIT for 32-bit ALU operations

On Thu, May 30, 2019 at 1:53 PM Song Liu <liu.song.a23@...il.com> wrote:
>
> This is a little messy. How about we introduce some helper function
> like:
>
> /* please find a better name... */
> emit_32_or_64(bool is64, const u32 insn_32, const u32 inst_64, struct
> rv_jit_context *ctx)
> {
>        if (is64)
>             emit(insn_64, ctx);
>        else {
>             emit(insn_32, ctx);
>            rd = xxxx;
>            emit_zext_32(rd, ctx);
>        }
> }

This same check is used throughout the file, maybe clean it up in a
separate patch?