linux-kernel - RE: [PATCH bpf-next v2 2/2] riscv, bpf: Support riscv jit to provide bpf_line

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Message-ID: <62758c1abea39_196b72087a@john.notmuch>
Date:   Fri, 06 May 2022 13:59:06 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Pu Lehui <pulehui@...wei.com>, bpf@...r.kernel.org,
        linux-riscv@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Pu Lehui <pulehui@...wei.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>, 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>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: RE: [PATCH bpf-next v2 2/2] riscv, bpf: Support riscv jit to provide
 bpf_line_info

Pu Lehui wrote:
> Add support for riscv jit to provide bpf_line_info.
> We need to consider the prologue offset in ctx->offset,
> but unlike x86 and arm64, ctx->offset of riscv does not
> provide an extra slot for the prologue, so here we just
> calculate the len of prologue and add it to ctx->offset
> at the end. Both RV64 and RV32 have been tested.
> 
> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---

Looks reasonable to me, but would be good if someone with RISC
knowledge takes a lookt hough.