Re: [PATCH bpf-next 07/10] riscv, bpf: Optimize cmpxchg insn with Zacas support

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Subject: Re: [PATCH bpf-next 07/10] riscv, bpf: Optimize cmpxchg insn with Zacas support
From: Björn Töpel <bjorn@xxxxxxxxxx>
Date: Mon, 04 Aug 2025 22:41:00 +0200
Cc: Puranjay Mohan <puranjay@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Alexandre Ghiti <alex@xxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Martin KaFai Lau <martin.lau@xxxxxxxxx>, Eduard Zingerman <eddyz87@xxxxxxxxx>, Song Liu <song@xxxxxxxxxx>, Yonghong Song <yonghong.song@xxxxxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, KP Singh <kpsingh@xxxxxxxxxx>, Stanislav Fomichev <sdf@xxxxxxxxxxx>, Hao Luo <haoluo@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Pu Lehui <pulehui@xxxxxxxxxx>
In-reply-to: <20250719091730.2660197-8-pulehui@huaweicloud.com>

Pu Lehui <pulehui@xxxxxxxxxxxxxxx> writes:

> From: Pu Lehui <pulehui@xxxxxxxxxx>
>
> Optimize cmpxchg instruction with amocas.w and amocas.d
> Zacas instructions.
>
> Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>

Reviewed-by: Björn Töpel <bjorn@xxxxxxxxxxxx>

References:
- [PATCH bpf-next 00/10] Add support arena atomics for RV64
  - From: Pu Lehui
- [PATCH bpf-next 07/10] riscv, bpf: Optimize cmpxchg insn with Zacas support
  - From: Pu Lehui

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