netdev - Re: [PATCH bpf-next 0/2] Enable inline bpf_kptr

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Message-ID: <87jznqoh3u.fsf@all.your.base.are.belong.to.us>
Date: Tue, 30 Jan 2024 18:39:49 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Pu Lehui <pulehui@...weicloud.com>, bpf@...r.kernel.org,
 linux-riscv@...ts.infradead.org, netdev@...r.kernel.org
Cc: Hou Tao <houtao1@...wei.com>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko
 <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Eduard
 Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, Yonghong Song
 <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh
 <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo
 <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, Palmer Dabbelt
 <palmer@...belt.com>, Luke Nelson <luke.r.nels@...il.com>, Pu Lehui
 <pulehui@...wei.com>, Pu Lehui <pulehui@...weicloud.com>
Subject: Re: [PATCH bpf-next 0/2] Enable inline bpf_kptr_xchg() for RV64

Pu Lehui <pulehui@...weicloud.com> writes:

> This patch is the RV64 implementation of inline bpf_kptr_xchg()[0]. RV64
> JIT supports 64-bit BPF_XCHG atomic instructions. At the same time, the
> underlying implementation of xchg() and atomic64_xchg() in RV64 both are
> raw_xchg() that supported 64-bit. Therefore inline bpf_kptr_xchg() will
> have equivalent semantics. Let's inline it for better performance.
>
> link: https://lore.kernel.org/bpf/20240105104819.3916743-1-houtao@huaweicloud.com [0]

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