linux-kernel - Re: [PATCH bpf-next v3 4/9] bpf: Introduce load-acquire and store-release instructions

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Message-ID: <Z8AcosbkJ_n8wEbZ@google.com>
Date: Thu, 27 Feb 2025 08:04:50 +0000
From: Peilin Ye <yepeilin@...gle.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: bpf <bpf@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	bpf@...f.org, Xu Kuohai <xukuohai@...weicloud.com>,
	Eduard Zingerman <eddyz87@...il.com>,
	David Vernet <void@...ifault.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Puranjay Mohan <puranjay@...nel.org>,
	Ilya Leoshkevich <iii@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Quentin Monnet <qmo@...nel.org>,
	Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
	Ihor Solodrai <ihor.solodrai@...ux.dev>,
	Yingchi Long <longyingchi24s@....ac.cn>,
	Josh Don <joshdon@...gle.com>, Barret Rhoden <brho@...gle.com>,
	Neel Natu <neelnatu@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 4/9] bpf: Introduce load-acquire and
 store-release instructions

On Wed, Feb 26, 2025 at 06:18:47PM -0800, Alexei Starovoitov wrote:
> It's border line ok-ish to delay arena ld_acq/st_rel on x86 for a follow up,
> but non-arena on x86 should be done in this patch.
> It's trivial to add support on x86-64 and
> limiting the selftest to:
> .. defined(__TARGET_ARCH_arm64)
> is just not right.
> 
> Even arena ld_acq/st_rel can be done in this patch too.
> It is such a minor addition compared to the rest, so I don't see
> a reason not to do it right away.

Sure!  I'll add x86-64 support (including arena) in v4.

Thanks,
Peilin Ye