linux-kernel - Re: [External] Re: [PATCH v2 0/4] riscv: Add Zalasr ISA extension support

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Message-ID: <aM0KBwkdPFD69oui@andrea>
Date: Fri, 19 Sep 2025 09:45:11 +0200
From: Andrea Parri <parri.andrea@...il.com>
To: Xu Lu <luxu.kernel@...edance.com>
Cc: Guo Ren <guoren@...nel.org>, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
	aou@...s.berkeley.edu, alex@...ti.fr, ajones@...tanamicro.com,
	brs@...osinc.com, devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	apw@...onical.com, joe@...ches.com
Subject: Re: [External] Re: [PATCH v2 0/4] riscv: Add Zalasr ISA extension
 support

> The existing implementation of spin_unlock, when followed by
> spin_lock, is equal to 'FENCE rw, rw' for operations before

This is not true without Zacas, that is, when using LR/SC: write-to-read
remains unordered in that case.

  Andrea