linux-kernel - Re: [PATCH v4 05/13] riscv: Implement cmpxchg8/16() using Zabha

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Message-ID: <20240731-da4a7d7790e88a6b8960ad3e@orel>
Date: Wed, 31 Jul 2024 11:27:04 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Alexandre Ghiti <alexghiti@...osinc.com>
Cc: Jonathan Corbet <corbet@....net>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Andrea Parri <parri.andrea@...il.com>, 
	Nathan Chancellor <nathan@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Boqun Feng <boqun.feng@...il.com>, Arnd Bergmann <arnd@...db.de>, 
	Leonardo Bras <leobras@...hat.com>, Guo Ren <guoren@...nel.org>, linux-doc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v4 05/13] riscv: Implement cmpxchg8/16() using Zabha

On Wed, Jul 31, 2024 at 09:23:57AM GMT, Alexandre Ghiti wrote:
> This adds runtime support for Zabha in cmpxchg8/16() operations.
> 
> Note that in the absence of Zacas support in the toolchain, CAS
> instructions from Zabha won't be used.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/Kconfig               | 18 ++++++++
>  arch/riscv/Makefile              |  3 ++
>  arch/riscv/include/asm/cmpxchg.h | 78 ++++++++++++++++++++------------
>  arch/riscv/include/asm/hwcap.h   |  1 +
>  arch/riscv/kernel/cpufeature.c   |  1 +
>  5 files changed, 72 insertions(+), 29 deletions(-)
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>