linux-kernel - Re: [PATCH 4/7] riscv: Implement xchg8/16() using Zabha

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Date: Wed, 29 May 2024 08:15:40 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Conor Dooley <conor@...nel.org>
Cc: Jonathan Corbet <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	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, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 4/7] riscv: Implement xchg8/16() using Zabha

Hi Conor,

On Tue, May 28, 2024 at 5:22 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Tue, May 28, 2024 at 05:10:49PM +0200, Alexandre Ghiti wrote:
>         \
> > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> > index e17d0078a651..f71ddd2ca163 100644
> > --- a/arch/riscv/include/asm/hwcap.h
> > +++ b/arch/riscv/include/asm/hwcap.h
> > @@ -81,6 +81,7 @@
> >  #define RISCV_ISA_EXT_ZTSO           72
> >  #define RISCV_ISA_EXT_ZACAS          73
> >  #define RISCV_ISA_EXT_XANDESPMU              74
> > +#define RISCV_ISA_EXT_ZABHA          75
> >
> >  #define RISCV_ISA_EXT_XLINUXENVCFG   127
> >
> > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > index 3ed2359eae35..8d0f56dd2f53 100644
> > --- a/arch/riscv/kernel/cpufeature.c
> > +++ b/arch/riscv/kernel/cpufeature.c
> > @@ -257,6 +257,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
> >       __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
> >       __RISCV_ISA_EXT_DATA(zihpm, RISCV_ISA_EXT_ZIHPM),
> >       __RISCV_ISA_EXT_DATA(zacas, RISCV_ISA_EXT_ZACAS),
> > +     __RISCV_ISA_EXT_DATA(zabha, RISCV_ISA_EXT_ZABHA),
> >       __RISCV_ISA_EXT_DATA(zfa, RISCV_ISA_EXT_ZFA),
> >       __RISCV_ISA_EXT_DATA(zfh, RISCV_ISA_EXT_ZFH),
> >       __RISCV_ISA_EXT_DATA(zfhmin, RISCV_ISA_EXT_ZFHMIN),
>
> You're missing a dt-binding patch in this series adding zabha.

Thanks, I will add that to the v2.

>
> Thanks,
> Conor.