linux-kernel - Re: [RFC/RFT PATCH 2/6] arc: Wire up cmpxchg64

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Message-ID: <20251127150614.GA3271003@e124191.cambridge.arm.com>
Date: Thu, 27 Nov 2025 15:06:14 +0000
From: Joey Gouly <joey.gouly@....com>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-hardening@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Kees Cook <kees@...nel.org>, Ryan Roberts <ryan.roberts@....com>,
	Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Jeremy Linton <jeremy.linton@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	"Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [RFC/RFT PATCH 2/6] arc: Wire up cmpxchg64_local() to generic
 implementation

On Thu, Nov 27, 2025 at 10:22:29AM +0100, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@...nel.org>
> 
> Provide cmpxchg64_local() for hexagon so we can start using it in
> generic code.

nit: this is for arc, not hexagon.

Thanks,
Joey

> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  arch/arc/include/asm/cmpxchg.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
> index 76f43db0890f..f2d55823645c 100644
> --- a/arch/arc/include/asm/cmpxchg.h
> +++ b/arch/arc/include/asm/cmpxchg.h
> @@ -12,6 +12,7 @@
>  
>  #include <asm/barrier.h>
>  #include <asm/smp.h>
> +#include <asm-generic/cmpxchg-local.h>
>  
>  #ifdef CONFIG_ARC_HAS_LLSC
>  
> @@ -142,4 +143,6 @@
>  
>  #endif
>  
> +#define arch_cmpxchg64_local __generic_cmpxchg64_local
> +
>  #endif
> -- 
> 2.52.0.107.ga0afd4fd5b-goog
> 
>