linux-kernel - Re: [PATCH v8 loongarch-next 3/3] LoongArch: Enable 128-bit atomics cmpxchg support

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Message-ID: <CAEyhmHThJUgJED4FcAB6waVadTNJzSx4bFfsUw-4TZEeRjcF3w@mail.gmail.com>
Date: Wed, 31 Dec 2025 17:52:21 +0800
From: Hengqi Chen <hengqi.chen@...il.com>
To: George Guo <dongtai.guo@...ux.dev>
Cc: chenhuacai@...nel.org, guodongtai@...inos.cn, kernel@...0n.name, 
	lianyangyang@...inos.cn, linux-kernel@...r.kernel.org, 
	loongarch@...ts.linux.dev, r@....cc, xry111@...111.site
Subject: Re: [PATCH v8 loongarch-next 3/3] LoongArch: Enable 128-bit atomics
 cmpxchg support

On Wed, Dec 31, 2025 at 11:45 AM George Guo <dongtai.guo@...ux.dev> wrote:
>
> From: George Guo <guodongtai@...inos.cn>
>
> Add select HAVE_CMPXCHG_DOUBLE and select HAVE_ALIGNED_STRUCT_PAGE in Kconfig
> to enable 128-bit atomic cmpxchg support on LoongArch.
>

Reviewed-by: Hengqi Chen <hengqi.chen@...il.com>
Tested-by: Hengqi Chen <hengqi.chen@...il.com>

> Signed-off-by: George Guo <guodongtai@...inos.cn>
> ---
>  arch/loongarch/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index 730f34214519..f9845ebec1a4 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -114,6 +114,7 @@ config LOONGARCH
>         select GENERIC_TIME_VSYSCALL
>         select GPIOLIB
>         select HAS_IOPORT
> +       select HAVE_ALIGNED_STRUCT_PAGE
>         select HAVE_ARCH_AUDITSYSCALL
>         select HAVE_ARCH_BITREVERSE
>         select HAVE_ARCH_JUMP_LABEL
> @@ -130,6 +131,7 @@ config LOONGARCH
>         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
>         select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
>         select HAVE_ASM_MODVERSIONS
> +       select HAVE_CMPXCHG_DOUBLE
>         select HAVE_CONTEXT_TRACKING_USER
>         select HAVE_C_RECORDMCOUNT
>         select HAVE_DEBUG_KMEMLEAK
> --
> 2.49.0
>