linux-kernel - Re: [PATCH v7 loongarch-next 4/4] LoongArch: Enable 128-bit atomics cmpxchg support

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Message-ID: <CAEyhmHR=gzyBbMYQb=sUyF5Ms7VyrhB2esqfxLddfUrBVy1FRg@mail.gmail.com>
Date: Tue, 30 Dec 2025 20:19:11 +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 v7 loongarch-next 4/4] LoongArch: Enable 128-bit atomics
 cmpxchg support

On Tue, Dec 30, 2025 at 9:34 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.
>
> 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..d4de823276d1 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
> @@ -141,6 +142,7 @@ config LOONGARCH
>         select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
>         select HAVE_DYNAMIC_FTRACE_WITH_REGS
>         select HAVE_EBPF_JIT
> +       select HAVE_CMPXCHG_DOUBLE
>         select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN
>         select HAVE_EXIT_THREAD
>         select HAVE_GENERIC_TIF_BITS
> --

Keep the list sorted ?

> 2.49.0
>