linux-kernel - Re: [PATCH v2 01/11] x86/Kconfig: Geode CPU has cmpxchg8b

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Message-ID: <CAMzpN2g+h0+7-ywjPVc=YTYgRVto=sseVf3k2apCMvypC=fkAg@mail.gmail.com>
Date: Tue, 10 Dec 2024 11:00:38 -0500
From: Brian Gerst <brgerst@...il.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	"H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Andy Shevchenko <andy@...nel.org>, Matthew Wilcox <willy@...radead.org>, stable@...r.kernel.org
Subject: Re: [PATCH v2 01/11] x86/Kconfig: Geode CPU has cmpxchg8b

On Tue, Dec 10, 2024 at 9:50 AM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> An older cleanup of mine inadvertently removed geode-gx1 and geode-lx
> from the list of CPUs that are known to support a working cmpxchg8b.
>
> Fixes: 88a2b4edda3d ("x86/Kconfig: Rework CONFIG_X86_PAE dependency")
> Cc: stable@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/x86/Kconfig.cpu | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
> index 2a7279d80460..42e6a40876ea 100644
> --- a/arch/x86/Kconfig.cpu
> +++ b/arch/x86/Kconfig.cpu
> @@ -368,7 +368,7 @@ config X86_HAVE_PAE
>
>  config X86_CMPXCHG64
>         def_bool y
> -       depends on X86_HAVE_PAE || M586TSC || M586MMX || MK6 || MK7
> +       depends on X86_HAVE_PAE || M586TSC || M586MMX || MK6 || MK7 || MGEODEGX1 || MGEODE_LX
>
>  # this should be set for all -march=.. options where the compiler
>  # generates cmov.
> --
> 2.39.5
>
>

An idea for a future cleanup would be to change lists like this to
select statements.  That would make it easier to see what each CPU
option enables.


Brian Gerst