linux-kernel - Re: [PATCH 15/15] x86/atomics: Remove !CONFIG_X86

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Message-ID: <aA3qGMf759kePUFI@gmail.com>
Date: Sun, 27 Apr 2025 10:26:00 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Uros Bizjak <ubizjak@...il.com>
Cc: linux-kernel@...r.kernel.org, "Ahmed S . Darwish" <darwi@...utronix.de>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	John Ogness <john.ogness@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 15/15] x86/atomics: Remove !CONFIG_X86_CX8 methods


* Uros Bizjak <ubizjak@...il.com> wrote:

> 
> 
> On 25. 04. 25 10:42, Ingo Molnar wrote:
> 
> > -#endif
> > +#define arch_cmpxchg64			__cmpxchg64
> > +#define arch_cmpxchg64_local		__cmpxchg64_local
> > +#define arch_try_cmpxchg64		__try_cmpxchg64
> > +#define arch_try_cmpxchg64_local	__try_cmpxchg64_local
> >   #define system_has_cmpxchg64()		boot_cpu_has(X86_FEATURE_CX8)
> 
> #define system_has_cmpxchg64()		1

Thanks, I've updated the patch with the change below.

	Ingo

===========>
 arch/x86/include/asm/cmpxchg_32.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/cmpxchg_32.h b/arch/x86/include/asm/cmpxchg_32.h
index 5902fa5af93b..6c7b37bc65c1 100644
--- a/arch/x86/include/asm/cmpxchg_32.h
+++ b/arch/x86/include/asm/cmpxchg_32.h
@@ -74,6 +74,6 @@ static __always_inline bool __try_cmpxchg64_local(volatile u64 *ptr, u64 *oldp,
 #define arch_try_cmpxchg64		__try_cmpxchg64
 #define arch_try_cmpxchg64_local	__try_cmpxchg64_local
 
-#define system_has_cmpxchg64()		boot_cpu_has(X86_FEATURE_CX8)
+#define system_has_cmpxchg64()		1
 
 #endif /* _ASM_X86_CMPXCHG_32_H */