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From: Ingo Molnar <mingo@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	"Ahmed S . Darwish" <darwi@linutronix.de>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@kernel.org>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H . Peter Anvin" <hpa@zytor.com>,
	John Ogness <john.ogness@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 13/15] x86/cpu: Make CONFIG_X86_CX8 unconditional
Date: Fri, 25 Apr 2025 10:42:10 +0200	[thread overview]
Message-ID: <20250425084216.3913608-14-mingo@kernel.org> (raw)
In-Reply-To: <20250425084216.3913608-1-mingo@kernel.org>

I.e. it's a boot time requirement for the CPU to support it.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/Kconfig             | 2 +-
 arch/x86/Kconfig.cpu         | 3 +--
 arch/x86/Kconfig.cpufeatures | 1 -
 3 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 465e5abd2750..a9d717558972 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -136,7 +136,7 @@ config X86
 	select ARCH_SUPPORTS_AUTOFDO_CLANG
 	select ARCH_SUPPORTS_PROPELLER_CLANG    if X86_64
 	select ARCH_USE_BUILTIN_BSWAP
-	select ARCH_USE_CMPXCHG_LOCKREF		if X86_CX8
+	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_USE_MEMTEST
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 30466a258db8..6f1e8cc8fe58 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -245,7 +245,6 @@ config X86_HAVE_PAE
 
 config X86_CX8
 	def_bool y
-	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.
@@ -257,7 +256,7 @@ config X86_MINIMUM_CPU_FAMILY
 	int
 	default "64" if X86_64
 	default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MK7)
-	default "5" if X86_32 && X86_CX8
+	default "5" if X86_32
 	default "4"
 
 config X86_DEBUGCTLMSR
diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures
index cd551818f451..f04ae53435bc 100644
--- a/arch/x86/Kconfig.cpufeatures
+++ b/arch/x86/Kconfig.cpufeatures
@@ -42,7 +42,6 @@ config X86_REQUIRED_FEATURE_NOPL
 
 config X86_REQUIRED_FEATURE_CX8
 	def_bool y
-	depends on X86_CX8
 
 # this should be set for all -march=.. options where the compiler
 # generates cmov.
-- 
2.45.2


  parent reply	other threads:[~2025-04-25  8:43 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-04-25  8:41 [RFC PATCH 0/15] x86: Remove support for TSC-less and CX8-less CPUs Ingo Molnar
2025-04-25  8:41 ` [PATCH 01/15] x86/cpu: Remove M486/M486SX/ELAN support Ingo Molnar
2025-04-25  8:41 ` [PATCH 02/15] x86/cpu: Remove CONFIG_MWINCHIP3D/MWINCHIPC6 Ingo Molnar
2025-04-25  8:42 ` [PATCH 03/15] x86/cpu: Remove CPU_SUP_UMC_32 support Ingo Molnar
2025-04-25  8:42 ` [PATCH 04/15] x86/cpu: Remove TSC-less CONFIG_M586 support Ingo Molnar
2025-04-25 15:09   ` H. Peter Anvin
2025-04-25  8:42 ` [PATCH 05/15] x86/cpu, x86/platform, watchdog: Remove CONFIG_X86_RDC321X support Ingo Molnar
2025-04-25  8:42 ` [PATCH 06/15] x86/cpu: Remove the CONFIG_X86_INVD_BUG quirk Ingo Molnar
2025-04-25  8:42 ` [PATCH 07/15] x86/cpu, cpufreq: Remove AMD ELAN support Ingo Molnar
2025-04-25  8:42 ` [PATCH 08/15] x86/fpu: Remove MATH_EMULATION and related glue code Ingo Molnar
2025-04-25  8:42 ` [PATCH 09/15] x86/fpu: Remove the 'no387' boot option Ingo Molnar
2025-04-25  8:42 ` [PATCH 10/15] x86/fpu: Remove the math-emu/ FPU emulation library Ingo Molnar
2025-04-25  8:42 ` [PATCH 11/15] x86/cpu: Make CONFIG_X86_TSC unconditional Ingo Molnar
2025-04-25  8:42 ` [PATCH 12/15] x86: Remove !CONFIG_X86_TSC code Ingo Molnar
2025-04-25  8:42 ` Ingo Molnar [this message]
2025-04-25 12:10   ` [PATCH 13/15] x86/cpu: Make CONFIG_X86_CX8 unconditional Arnd Bergmann
2025-04-25 15:15     ` H. Peter Anvin
2025-04-25 21:54       ` Arnd Bergmann
2025-04-27  9:25         ` Ingo Molnar
2025-04-27 17:32           ` Arnd Bergmann
2025-04-27 21:26             ` H. Peter Anvin
2025-04-28  9:16             ` Ingo Molnar
2025-04-28 11:21               ` Arnd Bergmann
2025-04-29 10:22                 ` Ingo Molnar
2025-04-29 12:10                   ` Arnd Bergmann
2025-04-27  8:15     ` Ingo Molnar
2025-04-25  8:42 ` [PATCH 14/15] x86/percpu: Remove !CONFIG_X86_CX8 methods Ingo Molnar
2025-04-25 14:05   ` Uros Bizjak
2025-04-27  7:46     ` [PATCH -v2 " Ingo Molnar
2025-04-25  8:42 ` [PATCH 15/15] x86/atomics: " Ingo Molnar
2025-04-25 13:55   ` Arnd Bergmann
2025-04-25 14:10   ` Uros Bizjak
2025-04-25 15:00     ` Brian Gerst
2025-04-27  8:23       ` Ingo Molnar
2025-04-27  8:26     ` Ingo Molnar
2025-04-27 10:31       ` Uros Bizjak
2025-05-15  8:49         ` Ingo Molnar
2025-04-25 11:13 ` [RFC PATCH 0/15] x86: Remove support for TSC-less and CX8-less CPUs Arnd Bergmann
2025-04-26  8:26 ` Pavel Machek
2025-05-05  8:53 ` Maciej W. Rozycki
2025-05-05 12:48   ` H. Peter Anvin
2025-05-05 13:04     ` Maciej W. Rozycki
2025-05-05 19:57       ` H. Peter Anvin
2025-05-05 20:54         ` Borislav Petkov
2025-05-06 13:51           ` Maciej W. Rozycki
2025-05-06 14:16             ` Borislav Petkov
2025-05-08 14:51               ` Maciej W. Rozycki
2025-05-08 20:11                 ` Borislav Petkov
2025-05-12 12:55                   ` Maciej W. Rozycki
2025-05-12 13:48                     ` Borislav Petkov
2025-05-12 17:29                       ` Maciej W. Rozycki
2025-05-13  2:00                         ` Linus Torvalds
2025-05-13  3:48                           ` H. Peter Anvin
2025-05-13  5:43                           ` John Paul Adrian Glaubitz
2025-05-13 21:55                             ` Maciej W. Rozycki
2025-05-13 22:02                               ` Linus Torvalds
2025-05-13 22:06                                 ` H. Peter Anvin
2025-05-15 16:32                                 ` Maciej W. Rozycki
2025-05-06 13:48         ` Maciej W. Rozycki
2025-05-06 13:54           ` John Paul Adrian Glaubitz
2025-05-05 15:59   ` Linus Torvalds
2025-05-06 13:53     ` Maciej W. Rozycki
2025-05-06 16:44       ` H. Peter Anvin
2025-05-06 17:11         ` Linus Torvalds
2025-05-06 17:51           ` H. Peter Anvin
2025-05-08 14:54             ` Maciej W. Rozycki
2025-05-08 14:53           ` Maciej W. Rozycki
2025-05-08 14:51         ` Maciej W. Rozycki
2025-05-15  8:56 [PATCH -v2 " Ingo Molnar
2025-05-15  8:57 ` [PATCH 13/15] x86/cpu: Make CONFIG_X86_CX8 unconditional Ingo Molnar
2025-12-14  8:46 [PATCH -v3 0/15] x86: Remove support for TSC-less and CX8-less CPUs Ingo Molnar
2025-12-14  8:47 ` [PATCH 13/15] x86/cpu: Make CONFIG_X86_CX8 unconditional Ingo Molnar

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