linux-kernel - [PATCH 13/15] x86/cpu: Make CONFIG_X86

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Message-ID: <20250425084216.3913608-14-mingo@kernel.org>
Date: Fri, 25 Apr 2025 10:42:10 +0200
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.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: [PATCH 13/15] x86/cpu: Make CONFIG_X86_CX8 unconditional

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

Signed-off-by: Ingo Molnar <mingo@...nel.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