[tip: x86/cpu] x86/cpu: Make CONFIG_X86_CX8 unconditional

[tip-bot2 for Ingo Molnar]

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     2bebd986eddb31f9ff1e02e9245a318036280759
Gitweb:        https://git.kernel.org/tip/2bebd986eddb31f9ff1e02e9245a318036280759
Author:        Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate:    Mon, 27 Apr 2026 08:11:18 +02:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 11 Jun 2026 10:25:40 +02:00

x86/cpu: Make CONFIG_X86_CX8 unconditional

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

( This was preceded by the removal of all non-CX8 platform build
  options, so it should have no functional effects in theory. )

Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Ahmed S . Darwish <darwi@xxxxxxxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: H . Peter Anvin <hpa@xxxxxxxxx>
Cc: John Ogness <john.ogness@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20250425084216.3913608-14-mingo@xxxxxxxxxx
---
 arch/x86/Kconfig             | 2 +-
 arch/x86/Kconfig.cpu         | 1 -
 arch/x86/Kconfig.cpufeatures | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f4b8722..bd548dc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -133,7 +133,7 @@ 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 678fdc1..6611144 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -269,7 +269,6 @@ 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.
diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures
index 89cbf8f..09833c8 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.