linux-kernel - [PATCH 02/15] x86/cpu: Remove CONFIG

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Message-ID: <20250425084216.3913608-3-mingo@kernel.org>
Date: Fri, 25 Apr 2025 10:41:59 +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>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 02/15] x86/cpu: Remove CONFIG_MWINCHIP3D/MWINCHIPC6

These CPUs lack CMPXCHG8B support, according to Arnd Bergmann:

  | "Winchip6 (486-class, no tsc, no cx8) and Winchip3D
  | (486-class, with tsc but no cx8)"

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/Kconfig.cpu            | 28 ++++------------------------
 arch/x86/Makefile_32.cpu        |  2 --
 arch/x86/include/asm/vermagic.h |  4 ----
 3 files changed, 4 insertions(+), 30 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 881d5f5ae7d5..f656033b3a8a 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -32,8 +32,6 @@ choice
 	  - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
 	  - "Crusoe" for the Transmeta Crusoe series.
 	  - "Efficeon" for the Transmeta Efficeon series.
-	  - "Winchip-C6" for original IDT Winchip.
-	  - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
 	  - "AMD Elan" for the 32-bit AMD Elan embedded CPU.
 	  - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
 	  - "Geode GX/LX" For AMD Geode GX and LX processors.
@@ -155,24 +153,6 @@ config MEFFICEON
 	help
 	  Select this for a Transmeta Efficeon processor.
 
-config MWINCHIPC6
-	bool "Winchip-C6"
-	depends on X86_32
-	help
-	  Select this for an IDT Winchip C6 chip.  Linux and GCC
-	  treat this chip as a 586TSC with some extended instructions
-	  and alignment requirements.
-
-config MWINCHIP3D
-	bool "Winchip-2/Winchip-2A/Winchip-3"
-	depends on X86_32
-	help
-	  Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
-	  treat this chip as a 586TSC with some extended instructions
-	  and alignment requirements.  Also enable out of order memory
-	  stores for this CPU, which can increase performance of some
-	  operations.
-
 config MGEODEGX1
 	bool "GeodeGX1"
 	depends on X86_32
@@ -246,7 +226,7 @@ config X86_L1_CACHE_SHIFT
 	default "7" if MPENTIUM4
 	default "6" if MK7 || MPENTIUMM || MATOM || MVIAC7 || X86_GENERIC || X86_64
 	default "4" if MGEODEGX1
-	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
+	default "5" if MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 
 config X86_F00F_BUG
 	def_bool y
@@ -258,7 +238,7 @@ config X86_INVD_BUG
 
 config X86_ALIGNMENT_16
 	def_bool y
-	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK6 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1
+	depends on MCYRIXIII || MK6 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1
 
 config X86_INTEL_USERCOPY
 	def_bool y
@@ -266,7 +246,7 @@ config X86_INTEL_USERCOPY
 
 config X86_USE_PPRO_CHECKSUM
 	def_bool y
-	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MATOM
+	depends on MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MATOM
 
 config X86_TSC
 	def_bool y
@@ -295,7 +275,7 @@ config X86_MINIMUM_CPU_FAMILY
 
 config X86_DEBUGCTLMSR
 	def_bool y
-	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586) && !UML
+	depends on !(MK6 || MCYRIXIII || M586MMX || M586TSC || M586) && !UML
 
 config IA32_FEAT_CTL
 	def_bool y
diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu
index 98ca6dd70d01..2dda0a19b06a 100644
--- a/arch/x86/Makefile_32.cpu
+++ b/arch/x86/Makefile_32.cpu
@@ -24,8 +24,6 @@ cflags-$(CONFIG_MK6)		+= -march=k6
 cflags-$(CONFIG_MK7)		+= -march=athlon
 cflags-$(CONFIG_MCRUSOE)	+= -march=i686 $(align)
 cflags-$(CONFIG_MEFFICEON)	+= -march=i686 $(call tune,pentium3) $(align)
-cflags-$(CONFIG_MWINCHIPC6)	+= $(call cc-option,-march=winchip-c6,-march=i586)
-cflags-$(CONFIG_MWINCHIP3D)	+= $(call cc-option,-march=winchip2,-march=i586)
 cflags-$(CONFIG_MCYRIXIII)	+= $(call cc-option,-march=c3,-march=i486) $(align)
 cflags-$(CONFIG_MVIAC3_2)	+= $(call cc-option,-march=c3-2,-march=i686)
 cflags-$(CONFIG_MVIAC7)		+= -march=i686
diff --git a/arch/x86/include/asm/vermagic.h b/arch/x86/include/asm/vermagic.h
index eda233a90ea8..b3a8beb32dfd 100644
--- a/arch/x86/include/asm/vermagic.h
+++ b/arch/x86/include/asm/vermagic.h
@@ -31,10 +31,6 @@
 #define MODULE_PROC_FAMILY "CRUSOE "
 #elif defined CONFIG_MEFFICEON
 #define MODULE_PROC_FAMILY "EFFICEON "
-#elif defined CONFIG_MWINCHIPC6
-#define MODULE_PROC_FAMILY "WINCHIPC6 "
-#elif defined CONFIG_MWINCHIP3D
-#define MODULE_PROC_FAMILY "WINCHIP3D "
 #elif defined CONFIG_MCYRIXIII
 #define MODULE_PROC_FAMILY "CYRIXIII "
 #elif defined CONFIG_MVIAC3_2
-- 
2.45.2