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

Commit-ID:     dbafa16ec2b6be40055db181c99f2529b20dd951
Gitweb:        https://git.kernel.org/tip/dbafa16ec2b6be40055db181c99f2529b20dd951
Author:        Ingo Molnar <mingo@kernel.org>
AuthorDate:    Fri, 25 Apr 2025 10:42:01 +02:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Wed, 06 May 2026 08:02:10 +02:00

x86/cpu: Remove TSC-less CONFIG_M586 support

Remove support for TSC-less Pentium variants.

All TSC-capable Pentium variants, derivatives and
clones should still work under the M586TSC or M586MMX
options.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250425084216.3913608-5-mingo@kernel.org
---
 arch/x86/Kconfig.cpu            | 10 +---------
 arch/x86/Makefile_32.cpu        |  1 -
 arch/x86/include/asm/vermagic.h |  2 --
 3 files changed, 1 insertion(+), 12 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 71f2644..9b91209 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -43,14 +43,6 @@ choice
 	  See each option's help text for additional details. If you don't know
 	  what to do, choose "Pentium-Pro".
 
-config M586
-	bool "586/K5/5x86/6x86/6x86MX"
-	depends on X86_32
-	help
-	  Select this for an 586 or 686 series processor such as the AMD K5,
-	  the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
-	  assume the RDTSC (Read Time Stamp Counter) instruction.
-
 config M586TSC
 	bool "Pentium-Classic"
 	depends on X86_32
@@ -250,7 +242,7 @@ 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 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 || MVIAC3_2 || MGEODE_LX
 
 config X86_F00F_BUG
 	def_bool y
diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu
index 707827f..ec9f34d 100644
--- a/arch/x86/Makefile_32.cpu
+++ b/arch/x86/Makefile_32.cpu
@@ -10,7 +10,6 @@ else
 align		:= -falign-functions=0 -falign-jumps=0 -falign-loops=0
 endif
 
-cflags-$(CONFIG_M586)		+= -march=i586
 cflags-$(CONFIG_M586TSC)	+= -march=i586
 cflags-$(CONFIG_M586MMX)	+= -march=pentium-mmx
 cflags-$(CONFIG_M686)		+= -march=i686
diff --git a/arch/x86/include/asm/vermagic.h b/arch/x86/include/asm/vermagic.h
index b3a8beb..e26061d 100644
--- a/arch/x86/include/asm/vermagic.h
+++ b/arch/x86/include/asm/vermagic.h
@@ -5,8 +5,6 @@
 
 #ifdef CONFIG_X86_64
 /* X86_64 does not define MODULE_PROC_FAMILY */
-#elif defined CONFIG_M586
-#define MODULE_PROC_FAMILY "586 "
 #elif defined CONFIG_M586TSC
 #define MODULE_PROC_FAMILY "586TSC "
 #elif defined CONFIG_M586MMX