Merge branch 'x86-nuke386-for-linus' of git://git.kernel.org/pub/scm/…

…linux/kernel/git/tip/tip

Pull "Nuke 386-DX/SX support" from Ingo Molnar:
 "This tree removes ancient-386-CPUs support and thus zaps quite a bit
  of complexity:

    24 files changed, 56 insertions(+), 425 deletions(-)

  ... which complexity has plagued us with extra work whenever we wanted
  to change SMP primitives, for years.

  Unfortunately there's a nostalgic cost: your old original 386 DX33
  system from early 1991 won't be able to boot modern Linux kernels
  anymore.  Sniff."

I'm not sentimental.  Good riddance.

* 'x86-nuke386-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, 386 removal: Document Nx586 as a 386 and thus unsupported
  x86, cleanups: Simplify sync_core() in the case of no CPUID
  x86, 386 removal: Remove CONFIG_X86_POPAD_OK
  x86, 386 removal: Remove CONFIG_X86_WP_WORKS_OK
  x86, 386 removal: Remove CONFIG_INVLPG
  x86, 386 removal: Remove CONFIG_BSWAP
  x86, 386 removal: Remove CONFIG_XADD
  x86, 386 removal: Remove CONFIG_CMPXCHG
  x86, 386 removal: Remove CONFIG_M386 from Kconfig

arch/x86/Kconfig

@@ -69,8 +69,8 @@ config X86
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_DEBUG_KMEMLEAK
 	select ANON_INODES
-	select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386
-	select HAVE_CMPXCHG_LOCAL if !M386
+	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
+	select HAVE_CMPXCHG_LOCAL
 	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_ARCH_KMEMCHECK
 	select HAVE_USER_RETURN_NOTIFIER
@@ -171,13 +171,8 @@ config ARCH_MAY_HAVE_PC_FDC
 	def_bool y
 	depends on ISA_DMA_API
 
-config RWSEM_GENERIC_SPINLOCK
-	def_bool y
-	depends on !X86_XADD
-
 config RWSEM_XCHGADD_ALGORITHM
 	def_bool y
-	depends on X86_XADD
 
 config GENERIC_CALIBRATE_DELAY
 	def_bool y
@@ -1100,7 +1095,7 @@ config HIGHMEM4G
 
 config HIGHMEM64G
 	bool "64GB"
-	depends on !M386 && !M486
+	depends on !M486
 	select X86_PAE
 	---help---
 	  Select this if you have a 32-bit processor and more than 4

arch/x86/Kconfig.cpu

@@ -4,23 +4,24 @@ choice
 	default M686 if X86_32
 	default GENERIC_CPU if X86_64
 
-config M386
-	bool "386"
-	depends on X86_32 && !UML
+config M486
+	bool "486"
+	depends on X86_32
 	---help---
-	  This is the processor type of your CPU. This information is used for
-	  optimizing purposes. In order to compile a kernel that can run on
-	  all x86 CPU types (albeit not optimally fast), you can specify
-	  "386" here.
+	  This is the processor type of your CPU. This information is
+	  used for optimizing purposes. In order to compile a kernel
+	  that can run on all supported x86 CPU types (albeit not
+	  optimally fast), you can specify "486" here.
+
+	  Note that the 386 is no longer supported, this includes
+	  AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
+	  UMC 486SX-S and the NexGen Nx586.
 
 	  The kernel will not necessarily run on earlier architectures than
 	  the one you have chosen, e.g. a Pentium optimized kernel will run on
 	  a PPro, but not necessarily on a i486.
 
 	  Here are the settings recommended for greatest speed:
-	  - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
-	  486DLC/DLC2, and UMC 486SX-S.  Only "386" kernels will run on a 386
-	  class machine.
 	  - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
 	  SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
 	  - "586" for generic Pentium CPUs lacking the TSC
@@ -43,16 +44,7 @@ config M386
 	  - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
 	  - "VIA C7" for VIA C7.
 
-	  If you don't know what to do, choose "386".
-
-config M486
-	bool "486"
-	depends on X86_32
-	---help---
-	  Select this for a 486 series processor, either Intel or one of the
-	  compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
-	  DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
-	  U5S.
+	  If you don't know what to do, choose "486".
 
 config M586
 	bool "586/K5/5x86/6x86/6x86MX"
@@ -305,24 +297,16 @@ config X86_INTERNODE_CACHE_SHIFT
 	default "12" if X86_VSMP
 	default X86_L1_CACHE_SHIFT
 
-config X86_CMPXCHG
-	def_bool y
-	depends on X86_64 || (X86_32 && !M386)
-
 config X86_L1_CACHE_SHIFT
 	int
 	default "7" if MPENTIUM4 || MPSC
 	default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
-	default "4" if MELAN || M486 || M386 || MGEODEGX1
+	default "4" if MELAN || M486 || MGEODEGX1
 	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 
-config X86_XADD
-	def_bool y
-	depends on !M386
-
 config X86_PPRO_FENCE
 	bool "PentiumPro memory ordering errata workaround"
-	depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
+	depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
 	---help---
 	  Old PentiumPro multiprocessor systems had errata that could cause
 	  memory operations to violate the x86 ordering standard in rare cases.
@@ -335,27 +319,11 @@ config X86_PPRO_FENCE
 
 config X86_F00F_BUG
 	def_bool y
-	depends on M586MMX || M586TSC || M586 || M486 || M386
+	depends on M586MMX || M586TSC || M586 || M486
 
 config X86_INVD_BUG
 	def_bool y
-	depends on M486 || M386
-
-config X86_WP_WORKS_OK
-	def_bool y
-	depends on !M386
-
-config X86_INVLPG
-	def_bool y
-	depends on X86_32 && !M386
-
-config X86_BSWAP
-	def_bool y
-	depends on X86_32 && !M386
-
-config X86_POPAD_OK
-	def_bool y
-	depends on X86_32 && !M386
+	depends on M486
 
 config X86_ALIGNMENT_16
 	def_bool y
@@ -412,12 +380,11 @@ config X86_MINIMUM_CPU_FAMILY
 	default "64" if X86_64
 	default "6" if X86_32 && X86_P6_NOP
 	default "5" if X86_32 && X86_CMPXCHG64
-	default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
-	default "3"
+	default "4"
 
 config X86_DEBUGCTLMSR
 	def_bool y
-	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
+	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML
 
 menuconfig PROCESSOR_SELECT
 	bool "Supported processor vendors" if EXPERT
@@ -441,7 +408,7 @@ config CPU_SUP_INTEL
 config CPU_SUP_CYRIX_32
 	default y
 	bool "Support Cyrix processors" if PROCESSOR_SELECT
-	depends on M386 || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
+	depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
 	---help---
 	  This enables detection, tunings and quirks for Cyrix processors
 
@@ -495,7 +462,7 @@ config CPU_SUP_TRANSMETA_32
 config CPU_SUP_UMC_32
 	default y
 	bool "Support UMC processors" if PROCESSOR_SELECT
-	depends on M386 || M486 || (EXPERT && !64BIT)
+	depends on M486 || (EXPERT && !64BIT)
 	---help---
 	  This enables detection, tunings and quirks for UMC processors
 

arch/x86/Makefile_32.cpu

@@ -10,7 +10,6 @@ tune		= $(call cc-option,-mcpu=$(1),$(2))
 endif
 
 align := $(cc-option-align)
-cflags-$(CONFIG_M386)		+= -march=i386
 cflags-$(CONFIG_M486)		+= -march=i486
 cflags-$(CONFIG_M586)		+= -march=i586
 cflags-$(CONFIG_M586TSC)	+= -march=i586

arch/x86/include/asm/atomic.h

@@ -172,23 +172,7 @@ static inline int atomic_add_negative(int i, atomic_t *v)
  */
 static inline int atomic_add_return(int i, atomic_t *v)
 {
-#ifdef CONFIG_M386
-	int __i;
-	unsigned long flags;
-	if (unlikely(boot_cpu_data.x86 <= 3))
-		goto no_xadd;
-#endif
-	/* Modern 486+ processor */
 	return i + xadd(&v->counter, i);
-
-#ifdef CONFIG_M386
-no_xadd: /* Legacy 386 processor */
-	raw_local_irq_save(flags);
-	__i = atomic_read(v);
-	atomic_set(v, i + __i);
-	raw_local_irq_restore(flags);
-	return i + __i;
-#endif
 }
 
 /**

arch/x86/include/asm/cmpxchg_32.h

@@ -34,9 +34,7 @@ static inline void set_64bit(volatile u64 *ptr, u64 value)
 		     : "memory");
 }
 
-#ifdef CONFIG_X86_CMPXCHG
 #define __HAVE_ARCH_CMPXCHG 1
-#endif
 
 #ifdef CONFIG_X86_CMPXCHG64
 #define cmpxchg64(ptr, o, n)						\
@@ -73,59 +71,6 @@ static inline u64 __cmpxchg64_local(volatile u64 *ptr, u64 old, u64 new)
 	return prev;
 }
 
-#ifndef CONFIG_X86_CMPXCHG
-/*
- * Building a kernel capable running on 80386. It may be necessary to
- * simulate the cmpxchg on the 80386 CPU. For that purpose we define
- * a function for each of the sizes we support.
- */
-
-extern unsigned long cmpxchg_386_u8(volatile void *, u8, u8);
-extern unsigned long cmpxchg_386_u16(volatile void *, u16, u16);
-extern unsigned long cmpxchg_386_u32(volatile void *, u32, u32);
-
-static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old,
-					unsigned long new, int size)
-{
-	switch (size) {
-	case 1:
-		return cmpxchg_386_u8(ptr, old, new);
-	case 2:
-		return cmpxchg_386_u16(ptr, old, new);
-	case 4:
-		return cmpxchg_386_u32(ptr, old, new);
-	}
-	return old;
-}
-
-#define cmpxchg(ptr, o, n)						\
-({									\
-	__typeof__(*(ptr)) __ret;					\
-	if (likely(boot_cpu_data.x86 > 3))				\
-		__ret = (__typeof__(*(ptr)))__cmpxchg((ptr),		\
-				(unsigned long)(o), (unsigned long)(n),	\
-				sizeof(*(ptr)));			\
-	else								\
-		__ret = (__typeof__(*(ptr)))cmpxchg_386((ptr),		\
-				(unsigned long)(o), (unsigned long)(n),	\
-				sizeof(*(ptr)));			\
-	__ret;								\
-})
-#define cmpxchg_local(ptr, o, n)					\
-({									\
-	__typeof__(*(ptr)) __ret;					\
-	if (likely(boot_cpu_data.x86 > 3))				\
-		__ret = (__typeof__(*(ptr)))__cmpxchg_local((ptr),	\
-				(unsigned long)(o), (unsigned long)(n),	\
-				sizeof(*(ptr)));			\
-	else								\
-		__ret = (__typeof__(*(ptr)))cmpxchg_386((ptr),		\
-				(unsigned long)(o), (unsigned long)(n),	\
-				sizeof(*(ptr)));			\
-	__ret;								\
-})
-#endif
-
 #ifndef CONFIG_X86_CMPXCHG64
 /*
  * Building a kernel capable running on 80386 and 80486. It may be necessary

arch/x86/include/asm/cpufeature.h

@@ -313,12 +313,6 @@ extern const char * const x86_power_flags[32];
 #define cpu_has_eager_fpu	boot_cpu_has(X86_FEATURE_EAGER_FPU)
 #define cpu_has_topoext		boot_cpu_has(X86_FEATURE_TOPOEXT)
 
-#if defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_64)
-# define cpu_has_invlpg		1
-#else
-# define cpu_has_invlpg		(boot_cpu_data.x86 > 3)
-#endif
-
 #ifdef CONFIG_X86_64
 
 #undef  cpu_has_vme

arch/x86/include/asm/futex.h

@@ -55,12 +55,6 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
 		return -EFAULT;
 
-#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP)
-	/* Real i386 machines can only support FUTEX_OP_SET */
-	if (op != FUTEX_OP_SET && boot_cpu_data.x86 == 3)
-		return -ENOSYS;
-#endif
-
 	pagefault_disable();
 
 	switch (op) {
@@ -118,12 +112,6 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 {
 	int ret = 0;
 
-#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP)
-	/* Real i386 machines have no cmpxchg instruction */
-	if (boot_cpu_data.x86 == 3)
-		return -ENOSYS;
-#endif
-
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
 		return -EFAULT;
 

arch/x86/include/asm/local.h

@@ -124,27 +124,11 @@ static inline int local_add_negative(long i, local_t *l)
  */
 static inline long local_add_return(long i, local_t *l)
 {
-	long __i;
-#ifdef CONFIG_M386
-	unsigned long flags;
-	if (unlikely(boot_cpu_data.x86 <= 3))
-		goto no_xadd;
-#endif
-	/* Modern 486+ processor */
-	__i = i;
+	long __i = i;
 	asm volatile(_ASM_XADD "%0, %1;"
 		     : "+r" (i), "+m" (l->a.counter)
 		     : : "memory");
 	return i + __i;
-
-#ifdef CONFIG_M386
-no_xadd: /* Legacy 386 processor */
-	local_irq_save(flags);
-	__i = local_read(l);
-	local_set(l, i + __i);
-	local_irq_restore(flags);
-	return i + __i;
-#endif
 }
 
 static inline long local_sub_return(long i, local_t *l)

arch/x86/include/asm/module.h

@@ -5,8 +5,6 @@
 
 #ifdef CONFIG_X86_64
 /* X86_64 does not define MODULE_PROC_FAMILY */
-#elif defined CONFIG_M386
-#define MODULE_PROC_FAMILY "386 "
 #elif defined CONFIG_M486
 #define MODULE_PROC_FAMILY "486 "
 #elif defined CONFIG_M586

arch/x86/include/asm/percpu.h

@@ -406,7 +406,6 @@ do {									\
 #define this_cpu_xchg_2(pcp, nval)	percpu_xchg_op(pcp, nval)
 #define this_cpu_xchg_4(pcp, nval)	percpu_xchg_op(pcp, nval)
 
-#ifndef CONFIG_M386
 #define __this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
 #define __this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
 #define __this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
@@ -421,8 +420,6 @@ do {									\
 #define this_cpu_cmpxchg_2(pcp, oval, nval)	percpu_cmpxchg_op(pcp, oval, nval)
 #define this_cpu_cmpxchg_4(pcp, oval, nval)	percpu_cmpxchg_op(pcp, oval, nval)
 
-#endif /* !CONFIG_M386 */
-
 #ifdef CONFIG_X86_CMPXCHG64
 #define percpu_cmpxchg8b_double(pcp1, pcp2, o1, o2, n1, n2)		\
 ({									\