3 files changed, 73 insertions, 65 deletions

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index ee76eaad3001..25b4c063fbf6 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -5,7 +5,7 @@
 obj-y                   := intel_cacheinfo.o addon_cpuid_features.o
 obj-y                   += proc.o feature_names.o
 
-obj-$(CONFIG_X86_32)    += common.o bugs.o
+obj-$(CONFIG_X86_32)    += common.o bugs.o cmpxchg.o
 obj-$(CONFIG_X86_64)    += common_64.o bugs_64.o
 obj-$(CONFIG_X86_32)    += amd.o
 obj-$(CONFIG_X86_64)    += amd_64.o
diff --git a/arch/x86/kernel/cpu/cmpxchg.c b/arch/x86/kernel/cpu/cmpxchg.c
new file mode 100644
index 000000000000..2056ccf572cc
--- /dev/null
+++ b/arch/x86/kernel/cpu/cmpxchg.c
@@ -0,0 +1,72 @@
+/*
+ * cmpxchg*() fallbacks for CPU not supporting these instructions
+ */
+
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/module.h>
+
+#ifndef CONFIG_X86_CMPXCHG
+unsigned long cmpxchg_386_u8(volatile void *ptr, u8 old, u8 new)
+{
+        u8 prev;
+        unsigned long flags;
+
+        /* Poor man's cmpxchg for 386. Unsuitable for SMP */
+        local_irq_save(flags);
+        prev = *(u8 *)ptr;
+        if (prev == old)
+                *(u8 *)ptr = new;
+        local_irq_restore(flags);
+        return prev;
+}
+EXPORT_SYMBOL(cmpxchg_386_u8);
+
+unsigned long cmpxchg_386_u16(volatile void *ptr, u16 old, u16 new)
+{
+        u16 prev;
+        unsigned long flags;
+
+        /* Poor man's cmpxchg for 386. Unsuitable for SMP */
+        local_irq_save(flags);
+        prev = *(u16 *)ptr;
+        if (prev == old)
+                *(u16 *)ptr = new;
+        local_irq_restore(flags);
+        return prev;
+}
+EXPORT_SYMBOL(cmpxchg_386_u16);
+
+unsigned long cmpxchg_386_u32(volatile void *ptr, u32 old, u32 new)
+{
+        u32 prev;
+        unsigned long flags;
+
+        /* Poor man's cmpxchg for 386. Unsuitable for SMP */
+        local_irq_save(flags);
+        prev = *(u32 *)ptr;
+        if (prev == old)
+                *(u32 *)ptr = new;
+        local_irq_restore(flags);
+        return prev;
+}
+EXPORT_SYMBOL(cmpxchg_386_u32);
+#endif
+
+#ifndef CONFIG_X86_CMPXCHG64
+unsigned long long cmpxchg_486_u64(volatile void *ptr, u64 old, u64 new)
+{
+        u64 prev;
+        unsigned long flags;
+
+        /* Poor man's cmpxchg8b for 386 and 486. Unsuitable for SMP */
+        local_irq_save(flags);
+        prev = *(u64 *)ptr;
+        if (prev == old)
+                *(u64 *)ptr = new;
+        local_irq_restore(flags);
+        return prev;
+}
+EXPORT_SYMBOL(cmpxchg_486_u64);
+#endif
+
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5c8959b8a42e..77618c717d76 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -307,69 +307,5 @@ static struct cpu_dev intel_cpu_dev __cpuinitdata = {
 
 cpu_vendor_dev_register(X86_VENDOR_INTEL, &intel_cpu_dev);
 
-#ifndef CONFIG_X86_CMPXCHG
-unsigned long cmpxchg_386_u8(volatile void *ptr, u8 old, u8 new)
-{
-        u8 prev;
-        unsigned long flags;
-
-        /* Poor man's cmpxchg for 386. Unsuitable for SMP */
-        local_irq_save(flags);
-        prev = *(u8 *)ptr;
-        if (prev == old)
-                *(u8 *)ptr = new;
-        local_irq_restore(flags);
-        return prev;
-}
-EXPORT_SYMBOL(cmpxchg_386_u8);
-
-unsigned long cmpxchg_386_u16(volatile void *ptr, u16 old, u16 new)
-{
-        u16 prev;
-        unsigned long flags;
-
-        /* Poor man's cmpxchg for 386. Unsuitable for SMP */
-        local_irq_save(flags);
-        prev = *(u16 *)ptr;
-        if (prev == old)
-                *(u16 *)ptr = new;
-        local_irq_restore(flags);
-        return prev;
-}
-EXPORT_SYMBOL(cmpxchg_386_u16);
-
-unsigned long cmpxchg_386_u32(volatile void *ptr, u32 old, u32 new)
-{
-        u32 prev;
-        unsigned long flags;
-
-        /* Poor man's cmpxchg for 386. Unsuitable for SMP */
-        local_irq_save(flags);
-        prev = *(u32 *)ptr;
-        if (prev == old)
-                *(u32 *)ptr = new;
-        local_irq_restore(flags);
-        return prev;
-}
-EXPORT_SYMBOL(cmpxchg_386_u32);
-#endif
-
-#ifndef CONFIG_X86_CMPXCHG64
-unsigned long long cmpxchg_486_u64(volatile void *ptr, u64 old, u64 new)
-{
-        u64 prev;
-        unsigned long flags;
-
-        /* Poor man's cmpxchg8b for 386 and 486. Unsuitable for SMP */
-        local_irq_save(flags);
-        prev = *(u64 *)ptr;
-        if (prev == old)
-                *(u64 *)ptr = new;
-        local_irq_restore(flags);
-        return prev;
-}
-EXPORT_SYMBOL(cmpxchg_486_u64);
-#endif
-
 /* arch_initcall(intel_cpu_init); */