diff --git a/arch/m32r/kernel/m32r_ksyms.c b/arch/m32r/kernel/m32r_ksyms.c
index 700570747a90..b727e693c805 100644
--- a/arch/m32r/kernel/m32r_ksyms.c
+++ b/arch/m32r/kernel/m32r_ksyms.c
@@ -21,7 +21,6 @@ EXPORT_SYMBOL(boot_cpu_data);
 EXPORT_SYMBOL(dump_fpu);
 EXPORT_SYMBOL(__ioremap);
 EXPORT_SYMBOL(iounmap);
-EXPORT_SYMBOL(kernel_thread);
 
 EXPORT_SYMBOL(strncpy_from_user);
 EXPORT_SYMBOL(__strncpy_from_user);
diff --git a/arch/openrisc/include/asm/processor.h b/arch/openrisc/include/asm/processor.h
index 43decdbdb2ed..33691380608e 100644
--- a/arch/openrisc/include/asm/processor.h
+++ b/arch/openrisc/include/asm/processor.h
@@ -81,8 +81,6 @@ struct thread_struct {
 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->sp)
 
 
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
 void release_thread(struct task_struct *);
 unsigned long get_wchan(struct task_struct *p);
diff --git a/arch/parisc/include/asm/processor.h b/arch/parisc/include/asm/processor.h
index 0e8b7b8ce8a2..09b54a57a48d 100644
--- a/arch/parisc/include/asm/processor.h
+++ b/arch/parisc/include/asm/processor.h
@@ -326,7 +326,6 @@ struct mm_struct;
 
 /* Free all resources held by a thread. */
 extern void release_thread(struct task_struct *);
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 
 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 
diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h
index 879073e76586..2b70dfb1442e 100644
--- a/arch/tile/include/asm/processor.h
+++ b/arch/tile/include/asm/processor.h
@@ -220,8 +220,6 @@ static inline void release_thread(struct task_struct *dead_task)
 	/* Nothing for now */
 }
 
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
 extern int do_work_pending(struct pt_regs *regs, u32 flags);