1 files changed, 9 insertions, 15 deletions

diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
index 1d719d5b4bb9..c1adf7ba3fd1 100644
--- a/arch/um/kernel/process_kern.c
+++ b/arch/um/kernel/process_kern.c
@@ -115,16 +115,6 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
         return(pid);
 }
 
-void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
-               struct task_struct *tsk)
-{
-        int cpu = smp_processor_id();
-
-        if (prev != next) 
-                cpu_clear(cpu, prev->cpu_vm_mask);
-        cpu_set(cpu, next->cpu_vm_mask);
-}
-
 void set_current(void *t)
 {
         struct task_struct *task = t;
@@ -152,7 +142,6 @@ void release_thread(struct task_struct *task)
  
 void exit_thread(void)
 {
-        CHOOSE_MODE(exit_thread_tt(), exit_thread_skas());
         unprotect_stack((unsigned long) current_thread);
 }
  
@@ -161,10 +150,6 @@ void *get_current(void)
         return(current);
 }
 
-void prepare_to_copy(struct task_struct *tsk)
-{
-}
-
 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
                 unsigned long stack_top, struct task_struct * p, 
                 struct pt_regs *regs)
@@ -480,12 +465,21 @@ int singlestepping(void * t)
         return 2;
 }
 
+/*
+ * Only x86 and x86_64 have an arch_align_stack().
+ * All other arches have "#define arch_align_stack(x) (x)"
+ * in their asm/system.h
+ * As this is included in UML from asm-um/system-generic.h,
+ * we can use it to behave as the subarch does.
+ */
+#ifndef arch_align_stack
 unsigned long arch_align_stack(unsigned long sp)
 {
         if (randomize_va_space)
                 sp -= get_random_int() % 8192;
         return sp & ~0xf;
 }
+#endif
 
 
 /*