3 files changed, 11 insertions, 9 deletions

diff --git a/arch/um/kernel/tt/include/uaccess-tt.h b/arch/um/kernel/tt/include/uaccess-tt.h
index aa6db384af80..dc2ebfa8c54f 100644
--- a/arch/um/kernel/tt/include/uaccess-tt.h
+++ b/arch/um/kernel/tt/include/uaccess-tt.h
@@ -33,12 +33,6 @@ extern unsigned long uml_physmem;
          (((unsigned long) (addr) <= ((unsigned long) (addr) + (size))) && \
           (under_task_size(addr, size) || is_stack(addr, size))))
 
-static inline int verify_area_tt(int type, const void __user * addr,
-                                 unsigned long size)
-{
-        return(access_ok_tt(type, addr, size) ? 0 : -EFAULT);
-}
-
 extern unsigned long get_fault_addr(void);
 
 extern int __do_copy_from_user(void *to, const void *from, int n,
diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c
index 0de05a268b22..cfaa373a6e77 100644
--- a/arch/um/kernel/tt/process_kern.c
+++ b/arch/um/kernel/tt/process_kern.c
@@ -23,10 +23,11 @@
 #include "mem_user.h"
 #include "tlb.h"
 #include "mode.h"
+#include "mode_kern.h"
 #include "init.h"
 #include "tt.h"
 
-int switch_to_tt(void *prev, void *next, void *last)
+void switch_to_tt(void *prev, void *next)
 {
         struct task_struct *from, *to, *prev_sched;
         unsigned long flags;
diff --git a/arch/um/kernel/tt/uaccess_user.c b/arch/um/kernel/tt/uaccess_user.c
index f01475512ecb..8c220f054b61 100644
--- a/arch/um/kernel/tt/uaccess_user.c
+++ b/arch/um/kernel/tt/uaccess_user.c
@@ -22,8 +22,15 @@ int __do_copy_from_user(void *to, const void *from, int n,
                                __do_copy, &faulted);
         TASK_REGS(get_current())->tt = save;
 
-        if(!faulted) return(0);
-        else return(n - (fault - (unsigned long) from));
+        if(!faulted)
+                return 0;
+        else if (fault)
+                return n - (fault - (unsigned long) from);
+        else
+                /* In case of a general protection fault, we don't have the
+                 * fault address, so NULL is used instead. Pretend we didn't
+                 * copy anything. */
+                return n;
 }
 
 static void __do_strncpy(void *dst, const void *src, int count)