1 files changed, 16 insertions, 4 deletions

diff --git a/arch/m68k/include/asm/system.h b/arch/m68k/include/asm/system.h
index 47b01f4726bc..a10c4d1241de 100644
--- a/arch/m68k/include/asm/system.h
+++ b/arch/m68k/include/asm/system.h
@@ -68,6 +68,8 @@ asmlinkage void resume(void);
 struct __xchg_dummy { unsigned long a[100]; };
 #define __xg(x) ((volatile struct __xchg_dummy *)(x))
 
+extern unsigned long __invalid_xchg_size(unsigned long, volatile void *, int);
+
 #ifndef CONFIG_RMW_INSNS
 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
 {
@@ -92,7 +94,8 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
                 x = tmp;
                 break;
         default:
-                BUG();
+                tmp = __invalid_xchg_size(x, ptr, size);
+                break;
         }
 
         local_irq_restore(flags);
@@ -102,7 +105,7 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
 {
         switch (size) {
-            case 1:
+        case 1:
                 __asm__ __volatile__
                         ("moveb %2,%0\n\t"
                          "1:\n\t"
@@ -110,7 +113,7 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
                          "jne 1b"
                          : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
                 break;
-            case 2:
+        case 2:
                 __asm__ __volatile__
                         ("movew %2,%0\n\t"
                          "1:\n\t"
@@ -118,7 +121,7 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
                          "jne 1b"
                          : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
                 break;
-            case 4:
+        case 4:
                 __asm__ __volatile__
                         ("movel %2,%0\n\t"
                          "1:\n\t"
@@ -126,6 +129,9 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
                          "jne 1b"
                          : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
                 break;
+        default:
+                x = __invalid_xchg_size(x, ptr, size);
+                break;
         }
         return x;
 }
@@ -135,6 +141,9 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
 
 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 
+extern unsigned long __invalid_cmpxchg_size(volatile void *,
+                                            unsigned long, unsigned long, int);
+
 /*
  * Atomic compare and exchange.  Compare OLD with MEM, if identical,
  * store NEW in MEM.  Return the initial value in MEM.  Success is
@@ -162,6 +171,9 @@ static inline unsigned long __cmpxchg(volatile void *p, unsigned long old,
                                       : "=d" (old), "=m" (*(int *)p)
                                       : "d" (new), "0" (old), "m" (*(int *)p));
                 break;
+        default:
+                old = __invalid_cmpxchg_size(p, old, new, size);
+                break;
         }
         return old;
 }