Merge branch 'avr32-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemo...

[linux-2.6] / include / asm-s390 / system.h

diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index 64a3cd05cae1abb0a764665ef1110e5ae6567739..15aba30601a396e7ab020bcb1f1d1c8c49ee61ef 100644 (file)
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -130,6 +130,8 @@ extern void pfault_fini(void);
        __ret;                                                            \
 })
 
+extern void __xchg_called_with_bad_pointer(void);
+
 static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
 {
        unsigned long addr, old;
@@ -150,8 +152,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
                        : "=&d" (old), "=m" (*(int *) addr)
                        : "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
                          "m" (*(int *) addr) : "memory", "cc", "0");
-               x = old >> shift;
-               break;
+               return old >> shift;
        case 2:
                addr = (unsigned long) ptr;
                shift = (2 ^ (addr & 2)) << 3;
@@ -166,8 +167,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
                        : "=&d" (old), "=m" (*(int *) addr)
                        : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
                          "m" (*(int *) addr) : "memory", "cc", "0");
-               x = old >> shift;
-               break;
+               return old >> shift;
        case 4:
                asm volatile(
                        "       l       %0,0(%3)\n"
@@ -176,8 +176,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
                        : "=&d" (old), "=m" (*(int *) ptr)
                        : "d" (x), "a" (ptr), "m" (*(int *) ptr)
                        : "memory", "cc");
-               x = old;
-               break;
+               return old;
 #ifdef __s390x__
        case 8:
                asm volatile(
@@ -187,11 +186,11 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
                        : "=&d" (old), "=m" (*(long *) ptr)
                        : "d" (x), "a" (ptr), "m" (*(long *) ptr)
                        : "memory", "cc");
-               x = old;
-               break;
+               return old;
 #endif /* __s390x__ */
-        }
-        return x;
+       }
+       __xchg_called_with_bad_pointer();
+       return x;
 }
 
 /*
@@ -202,9 +201,11 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
 
 #define __HAVE_ARCH_CMPXCHG 1
 
-#define cmpxchg(ptr,o,n)\
-       ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
-                                       (unsigned long)(n),sizeof(*(ptr))))
+#define cmpxchg(ptr, o, n)                                             \
+       ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o),       \
+                                       (unsigned long)(n), sizeof(*(ptr))))
+
+extern void __cmpxchg_called_with_bad_pointer(void);
 
 static inline unsigned long
 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
@@ -270,7 +271,8 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
                return prev;
 #endif /* __s390x__ */
         }
-        return old;
+       __cmpxchg_called_with_bad_pointer();
+       return old;
 }
 
 /*
@@ -353,6 +355,44 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
 
 #include <linux/irqflags.h>
 
+#include <asm-generic/cmpxchg-local.h>
+
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+                                     unsigned long old,
+                                     unsigned long new, int size)
+{
+       switch (size) {
+       case 1:
+       case 2:
+       case 4:
+#ifdef __s390x__
+       case 8:
+#endif
+               return __cmpxchg(ptr, old, new, size);
+       default:
+               return __cmpxchg_local_generic(ptr, old, new, size);
+       }
+
+       return old;
+}
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)                                       \
+       ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
+                       (unsigned long)(n), sizeof(*(ptr))))
+#ifdef __s390x__
+#define cmpxchg64_local(ptr, o, n)                                     \
+  ({                                                                   \
+       BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
+       cmpxchg_local((ptr), (o), (n));                                 \
+  })
+#else
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+#endif
+
 /*
  * Use to set psw mask except for the first byte which
  * won't be changed by this function.
@@ -386,6 +426,11 @@ extern void (*_machine_power_off)(void);
 
 #define arch_align_stack(x) (x)
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+extern psw_t sysc_restore_trace_psw;
+extern psw_t io_restore_trace_psw;
+#endif
+
 #endif /* __KERNEL__ */
 
 #endif