locking/qspinlock: Move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h

Move the __ARCH_SPIN_LOCK_UNLOCKED definition from qspinlock.h into
qspinlock_types.h.

The definition of __ARCH_SPIN_LOCK_UNLOCKED comes from the build arch's
include files; but on x86 when CONFIG_QUEUED_SPINLOCKS=y, it just
it's defined in asm-generic/qspinlock.h.  In most cases, this doesn't
matter because linux/spinlock.h includes asm/spinlock.h, which for x86
includes asm-generic/qspinlock.h.  However, any code that only includes
linux/mutex.h will break, because it only includes asm/spinlock_types.h.

For example, this breaks systemtap, which only includes mutex.h.

Signed-off-by: Dan Streetman <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Waiman Long <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dan Streetman <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

include/asm-generic/qspinlock.h

@@ -119,11 +119,6 @@ static __always_inline bool virt_spin_lock(struct qspinlock *lock)
 }
 #endif
 
-/*
- * Initializier
- */
-#define	__ARCH_SPIN_LOCK_UNLOCKED	{ ATOMIC_INIT(0) }
-
 /*
  * Remapping spinlock architecture specific functions to the corresponding
  * queued spinlock functions.

include/asm-generic/qspinlock_types.h

@@ -32,6 +32,11 @@ typedef struct qspinlock {
 	atomic_t	val;
 } arch_spinlock_t;
 
+/*
+ * Initializier
+ */
+#define	__ARCH_SPIN_LOCK_UNLOCKED	{ ATOMIC_INIT(0) }
+
 /*
  * Bitfields in the atomic value:
  *