x86/cmpxchg: add a locked add() helper

Mostly to remove some conditional code in spinlock.h.
Signed-off-by: NJeremy Fitzhardinge <jeremy@goop.org>

arch/x86/include/asm/cmpxchg.h

@@ -14,6 +14,8 @@ extern void __cmpxchg_wrong_size(void)
 	__compiletime_error("Bad argument size for cmpxchg");
 extern void __xadd_wrong_size(void)
 	__compiletime_error("Bad argument size for xadd");
+extern void __add_wrong_size(void)
+	__compiletime_error("Bad argument size for add");
 
 /*
  * Constants for operation sizes. On 32-bit, the 64-bit size it set to
@@ -207,4 +209,44 @@ extern void __xadd_wrong_size(void)
 #define xadd_sync(ptr, inc)	__xadd((ptr), (inc), "lock; ")
 #define xadd_local(ptr, inc)	__xadd((ptr), (inc), "")
 
+#define __add(ptr, inc, lock)						\
+	({								\
+	        __typeof__ (*(ptr)) __ret = (inc);			\
+		switch (sizeof(*(ptr))) {				\
+		case __X86_CASE_B:					\
+			asm volatile (lock "addb %b1, %0\n"		\
+				      : "+m" (*(ptr)) : "ri" (inc)	\
+				      : "memory", "cc");		\
+			break;						\
+		case __X86_CASE_W:					\
+			asm volatile (lock "addw %w1, %0\n"		\
+				      : "+m" (*(ptr)) : "ri" (inc)	\
+				      : "memory", "cc");		\
+			break;						\
+		case __X86_CASE_L:					\
+			asm volatile (lock "addl %1, %0\n"		\
+				      : "+m" (*(ptr)) : "ri" (inc)	\
+				      : "memory", "cc");		\
+			break;						\
+		case __X86_CASE_Q:					\
+			asm volatile (lock "addq %1, %0\n"		\
+				      : "+m" (*(ptr)) : "ri" (inc)	\
+				      : "memory", "cc");		\
+			break;						\
+		default:						\
+			__add_wrong_size();				\
+		}							\
+		__ret;							\
+	})
+
+/*
+ * add_*() adds "inc" to "*ptr"
+ *
+ * __add() takes a lock prefix
+ * add_smp() is locked when multiple CPUs are online
+ * add_sync() is always locked
+ */
+#define add_smp(ptr, inc)	__add((ptr), (inc), LOCK_PREFIX)
+#define add_sync(ptr, inc)	__add((ptr), (inc), "lock; ")
+
 #endif	/* ASM_X86_CMPXCHG_H */

arch/x86/include/asm/spinlock.h

@@ -79,23 +79,10 @@ static __always_inline int __ticket_spin_trylock(arch_spinlock_t *lock)
 	return cmpxchg(&lock->head_tail, old.head_tail, new.head_tail) == old.head_tail;
 }
 
-#if (NR_CPUS < 256)
 static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
 {
-	asm volatile(UNLOCK_LOCK_PREFIX "incb %0"
-		     : "+m" (lock->head_tail)
-		     :
-		     : "memory", "cc");
+	__add(&lock->tickets.head, 1, UNLOCK_LOCK_PREFIX);
 }
-#else
-static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
-{
-	asm volatile(UNLOCK_LOCK_PREFIX "incw %0"
-		     : "+m" (lock->head_tail)
-		     :
-		     : "memory", "cc");
-}
-#endif
 
 static inline int __ticket_spin_is_locked(arch_spinlock_t *lock)
 {