#define __ARCH_I386_ATOMIC__
#include <linux/config.h>
+#include <linux/compiler.h>
+#include <asm/processor.h>
/*
* Atomic operations that C can't guarantee us. Useful for
return c;
}
+/**
+ * atomic_add_return - add and return
+ * @v: pointer of type atomic_t
+ * @i: integer value to add
+ *
+ * Atomically adds @i to @v and returns @i + @v
+ */
+static __inline__ int atomic_add_return(int i, atomic_t *v)
+{
+ int __i;
+#ifdef CONFIG_M386
+ if(unlikely(boot_cpu_data.x86==3))
+ goto no_xadd;
+#endif
+ /* Modern 486+ processor */
+ __i = i;
+ __asm__ __volatile__(
+ LOCK "xaddl %0, %1;"
+ :"=r"(i)
+ :"m"(v->counter), "0"(i));
+ return i + __i;
+
+#ifdef CONFIG_M386
+no_xadd: /* Legacy 386 processor */
+ local_irq_disable();
+ __i = atomic_read(v);
+ atomic_set(v, i + __i);
+ local_irq_enable();
+ return i + __i;
+#endif
+}
+
+static __inline__ int atomic_sub_return(int i, atomic_t *v)
+{
+ return atomic_add_return(-i,v);
+}
+
+#define atomic_inc_return(v) (atomic_add_return(1,v))
+#define atomic_dec_return(v) (atomic_sub_return(1,v))
+
/* These are x86-specific, used by some header files */
#define atomic_clear_mask(mask, addr) \
__asm__ __volatile__(LOCK "andl %0,%1" \