#ifndef _ASM_GENERIC_LOCAL_H
#define _ASM_GENERIC_LOCAL_H
-#include <linux/config.h>
#include <linux/percpu.h>
#include <linux/hardirq.h>
#include <asm/atomic.h>
#include <asm/types.h>
-/* An unsigned long type for operations which are atomic for a single
- * CPU. Usually used in combination with per-cpu variables. */
+/*
+ * A signed long type for operations which are atomic for a single CPU.
+ * Usually used in combination with per-cpu variables.
+ *
+ * This is the default implementation, which uses atomic_long_t. Which is
+ * rather pointless. The whole point behind local_t is that some processors
+ * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
+ * running on this CPU. local_t allows exploitation of such capabilities.
+ */
/* Implement in terms of atomics. */
#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
-#define local_read(l) ((unsigned long)atomic_long_read(&(l)->a))
+#define local_read(l) atomic_long_read(&(l)->a)
#define local_set(l,i) atomic_long_set((&(l)->a),(i))
#define local_inc(l) atomic_long_inc(&(l)->a)
#define local_dec(l) atomic_long_dec(&(l)->a)