1 files changed, 31 insertions, 94 deletions

diff --git a/include/asm-generic/local.h b/include/asm-generic/local.h
index 16fc00360f7..9ceb03b4f46 100644
--- a/include/asm-generic/local.h
+++ b/include/asm-generic/local.h
@@ -1,31 +1,49 @@
 #ifndef _ASM_GENERIC_LOCAL_H
 #define _ASM_GENERIC_LOCAL_H
 
-#include <linux/config.h>
 #include <linux/percpu.h>
-#include <linux/hardirq.h>
+#include <linux/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.
+ */
 
-#if BITS_PER_LONG == 32
 /* Implement in terms of atomics. */
 
 /* Don't use typedef: don't want them to be mixed with atomic_t's. */
 typedef struct
 {
-	atomic_t a;
+	atomic_long_t a;
 } local_t;
 
-#define LOCAL_INIT(i)	{ ATOMIC_INIT(i) }
+#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }
+
+#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)
+#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
+#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))
 
-#define local_read(l)	((unsigned long)atomic_read(&(l)->a))
-#define local_set(l,i)	atomic_set((&(l)->a),(i))
-#define local_inc(l)	atomic_inc(&(l)->a)
-#define local_dec(l)	atomic_dec(&(l)->a)
-#define local_add(i,l)	atomic_add((i),(&(l)->a))
-#define local_sub(i,l)	atomic_sub((i),(&(l)->a))
+#define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a))
+#define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a)
+#define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a)
+#define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a))
+#define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a))
+#define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a))
+#define local_inc_return(l) atomic_long_inc_return(&(l)->a)
+
+#define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
+#define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
+#define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
+#define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
 
 /* Non-atomic variants, ie. preemption disabled and won't be touched
  * in interrupt, etc.  Some archs can optimize this case well. */
@@ -34,85 +52,4 @@ typedef struct
 #define __local_add(i,l)	local_set((l), local_read(l) + (i))
 #define __local_sub(i,l)	local_set((l), local_read(l) - (i))
 
-#else /* ... can't use atomics. */
-/* Implement in terms of three variables.
-   Another option would be to use local_irq_save/restore. */
-
-typedef struct
-{
-	/* 0 = in hardirq, 1 = in softirq, 2 = usermode. */
-	unsigned long v[3];
-} local_t;
-
-#define _LOCAL_VAR(l)	((l)->v[!in_interrupt() + !in_irq()])
-
-#define LOCAL_INIT(i)	{ { (i), 0, 0 } }
-
-static inline unsigned long local_read(local_t *l)
-{
-	return l->v[0] + l->v[1] + l->v[2];
-}
-
-static inline void local_set(local_t *l, unsigned long v)
-{
-	l->v[0] = v;
-	l->v[1] = l->v[2] = 0;
-}
-
-static inline void local_inc(local_t *l)
-{
-	preempt_disable();
-	_LOCAL_VAR(l)++;
-	preempt_enable();
-}
-
-static inline void local_dec(local_t *l)
-{
-	preempt_disable();
-	_LOCAL_VAR(l)--;
-	preempt_enable();
-}
-
-static inline void local_add(unsigned long v, local_t *l)
-{
-	preempt_disable();
-	_LOCAL_VAR(l) += v;
-	preempt_enable();
-}
-
-static inline void local_sub(unsigned long v, local_t *l)
-{
-	preempt_disable();
-	_LOCAL_VAR(l) -= v;
-	preempt_enable();
-}
-
-/* Non-atomic variants, ie. preemption disabled and won't be touched
- * in interrupt, etc.  Some archs can optimize this case well. */
-#define __local_inc(l)		((l)->v[0]++)
-#define __local_dec(l)		((l)->v[0]--)
-#define __local_add(i,l)	((l)->v[0] += (i))
-#define __local_sub(i,l)	((l)->v[0] -= (i))
-
-#endif /* Non-atomic implementation */
-
-/* Use these for per-cpu local_t variables: on some archs they are
- * much more efficient than these naive implementations.  Note they take
- * a variable (eg. mystruct.foo), not an address.
- */
-#define cpu_local_read(v)	local_read(&__get_cpu_var(v))
-#define cpu_local_set(v, i)	local_set(&__get_cpu_var(v), (i))
-#define cpu_local_inc(v)	local_inc(&__get_cpu_var(v))
-#define cpu_local_dec(v)	local_dec(&__get_cpu_var(v))
-#define cpu_local_add(i, v)	local_add((i), &__get_cpu_var(v))
-#define cpu_local_sub(i, v)	local_sub((i), &__get_cpu_var(v))
-
-/* Non-atomic increments, ie. preemption disabled and won't be touched
- * in interrupt, etc.  Some archs can optimize this case well.
- */
-#define __cpu_local_inc(v)	__local_inc(&__get_cpu_var(v))
-#define __cpu_local_dec(v)	__local_dec(&__get_cpu_var(v))
-#define __cpu_local_add(i, v)	__local_add((i), &__get_cpu_var(v))
-#define __cpu_local_sub(i, v)	__local_sub((i), &__get_cpu_var(v))
-
 #endif /* _ASM_GENERIC_LOCAL_H */