|
|
@@ -0,0 +1,96 @@
|
|
|
+#ifndef _ASM_GENERIC_LOCAL64_H
|
|
|
+#define _ASM_GENERIC_LOCAL64_H
|
|
|
+
|
|
|
+#include <linux/percpu.h>
|
|
|
+#include <asm/types.h>
|
|
|
+
|
|
|
+/*
|
|
|
+ * 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 atomic64_t. Which is
|
|
|
+ * rather pointless. The whole point behind local64_t is that some processors
|
|
|
+ * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
|
|
|
+ * running on this CPU. local64_t allows exploitation of such capabilities.
|
|
|
+ */
|
|
|
+
|
|
|
+/* Implement in terms of atomics. */
|
|
|
+
|
|
|
+#if BITS_PER_LONG == 64
|
|
|
+
|
|
|
+#include <asm/local.h>
|
|
|
+
|
|
|
+typedef struct {
|
|
|
+ local_t a;
|
|
|
+} local64_t;
|
|
|
+
|
|
|
+#define LOCAL64_INIT(i) { LOCAL_INIT(i) }
|
|
|
+
|
|
|
+#define local64_read(l) local_read(&(l)->a)
|
|
|
+#define local64_set(l,i) local_set((&(l)->a),(i))
|
|
|
+#define local64_inc(l) local_inc(&(l)->a)
|
|
|
+#define local64_dec(l) local_dec(&(l)->a)
|
|
|
+#define local64_add(i,l) local_add((i),(&(l)->a))
|
|
|
+#define local64_sub(i,l) local_sub((i),(&(l)->a))
|
|
|
+
|
|
|
+#define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a))
|
|
|
+#define local64_dec_and_test(l) local_dec_and_test(&(l)->a)
|
|
|
+#define local64_inc_and_test(l) local_inc_and_test(&(l)->a)
|
|
|
+#define local64_add_negative(i, l) local_add_negative((i), (&(l)->a))
|
|
|
+#define local64_add_return(i, l) local_add_return((i), (&(l)->a))
|
|
|
+#define local64_sub_return(i, l) local_sub_return((i), (&(l)->a))
|
|
|
+#define local64_inc_return(l) local_inc_return(&(l)->a)
|
|
|
+
|
|
|
+#define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n))
|
|
|
+#define local64_xchg(l, n) local_xchg((&(l)->a), (n))
|
|
|
+#define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u))
|
|
|
+#define local64_inc_not_zero(l) local_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. */
|
|
|
+#define __local64_inc(l) local64_set((l), local64_read(l) + 1)
|
|
|
+#define __local64_dec(l) local64_set((l), local64_read(l) - 1)
|
|
|
+#define __local64_add(i,l) local64_set((l), local64_read(l) + (i))
|
|
|
+#define __local64_sub(i,l) local64_set((l), local64_read(l) - (i))
|
|
|
+
|
|
|
+#else /* BITS_PER_LONG != 64 */
|
|
|
+
|
|
|
+#include <asm/atomic.h>
|
|
|
+
|
|
|
+/* Don't use typedef: don't want them to be mixed with atomic_t's. */
|
|
|
+typedef struct {
|
|
|
+ atomic64_t a;
|
|
|
+} local64_t;
|
|
|
+
|
|
|
+#define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) }
|
|
|
+
|
|
|
+#define local64_read(l) atomic64_read(&(l)->a)
|
|
|
+#define local64_set(l,i) atomic64_set((&(l)->a),(i))
|
|
|
+#define local64_inc(l) atomic64_inc(&(l)->a)
|
|
|
+#define local64_dec(l) atomic64_dec(&(l)->a)
|
|
|
+#define local64_add(i,l) atomic64_add((i),(&(l)->a))
|
|
|
+#define local64_sub(i,l) atomic64_sub((i),(&(l)->a))
|
|
|
+
|
|
|
+#define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a))
|
|
|
+#define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a)
|
|
|
+#define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a)
|
|
|
+#define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a))
|
|
|
+#define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a))
|
|
|
+#define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a))
|
|
|
+#define local64_inc_return(l) atomic64_inc_return(&(l)->a)
|
|
|
+
|
|
|
+#define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n))
|
|
|
+#define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n))
|
|
|
+#define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u))
|
|
|
+#define local64_inc_not_zero(l) atomic64_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. */
|
|
|
+#define __local64_inc(l) local64_set((l), local64_read(l) + 1)
|
|
|
+#define __local64_dec(l) local64_set((l), local64_read(l) - 1)
|
|
|
+#define __local64_add(i,l) local64_set((l), local64_read(l) + (i))
|
|
|
+#define __local64_sub(i,l) local64_set((l), local64_read(l) - (i))
|
|
|
+
|
|
|
+#endif /* BITS_PER_LONG != 64 */
|
|
|
+
|
|
|
+#endif /* _ASM_GENERIC_LOCAL64_H */
|
Peter Zijlstra