hci_usb: do not initialize static variables to 0

[linux-2.6] / include / asm-generic / local.h

diff --git a/include/asm-generic/local.h b/include/asm-generic/local.h
index de46148..33d7d04 100644 (file)
--- a/include/asm-generic/local.h
+++ b/include/asm-generic/local.h
@@ -1,14 +1,20 @@
 #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. */
 
@@ -20,13 +26,26 @@ typedef struct
 
 #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)
 #define local_add(i,l) atomic_long_add((i),(&(l)->a))
 #define local_sub(i,l) atomic_long_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. */
 #define __local_inc(l)         local_set((l), local_read(l) + 1)
@@ -38,19 +57,19 @@ typedef struct
  * 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))
+#define cpu_local_read(l)      local_read(&__get_cpu_var(l))
+#define cpu_local_set(l, i)    local_set(&__get_cpu_var(l), (i))
+#define cpu_local_inc(l)       local_inc(&__get_cpu_var(l))
+#define cpu_local_dec(l)       local_dec(&__get_cpu_var(l))
+#define cpu_local_add(i, l)    local_add((i), &__get_cpu_var(l))
+#define cpu_local_sub(i, l)    local_sub((i), &__get_cpu_var(l))
 
 /* 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))
+#define __cpu_local_inc(l)     __local_inc(&__get_cpu_var(l))
+#define __cpu_local_dec(l)     __local_dec(&__get_cpu_var(l))
+#define __cpu_local_add(i, l)  __local_add((i), &__get_cpu_var(l))
+#define __cpu_local_sub(i, l)  __local_sub((i), &__get_cpu_var(l))
 
 #endif /* _ASM_GENERIC_LOCAL_H */