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--- a/compat/Makefile
+++ b/compat/Makefile
@@ -34,3 +34,8 @@ compat-$(CONFIG_COMPAT_KERNEL_2_6_39) +=
compat-2.6.39.o \
kstrtox.o
+ifndef CONFIG_64BIT
+ifndef CONFIG_GENERIC_ATOMIC64
+ compat-y += compat_atomic.o
+endif
+endif
--- a/include/linux/compat-2.6.31.h
+++ b/include/linux/compat-2.6.31.h
@@ -199,6 +199,20 @@ void compat_synchronize_threaded_irq(str
#define list_entry_rcu(ptr, type, member) \
container_of(rcu_dereference(ptr), type, member)
+#ifndef CONFIG_64BIT
+
+typedef struct {
+ long long counter;
+} atomic64_t;
+
+extern long long atomic64_read(const atomic64_t *v);
+extern long long atomic64_add_return(long long a, atomic64_t *v);
+
+#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
+
+#endif
+
+
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)) */
#endif /* LINUX_26_31_COMPAT_H */
--- /dev/null
+++ b/compat/compat_atomic.c
@@ -0,0 +1,29 @@
+#include <linux/spinlock.h>
+#include <linux/module.h>
+
+static DEFINE_SPINLOCK(lock);
+
+long long atomic64_read(const atomic64_t *v)
+{
+ unsigned long flags;
+ long long val;
+
+ spin_lock_irqsave(&lock, flags);
+ val = v->counter;
+ spin_unlock_irqrestore(&lock, flags);
+ return val;
+}
+EXPORT_SYMBOL(atomic64_read);
+
+long long atomic64_add_return(long long a, atomic64_t *v)
+{
+ unsigned long flags;
+ long long val;
+
+ spin_lock_irqsave(&lock, flags);
+ val = v->counter += a;
+ spin_unlock_irqrestore(&lock, flags);
+ return val;
+}
+EXPORT_SYMBOL(atomic64_add_return);
+
--- a/include/linux/compat-3.1.h
+++ b/include/linux/compat-3.1.h
@@ -24,6 +24,18 @@
#define genl_dump_check_consistent(...) do {} while(0)
+/*
+ * In many versions, several architectures do not seem to include an
+ * atomic64_t implementation, and do not include the software emulation from
+ * asm-generic/atomic64_t.
+ * Detect and handle this here.
+ */
+#include <asm/atomic.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)) && !defined(ATOMIC64_INIT)
+#include <asm-generic/atomic64.h>
+#endif
+
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0)) */
#endif /* LINUX_3_1_COMPAT_H */
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