1 files changed, 42 insertions, 0 deletions

diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
new file mode 100644
index 000000000000..3b709b84934f
--- /dev/null
+++ b/include/asm-generic/percpu.h
@@ -0,0 +1,42 @@
+#ifndef _ASM_GENERIC_PERCPU_H_
+#define _ASM_GENERIC_PERCPU_H_
+#include <linux/compiler.h>
+
+#define __GENERIC_PER_CPU
+#ifdef CONFIG_SMP
+
+extern unsigned long __per_cpu_offset[NR_CPUS];
+
+/* Separate out the type, so (int[3], foo) works. */
+#define DEFINE_PER_CPU(type, name) \
+    __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
+
+/* var is in discarded region: offset to particular copy we want */
+#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
+#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
+
+/* A macro to avoid #include hell... */
+#define percpu_modcopy(pcpudst, src, size)                      \
+do {                                                            \
+        unsigned int __i;                                       \
+        for (__i = 0; __i < NR_CPUS; __i++)                     \
+                if (cpu_possible(__i))                          \
+                        memcpy((pcpudst)+__per_cpu_offset[__i], \
+                               (src), (size));                  \
+} while (0)
+#else /* ! SMP */
+
+#define DEFINE_PER_CPU(type, name) \
+    __typeof__(type) per_cpu__##name
+
+#define per_cpu(var, cpu)                       (*((void)cpu, &per_cpu__##var))
+#define __get_cpu_var(var)                      per_cpu__##var
+
+#endif  /* SMP */
+
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
+
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+
+#endif /* _ASM_GENERIC_PERCPU_H_ */