1 files changed, 21 insertions, 1 deletions

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 926adaae0f96..1ac969724bb2 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -9,6 +9,26 @@
 
 #include <asm/percpu.h>
 
+#ifdef CONFIG_SMP
+#define DEFINE_PER_CPU(type, name)                                      \
+        __attribute__((__section__(".data.percpu")))                    \
+        PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
+
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                       \
+        __attribute__((__section__(".data.percpu.shared_aligned")))     \
+        PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name             \
+        ____cacheline_aligned_in_smp
+#else
+#define DEFINE_PER_CPU(type, name)                                      \
+        PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
+
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                     \
+        DEFINE_PER_CPU(type, name)
+#endif
+
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+
 /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
 #ifndef PERCPU_ENOUGH_ROOM
 #ifdef CONFIG_MODULES
@@ -34,7 +54,7 @@
 #ifdef CONFIG_SMP
 
 struct percpu_data {
-        void *ptrs[NR_CPUS];
+        void *ptrs[1];
 };
 
 #define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)