alloc_percpu: add align argument to __alloc_percpu.

[safe/jmp/linux-2.6] / include / linux / percpu.h

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index fac3337..1fdaee9 100644 (file)
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -8,29 +8,47 @@
 
 #include <asm/percpu.h>
 
+#ifndef PER_CPU_BASE_SECTION
+#ifdef CONFIG_SMP
+#define PER_CPU_BASE_SECTION ".data.percpu"
+#else
+#define PER_CPU_BASE_SECTION ".data"
+#endif
+#endif
+
 #ifdef CONFIG_SMP
-#define DEFINE_PER_CPU(type, name)                                     \
-       __attribute__((__section__(".data.percpu")))                    \
-       PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
 
 #ifdef MODULE
-#define SHARED_ALIGNED_SECTION ".data.percpu"
+#define PER_CPU_SHARED_ALIGNED_SECTION ""
 #else
-#define SHARED_ALIGNED_SECTION ".data.percpu.shared_aligned"
+#define PER_CPU_SHARED_ALIGNED_SECTION ".shared_aligned"
 #endif
+#define PER_CPU_FIRST_SECTION ".first"
 
-#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                      \
-       __attribute__((__section__(SHARED_ALIGNED_SECTION)))            \
-       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)
+#define PER_CPU_SHARED_ALIGNED_SECTION ""
+#define PER_CPU_FIRST_SECTION ""
+
 #endif
 
+#define DEFINE_PER_CPU_SECTION(type, name, section)                    \
+       __attribute__((__section__(PER_CPU_BASE_SECTION section)))      \
+       PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
+
+#define DEFINE_PER_CPU(type, name)                                     \
+       DEFINE_PER_CPU_SECTION(type, name, "")
+
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                      \
+       DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
+       ____cacheline_aligned_in_smp
+
+#define DEFINE_PER_CPU_PAGE_ALIGNED(type, name)                                \
+       DEFINE_PER_CPU_SECTION(type, name, ".page_aligned")
+
+#define DEFINE_PER_CPU_FIRST(type, name)                               \
+       DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
+
 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
 
@@ -63,23 +81,13 @@ struct percpu_data {
 };
 
 #define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)
-/* 
- * Use this to get to a cpu's version of the per-cpu object dynamically
- * allocated. Non-atomic access to the current CPU's version should
- * probably be combined with get_cpu()/put_cpu().
- */ 
-#define percpu_ptr(ptr, cpu)                              \
-({                                                        \
-        struct percpu_data *__p = __percpu_disguise(ptr); \
-        (__typeof__(ptr))__p->ptrs[(cpu)];               \
-})
 
 extern void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask);
 extern void percpu_free(void *__pdata);
 
 #else /* CONFIG_SMP */
 
-#define percpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
+#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
 
 static __always_inline void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
 {
@@ -100,10 +108,20 @@ static inline void percpu_free(void *__pdata)
 
 /* (legacy) interface for use without CPU hotplug handling */
 
-#define __alloc_percpu(size)   percpu_alloc_mask((size), GFP_KERNEL, \
+#define __alloc_percpu(size, align)    percpu_alloc_mask((size), GFP_KERNEL, \
                                                  cpu_possible_map)
-#define alloc_percpu(type)     (type *)__alloc_percpu(sizeof(type))
+#define alloc_percpu(type)     (type *)__alloc_percpu(sizeof(type), \
+                                                      __alignof__(type))
 #define free_percpu(ptr)       percpu_free((ptr))
-#define per_cpu_ptr(ptr, cpu)  percpu_ptr((ptr), (cpu))
+/*
+ * Use this to get to a cpu's version of the per-cpu object dynamically
+ * allocated. Non-atomic access to the current CPU's version should
+ * probably be combined with get_cpu()/put_cpu().
+ */
+#define per_cpu_ptr(ptr, cpu)                                          \
+({                                                                     \
+        struct percpu_data *__p = __percpu_disguise(ptr);              \
+        (__typeof__(ptr))__p->ptrs[(cpu)];                             \
+})
 
 #endif /* __LINUX_PERCPU_H */