VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

[linux-2.6.git] / include / asm-s390 / percpu.h

diff --git a/include/asm-s390/percpu.h b/include/asm-s390/percpu.h
index 7adef69..123fcac 100644 (file)
--- a/include/asm-s390/percpu.h
+++ b/include/asm-s390/percpu.h
@@ -1,30 +1,70 @@
 #ifndef __ARCH_S390_PERCPU__
 #define __ARCH_S390_PERCPU__
 
-#include <asm-generic/percpu.h>
+#include <linux/compiler.h>
 #include <asm/lowcore.h>
 
+#define __GENERIC_PER_CPU
+
 /*
- * For builtin kernel code s390 uses the generic implementation for
- * per cpu data, with the exception that the offset of the cpu local
- * data area is cached in the cpu's lowcore memory
+ * s390 uses its own implementation for per cpu data, the offset of
+ * the cpu local data area is cached in the cpu's lowcore memory.
  * For 64 bit module code s390 forces the use of a GOT slot for the
  * address of the per cpu variable. This is needed because the module
  * may be more than 4G above the per cpu area.
  */
 #if defined(__s390x__) && defined(MODULE)
-#define __get_got_cpu_var(var,offset) \
+
+#define __reloc_hide(var,offset) \
   (*({ unsigned long *__ptr; \
-       asm ( "larl %0,per_cpu__"#var"@GOTENT" : "=a" (__ptr) ); \
-       ((typeof(&per_cpu__##var))((*__ptr) + offset)); \
-    }))
-#undef __get_cpu_var
-#define __get_cpu_var(var) __get_got_cpu_var(var,S390_lowcore.percpu_offset)
-#undef per_cpu
-#define per_cpu(var,cpu) __get_got_cpu_var(var,__per_cpu_offset[cpu])
+       asm ( "larl %0,per_cpu__"#var"@GOTENT" \
+             : "=a" (__ptr) : "X" (per_cpu__##var) ); \
+       (typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
+
 #else
-#undef __get_cpu_var
-#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, S390_lowcore.percpu_offset))
+
+#define __reloc_hide(var, offset) \
+  (*({ unsigned long __ptr; \
+       asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
+       (typeof(&per_cpu__##var)) (__ptr + (offset)); }))
+
 #endif
 
+#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
+
+#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
+#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
+
+/* 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 __get_cpu_var(var) __reloc_hide(var,0)
+#define per_cpu(var,cpu) __reloc_hide(var,0)
+
+#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 /* __ARCH_S390_PERCPU__ */