fedora core 6 1.2949 + vserver 2.2.0

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

diff --git a/include/asm-s390/percpu.h b/include/asm-s390/percpu.h
index 9addb02..9ea7f10 100644 (file)
--- a/include/asm-s390/percpu.h
+++ b/include/asm-s390/percpu.h
@@ -1,14 +1,74 @@
 #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
+
 /*
- * 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.
  */
-#undef __get_cpu_var
-#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, S390_lowcore.percpu_offset))
+#if defined(__s390x__) && defined(MODULE)
+
+#define __reloc_hide(var,offset) (*({                  \
+       extern int simple_identifier_##var(void);       \
+       unsigned long *__ptr;                           \
+       asm ( "larl %0,per_cpu__"#var"@GOTENT"          \
+           : "=a" (__ptr) : "X" (per_cpu__##var) );    \
+       (typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
+
+#else
+
+#define __reloc_hide(var, offset) (*({                         \
+       extern int simple_identifier_##var(void);               \
+       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 __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
+#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
+#define per_cpu_offset(x) (__per_cpu_offset[x])
+
+/* A macro to avoid #include hell... */
+#define percpu_modcopy(pcpudst, src, size)                     \
+do {                                                           \
+       unsigned int __i;                                       \
+       for_each_possible_cpu(__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 __raw_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__ */