patch-2_6_7-vs1_9_1_12

[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..7adef69 100644 (file)
--- a/include/asm-s390/percpu.h
+++ b/include/asm-s390/percpu.h
@@ -5,10 +5,26 @@
 #include <asm/lowcore.h>
 
 /*
- * 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
+ * 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
+ * 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) \
+  (*({ 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])
+#else
 #undef __get_cpu_var
 #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, S390_lowcore.percpu_offset))
+#endif
 
 #endif /* __ARCH_S390_PERCPU__ */