percpu.h
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#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__
#include <linux/compiler.h>
#include <asm/lowcore.h>
/*
* 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 SHIFT_PERCPU_PTR(ptr,offset) (({ \
extern int simple_identifier_##var(void); \
unsigned long *__ptr; \
asm ( "larl %0, %1@GOTENT" \
: "=a" (__ptr) : "X" (ptr) ); \
(typeof(ptr))((*__ptr) + (offset)); }))
#else
#define SHIFT_PERCPU_PTR(ptr, offset) (({ \
extern int simple_identifier_##var(void); \
unsigned long __ptr; \
asm ( "" : "=a" (__ptr) : "0" (ptr) ); \
(typeof(ptr)) (__ptr + (offset)); }))
#endif
#define __my_cpu_offset S390_lowcore.percpu_offset
#include <asm-generic/percpu.h>
#endif /* __ARCH_S390_PERCPU__ */