#ifndef _ASM_GENERIC_PERCPU_H_#define _ASM_GENERIC_PERCPU_H_ #include <linux/compiler.h>#include <linux/threads.h>#include <linux/percpu-defs.h> #ifdef CONFIG_SMP /* * per_cpu_offset() is the offset that has to be added to a * percpu variable to get to the instance for a certain processor. * * Most arches use the __per_cpu_offset array for those offsets but * some arches have their own ways of determining the offset (x86_64, s390). */#ifndef __per_cpu_offsetextern unsigned long __per_cpu_offset[NR_CPUS]; #define per_cpu_offset(x) (__per_cpu_offset[x])#endif /* * Determine the offset for the currently active processor. * An arch may define __my_cpu_offset to provide a more effective * means of obtaining the offset to the per cpu variables of the * current processor. */#ifndef __my_cpu_offset#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())#endif#ifdef CONFIG_DEBUG_PREEMPT#define my_cpu_offset per_cpu_offset(smp_processor_id())#else#define my_cpu_offset __my_cpu_offset#endif /* * Add a offset to a pointer but keep the pointer as is. * * Only S390 provides its own means of moving the pointer. */#ifndef SHIFT_PERCPU_PTR/* Weird cast keeps both GCC and sparse happy. */#define SHIFT_PERCPU_PTR(__p, __offset)	({				\	__verify_pcpu_ptr((__p));					\	RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \})#endif /* * A percpu variable may point to a discarded regions. The following are * established ways to produce a usable pointer from the percpu variable * offset. */#define per_cpu(var, cpu) \	(*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu))) #ifndef __this_cpu_ptr#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)#endif#ifdef CONFIG_DEBUG_PREEMPT#define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset)#else#define this_cpu_ptr(ptr) __this_cpu_ptr(ptr)#endif #define __get_cpu_var(var) (*this_cpu_ptr(&(var)))#define __raw_get_cpu_var(var) (*__this_cpu_ptr(&(var))) #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREAextern void setup_per_cpu_areas(void);#endif #else /* ! SMP */ #define VERIFY_PERCPU_PTR(__p) ({			\	__verify_pcpu_ptr((__p));			\	(typeof(*(__p)) __kernel __force *)(__p);	\}) #define per_cpu(var, cpu)	(*((void)(cpu), VERIFY_PERCPU_PTR(&(var))))#define __get_cpu_var(var)	(*VERIFY_PERCPU_PTR(&(var)))#define __raw_get_cpu_var(var)	(*VERIFY_PERCPU_PTR(&(var)))#define this_cpu_ptr(ptr)	per_cpu_ptr(ptr, 0)#define __this_cpu_ptr(ptr)	this_cpu_ptr(ptr) #endif	/* SMP */ #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 #ifdef MODULE#define PER_CPU_SHARED_ALIGNED_SECTION ""#define PER_CPU_ALIGNED_SECTION ""#else#define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"#define PER_CPU_ALIGNED_SECTION "..shared_aligned"#endif#define PER_CPU_FIRST_SECTION "..first" #else #define PER_CPU_SHARED_ALIGNED_SECTION ""#define PER_CPU_ALIGNED_SECTION "..shared_aligned"#define PER_CPU_FIRST_SECTION "" #endif #ifndef PER_CPU_ATTRIBUTES#define PER_CPU_ATTRIBUTES#endif #ifndef PER_CPU_DEF_ATTRIBUTES#define PER_CPU_DEF_ATTRIBUTES#endif #endif /* _ASM_GENERIC_PERCPU_H_ */