[deliverable/linux.git] / include / asm-generic / percpu.h

#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_offset
extern 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_AREA
extern 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_ */
Commit	Line	Data
	1	#ifndef _ASM_GENERIC_PERCPU_H_
	2	#define _ASM_GENERIC_PERCPU_H_
	3
	4	#include <linux/compiler.h>
	5	#include <linux/threads.h>
	6	#include <linux/percpu-defs.h>
	7
	8	#ifdef CONFIG_SMP
	9
	10	/*
	11	* per_cpu_offset() is the offset that has to be added to a
	12	* percpu variable to get to the instance for a certain processor.
	13	*
	14	* Most arches use the __per_cpu_offset array for those offsets but
	15	* some arches have their own ways of determining the offset (x86_64, s390).
	16	*/
	17	#ifndef __per_cpu_offset
	18	extern unsigned long __per_cpu_offset[NR_CPUS];
	19
	20	#define per_cpu_offset(x) (__per_cpu_offset[x])
	21	#endif
	22
	23	/*
	24	* Determine the offset for the currently active processor.
	25	* An arch may define __my_cpu_offset to provide a more effective
	26	* means of obtaining the offset to the per cpu variables of the
	27	* current processor.
	28	*/
	29	#ifndef __my_cpu_offset
	30	#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
	31	#endif
	32	#ifdef CONFIG_DEBUG_PREEMPT
	33	#define my_cpu_offset per_cpu_offset(smp_processor_id())
	34	#else
	35	#define my_cpu_offset __my_cpu_offset
	36	#endif
	37
	38	/*
	39	* Add a offset to a pointer but keep the pointer as is.
	40	*
	41	* Only S390 provides its own means of moving the pointer.
	42	*/
	43	#ifndef SHIFT_PERCPU_PTR
	44	/* Weird cast keeps both GCC and sparse happy. */
	45	#define SHIFT_PERCPU_PTR(__p, __offset) ({ \
	46	__verify_pcpu_ptr((__p)); \
	47	RELOC_HIDE((typeof((__p)) __kernel __force )(__p), (__offset)); \
	48	})
	49	#endif
	50
	51	/*
	52	* A percpu variable may point to a discarded regions. The following are
	53	* established ways to produce a usable pointer from the percpu variable
	54	* offset.
	55	*/
	56	#define per_cpu(var, cpu) \
	57	(*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)))
	58
	59	#ifndef __this_cpu_ptr
	60	#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
	61	#endif
	62	#ifdef CONFIG_DEBUG_PREEMPT
	63	#define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset)
	64	#else
	65	#define this_cpu_ptr(ptr) __this_cpu_ptr(ptr)
	66	#endif
	67
	68	#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
	69	#define __raw_get_cpu_var(var) (*__this_cpu_ptr(&(var)))
	70
	71	#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
	72	extern void setup_per_cpu_areas(void);
	73	#endif
	74
	75	#else /* ! SMP */
	76
	77	#define VERIFY_PERCPU_PTR(__p) ({ \
	78	__verify_pcpu_ptr((__p)); \
	79	(typeof((__p)) __kernel __force )(__p); \
	80	})
	81
	82	#define per_cpu(var, cpu) (*((void)(cpu), VERIFY_PERCPU_PTR(&(var))))
	83	#define __get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
	84	#define __raw_get_cpu_var(var) (*VERIFY_PERCPU_PTR(&(var)))
	85	#define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
	86	#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr)
	87
	88	#endif /* SMP */
	89
	90	#ifndef PER_CPU_BASE_SECTION
	91	#ifdef CONFIG_SMP
	92	#define PER_CPU_BASE_SECTION ".data..percpu"
	93	#else
	94	#define PER_CPU_BASE_SECTION ".data"
	95	#endif
	96	#endif
	97
	98	#ifdef CONFIG_SMP
	99
	100	#ifdef MODULE
	101	#define PER_CPU_SHARED_ALIGNED_SECTION ""
	102	#define PER_CPU_ALIGNED_SECTION ""
	103	#else
	104	#define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"
	105	#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
	106	#endif
	107	#define PER_CPU_FIRST_SECTION "..first"
	108
	109	#else
	110
	111	#define PER_CPU_SHARED_ALIGNED_SECTION ""
	112	#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
	113	#define PER_CPU_FIRST_SECTION ""
	114
	115	#endif
	116
	117	#ifndef PER_CPU_ATTRIBUTES
	118	#define PER_CPU_ATTRIBUTES
	119	#endif
	120
	121	#ifndef PER_CPU_DEF_ATTRIBUTES
	122	#define PER_CPU_DEF_ATTRIBUTES
	123	#endif
	124
	125	#endif /* _ASM_GENERIC_PERCPU_H_ */