[mirror_ubuntu-zesty-kernel.git] / include / asm-generic / percpu.h

#ifndef _ASM_GENERIC_PERCPU_H_
#define _ASM_GENERIC_PERCPU_H_
#include <linux/compiler.h>

#define __GENERIC_PER_CPU
#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

/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
#define __get_cpu_var(var) per_cpu(var, smp_processor_id())

/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size)			\
do {								\
	unsigned int __i;					\
	for (__i = 0; __i < NR_CPUS; __i++)			\
		if (cpu_possible(__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 per_cpu(var, cpu)			(*((void)cpu, &per_cpu__##var))
#define __get_cpu_var(var)			per_cpu__##var

#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 /* _ASM_GENERIC_PERCPU_H_ */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_GENERIC_PERCPU_H_
	2	#define _ASM_GENERIC_PERCPU_H_
	3	#include <linux/compiler.h>
	4
	5	#define __GENERIC_PER_CPU
	6	#ifdef CONFIG_SMP
	7
	8	extern unsigned long __per_cpu_offset[NR_CPUS];
	9
	10	/* Separate out the type, so (int[3], foo) works. */
	11	#define DEFINE_PER_CPU(type, name) \
	12	__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
	13
	14	/* var is in discarded region: offset to particular copy we want */
	15	#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
	16	#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
	17
	18	/* A macro to avoid #include hell... */
	19	#define percpu_modcopy(pcpudst, src, size) \
	20	do { \
	21	unsigned int __i; \
	22	for (__i = 0; __i < NR_CPUS; __i++) \
	23	if (cpu_possible(__i)) \
	24	memcpy((pcpudst)+__per_cpu_offset[__i], \
	25	(src), (size)); \
	26	} while (0)
	27	#else /* ! SMP */
	28
	29	#define DEFINE_PER_CPU(type, name) \
	30	__typeof__(type) per_cpu__##name
	31
	32	#define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var))
	33	#define __get_cpu_var(var) per_cpu__##var
	34
	35	#endif /* SMP */
	36
	37	#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
	38
	39	#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
	40	#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
	41
	42	#endif /* _ASM_GENERIC_PERCPU_H_ */