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

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

#define __GENERIC_PER_CPU
#ifdef CONFIG_SMP

extern unsigned long __per_cpu_offset[NR_CPUS];

#define per_cpu_offset(x) (__per_cpu_offset[x])

/* Separate out the type, so (int[3], foo) works. */
#define DEFINE_PER_CPU(type, name) \
    __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)		\
    __attribute__((__section__(".data.percpu.shared_aligned"))) \
    __typeof__(type) per_cpu__##name				\
    ____cacheline_aligned_in_smp

/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*({				\
	extern int simple_identifier_##var(void);	\
	RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())

/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size)			\
do {								\
	unsigned int __i;					\
	for_each_possible_cpu(__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 DEFINE_PER_CPU_SHARED_ALIGNED(type, name)	\
    DEFINE_PER_CPU(type, name)

#define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var)			per_cpu__##var
#define __raw_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>
ae1ee11b	4	#include <linux/threads.h>
1da177e4 LT	5
	6	#define __GENERIC_PER_CPU
	7	#ifdef CONFIG_SMP
	8
	9	extern unsigned long __per_cpu_offset[NR_CPUS];
	10
a875a69f IM	11	#define per_cpu_offset(x) (__per_cpu_offset[x])
a875a69f IM	12
1da177e4 LT	13	/* Separate out the type, so (int[3], foo) works. */
	14	#define DEFINE_PER_CPU(type, name) \
	15	__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
	16
5fb7dc37 FY	17	#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
	18	__attribute__((__section__(".data.percpu.shared_aligned"))) \
	19	__typeof__(type) per_cpu__##name \
	20	____cacheline_aligned_in_smp
	21
1da177e4	22	/* var is in discarded region: offset to particular copy we want */
632bbfee	23	#define per_cpu(var, cpu) (*({ \
a666ecfb	24	extern int simple_identifier_##var(void); \
632bbfee	25	RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
1da177e4	26	#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
bfe5d834	27	#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())
1da177e4 LT	28
	29	/* A macro to avoid #include hell... */
	30	#define percpu_modcopy(pcpudst, src, size) \
	31	do { \
	32	unsigned int __i; \
0a945022	33	for_each_possible_cpu(__i) \
394e3902 AM	34	memcpy((pcpudst)+__per_cpu_offset[__i], \
394e3902 AM	35	(src), (size)); \
1da177e4 LT	36	} while (0)
	37	#else /* ! SMP */
	38
	39	#define DEFINE_PER_CPU(type, name) \
	40	__typeof__(type) per_cpu__##name
	41
5fb7dc37 FY	42	#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
	43	DEFINE_PER_CPU(type, name)
	44
11c80c83	45	#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
1da177e4	46	#define __get_cpu_var(var) per_cpu__##var
bfe5d834	47	#define __raw_get_cpu_var(var) per_cpu__##var
1da177e4 LT	48
	49	#endif /* SMP */
	50
	51	#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
	52
	53	#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
	54	#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
	55
	56	#endif /* _ASM_GENERIC_PERCPU_H_ */