percpu.h

xen 3.2.2 源码

#ifndef __X86_PERCPU_H__
#define __X86_PERCPU_H__

#define PERCPU_SHIFT 12
#define PERCPU_SIZE  (1UL << PERCPU_SHIFT)

/* 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, ((unsigned int)(cpu))<<PERCPU_SHIFT))
#define __get_cpu_var(var) \
    (per_cpu(var, smp_processor_id()))

#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

#endif /* __X86_PERCPU_H__ */