Per-CPU dynamic objects

include/smp/percpu.h

struct percpu_descriptor

struct percpu_descriptor {
    char                           *name;
    size_t                         size;
    size_t                         align;
    void                           **percpu_ptrs;
    percpu_descriptor_constructor  constructor;
};

struct percpu_descriptor referenced types:

• percpu_descriptor_constructor

type alias percpu_descriptor_constructor

typedef void (*percpu_descriptor_constructor)(void *, size_t);

Defines

PERCPU_DECLARE(__n, __type, __ctor)

#define PERCPU_DECLARE(__n, __type, __ctor)                                    \ extern __type __percpu_##__n;                                              \ static void __percpu_ctor_##__n(void *inst, size_t cpu) {                  \ if (__ctor)                                                            \ __ctor((__type *) inst, cpu);                                      \ }                                                                          \ static volatile struct percpu_descriptor __percpu_desc_##__n               \ __attribute__((section(".kernel_percpu_desc"))) = {                    \ .name = #__n,                                                      \ .size = sizeof(__type),                                            \ .align = _Alignof(__type),                                         \ .percpu_ptrs = NULL,                                               \ .constructor = __percpu_ctor_##__n,                                \ };                                                                         \ __type __percpu_##__n

PERCPU_PTR_FOR_CPU(name, cpu)

#define PERCPU_PTR_FOR_CPU(name, cpu) (__percpu_desc_##name.percpu_ptrs[cpu])

PERCPU_READ_FOR_CPU(name, cpu)

#define PERCPU_READ_FOR_CPU(name, cpu)                                         \ (*((typeof(__percpu_##name) *) PERCPU_PTR_FOR_CPU(name, cpu)))

PERCPU_PTR(name)

#define PERCPU_PTR(name) PERCPU_PTR_FOR_CPU(name, smp_core_id())

PERCPU_READ(name)

#define PERCPU_READ(name) (*((typeof(__percpu_##name) *) PERCPU_PTR(name)))

PERCPU_WRITE(name, val)

#define PERCPU_WRITE(name, val) (PERCPU_READ(name) = (val))

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