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struct percpu_data {
void *ptrs[NR_CPUS];
};
#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)
/*
* Use this to get to a cpu's version of the per-cpu object dynamically
* allocated. Non-atomic access to the current CPU's version should
* probably be combined with get_cpu()/put_cpu().
*/
#define percpu_ptr(ptr, cpu) \
({ \
struct percpu_data *__p = __percpu_disguise(ptr); \
(__typeof__(ptr))__p->ptrs[(cpu)]; \
})
求问#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)这个定义怎么回事? |
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