file arch/x86...current.h, definition of per_cpu objects

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As I understand, the macro current in x86 expands to a function
returning the value in current_task, which is defind for each cpu (is
it?), and the segment register %fs points to a descriptor with a base
address of the offset per-cpu, for (this? all?) per-cpu objects..

So, basically we are reading the object current_task + the offset
contained in the base of the percpu (27th in the GDT) segment..

Could somebody elaborate? thanks

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