where is __percpu_seg initialized?

[落痕]

Hi all:
I knew the kernel implement the per-cpu variable via __percpu_seg. For example on x86 architecture, it's defined as:


#ifdef CONFIG_X86_64
#define __percpu_seg		gs
#define __percpu_mov_op		movq
#else
#define __percpu_seg		fs
#define __percpu_mov_op		movl
#endif 
    
But I'm curious where __percpu_seg is initialized?? I fail to find the relative code. Thanks.
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