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.