Question: use of FS, GS segment registers in Linux

[Pengfei Yuan]

Hi,

What is the use of FS, GS segment registers in kernel and user mode,
on x86 and x86-64?
Where can I find the related kernel (definition/setup) code?

I have read the code in arch/x86/include/asm/segment.h, but still a
little confused.

Regards,

Yuan, Pengfei
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