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_sinittext & _einittext

Hi,

I am wondering why we need _sinittext and _einittext in the kernel?
What are their usages in kernel?

I understand that the code between _sinittext and _einittext (all
belong to .init.text section) are the code running during the
initiazliation, and they will be discarded later. Is that correct? If
so, during run-time, we dont have the code between _sinittext and
_einittext, right? (that means these area will be used for other
purpose?)

Many thanks.
H

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