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Privileged vs Non Privileged mode

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Switching from privileged to non-privileged mode requires a non-privileged instruction according to this link

https://gateoverflow.in/706/gate2001-1-13

But below has been quoted in this link

https://gateoverflow.in/445/gate2008-34

http://www.cs.rochester.edu/courses/252/spring2014/notes/08_exceptions

Transitions from kernel to user mode are performed explicitly by the operating system, generally at the end of an interrupt handler or kernel call, using a privileged RFE (return from exception) instruction.

Kindly clear this ... Any sort of help is appreciated ... Thanks :)

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