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LinuxKPI: add read_poll_timeout()

Description

LinuxKPI: add read_poll_timeout()

Add an implementation of read_poll_timeout() and the atomic variant
which I did at some point last year for rtw88 and now updated based
on feedback.

MFC after: 10 days
Reviewed by: hsealsky
Differential Revision: https://reviews.freebsd.org/D30980

Details

Provenance
bzAuthored on Jul 1 2021, 1:29 PM
Differential Revision
D30980: LinuxKPI: add read_poll_timeout()
Parents
R10:ac959cf54421: xen: introduce xen_has_percpu_evtchn()
Branches
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