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DMAR: clean up warnings about write-only variables

Description

DMAR: clean up warnings about write-only variables

For some of them, used only when KTR or KMSAN are configured, apply
__unused attribute directly.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Details

Provenance
kibAuthored on Oct 21 2021, 5:23 PM
Parents
rGbded8fa3009a: umtxq_requeue: remove write-only variable uh2
Branches
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