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Fix regression in r313898 on i386.

Description

Fix regression in r313898 on i386.

Use large enough type for calculation of mtrr physmask. Typical
cpu_maxphyaddr is 36 or larger.

Reported and tested by: sbruno
Sponsored by: The FreeBSD Foundation
MFC after: 13 days

Details

Provenance
kibAuthored on
Parents
rS313933: Microoptimize amd64/pmap.c pmap_protect_pde().
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