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2021-12-07T18:20:09.294042Z
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i386: take pcb and fpu area into account in GET_STACK_USAGE

On this platform, the pcb and FPU save area are allocated from the top
of each kernel stack, so they should be excluded from the calculation of
the total and used stack sizes.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32581

(cherry picked from commit 8bc792b3845ecf64145fda7964a7b5cc54dea777)

Git Hash:   2bb54c1646c7f28460d18a21289587523ac6aef9
Git Author: mhorne@FreeBSD.org
END