[Bug 165622] [ndis][panic][patch] Unregistered use of FPU in kernel on amd64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=165622

--- Comment #12 from commit-hook at freebsd.org ---
A commit references this bug:

Author: gonzo
Date: Tue Jan 22 03:53:43 UTC 2019
New revision: 343298
URL: https://svnweb.freebsd.org/changeset/base/343298

Log:
  [ndis] Fix unregistered use of FPU by NDIS in kernel on amd64

  amd64 miniport drivers are allowed to use FPU which triggers "Unregistered
use
  of FPU in kernel" panic.

  Wrap all variants of MSCALL with fpu_kern_enter/fpu_kern_leave.  To reduce
  amount of allocations/deallocations done via
  fpu_kern_alloc_ctx/fpu_kern_free_ctx maintain cache of fpu_kern_ctx elements.

  Based on the patch by Paul B Mahol

  PR:           165622
  Submitted by: Vlad Movchan <vladislav.movchan at gmail.com>
  MFC after:    1 month

Changes:
  head/sys/compat/ndis/kern_windrv.c
  head/sys/compat/ndis/pe_var.h

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