[Bug 230144] Linux emulator does not work on Ryzen / Epic processors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230144

--- Comment #12 from pete at twisted.org.uk ---
I did try applying the bits from r335702 to 11 by hand, but got part way
through and realised that it was basically a reorganisation of the brk function
instead of a bug fix - the rounding fix is, I believe, an incidental part of
the patch having looked at the commit message:

"This also addresses a minor bug in linux_brk in that we now return the
  actual (rounded up) break address, rather than the requested value."

Haven't had time to work out which is the actual change in order to try it
though. I also have no longer access to a system running CURRENT which is a bit
annoying. Does anyone more familiar with this code know which bit to change to
test it ?

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