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Date:      Tue, 3 Dec 2019 13:30:20 -0800
From:      Ryan Libby <rlibby@freebsd.org>
To:        Ian Lepore <ian@freebsd.org>
Cc:        Gleb Smirnoff <glebius@freebsd.org>, src-committers <src-committers@freebsd.org>,  svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r355137 - head/sys/vm
Message-ID:  <CAHgpiFy=GVvVPLO4eFEoQM=O2qxdm%2Bh%2BV%2BeCREYVTR%2BLn3HjTg@mail.gmail.com>
In-Reply-To: <a7ee1944d25babe88a4600731bb231ede35e76e1.camel@freebsd.org>
References:  <201911271949.xARJnuFl084178@repo.freebsd.org> <20191203204313.GB2706@FreeBSD.org> <CAHgpiFzjhvAHnbqcynpAc4d%2BewAgrGAcn-V9zyqHeb19YuH7kg@mail.gmail.com> <a7ee1944d25babe88a4600731bb231ede35e76e1.camel@freebsd.org>

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On Tue, Dec 3, 2019 at 1:12 PM Ian Lepore <ian@freebsd.org> wrote:
>
> On Tue, 2019-12-03 at 12:59 -0800, Ryan Libby wrote:
> > > +        * XXX UMA_ZONE_OFFPAGE.
>
> All over freebsd we have cryptic XXX comments that have no meaning to
> anyone except whoever wrote them (and, I suspect, no meaning to those
> people either after a couple months have elapsed).
>
> To the degree that XXX represents "possible trouble here" and/or "more
> work to do here", I would argue that any placement of a new XXX
> requires at least a sentence (and probably more like a paragraph) to
> describe why it's there.
>
> -- Ian

Yes, I agree it is cryptic.  This specific XXX is discussed in the
review and is a cookie crumb for planned future work:
https://reviews.freebsd.org/D20722?id=64944#inline-140550

In this case the problem is pre-existing and the comment calls it out so
that we don't miss it in a coming cleanup.  I wrote the block comment
directly above so that it would make sense when the correct flag check
is eventually inserted.

Ryan


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