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Date:   Wed, 6 Mar 2019 15:38:19 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Dominique Martinet <asmadeus@codewreck.org>
Cc:     Jiri Kosina <jikos@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-api@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Jann Horn <jannh@google.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Cyril Hrubis <chrubis@suse.cz>, Daniel Gruss <daniel@gruss.cc>,
        Dave Chinner <david@fromorbit.com>,
        Kevin Easton <kevin@guarana.org>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>, Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH 0/3] mincore() and IOCB_NOWAIT adjustments
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On Thu, 7 Mar 2019 00:32:09 +0100 Dominique Martinet <asmadeus@codewreck.org> wrote:

> Andrew Morton wrote on Wed, Mar 06, 2019:
> > On Wed, 6 Mar 2019 23:48:03 +0100 (CET) Jiri Kosina <jikos@kernel.org> wrote:
> > 
> > > 3/3 is actually waiting for your decision, see
> > > 
> > > 	https://lore.kernel.org/lkml/20190212063643.GL15609@dhcp22.suse.cz/
> > 
> > I pity anyone who tried to understand this code by reading this code. 
> > Can we please get some careful commentary in there explaining what is
> > going on, and why things are thus?
> > 
> > I guess the [3/3] change makes sense, although it's unclear whether
> > anyone really needs it?  5.0 was released with 574823bfab8 ("Change
> > mincore() to count "mapped" pages rather than "cached" pages") so we'll
> > have a release cycle to somewhat determine how much impact 574823bfab8
> > has on users.  How about I queue up [3/3] and we reevaluate its
> > desirability in a couple of months?
> 
> FWIW,
> 
> 574823bfab8 has been reverted in 30bac164aca750, included in 5.0-rc4, so
> the controversial change has only been there from 5.0-rc1 to 5.0-rc3

Ah, OK, thanks, I misread.

Linus, do you have thoughts on
http://lkml.kernel.org/r/20190130124420.1834-4-vbabka@suse.cz ?