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From:   Brian Geffon <bgeffon@google.com>
Date:   Fri, 26 Mar 2021 11:08:40 -0700
Message-ID: <CADyq12wc9=dt5V=YEr+U9JLP1VObG_UOsGaQUDH88WAZH-4Txg@mail.gmail.com>
Subject: Re: [PATCH] mremap.2: MREMAP_DONTUNMAP to reflect to supported mappings
To:     "Alejandro Colomar (man-pages)" <alx.manpages@gmail.com>
Cc:     Axel Rasmussen <axelrasmussen@google.com>,
        Lokesh Gidra <lokeshgidra@google.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Peter Xu <peterx@redhat.com>, Hugh Dickins <hughd@google.com>,
        "Michael S . Tsirkin" <mst@redhat.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Andy Lutomirski <luto@amacapital.net>,
        Vlastimil Babka <vbabka@suse.cz>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Sonny Rao <sonnyrao@google.com>,
        Minchan Kim <minchan@kernel.org>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Dmitry Safonov <dima@arista.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>
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Hi Alex,
It has not landed yet, it's currently in Andrew's mm tree. I can reach
out again when it makes it into Linus' tree.

Brian


On Thu, Mar 25, 2021 at 2:34 PM Alejandro Colomar (man-pages)
<alx.manpages@gmail.com> wrote:
>
> Hello Brian,
>
> Is this already merged in Linux?  I guess not, as I've seen a patch of
> yous for the kernel, right?
>
> Thanks,
>
> Alex
>
> On 3/23/21 7:25 PM, Brian Geffon wrote:
> > mremap(2) now supports MREMAP_DONTUNMAP with mapping types other
> > than private anonymous.
> >
> > Signed-off-by: Brian Geffon <bgeffon@google.com>
> > ---
> >   man2/mremap.2 | 13 ++-----------
> >   1 file changed, 2 insertions(+), 11 deletions(-)
> >
> > diff --git a/man2/mremap.2 b/man2/mremap.2
> > index 3ed0c0c0a..72acbc111 100644
> > --- a/man2/mremap.2
> > +++ b/man2/mremap.2
> > @@ -118,16 +118,6 @@ This flag, which must be used in conjunction with
> >   remaps a mapping to a new address but does not unmap the mapping at
> >   .IR old_address .
> >   .IP
> > -The
> > -.B MREMAP_DONTUNMAP
> > -flag can be used only with private anonymous mappings
> > -(see the description of
> > -.BR MAP_PRIVATE
> > -and
> > -.BR MAP_ANONYMOUS
> > -in
> > -.BR mmap (2)).
> > -.IP
> >   After completion,
> >   any access to the range specified by
> >   .IR old_address
> > @@ -227,7 +217,8 @@ was specified, but one or more pages in the range specified by
> >   .IR old_address
> >   and
> >   .IR old_size
> > -were not private anonymous;
> > +were part of a special mapping or the mapping is one that
> > +does not support merging or expanding;
> >   .IP *
> >   .B MREMAP_DONTUNMAP
> >   was specified and
> >
>
> --
> Alejandro Colomar
> Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
> http://www.alejandro-colomar.es/