linux-kernel - Re: [PATCH] mremap.2: MREMAP_DONTUNMAP to reflect to supported mappings

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Message-ID: <CADyq12yxbFB=XinWpkpJjNmoNPrXQS6mgy+aCYu8bd9hZQLakg@mail.gmail.com>
Date:   Tue, 10 May 2022 16:50:31 -0400
From:   Brian Geffon <bgeffon@...gle.com>
To:     "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
Cc:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Lokesh Gidra <lokeshgidra@...gle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Peter Xu <peterx@...hat.com>, Hugh Dickins <hughd@...gle.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andy Lutomirski <luto@...capital.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Sonny Rao <sonnyrao@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Dmitry Safonov <dima@...sta.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mremap.2: MREMAP_DONTUNMAP to reflect to supported mappings

On Fri, Mar 26, 2021 at 2:08 PM Brian Geffon <bgeffon@...gle.com> wrote:
>
> 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@...il.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?

Hi Alex,
This change has been in since 5.13 as commit
a4609387859f0281951f5e476d9f76d7fb9ab321, I apologize I forgot to
update you about the man page change after it landed.

Brian

> >
> > 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@...gle.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/