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

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Message-ID: <9c0b4b2a-3678-186a-072a-280628e5da02@gmail.com>
Date:   Thu, 25 Mar 2021 22:34:41 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     Brian Geffon <bgeffon@...gle.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>,
        linux-kernel@...r.kernel.org, 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

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@...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/