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

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Date:   Tue, 23 Mar 2021 11:25:20 -0700
From:   Brian Geffon <bgeffon@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
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>,
        Brian Geffon <bgeffon@...gle.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>,
        Alejandro Colomar <alx.manpages@...il.com>
Subject: [PATCH] mremap.2: MREMAP_DONTUNMAP to reflect to supported mappings

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
-- 
2.31.0.rc2.261.g7f71774620-goog