From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, mike.kravetz@oracle.com
Subject: [PATCH] mm/mremap: Document MREMAP_FIXED dependency on MREMAP_MAYMOVE
Date: Mon, 10 Jul 2017 17:02:11 +0530 [thread overview]
Message-ID: <20170710113211.31394-1-khandual@linux.vnet.ibm.com> (raw)
In the header file, just specify the dependency of MREMAP_FIXED
on MREMAP_MAYMOVE and make it explicit for the user space.
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
include/uapi/linux/mman.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h
index ade4acd..8cae3f6 100644
--- a/include/uapi/linux/mman.h
+++ b/include/uapi/linux/mman.h
@@ -3,8 +3,10 @@
#include <asm/mman.h>
-#define MREMAP_MAYMOVE 1
-#define MREMAP_FIXED 2
+#define MREMAP_MAYMOVE 1 /* VMA can move after remap and resize */
+#define MREMAP_FIXED 2 /* VMA can remap at particular address */
+
+/* NOTE: MREMAP_FIXED must be set with MREMAP_MAYMOVE, not alone */
#define OVERCOMMIT_GUESS 0
#define OVERCOMMIT_ALWAYS 1
--
1.8.5.2
--
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next reply other threads:[~2017-07-10 11:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-10 11:32 Anshuman Khandual [this message]
2017-07-10 13:41 ` [PATCH] mm/mremap: Document MREMAP_FIXED dependency on MREMAP_MAYMOVE Michal Hocko
2017-07-10 17:31 ` Mike Kravetz
2017-07-11 2:15 ` Anshuman Khandual
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