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Subject[PATCH] mm/mremap: Document MREMAP_FIXED dependency on MREMAP_MAYMOVE
Date
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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