All of lore.kernel.org
 help / color / mirror / Atom feed
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

WARNING: multiple messages have this Message-ID (diff)
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

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

             reply	other threads:[~2017-07-10 11:32 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-10 11:32 Anshuman Khandual [this message]
2017-07-10 11:32 ` [PATCH] mm/mremap: Document MREMAP_FIXED dependency on MREMAP_MAYMOVE Anshuman Khandual
2017-07-10 13:41 ` Michal Hocko
2017-07-10 13:41   ` Michal Hocko
2017-07-10 17:31   ` Mike Kravetz
2017-07-10 17:31     ` Mike Kravetz
2017-07-11  2:15     ` Anshuman Khandual
2017-07-11  2:15       ` Anshuman Khandual

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170710113211.31394-1-khandual@linux.vnet.ibm.com \
    --to=khandual@linux.vnet.ibm.com \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mike.kravetz@oracle.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.