From: Dean Nelson <dcn@sgi.com>
To: akpm@linux-foundation.org
Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, tony.luck@intel.com, jes@sgi.com
Subject: [PATCH 3/4] add new lock ordering rule to mm/filemap.c
Date: Mon, 27 Aug 2007 11:02:48 -0500 [thread overview]
Message-ID: <20070827160247.GD25589@sgi.com> (raw)
In-Reply-To: <20070827155622.GA25589@sgi.com>
This patch adds a lock ordering rule to avoid a potential deadlock when
multiple mmap_sems need to be locked.
Signed-off-by: Dean Nelson <dcn@sgi.com>
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c 2007-08-09 19:18:15.000000000 -0500
+++ linux-2.6/mm/filemap.c 2007-08-27 09:13:47.435717670 -0500
@@ -78,6 +78,9 @@
* ->i_mutex (generic_file_buffered_write)
* ->mmap_sem (fault_in_pages_readable->do_page_fault)
*
+ * When taking multiple mmap_sems, one should lock the lowest-addressed
+ * one first proceeding on up to the highest-addressed one.
+ *
* ->i_mutex
* ->i_alloc_sem (various)
*
--
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>
next prev parent reply other threads:[~2007-08-27 16:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-27 15:56 [PATCH 0/4] SGI Altix cross partition memory (XPMEM) Dean Nelson
2007-08-27 15:59 ` [PATCH 1/4] export __put_task_struct for XPMEM Dean Nelson
2007-08-27 16:13 ` Al Viro
2007-08-27 18:10 ` Dean Nelson
2007-08-27 18:15 ` Al Viro
2007-08-27 19:19 ` Dean Nelson
2007-08-27 19:35 ` Al Viro
2007-08-27 20:24 ` Robin Holt
2007-08-27 20:47 ` Al Viro
2007-08-28 12:09 ` Robin Holt
2007-08-28 18:01 ` Christoph Hellwig
2007-08-27 16:01 ` [PATCH 2/4] export zap_page_range " Dean Nelson
2007-08-27 16:02 ` Dean Nelson [this message]
2007-08-27 16:41 ` [PATCH 4/4] add SGI Altix cross partition memory (XPMEM) driver Dean Nelson
2007-08-27 20:00 ` Adrian Bunk
2007-08-28 18:02 ` Christoph Hellwig
2007-08-28 19:00 ` Robin Holt
2007-08-28 19:05 ` Christoph Hellwig
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=20070827160247.GD25589@sgi.com \
--to=dcn@sgi.com \
--cc=akpm@linux-foundation.org \
--cc=jes@sgi.com \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=tony.luck@intel.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox