lkml.org 
[lkml]   [2008]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH 8 of 8] This patch adds a lock ordering rule to avoid a potential deadlock when
Date
From
# HG changeset patch
# User Andrea Arcangeli <andrea@qumranet.com>
# Date 1207159059 -7200
# Node ID f3f119118b0abd9c4624263ef388dc7230d937fe
# Parent 31fc23193bd039cc595fba1ca149a9715f7d0fb2
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>

diff --git a/mm/filemap.c b/mm/filemap.c
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -79,6 +79,9 @@
*
* ->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)

\
 
 \ /
  Last update: 2008-04-02 23:57    [W:0.269 / U:2.308 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site