lkml.org 
[lkml]   [2008]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH 9 of 9] 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 1207666972 -7200
    # Node ID bd55023b22769ecb14b26c2347947f7d6d63bcea
    # Parent 3b14e26a4e0491f00bb989be04d8b7e0755ed2d7
    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: 2008-04-08 18:03    [W:0.020 / U:0.020 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site