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 | Tue, 08 Apr 2008 17:44:12 +0200 | From | Andrea Arcangeli <> |
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# 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)
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