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 | Wed, 02 Apr 2008 23:30:09 +0200 | From | Andrea Arcangeli <> |
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# 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)
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