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@xxxxxxx> 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 from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|