# HG changeset patch # User Andrea Arcangeli <[EMAIL PROTECTED]> # 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 <[EMAIL PROTECTED]> 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) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
