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This makes future changes to priority inheritance easier, since we want to be able to look at a thread's transaction stack when selecting a thread to inherit priority for. It also allows us to take just a single lock in a few paths, where we used to take two in succession. Signed-off-by: Martijn Coenen <maco@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>