[PATCH 11/22] dbus: Use shared NoopDDA to utilize code cache better

[Mark Kettenis]

> From: Pauli <ext-pauli.nieminen at nokia.com>
> Date: Wed, 29 Dec 2010 21:27:23 +0200
> 
> From: Pauli Nieminen <ext-pauli.nieminen at nokia.com>
> 
> Calling function that is in code cache is order of magnitude faster. In
> arm non-cached simple function takes about 1us while cached function
> takes max 200ns.

See my objection to the udev diff.  However, perhaps it does make
sense to have a generic no-op block handler, and use that instead of
the static ones scattered around the code.  Could improve things
without having to resort to ugly hacks.