On Thu, Nov 08, 2012 at 02:08:41PM +0000, Arnd Bergmann wrote:

The newly introduced l2_wt_override should be in the same #ifdef
as the code using it, otherwise we get:

arch/arm/mm/cache-l2x0.c:37:12: warning: 'l2_wt_override' defined but not used

This should already be fixed.  I think your patch pre-dates 7547/4.