The UAC (unaligned access control) patch for Alpha breaks due to changes in ctl_table structure and register_sysctl_table function. Here's an updated patch fixing these issues + an issue where the kernel would break if the UAC option wasn't enabled.
Created attachment 119239 [details, diff] Updated UAC patch.
Thanks, patch looks fine
Fixed in gentoo-sources-2.6.21-r1 (genpatches-2.6.21-2)