On Oct 14, 2015, at 03:20 PM, Nick Coghlan wrote:

>The rationale behind "platform_default" relates to what we put in the default
>config file in the RPM. If enable/disable are the only options, then as soon
>as the first version ships with "disable" as the default, affected systems
>will *never* switch to being enabled by default unless the system
>administrator changes it.
>
>By contrast, if we put "platform_default" in the default configuration, then
>inattentive sysadmins could theoretically eventually have their defaults
>switched to "enable" at some point.
>
>We don't know yet if we'd ever upgrade the "platform_default" setting, but I
>think it's worthwhile to retain the option.

We've consulted with the Ubuntu security team and have decided not to enable
it for Ubuntu 14.04 LTS.  For upgrades from there to newer releases, we won't
include the patch and will just enable it by default.  So for us,
platform_default doesn't make sense.