On 4/16/19 4:02 AM, Andrew Morton wrote: > Requiring a kernel rebuild is rather user-hostile. A boot option > (early_param()) would be much more useful and I expect that the loss in > coverage would be small and acceptable? Could possibly use the > static_branch infrastructure. Agreed. There could be a config option to make it default on if no param given. Then a config option to (not) compile this in at all would be probably superfluous, although small systems/architectures without effective static keys might care.