On 2017-03-17 14:41:09 [+0100], Peter Zijlstra wrote: > On Fri, Mar 17, 2017 at 02:07:05AM +0800, kernel test robot wrote: > > > locking/lockdep: Handle statically initialized PER_CPU locks properly > > > [ 11.712266] INFO: trying to register non-static key. > > Blergh; so the problem is that when we assign can_addr to lock->key, we > can, upon using a different subclass, reach static_obj(lock->key), which > will fail on the can_addr. > > One way to fix this would be to redefine the canonical address as the > per-cpu address for a specific cpu; the below hard codes cpu0, but I'm > not sure we want to rely on cpu0 being a valid cpu.
This solves two problems: The one reported by the bot. The other thing, that is fixed by the patch, is that the first PER-CPU variable built-in will return 0 for can_addr and so will the first variable in every module. As far as I understand it, this should be unique and having the same value for multiple different variables does not look too good :) So adding the offset from CPU0 sounds good. Sebastian
