Re: [PATCH 1/2] locking/lockdep: Add support for dynamic depmaps and keys

[Peter Zijlstra]

On Fri, Nov 09, 2018 at 03:46:44PM -0800, Bart Van Assche wrote:
> The lock validator forces to categorize multiple instances of a lock object
> as the same lock class because it requires that struct lockdep_map and struct
> lock_class_key instances are static objects. This can result in false
> positive lockdep reports that are hard to suppress in an elegant way. Hence
> add support for allocating instances of these objects dynamically.

Yeah, I think not. You completely fail to explain how what you propose
is correct.

The thing is; we rely on static objects because they provide
persistence. Their address will never be re-used.

Dynamic objects do not provide this same guarantee. And when you re-use
the key address for something else, you'll mix the chains and things
come unstuck.