Re: [PATCH v2 2/3] lockdep: Remove BROKEN flag of LOCKDEP_CROSSRELEASE

[Bart Van Assche]

On Thu, 2017-10-19 at 13:33 -0700, Matthew Wilcox wrote:
> For example, the page lock is not annotatable with lockdep -- we return
> to userspace with it held, for heaven's sake!  So it is quite easy for
> someone not familiar with the MM locking hierarchy to inadvertently
> introduce an ABBA deadlock against the page lock.  (ie me.  I did that.)
> Right now, that has to be caught by a human reviewer; if cross-release
> checking can catch that, then it's worth having.

Hello Matthew,

Although I agree that enabling lock inversion checking for page locks is
useful, I think my questions still apply to other locking objects than page
locks.

Thanks,

Bart.