On Thu 13-08-20 09:04:42, Paul E. McKenney wrote: > On Thu, Aug 13, 2020 at 05:54:12PM +0200, Michal Hocko wrote: [...] > > If the whole bailout is guarded by CONFIG_PREEMPT_RT specific atomicity > > check then there is no functional problem - GFP_RT_SAFE would still be > > GFP_NOWAIT so functional wise the allocator will still do the right > > thing. > > Perhaps it was just me getting confused, early hour Pacific Time and > whatever other excuses might apply. But I thought that you still had > an objection to GFP_RT_SAFE based on changes in allocator semantics for > other users. There is still that problem with lockdep complaining about raw->regular spinlock on !PREEMPT_RT that would need to get resolved somehow. Thomas is not really keen on adding some lockdep annotation mechanism and unfortunatelly I do not have a different idea how to get rid of those. -- Michal Hocko SUSE Labs
