On Mon, Mar 22, 2021 at 06:41:30PM +0100, Antoine Tenart wrote: > Quoting Matthew Wilcox (2021-03-22 17:54:39) > > - rcu_read_lock(); > > - dev_maps = rcu_dereference(dev->xps_maps[type]); > > + dev_maps = READ_ONCE(dev->xps_maps[type]); > > Couldn't dev_maps be freed between here and the read of dev_maps->nr_ids > as we're not in an RCU read-side critical section?
Oh, good point. Never mind, then. > My feeling is there is not much value in having a tricky allocation > logic for reads from xps_cpus and xps_rxqs. While we could come up with > something, returning -ENOMEM on memory pressure should be fine. That's fine. It's your code, and this is probably a small allocation anyway.
