On 02/02/16(Tue) 09:14, Stefan Sperling wrote: > On Sat, Jan 30, 2016 at 10:49:38PM +1300, Richard Procter wrote: > > - ring->queued--; > > + atomic_dec_int(&ring->queued); > > > - ring->queued += ntxds; > > + atomic_add_int(&ring->queued, ntxds); > > I don't think these make a difference in the current way of things.
It does not, the wireless stack needs some love before wifi drivers can have their interrupt handlers marked as mp-safe. > Wireless drivers run interrupts under the kernel big lock, interrupts > aren't preemptible, and AFAIK (most?) 32bit integer operations are atomic. Adding/decrementing are not because you need to reading the existing value then write the modified one :)
