On Fri, Jul 31, 2020 at 02:29:19PM -0700, Andrew Morton wrote: > On Fri, 31 Jul 2020 14:24:57 -0700 "Paul E. McKenney" <paulmck@xxxxxxxxxx> wrote: > > > The reason for this restriction is that in -rt, the spin_lock(&zone->lock) > > in rmqueue_bulk() can sleep. > > So if there is runtime overhead, this overhead could be restricted to > -rt kernels with suitable ifdefs? In theory, yes. In practice, with CONFIG_PROVE_RAW_LOCK_NESTING=y, lockdep will complain regardless of -rt or not. Thanx, Paul
