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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-11-10 08:07:08 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-01-06 11:02:50 -0800 |
| commit | 5d0b024973027556b48a09bb36b55dc853ec7c6e (patch) | |
| tree | 57764b5b8758710b2f788fbadc798b89d716ea03 /kernel | |
| parent | rcu: Don't initiate RCU priority boosting on root rcu_node (diff) | |
| download | linux-dev-5d0b024973027556b48a09bb36b55dc853ec7c6e.tar.xz linux-dev-5d0b024973027556b48a09bb36b55dc853ec7c6e.zip | |
rcu: Don't bother affinitying rcub kthreads away from offline CPUs
When rcu_boost_kthread_setaffinity() sees that all CPUs for a given
rcu_node structure are now offline, it affinities the corresponding
RCU-boost ("rcub") kthread away from those CPUs. This is pointless
because the kthread cannot run on those offline CPUs in any case.
This commit therefore removes this unneeded code.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 3e64bb197b1a..1fac68220999 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1322,12 +1322,8 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) for (cpu = rnp->grplo; cpu <= rnp->grphi; cpu++, mask >>= 1) if ((mask & 0x1) && cpu != outgoingcpu) cpumask_set_cpu(cpu, cm); - if (cpumask_weight(cm) == 0) { + if (cpumask_weight(cm) == 0) cpumask_setall(cm); - for (cpu = rnp->grplo; cpu <= rnp->grphi; cpu++) - cpumask_clear_cpu(cpu, cm); - WARN_ON_ONCE(cpumask_weight(cm) == 0); - } set_cpus_allowed_ptr(t, cm); free_cpumask_var(cm); } |