Messages in this thread Patch in this message | | | From | Pranith Kumar <> | Subject | [PATCH 3/3] rcu: Use rcu_num_nodes instead of NUM_RCU_NODES | Date | Tue, 15 Jul 2014 18:31:49 -0400 |
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NUM_RCU_NODES is set at build time and is usually a huge number. We calculate the actual number of rcu nodes necessary at boot time based on nr_cpu_ids in rcu_init_geometry() and store it in rcu_num_nodes. We should use this variable instead of NUM_RCU_NODES.
This commit changes all such uses of NUM_RCU_NODES to rcu_num_nodes.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> --- kernel/rcu/tree_plugin.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index cedb020..17ccb62 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -46,6 +46,8 @@ static bool __read_mostly rcu_nocb_poll; /* Offload kthread are to poll. */ static char __initdata nocb_buf[NR_CPUS * 5]; #endif /* #ifdef CONFIG_RCU_NOCB_CPU */ +extern int rcu_num_nodes; + /* * Check the RCU kernel configuration parameters and print informative * messages about anything out of the ordinary. If you like #ifdef, you @@ -885,7 +887,7 @@ void synchronize_rcu_expedited(void) /* Snapshot current state of ->blkd_tasks lists. */ rcu_for_each_leaf_node(rsp, rnp) sync_rcu_preempt_exp_init(rsp, rnp); - if (NUM_RCU_NODES > 1) + if (rcu_num_nodes > 1) sync_rcu_preempt_exp_init(rsp, rcu_get_root(rsp)); put_online_cpus(); @@ -1475,7 +1477,7 @@ static void __init rcu_spawn_boost_kthreads(void) BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); rnp = rcu_get_root(rcu_state_p); (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); - if (NUM_RCU_NODES > 1) { + if (rcu_num_nodes > 1) { rcu_for_each_leaf_node(rcu_state_p, rnp) (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); } -- 1.9.1
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