[PATCH tip/core/rcu 03/20] rcu: Fix CPU offload boot message when no CPUs are offloaded

From: Paul E. McKenney
Date: Mon Feb 26 2018 - 16:59:06 EST


In CONFIG_RCU_NOCB_CPU=y kernels, if the boot parameters indicate that
none of the CPUs should in fact be offloaded, the following somewhat
obtuse message appears:

Offload RCU callbacks from CPUs: .

This commit therefore makes the message at least grammatically correct
in this case:

Offload RCU callbacks from CPUs: (none)

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree_plugin.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index fb88a028deec..93f5649ffd2b 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2312,8 +2312,11 @@ void __init rcu_init_nohz(void)
cpumask_and(rcu_nocb_mask, cpu_possible_mask,
rcu_nocb_mask);
}
- pr_info("\tOffload RCU callbacks from CPUs: %*pbl.\n",
- cpumask_pr_args(rcu_nocb_mask));
+ if (cpumask_empty(rcu_nocb_mask))
+ pr_info("\tOffload RCU callbacks from CPUs: (none).\n");
+ else
+ pr_info("\tOffload RCU callbacks from CPUs: %*pbl.\n",
+ cpumask_pr_args(rcu_nocb_mask));
if (rcu_nocb_poll)
pr_info("\tPoll for callbacks from no-CBs CPUs.\n");

--
2.5.2