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authorYury Norov <yury.norov@gmail.com>2022-01-23 21:38:53 +0300
committerPaul E. McKenney <paulmck@kernel.org>2022-02-14 21:36:58 +0300
commit6a2c1d450a6a328027280a854019c55de989e14e (patch)
tree1925663bebf81e6f9681cf7e7be9730dc6f3cc98 /kernel/rcu/tree_nocb.h
parente6339d3b443c436c3b8f45eefec2212a8c07065d (diff)
downloadlinux-6a2c1d450a6a328027280a854019c55de989e14e.tar.xz
rcu: Replace cpumask_weight with cpumask_empty where appropriate
In some places, RCU code calls cpumask_weight() to check if any bit of a given cpumask is set. We can do it more efficiently with cpumask_empty() because cpumask_empty() stops traversing the cpumask as soon as it finds first set bit, while cpumask_weight() counts all bits unconditionally. Signed-off-by: Yury Norov <yury.norov@gmail.com> Acked-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_nocb.h')
-rw-r--r--kernel/rcu/tree_nocb.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index eeafb546a7a0..f83c7b1d6110 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -1169,7 +1169,7 @@ void __init rcu_init_nohz(void)
struct rcu_data *rdp;
#if defined(CONFIG_NO_HZ_FULL)
- if (tick_nohz_full_running && cpumask_weight(tick_nohz_full_mask))
+ if (tick_nohz_full_running && !cpumask_empty(tick_nohz_full_mask))
need_rcu_nocb_mask = true;
#endif /* #if defined(CONFIG_NO_HZ_FULL) */
@@ -1348,7 +1348,7 @@ static void __init rcu_organize_nocb_kthreads(void)
*/
void rcu_bind_current_to_nocb(void)
{
- if (cpumask_available(rcu_nocb_mask) && cpumask_weight(rcu_nocb_mask))
+ if (cpumask_available(rcu_nocb_mask) && !cpumask_empty(rcu_nocb_mask))
WARN_ON(sched_setaffinity(current->pid, rcu_nocb_mask));
}
EXPORT_SYMBOL_GPL(rcu_bind_current_to_nocb);