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rcu: Substitute lookup for bit-twiddling in sync_rcu_exp_select_node_cpus()

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The code in sync_rcu_exp_select_node_cpus() calculates the current
CPU's mask within its rcu_node structure's bitmasks, but this has
already been computed in the ->grpmask field of that CPU's rcu_data
structure.  This commit therefore just uses this ->grpmask field.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2019-10-30 06:51:57 -07:00
parent 6cf539a87a
commit aca2991a25
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree_exp.h
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@ -345,8 +345,8 @@ static void sync_rcu_exp_select_node_cpus(struct work_struct *wp)
/* Each pass checks a CPU for identity, offline, and idle. */
mask_ofl_test = 0;
for_each_leaf_node_cpu_mask(rnp, cpu, rnp->expmask) {
unsigned long mask = leaf_node_cpu_bit(rnp, cpu);
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
unsigned long mask = rdp->grpmask;
int snap;
if (raw_smp_processor_id() == cpu ||
@ -373,8 +373,8 @@ static void sync_rcu_exp_select_node_cpus(struct work_struct *wp)
/* IPI the remaining CPUs for expedited quiescent state. */
for_each_leaf_node_cpu_mask(rnp, cpu, mask_ofl_ipi) {
unsigned long mask = leaf_node_cpu_bit(rnp, cpu);
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
unsigned long mask = rdp->grpmask;
retry_ipi:
if (rcu_dynticks_in_eqs_since(rdp, rdp->exp_dynticks_snap)) {