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Subject[PATCH 44/54] infiniband: replace cpumask_weight with cpumask_weight_{eq, ...} where appropriate
Date
Infiniband code uses cpumask_weight() to compare the weight of
cpumask with a given number. We can do it more efficiently with
cpumask_weight_{eq, ...} because conditional cpumask_weight may stop
traversing the cpumask earlier, as soon as condition is met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
drivers/infiniband/hw/hfi1/affinity.c | 9 ++++-----
drivers/infiniband/hw/qib/qib_file_ops.c | 2 +-
drivers/infiniband/hw/qib/qib_iba7322.c | 2 +-
3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/hfi1/affinity.c
index 38eee675369a..7c5ca5c5306a 100644
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -507,7 +507,7 @@ static int _dev_comp_vect_cpu_mask_init(struct hfi1_devdata *dd,
* available CPUs divide it by the number of devices in the
* local NUMA node.
*/
- if (cpumask_weight(&entry->comp_vect_mask) == 1) {
+ if (cpumask_weight_eq(&entry->comp_vect_mask, 1)) {
possible_cpus_comp_vect = 1;
dd_dev_warn(dd,
"Number of kernel receive queues is too large for completion vector affinity to be effective\n");
@@ -593,7 +593,7 @@ int hfi1_dev_affinity_init(struct hfi1_devdata *dd)
{
struct hfi1_affinity_node *entry;
const struct cpumask *local_mask;
- int curr_cpu, possible, i, ret;
+ int curr_cpu, i, ret;
bool new_entry = false;

local_mask = cpumask_of_node(dd->node);
@@ -626,10 +626,9 @@ int hfi1_dev_affinity_init(struct hfi1_devdata *dd)
local_mask);

/* fill in the receive list */
- possible = cpumask_weight(&entry->def_intr.mask);
curr_cpu = cpumask_first(&entry->def_intr.mask);

- if (possible == 1) {
+ if (cpumask_weight_eq(&entry->def_intr.mask, 1)) {
/* only one CPU, everyone will use it */
cpumask_set_cpu(curr_cpu, &entry->rcv_intr.mask);
cpumask_set_cpu(curr_cpu, &entry->general_intr_mask);
@@ -1017,7 +1016,7 @@ int hfi1_get_proc_affinity(int node)
cpu = cpumask_first(proc_mask);
cpumask_set_cpu(cpu, &set->used);
goto done;
- } else if (current->nr_cpus_allowed < cpumask_weight(&set->mask)) {
+ } else if (cpumask_weight_gt(&set->mask, current->nr_cpus_allowed)) {
hfi1_cdbg(PROC, "PID %u %s affinity set to CPU set(s) %*pbl",
current->pid, current->comm,
cpumask_pr_args(proc_mask));
diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index aa290928cf96..add89bc21b0a 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -1151,7 +1151,7 @@ static void assign_ctxt_affinity(struct file *fp, struct qib_devdata *dd)
* reserve a processor for it on the local NUMA node.
*/
if ((weight >= qib_cpulist_count) &&
- (cpumask_weight(local_mask) <= qib_cpulist_count)) {
+ (cpumask_weight_le(local_mask, qib_cpulist_count))) {
for_each_cpu(local_cpu, local_mask)
if (!test_and_set_bit(local_cpu, qib_cpulist)) {
fd->rec_cpu_num = local_cpu;
diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
index ceed302cf6a0..b17f96509d2c 100644
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -3405,7 +3405,7 @@ static void qib_setup_7322_interrupt(struct qib_devdata *dd, int clearpend)
local_mask = cpumask_of_pcibus(dd->pcidev->bus);
firstcpu = cpumask_first(local_mask);
if (firstcpu >= nr_cpu_ids ||
- cpumask_weight(local_mask) == num_online_cpus()) {
+ cpumask_weight_eq(local_mask, num_online_cpus())) {
local_mask = topology_core_cpumask(0);
firstcpu = cpumask_first(local_mask);
}
--
2.30.2
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