[PATCH 5/9] lib/cpumask: add cpumask_weight_{eq,gt,le}

From: Yury Norov
Date: Sat Nov 27 2021 - 22:59:36 EST

Add cpumask_weight_{eq,gt,le} and replace cpumask_weight() with one
of cpumask_weight_{empty,eq,gt,le} where appropriate. This allows
cpumask_weight_*() to return earlier depending on the condition.

Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
---
arch/alpha/kernel/process.c | 2 +-
arch/ia64/kernel/setup.c | 2 +-
arch/ia64/mm/tlb.c | 2 +-
arch/mips/cavium-octeon/octeon-irq.c | 4 +--
arch/mips/kernel/crash.c | 2 +-
arch/powerpc/kernel/smp.c | 2 +-
arch/powerpc/kernel/watchdog.c | 4 +--
arch/powerpc/xmon/xmon.c | 4 +--
arch/s390/kernel/perf_cpum_cf.c | 2 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 14 +++++------
arch/x86/kernel/smpboot.c | 4 +--
arch/x86/mm/mmio-mod.c | 2 +-
arch/x86/platform/uv/uv_nmi.c | 2 +-
drivers/cpufreq/qcom-cpufreq-hw.c | 2 +-
drivers/cpufreq/scmi-cpufreq.c | 2 +-
drivers/firmware/psci/psci_checker.c | 2 +-
drivers/gpu/drm/i915/i915_pmu.c | 2 +-
drivers/hv/channel_mgmt.c | 4 +--
drivers/infiniband/hw/hfi1/affinity.c | 13 +++++-----
drivers/infiniband/hw/qib/qib_file_ops.c | 2 +-
drivers/infiniband/hw/qib/qib_iba7322.c | 2 +-
drivers/infiniband/sw/siw/siw_main.c | 3 +--
drivers/irqchip/irq-bcm6345-l1.c | 2 +-
drivers/scsi/lpfc/lpfc_init.c | 2 +-
drivers/soc/fsl/qbman/qman_test_stash.c | 2 +-
include/linux/cpumask.h | 32 ++++++++++++++++++++++++
kernel/irq/affinity.c | 2 +-
kernel/padata.c | 2 +-
kernel/rcu/tree_nocb.h | 4 +--
kernel/rcu/tree_plugin.h | 2 +-
kernel/sched/core.c | 10 ++++----
kernel/sched/topology.c | 4 +--
kernel/time/clockevents.c | 2 +-
kernel/time/clocksource.c | 2 +-
mm/vmstat.c | 4 +--
35 files changed, 89 insertions(+), 59 deletions(-)

diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 5f8527081da9..0d4bc60828bf 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -125,7 +125,7 @@ common_shutdown_1(void *generic_ptr)
/* Wait for the secondaries to halt. */
set_cpu_present(boot_cpuid, false);
set_cpu_possible(boot_cpuid, false);
- while (cpumask_weight(cpu_present_mask))
+ while (!cpumask_empty(cpu_present_mask))
barrier();
#endif

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 5010348fa21b..fd6301eafa9d 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -572,7 +572,7 @@ setup_arch (char **cmdline_p)
#ifdef CONFIG_ACPI_HOTPLUG_CPU
prefill_possible_map();
#endif
- per_cpu_scan_finalize((cpumask_weight(&early_cpu_possible_map) == 0 ?
+ per_cpu_scan_finalize((cpumask_empty(&early_cpu_possible_map) ?
32 : cpumask_weight(&early_cpu_possible_map)),
additional_cpus > 0 ? additional_cpus : 0);
#endif /* CONFIG_ACPI_NUMA */
diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index 135b5135cace..a5bce13ab047 100644
--- a/arch/ia64/mm/tlb.c
+++ b/arch/ia64/mm/tlb.c
@@ -332,7 +332,7 @@ __flush_tlb_range (struct vm_area_struct *vma, unsigned long start,

preempt_disable();
#ifdef CONFIG_SMP
- if (mm != current->active_mm || cpumask_weight(mm_cpumask(mm)) != 1) {
+ if (mm != current->active_mm || !cpumask_weight_eq(mm_cpumask(mm), 1)) {
ia64_global_tlb_purge(mm, start, end, nbits);
preempt_enable();
return;
diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index 844f882096e6..914871f15fb7 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -763,7 +763,7 @@ static void octeon_irq_cpu_offline_ciu(struct irq_data *data)
if (!cpumask_test_cpu(cpu, mask))
return;

- if (cpumask_weight(mask) > 1) {
+ if (cpumask_weight_gt(mask, 1)) {
/*
* It has multi CPU affinity, just remove this CPU
* from the affinity set.
@@ -795,7 +795,7 @@ static int octeon_irq_ciu_set_affinity(struct irq_data *data,
* This removes the need to do locking in the .ack/.eoi
* functions.
*/
- if (cpumask_weight(dest) != 1)
+ if (!cpumask_weight_eq(dest, 1))
return -EINVAL;

if (!enable_one)
diff --git a/arch/mips/kernel/crash.c b/arch/mips/kernel/crash.c
index 81845ba04835..4c35004754db 100644
--- a/arch/mips/kernel/crash.c
+++ b/arch/mips/kernel/crash.c
@@ -72,7 +72,7 @@ static void crash_kexec_prepare_cpus(void)
*/
pr_emerg("Sending IPI to other cpus...\n");
msecs = 10000;
- while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) {
+ while (cpumask_weight_le(&cpus_in_crash, ncpus) && (--msecs > 0)) {
cpu_relax();
mdelay(1);
}
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index c23ee842c4c3..2eae302ea26b 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1615,7 +1615,7 @@ void start_secondary(void *unused)
if (has_big_cores)
sibling_mask = cpu_smallcore_mask;

- if (cpumask_weight(mask) > cpumask_weight(sibling_mask(cpu)))
+ if (cpumask_weight_gt(mask, cpumask_weight(sibling_mask(cpu))))
shared_caches = true;
}

diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c
index 3fa6d240bade..9e9cba7cfb85 100644
--- a/arch/powerpc/kernel/watchdog.c
+++ b/arch/powerpc/kernel/watchdog.c
@@ -158,7 +158,7 @@ static void watchdog_smp_panic(int cpu, u64 tb)
goto out;
if (cpumask_test_cpu(cpu, &wd_smp_cpus_pending))
goto out;
- if (cpumask_weight(&wd_smp_cpus_pending) == 0)
+ if (cpumask_empty(&wd_smp_cpus_pending))
goto out;

pr_emerg("CPU %d detected hard LOCKUP on other CPUs %*pbl\n",
@@ -346,7 +346,7 @@ static void start_watchdog(void *arg)

wd_smp_lock(&flags);
cpumask_set_cpu(cpu, &wd_cpus_enabled);
- if (cpumask_weight(&wd_cpus_enabled) == 1) {
+ if (cpumask_weight_eq(&wd_cpus_enabled, 1)) {
cpumask_set_cpu(cpu, &wd_smp_cpus_pending);
wd_smp_last_reset_tb = get_tb();
}
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 8b28ff9d98d1..2073be312fe9 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -469,7 +469,7 @@ static bool wait_for_other_cpus(int ncpus)

/* We wait for 2s, which is a metric "little while" */
for (timeout = 20000; timeout != 0; --timeout) {
- if (cpumask_weight(&cpus_in_xmon) >= ncpus)
+ if (cpumask_weight_gt(&cpus_in_xmon, ncpus - 1))
return true;
udelay(100);
barrier();
@@ -1338,7 +1338,7 @@ static int cpu_cmd(void)
case 'S':
case 't':
cpumask_copy(&xmon_batch_cpus, &cpus_in_xmon);
- if (cpumask_weight(&xmon_batch_cpus) <= 1) {
+ if (cpumask_weight_le(&xmon_batch_cpus, 2)) {
printf("There are no other cpus in xmon\n");
break;
}
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index ee8707abdb6a..4d217f7f5ccf 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -975,7 +975,7 @@ static int cfset_all_start(struct cfset_request *req)
return -ENOMEM;
cpumask_and(mask, &req->mask, cpu_online_mask);
on_each_cpu_mask(mask, cfset_ioctl_on, &p, 1);
- if (atomic_read(&p.cpus_ack) != cpumask_weight(mask)) {
+ if (!cpumask_weight_eq(mask, atomic_read(&p.cpus_ack))) {
on_each_cpu_mask(mask, cfset_ioctl_off, &p, 1);
rc = -EIO;
debug_sprintf_event(cf_dbg, 4, "%s CPUs missing", __func__);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 94e7e6b420e4..5fa730063af2 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -341,14 +341,14 @@ static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,

/* Check whether cpus belong to parent ctrl group */
cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
- if (cpumask_weight(tmpmask)) {
+ if (!cpumask_empty(tmpmask)) {
rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
return -EINVAL;
}

/* Check whether cpus are dropped from this group */
cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
- if (cpumask_weight(tmpmask)) {
+ if (!cpumask_empty(tmpmask)) {
/* Give any dropped cpus to parent rdtgroup */
cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
update_closid_rmid(tmpmask, prgrp);
@@ -359,7 +359,7 @@ static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
* and update per-cpu rmid
*/
cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
- if (cpumask_weight(tmpmask)) {
+ if (!cpumask_empty(tmpmask)) {
head = &prgrp->mon.crdtgrp_list;
list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
if (crgrp == rdtgrp)
@@ -394,7 +394,7 @@ static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,

/* Check whether cpus are dropped from this group */
cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
- if (cpumask_weight(tmpmask)) {
+ if (!cpumask_empty(tmpmask)) {
/* Can't drop from default group */
if (rdtgrp == &rdtgroup_default) {
rdt_last_cmd_puts("Can't drop CPUs from default group\n");
@@ -413,12 +413,12 @@ static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
* and update per-cpu closid/rmid.
*/
cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
- if (cpumask_weight(tmpmask)) {
+ if (!cpumask_empty(tmpmask)) {
list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
if (r == rdtgrp)
continue;
cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
- if (cpumask_weight(tmpmask1))
+ if (!cpumask_empty(tmpmask1))
cpumask_rdtgrp_clear(r, tmpmask1);
}
update_closid_rmid(tmpmask, rdtgrp);
@@ -488,7 +488,7 @@ static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,

/* check that user didn't specify any offline cpus */
cpumask_andnot(tmpmask, newmask, cpu_online_mask);
- if (cpumask_weight(tmpmask)) {
+ if (!cpumask_empty(tmpmask)) {
ret = -EINVAL;
rdt_last_cmd_puts("Can only assign online CPUs\n");
goto unlock;
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index ac2909f0cab3..394071898b50 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1594,7 +1594,7 @@ static void remove_siblinginfo(int cpu)
/*/
* last thread sibling in this cpu core going down
*/
- if (cpumask_weight(topology_sibling_cpumask(cpu)) == 1)
+ if (cpumask_weight_eq(topology_sibling_cpumask(cpu), 1))
cpu_data(sibling).booted_cores--;
}

@@ -1603,7 +1603,7 @@ static void remove_siblinginfo(int cpu)

for_each_cpu(sibling, topology_sibling_cpumask(cpu)) {
cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
- if (cpumask_weight(topology_sibling_cpumask(sibling)) == 1)
+ if (cpumask_weight_eq(topology_sibling_cpumask(sibling), 1))
cpu_data(sibling).smt_active = false;
}

diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
index 933a2ebad471..c3317f0650d8 100644
--- a/arch/x86/mm/mmio-mod.c
+++ b/arch/x86/mm/mmio-mod.c
@@ -400,7 +400,7 @@ static void leave_uniprocessor(void)
int cpu;
int err;

- if (!cpumask_available(downed_cpus) || cpumask_weight(downed_cpus) == 0)
+ if (!cpumask_available(downed_cpus) || cpumask_empty(downed_cpus))
return;
pr_notice("Re-enabling CPUs...\n");
for_each_cpu(cpu, downed_cpus) {
diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index 1e9ff28bc2e0..ea277fc08357 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -985,7 +985,7 @@ static int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)

/* Clear global flags */
if (master) {
- if (cpumask_weight(uv_nmi_cpu_mask))
+ if (!cpumask_empty(uv_nmi_cpu_mask))
uv_nmi_cleanup_mask();
atomic_set(&uv_nmi_cpus_in_nmi, -1);
atomic_set(&uv_nmi_cpu, -1);
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 248135e5087e..60055ab190a9 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -475,7 +475,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
}

qcom_get_related_cpus(index, policy->cpus);
- if (!cpumask_weight(policy->cpus)) {
+ if (cpumask_empty(policy->cpus)) {
dev_err(dev, "Domain-%d failed to get related CPUs\n", index);
ret = -ENOENT;
goto error;
diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 1e0cd4d165f0..919fa6e3f462 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -154,7 +154,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
* table and opp-shared.
*/
ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->opp_shared_cpus);
- if (ret || !cpumask_weight(priv->opp_shared_cpus)) {
+ if (ret || cpumask_empty(priv->opp_shared_cpus)) {
/*
* Either opp-table is not set or no opp-shared was found.
* Use the CPU mask from SCMI to designate CPUs sharing an OPP
diff --git a/drivers/firmware/psci/psci_checker.c b/drivers/firmware/psci/psci_checker.c
index 116eb465cdb4..90c9473832a9 100644
--- a/drivers/firmware/psci/psci_checker.c
+++ b/drivers/firmware/psci/psci_checker.c
@@ -90,7 +90,7 @@ static unsigned int down_and_up_cpus(const struct cpumask *cpus,
* cpu_down() checks the number of online CPUs before the TOS
* resident CPU.
*/
- if (cpumask_weight(offlined_cpus) + 1 == nb_available_cpus) {
+ if (cpumask_weight_eq(offlined_cpus, nb_available_cpus - 1)) {
if (ret != -EBUSY) {
pr_err("Unexpected return code %d while trying "
"to power down last online CPU %d\n",
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 0b488d49694c..962e8d6bf6ea 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -1048,7 +1048,7 @@ static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
GEM_BUG_ON(!pmu->base.event_init);

/* Select the first online CPU as a designated reader. */
- if (!cpumask_weight(&i915_pmu_cpumask))
+ if (cpumask_empty(&i915_pmu_cpumask))
cpumask_set_cpu(cpu, &i915_pmu_cpumask);

return 0;
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 2829575fd9b7..da297220230d 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -762,8 +762,8 @@ static void init_vp_index(struct vmbus_channel *channel)
}
alloced_mask = &hv_context.hv_numa_map[numa_node];

- if (cpumask_weight(alloced_mask) ==
- cpumask_weight(cpumask_of_node(numa_node))) {
+ if (cpumask_weight_eq(alloced_mask,
+ cpumask_weight(cpumask_of_node(numa_node)))) {
/*
* We have cycled through all the CPUs in the node;
* reset the alloced map.
diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/hfi1/affinity.c
index 98c813ba4304..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);
@@ -667,7 +666,7 @@ int hfi1_dev_affinity_init(struct hfi1_devdata *dd)
* engines, use the same CPU cores as general/control
* context.
*/
- if (cpumask_weight(&entry->def_intr.mask) == 0)
+ if (cpumask_empty(&entry->def_intr.mask))
cpumask_copy(&entry->def_intr.mask,
&entry->general_intr_mask);
}
@@ -687,7 +686,7 @@ int hfi1_dev_affinity_init(struct hfi1_devdata *dd)
* vectors, use the same CPU core as the general/control
* context.
*/
- if (cpumask_weight(&entry->comp_vect_mask) == 0)
+ if (cpumask_empty(&entry->comp_vect_mask))
cpumask_copy(&entry->comp_vect_mask,
&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..60717606fe98 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 + 1))) {
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 ab98b6a3ae1e..636a080b2952 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);
}
diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c
index e5c586913d0b..5d6220137a70 100644
--- a/drivers/infiniband/sw/siw/siw_main.c
+++ b/drivers/infiniband/sw/siw/siw_main.c
@@ -193,8 +193,7 @@ int siw_get_tx_cpu(struct siw_device *sdev)
else
tx_cpumask = siw_cpu_info.tx_valid_cpus[node];

- num_cpus = cpumask_weight(tx_cpumask);
- if (!num_cpus) {
+ if (cpumask_empty(tx_cpumask)) {
/* no CPU on this NUMA node */
tx_cpumask = cpu_online_mask;
num_cpus = cpumask_weight(tx_cpumask);
diff --git a/drivers/irqchip/irq-bcm6345-l1.c b/drivers/irqchip/irq-bcm6345-l1.c
index fd079215c17f..142a7431745f 100644
--- a/drivers/irqchip/irq-bcm6345-l1.c
+++ b/drivers/irqchip/irq-bcm6345-l1.c
@@ -315,7 +315,7 @@ static int __init bcm6345_l1_of_init(struct device_node *dn,
cpumask_set_cpu(idx, &intc->cpumask);
}

- if (!cpumask_weight(&intc->cpumask)) {
+ if (cpumask_empty(&intc->cpumask)) {
ret = -ENODEV;
goto out_free;
}
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index ba17a8f740a9..3c9e31078f06 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -12626,7 +12626,7 @@ lpfc_cpuhp_get_eq(struct lpfc_hba *phba, unsigned int cpu,
* gone offline yet, we need >1.
*/
cpumask_and(tmp, maskp, cpu_online_mask);
- if (cpumask_weight(tmp) > 1)
+ if (cpumask_weight_gt(tmp, 1))
continue;

/* Now that we have an irq to shutdown, get the eq
diff --git a/drivers/soc/fsl/qbman/qman_test_stash.c b/drivers/soc/fsl/qbman/qman_test_stash.c
index b7e8e5ec884c..7ef6c624bb59 100644
--- a/drivers/soc/fsl/qbman/qman_test_stash.c
+++ b/drivers/soc/fsl/qbman/qman_test_stash.c
@@ -561,7 +561,7 @@ int qman_test_stash(void)
{
int err;

- if (cpumask_weight(cpu_online_mask) < 2) {
+ if (cpumask_weight_le(cpu_online_mask, 2)) {
pr_info("%s(): skip - only 1 CPU\n", __func__);
return 0;
}
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 64dae70d31f5..b5e50cf74785 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -575,6 +575,38 @@ static inline unsigned int cpumask_weight(const struct cpumask *srcp)
return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
}

+/**
+ * cpumask_weight_eq - Check if # of bits in *srcp is equal to a given number
+ * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
+ * @num: the number to check.
+ */
+static inline bool cpumask_weight_eq(const struct cpumask *srcp, unsigned int num)
+{
+ return bitmap_weight_eq(cpumask_bits(srcp), nr_cpumask_bits, num);
+}
+
+/**
+ * cpumask_weight_gt - Check if # of bits in *srcp is greater than a given number
+ * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
+ * @num: the number to check.
+ */
+static inline bool cpumask_weight_gt(const struct cpumask *srcp,
+ unsigned int num)
+{
+ return bitmap_weight_gt(cpumask_bits(srcp), nr_cpumask_bits, num);
+}
+
+/**
+ * cpumask_weight_le - Check if # of bits in *srcp is less than a given number
+ * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
+ * @num: the number to check.
+ */
+static inline bool cpumask_weight_le(const struct cpumask *srcp,
+ unsigned int num)
+{
+ return bitmap_weight_le(cpumask_bits(srcp), nr_cpumask_bits, num);
+}
+
/**
* cpumask_shift_right - *dstp = *srcp >> n
* @dstp: the cpumask result
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index f7ff8919dc9b..18740faf0eb1 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -258,7 +258,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
nodemask_t nodemsk = NODE_MASK_NONE;
struct node_vectors *node_vectors;

- if (!cpumask_weight(cpu_mask))
+ if (cpumask_empty(cpu_mask))
return 0;

nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk);
diff --git a/kernel/padata.c b/kernel/padata.c
index 18d3a5c699d8..e5819bb8bd1d 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -181,7 +181,7 @@ int padata_do_parallel(struct padata_shell *ps,
goto out;

if (!cpumask_test_cpu(*cb_cpu, pd->cpumask.cbcpu)) {
- if (!cpumask_weight(pd->cpumask.cbcpu))
+ if (cpumask_empty(pd->cpumask.cbcpu))
goto out;

/* Select an alternate fallback CPU and notify the caller. */
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 2461fe8d0c23..82473478e222 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -1135,7 +1135,7 @@ 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) */

@@ -1319,7 +1319,7 @@ 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);
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 463735a3b657..2908495cc840 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1215,7 +1215,7 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
cpu != outgoingcpu)
cpumask_set_cpu(cpu, cm);
cpumask_and(cm, cm, housekeeping_cpumask(HK_FLAG_RCU));
- if (cpumask_weight(cm) == 0)
+ if (cpumask_empty(cm))
cpumask_copy(cm, housekeeping_cpumask(HK_FLAG_RCU));
set_cpus_allowed_ptr(t, cm);
free_cpumask_var(cm);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index beaa8be6241e..c91912c0c005 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6003,7 +6003,7 @@ static void sched_core_cpu_starting(unsigned int cpu)
WARN_ON_ONCE(rq->core != rq);

/* if we're the first, we'll be our own leader */
- if (cpumask_weight(smt_mask) == 1)
+ if (cpumask_weight_eq(smt_mask, 1))
goto unlock;

/* find the leader */
@@ -6044,7 +6044,7 @@ static void sched_core_cpu_deactivate(unsigned int cpu)
sched_core_lock(cpu, &flags);

/* if we're the last man standing, nothing to do */
- if (cpumask_weight(smt_mask) == 1) {
+ if (cpumask_weight_eq(smt_mask, 1)) {
WARN_ON_ONCE(rq->core != rq);
goto unlock;
}
@@ -8715,7 +8715,7 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
{
int ret = 1;

- if (!cpumask_weight(cur))
+ if (cpumask_empty(cur))
return ret;

ret = dl_cpuset_cpumask_can_shrink(cur, trial);
@@ -9054,7 +9054,7 @@ int sched_cpu_activate(unsigned int cpu)
/*
* When going up, increment the number of cores with SMT present.
*/
- if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+ if (cpumask_weight_eq(cpu_smt_mask(cpu), 2))
static_branch_inc_cpuslocked(&sched_smt_present);
#endif
set_cpu_active(cpu, true);
@@ -9129,7 +9129,7 @@ int sched_cpu_deactivate(unsigned int cpu)
/*
* When going down, decrement the number of cores with SMT present.
*/
- if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+ if (cpumask_weight_eq(cpu_smt_mask(cpu), 2))
static_branch_dec_cpuslocked(&sched_smt_present);

sched_core_cpu_deactivate(cpu);
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index d201a7052a29..79395571599f 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -74,7 +74,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
break;
}

- if (!cpumask_weight(sched_group_span(group))) {
+ if (cpumask_empty(sched_group_span(group))) {
printk(KERN_CONT "\n");
printk(KERN_ERR "ERROR: empty group\n");
break;
@@ -169,7 +169,7 @@ static const unsigned int SD_DEGENERATE_GROUPS_MASK =

static int sd_degenerate(struct sched_domain *sd)
{
- if (cpumask_weight(sched_domain_span(sd)) == 1)
+ if (cpumask_weight_eq(sched_domain_span(sd), 1))
return 1;

/* Following flags need at least 2 groups */
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 003ccf338d20..32d6629a55b2 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -648,7 +648,7 @@ void tick_cleanup_dead_cpu(int cpu)
*/
list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
if (cpumask_test_cpu(cpu, dev->cpumask) &&
- cpumask_weight(dev->cpumask) == 1 &&
+ cpumask_weight_eq(dev->cpumask, 1) &&
!tick_is_broadcast_device(dev)) {
BUG_ON(!clockevent_state_detached(dev));
list_del(&dev->list);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index bf6a087e132f..8471b9378206 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -321,7 +321,7 @@ void clocksource_verify_percpu(struct clocksource *cs)
cpus_read_lock();
preempt_disable();
clocksource_verify_choose_cpus();
- if (cpumask_weight(&cpus_chosen) == 0) {
+ if (cpumask_empty(&cpus_chosen)) {
preempt_enable();
cpus_read_unlock();
pr_warn("Not enough CPUs to check clocksource '%s'.\n", cs->name);
diff --git a/mm/vmstat.c b/mm/vmstat.c
index d701c335628c..295642e2c24c 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -2032,7 +2032,7 @@ static void __init init_cpu_node_state(void)
int node;

for_each_online_node(node) {
- if (cpumask_weight(cpumask_of_node(node)) > 0)
+ if (!cpumask_empty(cpumask_of_node(node)))
node_set_state(node, N_CPU);
}
}
@@ -2059,7 +2059,7 @@ static int vmstat_cpu_dead(unsigned int cpu)

refresh_zone_stat_thresholds();
node_cpus = cpumask_of_node(node);
- if (cpumask_weight(node_cpus) > 0)
+ if (!cpumask_empty(node_cpus))
return 0;

node_clear_state(node, N_CPU);
--
2.25.1