[PATCH 04/17] all: replace bitmap_weight with bitmap_empty where appropriate

Yury Norov
2021-12-18T21:20:40Z

In many cases, kernel code calls bitmap_weight() to check if any bit of
a given bitmap is set. It's better to use bitmap_empty() in that case
because bitmap_empty() stops traversing the bitmap as soon as it finds
first set bit, while bitmap_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
arch/nds32/kernel/perf_event_cpu.c | 2 +-
arch/x86/kvm/hyperv.c | 8 ++++----
drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c | 2 +-
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c | 4 ++--
drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c | 4 ++--
drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 2 +-
drivers/net/ethernet/qlogic/qed/qed_rdma.c | 4 ++--
drivers/net/ethernet/qlogic/qed/qed_roce.c | 2 +-
drivers/perf/arm-cci.c | 2 +-
drivers/perf/arm_pmu.c | 4 ++--
drivers/perf/hisilicon/hisi_uncore_pmu.c | 2 +-
drivers/perf/xgene_pmu.c | 2 +-
tools/perf/builtin-c2c.c | 4 ++--
13 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/arch/nds32/kernel/perf_event_cpu.c b/arch/nds32/kernel/perf_event_cpu.c
index a78a879e7ef1..ea44e9ecb5c7 100644
--- a/arch/nds32/kernel/perf_event_cpu.c
+++ b/arch/nds32/kernel/perf_event_cpu.c
@@ -695,7 +695,7 @@ static void nds32_pmu_enable(struct pmu *pmu)
{
struct nds32_pmu *nds32_pmu = to_nds32_pmu(pmu);
struct pmu_hw_events *hw_events = nds32_pmu->get_hw_events();
- int enabled = bitmap_weight(hw_events->used_mask,
+ bool enabled = !bitmap_empty(hw_events->used_mask,
nds32_pmu->num_events);

if (enabled)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 6e38a7d22e97..2c3400dea4b3 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -90,7 +90,7 @@ static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
{
struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
- int auto_eoi_old, auto_eoi_new;
+ bool auto_eoi_old, auto_eoi_new;

if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
return;
@@ -100,16 +100,16 @@ static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
else
__clear_bit(vector, synic->vec_bitmap);

- auto_eoi_old = bitmap_weight(synic->auto_eoi_bitmap, 256);
+ auto_eoi_old = bitmap_empty(synic->auto_eoi_bitmap, 256);

if (synic_has_vector_auto_eoi(synic, vector))
__set_bit(vector, synic->auto_eoi_bitmap);
else
__clear_bit(vector, synic->auto_eoi_bitmap);

- auto_eoi_new = bitmap_weight(synic->auto_eoi_bitmap, 256);
+ auto_eoi_new = bitmap_empty(synic->auto_eoi_bitmap, 256);

- if (!!auto_eoi_old == !!auto_eoi_new)
+ if (auto_eoi_old == auto_eoi_new)
return;

down_write(&vcpu->kvm->arch.apicv_update_lock);
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
index d7fa2c49e741..56a3063545ec 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
@@ -68,7 +68,7 @@ static int smp_request_block(struct mdp5_smp *smp,
uint8_t reserved;

/* we shouldn't be requesting blocks for an in-use client: */
- WARN_ON(bitmap_weight(cs, cnt) > 0);
+ WARN_ON(!bitmap_empty(cs, cnt));

reserved = smp->reserved[cid];

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
index 61b2db3342ed..ac0fe04df2e0 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
@@ -267,8 +267,8 @@ ice_set_pfe_link(struct ice_vf *vf, struct virtchnl_pf_event *pfe,
*/
static bool ice_vf_has_no_qs_ena(struct ice_vf *vf)
{
- return (!bitmap_weight(vf->rxq_ena, ICE_MAX_RSS_QS_PER_VF) &&
- !bitmap_weight(vf->txq_ena, ICE_MAX_RSS_QS_PER_VF));
+ return (bitmap_empty(vf->rxq_ena, ICE_MAX_RSS_QS_PER_VF) &&
+ bitmap_empty(vf->txq_ena, ICE_MAX_RSS_QS_PER_VF));
}

/**
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
index 77a13fb555fb..80b2d64b4136 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
@@ -353,7 +353,7 @@ int otx2_add_macfilter(struct net_device *netdev, const u8 *mac)
{
struct otx2_nic *pf = netdev_priv(netdev);

- if (bitmap_weight(&pf->flow_cfg->dmacflt_bmap,
+ if (!bitmap_empty(&pf->flow_cfg->dmacflt_bmap,
pf->flow_cfg->dmacflt_max_flows))
netdev_warn(netdev,
"Add %pM to CGX/RPM DMAC filters list as well\n",
@@ -436,7 +436,7 @@ int otx2_get_maxflows(struct otx2_flow_config *flow_cfg)
return 0;

if (flow_cfg->nr_flows == flow_cfg->max_flows ||
- bitmap_weight(&flow_cfg->dmacflt_bmap,
+ !bitmap_empty(&flow_cfg->dmacflt_bmap,
flow_cfg->dmacflt_max_flows))
return flow_cfg->max_flows + flow_cfg->dmacflt_max_flows;
else
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index 6080ebd9bd94..3d369ccc7ab9 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -1115,7 +1115,7 @@ static int otx2_cgx_config_loopback(struct otx2_nic *pf, bool enable)
struct msg_req *msg;
int err;

- if (enable && bitmap_weight(&pf->flow_cfg->dmacflt_bmap,
+ if (enable && !bitmap_empty(&pf->flow_cfg->dmacflt_bmap,
pf->flow_cfg->dmacflt_max_flows))
netdev_warn(pf->netdev,
"CGX/RPM internal loopback might not work as DMAC filters are active\n");
diff --git a/drivers/net/ethernet/qlogic/qed/qed_rdma.c b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
index 23b668de4640..b6e2e17bac04 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
@@ -336,7 +336,7 @@ void qed_rdma_bmap_free(struct qed_hwfn *p_hwfn,

/* print aligned non-zero lines, if any */
for (item = 0, line = 0; line < last_line; line++, item += 8)
- if (bitmap_weight((unsigned long *)&pmap[item], 64 * 8))
+ if (!bitmap_empty((unsigned long *)&pmap[item], 64 * 8))
DP_NOTICE(p_hwfn,
"line 0x%04x: 0x%016llx 0x%016llx 0x%016llx 0x%016llx 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n",
line,
@@ -350,7 +350,7 @@ void qed_rdma_bmap_free(struct qed_hwfn *p_hwfn,

/* print last unaligned non-zero line, if any */
if ((bmap->max_count % (64 * 8)) &&
- (bitmap_weight((unsigned long *)&pmap[item],
+ (!bitmap_empty((unsigned long *)&pmap[item],
bmap->max_count - item * 64))) {
offset = sprintf(str_last_line, "line 0x%04x: ", line);
for (; item < last_item; item++)
diff --git a/drivers/net/ethernet/qlogic/qed/qed_roce.c b/drivers/net/ethernet/qlogic/qed/qed_roce.c
index 071b4aeaddf2..134ecfca96a3 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_roce.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_roce.c
@@ -76,7 +76,7 @@ void qed_roce_stop(struct qed_hwfn *p_hwfn)
* We delay for a short while if an async destroy QP is still expected.
* Beyond the added delay we clear the bitmap anyway.
*/
- while (bitmap_weight(rcid_map->bitmap, rcid_map->max_count)) {
+ while (!bitmap_empty(rcid_map->bitmap, rcid_map->max_count)) {
/* If the HW device is during recovery, all resources are
* immediately reset without receiving a per-cid indication
* from HW. In this case we don't expect the cid bitmap to be
diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 54aca3a62814..96e09fa40909 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1096,7 +1096,7 @@ static void cci_pmu_enable(struct pmu *pmu)
{
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
- int enabled = bitmap_weight(hw_events->used_mask, cci_pmu->num_cntrs);
+ bool enabled = !bitmap_empty(hw_events->used_mask, cci_pmu->num_cntrs);
unsigned long flags;

if (!enabled)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 295cc7952d0e..a31b302b0ade 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -524,7 +524,7 @@ static void armpmu_enable(struct pmu *pmu)
{
struct arm_pmu *armpmu = to_arm_pmu(pmu);
struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
- int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
+ bool enabled = !bitmap_empty(hw_events->used_mask, armpmu->num_events);

/* For task-bound events we may be called on other CPUs */
if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
@@ -785,7 +785,7 @@ static int cpu_pm_pmu_notify(struct notifier_block *b, unsigned long cmd,
{
struct arm_pmu *armpmu = container_of(b, struct arm_pmu, cpu_pm_nb);
struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
- int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
+ bool enabled = !bitmap_empty(hw_events->used_mask, armpmu->num_events);

if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
return NOTIFY_DONE;
diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c
index a738aeab5c04..358e4e284a62 100644
--- a/drivers/perf/hisilicon/hisi_uncore_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c
@@ -393,7 +393,7 @@ EXPORT_SYMBOL_GPL(hisi_uncore_pmu_read);
void hisi_uncore_pmu_enable(struct pmu *pmu)
{
struct hisi_pmu *hisi_pmu = to_hisi_pmu(pmu);
- int enabled = bitmap_weight(hisi_pmu->pmu_events.used_mask,
+ bool enabled = !bitmap_empty(hisi_pmu->pmu_events.used_mask,
hisi_pmu->num_counters);

if (!enabled)
diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index 2b6d476bd213..88bd100a9633 100644
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -867,7 +867,7 @@ static void xgene_perf_pmu_enable(struct pmu *pmu)
{
struct xgene_pmu_dev *pmu_dev = to_pmu_dev(pmu);
struct xgene_pmu *xgene_pmu = pmu_dev->parent;
- int enabled = bitmap_weight(pmu_dev->cntr_assign_mask,
+ bool enabled = !bitmap_empty(pmu_dev->cntr_assign_mask,
pmu_dev->max_counters);

if (!enabled)
diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index b5c67ef73862..51997386fb31 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -1080,7 +1080,7 @@ node_entry(struct perf_hpp_fmt *fmt __maybe_unused, struct perf_hpp *hpp,
bitmap_zero(set, c2c.cpus_cnt);
bitmap_and(set, c2c_he->cpuset, c2c.nodes[node], c2c.cpus_cnt);

- if (!bitmap_weight(set, c2c.cpus_cnt)) {
+ if (bitmap_empty(set, c2c.cpus_cnt)) {
if (c2c.node_info == 1) {
ret = scnprintf(hpp->buf, hpp->size, "%21s", " ");
advance_hpp(hpp, ret);
@@ -1944,7 +1944,7 @@ static int set_nodestr(struct c2c_hist_entry *c2c_he)
if (c2c_he->nodestr)
return 0;

- if (bitmap_weight(c2c_he->nodeset, c2c.nodes_cnt)) {
+ if (!bitmap_empty(c2c_he->nodeset, c2c.nodes_cnt)) {
len = bitmap_scnprintf(c2c_he->nodeset, c2c.nodes_cnt,
buf, sizeof(buf));
} else {
--
2.30.2