bitmap_weight() counts all set bits in the bitmap unconditionally.
However in some cases we can traverse a part of bitmap when we
only need to check if number of set bits is greater, less or equal
to some number.
This patch replaces bitmap_weight() with one of
bitmap_{empty,full,eq,gt,le), as appropriate.
In some places driver code has been optimized further, where it's
trivial.
Signed-off-by: Yury Norov
---
arch/nds32/kernel/perf_event_cpu.c | 4 +---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 4 ++--
arch/x86/kvm/hyperv.c | 8
drivers/crypto/ccp/ccp-dev-v5.c| 5 +
drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c | 2 +-
drivers/iio/adc/mxs-lradc-adc.c| 3 +--
drivers/iio/dummy/iio_simple_dummy_buffer.c| 4 ++--
drivers/iio/industrialio-buffer.c | 2 +-
drivers/iio/industrialio-trigger.c | 2 +-
drivers/memstick/core/ms_block.c | 4 ++--
drivers/net/dsa/b53/b53_common.c | 2 +-
drivers/net/ethernet/broadcom/bcmsysport.c | 6 +-
drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c | 4 ++--
drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 2 +-
.../ethernet/marvell/octeontx2/nic/otx2_ethtool.c | 2 +-
.../ethernet/marvell/octeontx2/nic/otx2_flows.c| 8
.../net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 2 +-
drivers/net/ethernet/mellanox/mlx4/cmd.c | 10 +++---
drivers/net/ethernet/mellanox/mlx4/eq.c| 4 ++--
drivers/net/ethernet/mellanox/mlx4/main.c | 2 +-
.../net/ethernet/mellanox/mlx5/core/en_ethtool.c | 2 +-
drivers/net/ethernet/qlogic/qed/qed_dev.c | 3 +--
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/thunderx2_pmu.c | 3 +--
drivers/perf/xgene_pmu.c | 2 +-
drivers/pwm/pwm-pca9685.c | 2 +-
drivers/staging/media/tegra-video/vi.c | 2 +-
drivers/thermal/intel/intel_powerclamp.c | 10 --
fs/ocfs2/cluster/heartbeat.c | 14 +++---
33 files changed, 57 insertions(+), 75 deletions(-)
diff --git a/arch/nds32/kernel/perf_event_cpu.c
b/arch/nds32/kernel/perf_event_cpu.c
index a78a879e7ef1..05a1cd258356 100644
--- a/arch/nds32/kernel/perf_event_cpu.c
+++ b/arch/nds32/kernel/perf_event_cpu.c
@@ -695,10 +695,8 @@ 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,
- nds32_pmu->num_events);
- if (enabled)
+ if (!bitmap_empty(hw_events->used_mask, nds32_pmu->num_events))
nds32_pmu->start(nds32_pmu);
}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index b57b3db9a6a7..94e7e6b420e4 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2749,10 +2749,10 @@ static int __init_one_rdt_domain(struct rdt_domain *d,
struct resctrl_schema *s,
cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
/*
* Assign the u32 CBM to an unsigned long to ensure that
-* bitmap_weight() does not access out-of-bound memory.
+* bitmap_weight_le() does not access out-of-bound memory.
*/
tmp_cbm = cfg->new_ctrl;
- if (bitmap_weight(_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
+ if (bitmap_weight_le(_cbm, r->cache.cbm_len, r->cache.min_cbm_bits)
{
rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
return -ENOSPC;
}
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 5e19e6e4c2ce..8b72c896e0f1 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,
