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    Subject[PATCH 11/22] KVM: x86: hyper-v: replace bitmap_weight() with hweight64()
    Date
    kvm_hv_flush_tlb() applies bitmap API to a u64 variable valid_bank_mask.
    Since valid_bank_mask has a fixed size, we can use hweight64() and avoid
    excessive bloating.

    CC: Borislav Petkov <bp@alien8.de>
    CC: Dave Hansen <dave.hansen@linux.intel.com>
    CC: H. Peter Anvin <hpa@zytor.com>
    CC: Ingo Molnar <mingo@redhat.com>
    CC: Jim Mattson <jmattson@google.com>
    CC: Joerg Roedel <joro@8bytes.org>
    CC: Paolo Bonzini <pbonzini@redhat.com>
    CC: Sean Christopherson <seanjc@google.com>
    CC: Thomas Gleixner <tglx@linutronix.de>
    CC: Vitaly Kuznetsov <vkuznets@redhat.com>
    CC: Wanpeng Li <wanpengli@tencent.com>
    CC: kvm@vger.kernel.org
    CC: linux-kernel@vger.kernel.org
    CC: x86@kernel.org
    Signed-off-by: Yury Norov <yury.norov@gmail.com>
    ---
    arch/x86/kvm/hyperv.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
    index 41585f0edf1e..b652b856df2b 100644
    --- a/arch/x86/kvm/hyperv.c
    +++ b/arch/x86/kvm/hyperv.c
    @@ -1855,7 +1855,7 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
    all_cpus = flush_ex.hv_vp_set.format !=
    HV_GENERIC_SET_SPARSE_4K;

    - if (hc->var_cnt != bitmap_weight((unsigned long *)&valid_bank_mask, 64))
    + if (hc->var_cnt != hweight64(valid_bank_mask))
    return HV_STATUS_INVALID_HYPERCALL_INPUT;

    if (all_cpus)
    @@ -1956,7 +1956,7 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
    valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
    all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;

    - if (hc->var_cnt != bitmap_weight(&valid_bank_mask, 64))
    + if (hc->var_cnt != hweight64(valid_bank_mask))
    return HV_STATUS_INVALID_HYPERCALL_INPUT;

    if (all_cpus)
    --
    2.32.0
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