KVM: x86: hyper-v: replace bitmap_weight() with hweight64()

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 <[email protected]>
CC: Dave Hansen <[email protected]>
CC: H. Peter Anvin <[email protected]>
CC: Ingo Molnar <[email protected]>
CC: Jim Mattson <[email protected]>
CC: Joerg Roedel <[email protected]>
CC: Paolo Bonzini <[email protected]>
CC: Sean Christopherson <[email protected]>
CC: Thomas Gleixner <[email protected]>
CC: Vitaly Kuznetsov <[email protected]>
CC: Wanpeng Li <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
Acked-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Yury Norov <[email protected]>

Author: YuryNorov

arch/x86/kvm/hyperv.c

@@ -1879,7 +1879,7 @@ 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)
@@ -1980,7 +1980,7 @@ 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((unsigned long *)&valid_bank_mask, 64))
+		if (hc->var_cnt != hweight64(valid_bank_mask))
 			return HV_STATUS_INVALID_HYPERCALL_INPUT;
 
 		if (all_cpus)