add r8169 read mac form eeprom

hc

2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/arch/s390/kvm/interrupt.c
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@@ -81,8 +81,9 @@
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 		struct esca_block *sca = vcpu->kvm->arch.sca;
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 		union esca_sigp_ctrl *sigp_ctrl =
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 			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
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-		union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
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+		union esca_sigp_ctrl new_val = {0}, old_val;
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+		old_val = READ_ONCE(*sigp_ctrl);
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 		new_val.scn = src_id;
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 		new_val.c = 1;
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 		old_val.c = 0;
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@@ -93,8 +94,9 @@
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 		struct bsca_block *sca = vcpu->kvm->arch.sca;
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 		union bsca_sigp_ctrl *sigp_ctrl =
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 			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
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-		union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
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+		union bsca_sigp_ctrl new_val = {0}, old_val;
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+		old_val = READ_ONCE(*sigp_ctrl);
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 		new_val.scn = src_id;
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 		new_val.c = 1;
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 		old_val.c = 0;
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@@ -124,16 +126,18 @@
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 		struct esca_block *sca = vcpu->kvm->arch.sca;
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 		union esca_sigp_ctrl *sigp_ctrl =
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 			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
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-		union esca_sigp_ctrl old = *sigp_ctrl;
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+		union esca_sigp_ctrl old;
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+		old = READ_ONCE(*sigp_ctrl);
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 		expect = old.value;
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 		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
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 	} else {
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 		struct bsca_block *sca = vcpu->kvm->arch.sca;
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 		union bsca_sigp_ctrl *sigp_ctrl =
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 			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
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-		union bsca_sigp_ctrl old = *sigp_ctrl;
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+		union bsca_sigp_ctrl old;
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+		old = READ_ONCE(*sigp_ctrl);
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 		expect = old.value;
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 		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
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 	}