On Mon, Dec 13, 2021 at 05:46:28PM +0000, broonie@kernel.org wrote:

> - kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \
> - 	 $(KVM)/vfio.o $(KVM)/irqchip.o $(KVM)/binary_stats.o \
> - 	 arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
>  -kvm-y += arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \
> ++kvm-y := arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \

This should of course have used the +=.