KVM: get rid of $(addprefix ../../../virt/kvm/, ...) in Makefiles

As requested by the KVM maintainers, remove the addprefix used to
refer to the main KVM code from the arch code, and replace it with
a KVM variable that does the same thing.
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Christoffer Dall <cdall@cs.columbia.edu>
Acked-by: Xiantao Zhang <xiantao.zhang@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

arch/arm/kvm/Makefile

@@ -15,7 +15,7 @@ AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt)
 AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)
 
 KVM := ../../../virt/kvm
-kvm-arm-y = $(addprefix $(KVM)/, kvm_main.o coalesced_mmio.o)
+kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o
 
 obj-y += kvm-arm.o init.o interrupts.o
 obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o

arch/ia64/kvm/Makefile

@@ -47,12 +47,13 @@ FORCE : $(obj)/$(offsets-file)
 
 ccflags-y := -Ivirt/kvm -Iarch/ia64/kvm/
 asflags-y := -Ivirt/kvm -Iarch/ia64/kvm/
+KVM := ../../../virt/kvm
 
-common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \
-		coalesced_mmio.o irq_comm.o)
+common-objs = $(KVM)/kvm_main.o $(KVM)/ioapic.o \
+		$(KVM)/coalesced_mmio.o $(KVM)/irq_comm.o
 
 ifeq ($(CONFIG_KVM_DEVICE_ASSIGNMENT),y)
-common-objs += $(addprefix ../../../virt/kvm/, assigned-dev.o iommu.o)
+common-objs += $(KVM)/assigned-dev.o $(KVM)/iommu.o
 endif
 
 kvm-objs := $(common-objs) kvm-ia64.o kvm_fw.o

arch/powerpc/kvm/Makefile

@@ -5,9 +5,10 @@
 subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
 
 ccflags-y := -Ivirt/kvm -Iarch/powerpc/kvm
+KVM := ../../../virt/kvm
 
-common-objs-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o \
-						eventfd.o)
+common-objs-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o \
+		$(KVM)/eventfd.o
 
 CFLAGS_44x_tlb.o  := -I.
 CFLAGS_e500_mmu.o := -I.
@@ -53,7 +54,7 @@ kvm-e500mc-objs := \
 kvm-objs-$(CONFIG_KVM_E500MC) := $(kvm-e500mc-objs)
 
 kvm-book3s_64-objs-$(CONFIG_KVM_BOOK3S_64_PR) := \
-	../../../virt/kvm/coalesced_mmio.o \
+	$(KVM)/coalesced_mmio.o \
 	fpu.o \
 	book3s_paired_singles.o \
 	book3s_pr.o \
@@ -86,8 +87,8 @@ kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
 	book3s_xics.o
 
 kvm-book3s_64-module-objs := \
-	../../../virt/kvm/kvm_main.o \
-	../../../virt/kvm/eventfd.o \
+	$(KVM)/kvm_main.o \
+	$(KVM)/eventfd.o \
 	powerpc.o \
 	emulate.o \
 	book3s.o \
@@ -111,7 +112,7 @@ kvm-book3s_32-objs := \
 kvm-objs-$(CONFIG_KVM_BOOK3S_32) := $(kvm-book3s_32-objs)
 
 kvm-objs-$(CONFIG_KVM_MPIC) += mpic.o
-kvm-objs-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(addprefix ../../../virt/kvm/, irqchip.o)
+kvm-objs-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(KVM)/irqchip.o
 
 kvm-objs := $(kvm-objs-m) $(kvm-objs-y)
 

arch/s390/kvm/Makefile

@@ -6,7 +6,8 @@
 # it under the terms of the GNU General Public License (version 2 only)
 # as published by the Free Software Foundation.
 
-common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o eventfd.o)
+KVM := ../../../virt/kvm
+common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o
 
 ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
 

arch/x86/kvm/Makefile

@@ -5,12 +5,13 @@ CFLAGS_x86.o := -I.
 CFLAGS_svm.o := -I.
 CFLAGS_vmx.o := -I.
 
-kvm-y			+= $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \
-				coalesced_mmio.o irq_comm.o eventfd.o \
-				irqchip.o)
-kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT)	+= $(addprefix ../../../virt/kvm/, \
-				assigned-dev.o iommu.o)
-kvm-$(CONFIG_KVM_ASYNC_PF)	+= $(addprefix ../../../virt/kvm/, async_pf.o)
+KVM := ../../../virt/kvm
+
+kvm-y			+= $(KVM)/kvm_main.o $(KVM)/ioapic.o \
+				$(KVM)/coalesced_mmio.o $(KVM)/irq_comm.o \
+				$(KVM)/eventfd.o $(KVM)/irqchip.o
+kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT)	+= $(KVM)/assigned-dev.o $(KVM)/iommu.o
+kvm-$(CONFIG_KVM_ASYNC_PF)	+= $(KVM)/async_pf.o
 
 kvm-y			+= x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
 			   i8254.o cpuid.o pmu.o