linux-kernel - Re: [PATCH] kvm: Fix build error caused by redefinition

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Date:	Mon, 21 Mar 2016 15:04:24 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Pranith Kumar <bobby.prani@...il.com>,
	Gleb Natapov <gleb@...nel.org>,
	"open list:KERNEL VIRTUAL MACHINE (KVM)" <kvm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kvm: Fix build error caused by redefinition



On 19/03/2016 05:54, Pranith Kumar wrote:
> Build on 32-bit PPC fails with the following error:
> 
>  int kvm_vfio_ops_init(void)
>       ^
>  In file included from arch/powerpc/kvm/../../../virt/kvm/vfio.c:21:0:
>  arch/powerpc/kvm/../../../virt/kvm/vfio.h:8:90: note: previous definition of ‘kvm_vfio_ops_init’ was here
>  arch/powerpc/kvm/../../../virt/kvm/vfio.c:292:6: error: redefinition of ‘kvm_vfio_ops_exit’
>  void kvm_vfio_ops_exit(void)
>              ^
>  In file included from arch/powerpc/kvm/../../../virt/kvm/vfio.c:21:0:
>  arch/powerpc/kvm/../../../virt/kvm/vfio.h:12:91: note: previous definition of ‘kvm_vfio_ops_exit’ was here
>  scripts/Makefile.build:258: recipe for target 'arch/powerpc/kvm/../../../virt/kvm/vfio.o' failed
>  make[3]: *** [arch/powerpc/kvm/../../../virt/kvm/vfio.o] Error 1
> 
> Fix it by enclosing the definitions within CONFIG_KVM_VFIO

Please test this instead:

diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 7f7b6d86ac73..eba0bea6e032 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -8,7 +8,8 @@ ccflags-y := -Ivirt/kvm -Iarch/powerpc/kvm
 KVM := ../../../virt/kvm

 common-objs-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o \
-		$(KVM)/eventfd.o $(KVM)/vfio.o
+		$(KVM)/eventfd.o
+common-objs-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o

 CFLAGS_e500_mmu.o := -I.
 CFLAGS_e500_mmu_host.o := -I.


Paolo