[PATCH 1/2] KVM: PPC: Fix compile error that occurs when CONFIG_ALTIVEC=n

[Christian Zigotzky]

I successfully compiled the latest Git kernel with this patch without enabled AltiVec for my Freescale P5020 board today. The patch works without any problems.

— Christian

Sent from my iPhone

On 13. Feb 2018, at 05:51, Paul Mackerras <paulus at ozlabs.org> wrote:

Commit accb757d798c ("KVM: Move vcpu_load to arch-specific
kvm_arch_vcpu_ioctl_run", 2017-12-04) added a "goto out"
statement and an "out:" label to kvm_arch_vcpu_ioctl_run().
Since the only "goto out" is inside a CONFIG_VSX block,
compiling with CONFIG_VSX=n gives a warning that label "out"
is defined but not used, and because arch/powerpc is compiled
with -Werror, that becomes a compile error that makes the kernel
build fail.

Merge commit 1ab03c072feb ("Merge tag 'kvm-ppc-next-4.16-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc",
2018-02-09) added a similar block of code inside a #ifdef
CONFIG_ALTIVEC, with a "goto out" statement.

In order to make the build succeed, this adds a #ifdef around the
"out:" label.  This is a minimal, ugly fix, to be replaced later
by a refactoring of the code.  Since CONFIG_VSX depends on
CONFIG_ALTIVEC, it is sufficient to use #ifdef CONFIG_ALTIVEC here.

Fixes: accb757d798c ("KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_run")
Reported-by: Christian Zigotzky <chzigotzky at xenosoft.de>
Signed-off-by: Paul Mackerras <paulus at ozlabs.org>
---
arch/powerpc/kvm/powerpc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 403e642c78f5..0083142c2f84 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -1608,7 +1608,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)

   kvm_sigset_deactivate(vcpu);

+#ifdef CONFIG_ALTIVEC
out:
+#endif
   vcpu_put(vcpu);
   return r;
}
-- 
2.11.0