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Subjectlinux-next: kvm/powerpc tree build failure
Hi Avi, Ben,

Today's linux-next build (powerpc ppc44x_defconfig) failed like this:

cc1: warnings being treated as errors
arch/powerpc/kvm/../../../virt/kvm/kvm_main.c: In function '__kvm_set_memory_region':
arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:1178: error: integer overflow in expression

Probably caused by commit ac04527f7947020c5890090b2ac87af4e98d977e ("KVM:
Disable large pages on misaligned memory slots"). The build fails because
arch/powerpc is now being built (mostly) with -Werror.

arch/powerpc/include/asm/kvm_host.h:#define KVM_PAGES_PER_HPAGE (1<<31)

this needs to be (1UL << 31) or ((unsigned int)1 << 31).

I applied the following patch for today.

From: Stephen Rothwell <>
Date: Wed, 17 Jun 2009 14:57:29 +1000
Subject: [PATCH] kvm/powerpc: make 32 bit constant unsigned long

KVM_PAGES_PER_HPAGE needs to be unsigned long since its value is 2^31.

Eliminates this compiler warning:

arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:1178: error: integer overflow in expression

Signed-off-by: Stephen Rothwell <>
arch/powerpc/include/asm/kvm_host.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 3625424..d4caa61 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -34,7 +34,7 @@

/* We don't currently support large pages. */
-#define KVM_PAGES_PER_HPAGE (1<<31)
+#define KVM_PAGES_PER_HPAGE (1UL << 31)

struct kvm;
struct kvm_run;
Stephen Rothwell

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