linux-kernel - Re: [PATCH 04/21] ARM: kvm: define KVM_ARM_MAX

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Date:	Tue, 23 Apr 2013 10:29:11 -0700
From:	Christoffer Dall <cdall@...columbia.edu>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>
Subject: Re: [PATCH 04/21] ARM: kvm: define KVM_ARM_MAX_VCPUS unconditionally

On Tue, Apr 23, 2013 at 9:30 AM, Arnd Bergmann <arnd@...db.de> wrote:
> The CONFIG_KVM_ARM_MAX_VCPUS symbol is needed in order to build the
> kernel/context_tracking.c code, which includes the vgic data structures
> implictly through the kvm headers. Definining the symbol to zero
> on builds without KVM resolves this build error:
>
> In file included from include/linux/kvm_host.h:33:0,
>                  from kernel/context_tracking.c:18:
> arch/arm/include/asm/kvm_host.h:28:23: warning: "CONFIG_KVM_ARM_MAX_VCPUS" is not defined [-Wundef]
>  #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
>                        ^
> arch/arm/include/asm/kvm_vgic.h:34:24: note: in expansion of macro 'KVM_MAX_VCPUS'
>  #define VGIC_MAX_CPUS  KVM_MAX_VCPUS
>                         ^
> arch/arm/include/asm/kvm_vgic.h:38:6: note: in expansion of macro 'VGIC_MAX_CPUS'
>  #if (VGIC_MAX_CPUS > 8)
>       ^
> In file included from arch/arm/include/asm/kvm_host.h:41:0,
>                  from include/linux/kvm_host.h:33,
>                  from kernel/context_tracking.c:18:
> arch/arm/include/asm/kvm_vgic.h:59:11: error: 'CONFIG_KVM_ARM_MAX_VCPUS' undeclared here (not in a function)
>   } percpu[VGIC_MAX_CPUS];
>            ^
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Christoffer Dall <cdall@...columbia.edu>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  arch/arm/kvm/Kconfig | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
> index 49dd64e..370e1a8 100644
> --- a/arch/arm/kvm/Kconfig
> +++ b/arch/arm/kvm/Kconfig
> @@ -41,9 +41,9 @@ config KVM_ARM_HOST
>           Provides host support for ARM processors.
>
>  config KVM_ARM_MAX_VCPUS
> -       int "Number maximum supported virtual CPUs per VM"
> -       depends on KVM_ARM_HOST
> -       default 4
> +       int "Number maximum supported virtual CPUs per VM" if KVM_ARM_HOST
> +       default 4 if KVM_ARM_HOST
> +       default 0
>         help
>           Static number of max supported virtual CPUs per VM.
>
> --
> 1.8.1.2
>

Acked-by: Christoffer Dall <cdall@...columbia.edu>
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