linux-kernel - Re: [PATCH] kvm: fix irqfd build failure discovered in linux-next

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Message-ID: <4A1552B1.3040502@redhat.com>
Date:	Thu, 21 May 2009 16:10:09 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gregory Haskins <ghaskins@...ell.com>
CC:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	sfr@...b.auug.org.au, kvm@...r.kernel.org
Subject: Re: [PATCH] kvm: fix irqfd build failure discovered in linux-next

Gregory Haskins wrote:
> Stephen Rothwell noted a build failure in arch != x86 in last nights
> linux-next tree, as noted here:
>
> http://lkml.org/lkml/2009/5/21/32
>
> This patch corrects the build issue by requiring explicit support for
> IRQFD to be defined, and only defining it on x86 (the only arch fully
> supported).  The code itself isnt architecture dependent, but we need
> to add a new file to each makefile, advertise the capability, and
> of course, test that it works for each supported arch.  We will submit
> patches against each relevant arch at a later time to enable support
> there as well.
>
> Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
> ---
>
>  arch/x86/kvm/Makefile    |    1 +
>  include/linux/kvm_host.h |   17 +++++++++++++++++
>  virt/kvm/eventfd.c       |    6 ++++++
>  virt/kvm/kvm_main.c      |    2 +-
>  4 files changed, 25 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
> index 01e3c61..e5ce95e 100644
> --- a/arch/x86/kvm/Makefile
> +++ b/arch/x86/kvm/Makefile
> @@ -1,5 +1,6 @@
>  
>  EXTRA_CFLAGS += -Ivirt/kvm -Iarch/x86/kvm
> +EXTRA_CFLAGS += -DKVM_HAVE_EVENTFD
>  
>   

The standard idiom for this is to use a Kconfig symbol; see for example 
HAVE_KVM_IRQCHIP in arch/*/kvm/Kconfig.


-- 
error compiling committee.c: too many arguments to function

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