linux-kernel - Re: [PATCH v2 3/6] KVM: introduce kvm_for_each

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Message-ID: <4EC8E2D3.1080804@redhat.com>
Date:	Sun, 20 Nov 2011 13:21:55 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] KVM: introduce kvm_for_each_memslot macro

On 11/18/2011 11:18 AM, Xiao Guangrong wrote:
> index bb8728e..10524c0 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -307,6 +307,10 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
>  	     (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
>  	     idx++)
>
> +#define kvm_for_each_memslot(slots, memslot, i)	\
> +	for (i = 0; i < (slots)->nmemslots &&	\
> +	      ({ memslot = &(slots)->memslots[i]; 1; }); i++)
> +
>

Statement expression not needed, you can use the comma operator:

  i < (slots)->nmemslots && (memslot = @(slots)->memslots[i], true)

or even

  memslot = &(slots)->memslots[i], i < (slots)->nmemslots

or just kill i and make memslot the loop variable.

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

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