linux-kernel - Re: [PATCH] KVM: remove redundant NULL tests

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Date:	Sat, 16 Jan 2010 13:29:05 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Roel Kluin <roel.kluin@...il.com>
CC:	Xiantao Zhang <xiantao.zhang@...el.com>, kvm-ia64@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: remove redundant NULL tests

Roel Kluin wrote:
> kvm_get_exit_data() cannot return a NULL pointer.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
>  arch/ia64/kvm/kvm_fw.c |   28 +++++++++++++---------------
>  1 files changed, 13 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/ia64/kvm/kvm_fw.c b/arch/ia64/kvm/kvm_fw.c
> index e4b8231..cb548ee 100644
> --- a/arch/ia64/kvm/kvm_fw.c
> +++ b/arch/ia64/kvm/kvm_fw.c
> @@ -75,7 +75,7 @@ static void set_pal_result(struct kvm_vcpu *vcpu,
>  	struct exit_ctl_data *p;
>  
>  	p = kvm_get_exit_data(vcpu);
> -	if (p && p->exit_reason == EXIT_REASON_PAL_CALL) {
> +	if (p->exit_reason == EXIT_REASON_PAL_CALL) {
>  		p->u.pal_data.ret = result;
>  		return ;
>  	}
	[___etc___]

Clearly the original author thought that there was a path where kvm_exit_data 
could return a NULL pointer, was that ever possible?

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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