linux-kernel - Re: [PATCH] KVM-async_pf: Delete an unnecessary check before the function call "kmem_cache

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Message-ID: <564C5B22.6010809@redhat.com>
Date:	Wed, 18 Nov 2015 12:04:02 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	Gleb Natapov <gleb@...nel.org>
Cc:	kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] KVM-async_pf: Delete an unnecessary check before the
 function call "kmem_cache_destroy"



On 15/11/2015 10:45, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 15 Nov 2015 10:40:36 +0100
> 
> The kmem_cache_destroy() function tests whether its argument is NULL
> and then returns immediately. Thus the test around the call is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  virt/kvm/async_pf.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
> index 77d42be..3531599 100644
> --- a/virt/kvm/async_pf.c
> +++ b/virt/kvm/async_pf.c
> @@ -57,8 +57,7 @@ int kvm_async_pf_init(void)
>  
>  void kvm_async_pf_deinit(void)
>  {
> -	if (async_pf_cache)
> -		kmem_cache_destroy(async_pf_cache);
> +	kmem_cache_destroy(async_pf_cache);
>  	async_pf_cache = NULL;
>  }
>  
> 

Applied to kvm/queue, thanks.

Paolo
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