linux-kernel - Re: [PATCH 2/2] ARM: dma-mapping: fix leak in consistent

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Message-ID: <20120217131247.GN27825@n2100.arm.linux.org.uk>
Date:	Fri, 17 Feb 2012 13:12:47 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ajeet Yadav <ajeet.yadav.77@...il.com>
Cc:	Jon Medhurst <tixy@...t.co.uk>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Sumit Bhattacharya <sumitb@...dia.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dma-mapping: fix leak in consistent_init

On Fri, Feb 17, 2012 at 06:39:55PM +0530, Ajeet Yadav wrote:
> Although the error in this case is unlikely, but logically
> if error occurs then we leak memory.
> 
> Signed-off-by: Ajeet Yadav <ajeet.yadav.77@...il.com>
> ---
>  arch/arm/mm/dma-mapping.c |   24 ++++++++++++------------
>  1 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 04bfa76..b8cf062 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -161,7 +161,6 @@ static struct arm_vmregion_head consistent_head = {
>   */
>  static int __init consistent_init(void)
>  {
> -	int ret = 0;
>  	pgd_t *pgd;
>  	pud_t *pud;
>  	pmd_t *pmd;
> @@ -171,7 +170,7 @@ static int __init consistent_init(void)
>  	unsigned long num_ptes = (CONSISTENT_END - base) >> PMD_SHIFT;
>  
>  	consistent_pte = kmalloc(num_ptes * sizeof(pte_t *), GFP_KERNEL);
> -	if (!consistent_pte) {
> +	if (unlikely(!consistent_pte)) {

Please get rid of these unlikelys.  This really isn't a performance
critical path.
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