linux-kernel - Re: [PATCH v2] dmaengine: idxd: Remove redundant memset() for eventlog allocation

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Message-ID: <488969be-2e96-2bf4-974e-1bb5e7bedcd8@intel.com>
Date:   Tue, 29 Aug 2023 11:11:33 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     <coolrrsh@...il.com>, <fenghua.yu@...el.com>, <vkoul@...nel.org>,
        <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-kernel-mentees@...ts.linuxfoundation.org>
Subject: Re: [PATCH v2] dmaengine: idxd: Remove redundant memset() for
 eventlog allocation



On 8/29/23 11:00, coolrrsh@...il.com wrote:
> From: Rajeshwar R Shinde <coolrrsh@...il.com>
> 
> dma_alloc_coherent function already zeroes the array 'addr'.
> So, memset function call is not needed.
> 
> This fixes warning such as:
> drivers/dma/idxd/device.c:783:8-26:
> WARNING: dma_alloc_coherent used in addr already zeroes out memory,
> so memset is not needed.
> 
> Signed-off-by: Rajeshwar R Shinde <coolrrsh@...il.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>

> ---
> v1->v2
> Renamed the subject line
> ---
>   drivers/dma/idxd/device.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
> index 5abbcc61c528..7c74bc60f582 100644
> --- a/drivers/dma/idxd/device.c
> +++ b/drivers/dma/idxd/device.c
> @@ -786,8 +786,6 @@ static int idxd_device_evl_setup(struct idxd_device *idxd)
>   		goto err_alloc;
>   	}
>   
> -	memset(addr, 0, size);
> -
>   	spin_lock(&evl->lock);
>   	evl->log = addr;
>   	evl->dma = dma_addr;