linux-kernel - Re: [PATCH] dmaengine: idxd: No need to clear memory after a dma_alloc

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Message-ID: <c2b5dd7c-9aed-e72c-9685-66680885583b@intel.com>
Date:   Tue, 30 May 2023 08:36:43 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vinod Koul <vkoul@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        <dmaengine@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: idxd: No need to clear memory after a
 dma_alloc_coherent() call


On 5/28/23 07:11, Christophe JAILLET wrote:
> dma_alloc_coherent() already clear the allocated memory, there is no need
> to explicitly call memset().
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Acked-by: Dave Jiang <dave.jiang@...el.com>
> ---
>   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;