linux-kernel - Re: [PATCH] drm: amd: Use kmemdup instead of duplicating its function

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Message-ID: <5BA4FC75.7040902@huawei.com>
Date:   Fri, 21 Sep 2018 22:13:09 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <airlied@...ux.ie>, <alexander.deucher@....com>
CC:     <oded.gabbay@...il.com>, <christian.koenig@....com>,
        <David1.Zhou@....com>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <amd-gfx@...ts.freedesktop.org>,
        "Harry Wentland" <harry.wentland@....com>
Subject: Re: [PATCH] drm: amd: Use kmemdup instead of duplicating its function

+cc  amd-gfx@...ts.freedesktop.org

Thanks,
zhong jiang

On 2018/9/18 23:35, zhong jiang wrote:
> kmemdup has implemented the function that kmalloc() + memcpy().
> We prefer to kmemdup rather than code opened implementation.
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
> index ee49960..8ddd585 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
> @@ -747,12 +747,10 @@ int kfd_create_crat_image_acpi(void **crat_image, size_t *size)
>  		return -ENODATA;
>  	}
>  
> -	pcrat_image = kmalloc(crat_table->length, GFP_KERNEL);
> +	pcrat_image = kmemdup(crat_table, crat_table->length, GFP_KERNEL);
>  	if (!pcrat_image)
>  		return -ENOMEM;
>  
> -	memcpy(pcrat_image, crat_table, crat_table->length);
> -
>  	*crat_image = pcrat_image;
>  	*size = crat_table->length;
>