linux-kernel - Re: [PATCH] drm/amdkfd: Replace zero-length array with flexible-array member

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Date:   Tue, 15 Feb 2022 19:01:16 -0500
From:   Felix Kuehling <felix.kuehling@....com>
To:     cgel.zte@...il.com
Cc:     airlied@...ux.ie, Zeal Robot <zealci@....com.cn>,
        Xinhui.Pan@....com, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org,
        Changcheng Deng <deng.changcheng@....com.cn>,
        dri-devel@...ts.freedesktop.org, alexander.deucher@....com,
        christian.koenig@....com
Subject: Re: [PATCH] drm/amdkfd: Replace zero-length array with flexible-array
 member


On 2022-02-15 04:11, cgel.zte@...il.com wrote:
> From: Changcheng Deng <deng.changcheng@....com.cn>
>
> There is a regular need in the kernel to provide a way to declare having
> a dynamically sized set of trailing elements in a structure. Kernel code
> should always use "flexible array members" for these cases. The older
> style of one-element or zero-length arrays should no longer be used.
> Reference:
> https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
>
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Changcheng Deng <deng.changcheng@....com.cn>

Makes sense. I'm applying this patch to amd-staging-drm-next.

I also found a similar issue in include/uapi/linux/kfd_ioctl.h. I'll 
send another patch to fix that as well.

Regards,
   Felix


> ---
>   drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index e54a52785690..7d39191d13f6 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -1084,7 +1084,7 @@ struct kfd_criu_svm_range_priv_data {
>   	uint64_t start_addr;
>   	uint64_t size;
>   	/* Variable length array of attributes */
> -	struct kfd_ioctl_svm_attribute attrs[0];
> +	struct kfd_ioctl_svm_attribute attrs[];
>   };
>   
>   struct kfd_criu_queue_priv_data {