linux-kernel - Re: [PATCH] usbip: vudc: Make use of the helper macro LIST

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Date:   Thu, 10 Feb 2022 07:13:34 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Cai Huoqing <cai.huoqing@...ux.dev>
Cc:     Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] usbip: vudc: Make use of the helper macro LIST_HEAD()

On 2/9/22 7:37 PM, Cai Huoqing wrote:
> On 09 2月 22 09:00:37, Shuah Khan wrote:
>> On 2/8/22 8:28 PM, Cai Huoqing wrote:
>>> Replace "struct list_head head = LIST_HEAD_INIT(head)" with
>>> "LIST_HEAD(head)" to simplify the code.
>>>
>>> Signed-off-by: Cai Huoqing <cai.huoqing@...ux.dev>
>>> ---
>>>    drivers/usb/usbip/vudc_main.c | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/usb/usbip/vudc_main.c b/drivers/usb/usbip/vudc_main.c
>>> index 678faa82598c..d43252b77efd 100644
>>> --- a/drivers/usb/usbip/vudc_main.c
>>> +++ b/drivers/usb/usbip/vudc_main.c
>>> @@ -26,7 +26,7 @@ static struct platform_driver vudc_driver = {
>>>    	},
>>>    };
>>> -static struct list_head vudc_devices = LIST_HEAD_INIT(vudc_devices);
>>> +static LIST_HEAD(vudc_devices);
>>>    static int __init init(void)
>>>    {
>>>
>>
>> Explain why this change simplifies the code and also add a comment
>> above LIST_HEAD
> LIST_HEAD() help to clean up the code "struct list_head vudc_devices =
> ". we only to care the variable 'vudc_devices',
>>

How does LIST_HEAD() make it simpler. It does that I am sure. I am looking
for you to explain how it does in the change log.

thanks,
-- Shuah