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

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Date:   Thu, 10 Feb 2022 10:37:14 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     Shuah Khan <skhan@...uxfoundation.org>
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
Subject: Re: [PATCH] usbip: vudc: Make use of the helper macro LIST_HEAD()

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',
> 
> LIST_HEAD_INIT clearly states what it does, as a result it is easier
> to understand the code.
LIST_HEAD() is defined for 17 years, lots of drivers use it
directly. It's not about code readability.

Thanks,
Cai
> 
> thanks,
> -- Shuah