linux-kernel - Re: [PATCH 4/6] drivers: hv: vmbus: Fix checkpatch SPLIT

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Date:   Tue, 24 Nov 2020 21:54:29 -0300
From:   Matheus Castello <matheus@...tello.eng.br>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     "sashal@...nel.org" <sashal@...nel.org>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: Re: [PATCH 4/6] drivers: hv: vmbus: Fix checkpatch SPLIT_STRING

Hi Michael,

Em 11/15/2020 7:25 PM, Michael Kelley escreveu:
> From: Matheus Castello <matheus@...tello.eng.br> Sent: Sunday, November 15, 2020 11:58 AM
>>
>> Checkpatch emits WARNING: quoted string split across lines.
>> To keep the code clean and with the 80 column length indentation the
>> check and registration code for kmsg_dump_register has been transferred
>> to a new function hv_kmsg_dump_register.
>>
>> Signed-off-by: Matheus Castello <matheus@...tello.eng.br>
>> ---
>>   drivers/hv/vmbus_drv.c | 34 +++++++++++++++++++---------------
>>   1 file changed, 19 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
>> index 61d28c743263..09d8236a51cf 100644
>> --- a/drivers/hv/vmbus_drv.c
>> +++ b/drivers/hv/vmbus_drv.c
>> @@ -1387,6 +1387,23 @@ static struct kmsg_dumper hv_kmsg_dumper = {
>>   	.dump = hv_kmsg_dump,
>>   };
>>
>> +static void hv_kmsg_dump_register(void)
>> +{
>> +	int ret;
>> +
>> +	hv_panic_page = (void *)hv_alloc_hyperv_zeroed_page();
>> +	if (hv_panic_page) {
>> +		ret = kmsg_dump_register(&hv_kmsg_dumper);
>> +		if (ret) {
>> +			pr_err("Hyper-V: kmsg dump register error 0x%x\n", ret);
>> +			hv_free_hyperv_page((unsigned long)hv_panic_page);
>> +			hv_panic_page = NULL;
>> +		}
>> +	} else {
>> +		pr_err("Hyper-V: panic message page memory allocation failed");
>> +	}
>> +}
>> +
> 
> The above would be marginally better if organized as follows so that the
> main execution path isn't in an "if" clause.  Also reduces indentation.
> 
> 	hv_panic_page = (void *)hv_alloc_hyperv_zeroed_page();
> 	if (!hv_panic_page) {
> 		pr_err("Hyper-V: panic message page memory allocation failed");
> 		return;
> 	}
> 	ret = kmsg_dump_register(&hv_kmsg_dumper);
> 	if (ret) {
> 		pr_err("Hyper-V: kmsg dump register error 0x%x\n", ret);
> 		hv_free_hyperv_page((unsigned long)hv_panic_page);
> 		hv_panic_page = NULL;
> 	}
> 
> 

Thanks for the review, great I will use it on the v2.

>>   static struct ctl_table_header *hv_ctl_table_hdr;
>>
>>   /*
>> @@ -1477,21 +1494,8 @@ static int vmbus_bus_init(void)
>>   		 * capability is supported by the hypervisor.
>>   		 */
>>   		hv_get_crash_ctl(hyperv_crash_ctl);
>> -		if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG) {
>> -			hv_panic_page = (void *)hv_alloc_hyperv_zeroed_page();
>> -			if (hv_panic_page) {
>> -				ret = kmsg_dump_register(&hv_kmsg_dumper);
>> -				if (ret) {
>> -					pr_err("Hyper-V: kmsg dump register "
>> -						"error 0x%x\n", ret);
>> -					hv_free_hyperv_page(
>> -					    (unsigned long)hv_panic_page);
>> -					hv_panic_page = NULL;
>> -				}
>> -			} else
>> -				pr_err("Hyper-V: panic message page memory "
>> -					"allocation failed");
>> -		}
>> +		if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG)
>> +			hv_kmsg_dump_register();
>>
>>   		register_die_notifier(&hyperv_die_block);
>>   	}
>> --
>> 2.28.0
>