linux-kernel - Re: [PATCH] staging: greybus: loopback: fix up checkpath macro do while error.

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Date:   Sun, 2 Apr 2023 20:22:35 +0200
From:   Ángel Alberto Carretero 
        <angelalbertoc.r@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Bryan O'Donoghue <pure.logic@...us-software.ie>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: loopback: fix up checkpath macro do
 while error.



On 02/04/2023 15:16, Greg Kroah-Hartman wrote:
> On Sun, Apr 02, 2023 at 02:25:51PM +0200, Angel Alberto Carretero wrote:
>> Wrap macro in a do-while statement.
>>
>> Signed-off-by: Angel Alberto Carretero <angelalbertoc.r@...il.com>
>> ---
>>   drivers/staging/greybus/loopback.c | 8 +++++---
>>   1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
>> index d7b39f3bb652..371809770ed0 100644
>> --- a/drivers/staging/greybus/loopback.c
>> +++ b/drivers/staging/greybus/loopback.c
>> @@ -162,9 +162,11 @@ static ssize_t name##_avg_show(struct device *dev,		\
>>   static DEVICE_ATTR_RO(name##_avg)
>>   
>>   #define gb_loopback_stats_attrs(field)				\
>> -	gb_loopback_ro_stats_attr(field, min, u);		\
>> -	gb_loopback_ro_stats_attr(field, max, u);		\
>> -	gb_loopback_ro_avg_attr(field)
>> +	do {		\
>> +		gb_loopback_ro_stats_attr(field, min, u);		\
>> +		gb_loopback_ro_stats_attr(field, max, u);		\
>> +		gb_loopback_ro_avg_attr(field);		\
>> +	} while (0)
>>   
>>   #define gb_loopback_attr(field, type)					\
>>   static ssize_t field##_show(struct device *dev,				\
>> -- 
>> 2.40.0
>>
>>
> 
> Any specific reason why you did not test build your change before
> submitting it?
> 
> thanks,
> 
> greg k-h

Apologies, we can drop the patch. I was trying to find an error as part
of the eudyptula challenge and thought I was compiling the driver
correctly. Upon further examination, the macro cannot be written with a
do-while because it is defining functions.