linux-kernel - Re: [PATCH] staging: greybus: eclose macro in a do

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Date:   Sat, 11 Mar 2023 16:54:32 +0200
From:   Menna Mahmoud <eng.mennamahmoud.mm@...il.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     outreachy@...ts.linux.dev, pure.logic@...us-software.ie,
        johan@...nel.org, elder@...nel.org, gregkh@...uxfoundation.org,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: eclose macro in a do - while loop


On ١١‏/٣‏/٢٠٢٣ ١٦:٣٦, Julia Lawall wrote:
> Menna,
>
> There is a typo in the subject line.
>
> On Sat, 11 Mar 2023, Menna Mahmoud wrote:
>
>> " ERROR: Macros with multiple statements should be enclosed in a do -
>> while loop"
>>
>> Reported by checkpath.
>>
>> do loop with the conditional expression set to a constant
>> value of zero (0).This creates a loop that
>> will execute exactly one time.This is a coding idiom that
>> allows a multi-line macro to be used anywhere
>> that a single statement can be used.
>>
>> So, enclose `gb_loopback_stats_attrs` macro in do - while (0) to
>> fix checkpath error
> The log message should focus on what is done and why.  The checkpatch
> warning text and the fact that the problem was detected using checkpatch
> is useful, but less, so it should come last, not first.
>
> Here, what is done is to enclose a sequence of statements in a macro
> definition in a do-while loop with a test expression 0.
>
> The reason why is to make it safe to use the sequence anywhere a single
> statement can be used.
>
> A period at the end of a sentence should be followed by some whitespace
> before starting the next sentence.
>
> julia


got it, thank you.


Menna

>
>> Signed-off-by: Menna Mahmoud <eng.mennamahmoud.mm@...il.com>
>> ---
>>   drivers/staging/greybus/loopback.c | 10 ++++++----
>>   1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
>> index 1a61fce98056..e86d50638cb5 100644
>> --- a/drivers/staging/greybus/loopback.c
>> +++ b/drivers/staging/greybus/loopback.c
>> @@ -162,10 +162,12 @@ 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)
>> +#define gb_loopback_stats_attrs(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,				\
>> --
>> 2.34.1
>>
>>
>>