linux-kernel - Re: [PATCH 4/9v2] usb: host: ehci.h: fix single statement macros

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Message-ID: <CAGG-pURcZp1v5L9RGE5X-6wXHdPbBw=NpCg54C9Q8YKcwaH_xg@mail.gmail.com>
Date:	Thu, 10 Dec 2015 09:20:13 -0300
From:	"Geyslan G. Bem" <geyslan@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Peter Senna Tschudin <peter.senna@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9v2] usb: host: ehci.h: fix single statement macros

2015-12-10 8:54 GMT-03:00 Sergei Shtylyov <sergei.shtylyov@...entembedded.com>:
> Hello.
>
> On 12/10/2015 1:32 AM, Geyslan G. Bem wrote:
>
>> Don't use the 'do {} while (0)' wrapper in a single statement macro.
>>
>> Caught by checkpatch: "WARNING: Single statement macros should not
>> use a do {} while (0) loop"
>>
>> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
>> ---
>>   drivers/usb/host/ehci.h | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
>> index cfeebd8..945000a 100644
>> --- a/drivers/usb/host/ehci.h
>> +++ b/drivers/usb/host/ehci.h
>> @@ -244,9 +244,9 @@ struct ehci_hcd {                   /* one per
>> controller */
>>         /* irq statistics */
>>   #ifdef EHCI_STATS
>>         struct ehci_stats       stats;
>> -#      define COUNT(x) do { (x)++; } while (0)
>> +#      define COUNT(x) ((x)++)
>>   #else
>> -#      define COUNT(x) do {} while (0)
>> +#      define COUNT(x) ((void) 0)
>
>
>    Why not just empty #define?

Indeed. I'll change it.
Tks Sergei.


>
> [...]
>
> MBR, Sergei
>



-- 
Regards,

Geyslan G. Bem
hackingbits.com
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