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

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Date:	Thu, 10 Dec 2015 17:44:03 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	"Geyslan G. Bem" <geyslan@...il.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

On 12/10/2015 04:05 PM, 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.
>
> Since COUNT is not used to return the empty #define is ok. Another way
> is to use #define COUNT(x) (0) to get a 0 when necessary to read
> returns.

    Just 0, no parens please.

MBR, Sergei

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