linux-kernel - Re: [PATCH] io:pressure: zpa2326: remove redundant "DEBUG" ifdef

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Date:   Thu, 22 Sep 2016 18:44:57 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Gregor Boirie <gregor.boirie@...rot.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io:pressure: zpa2326: remove redundant "DEBUG" ifdef

On 22/09/16 10:42, Arnd Bergmann wrote:
> The -Wempty-body gcc warning triggers in the newly added zpa2326 driver:
> 
> drivers/iio/pressure/zpa2326.c: In function 'zpa2326_dequeue_pressure':
> drivers/iio/pressure/zpa2326.c:578:3: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
> 
> The use of an empty statement behind 'if (...)' is harmless here, but
> it shows that the dev_dbg() macro is not used correctly: when the "DEBUG"
> macro is not set, dev_dbg() already defaults to a no-operation, though
> one that lets the compiler know that the arguments are used, and lets
> it check the format string.
> 
> Fixing this also simplifies the driver.
> 
> Fixes: 03b262f2bbf4 ("iio:pressure: initial zpa2326 barometer support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixed up patch title with an extra i and applied to the togreg branch of iio.git
initially pushed out as testing for the autobuilders to play with it.

Thanks,

Jonathan
> ---
>  drivers/iio/pressure/zpa2326.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/iio/pressure/zpa2326.c b/drivers/iio/pressure/zpa2326.c
> index 19d2eb46fda6..c720c3ac0b9b 100644
> --- a/drivers/iio/pressure/zpa2326.c
> +++ b/drivers/iio/pressure/zpa2326.c
> @@ -147,12 +147,8 @@ struct zpa2326_private {
>  #define zpa2326_warn(_idev, _format, _arg...) \
>  	dev_warn(_idev->dev.parent, _format, ##_arg)
>  
> -#ifdef DEBUG
>  #define zpa2326_dbg(_idev, _format, _arg...) \
>  	dev_dbg(_idev->dev.parent, _format, ##_arg)
> -#else
> -#define zpa2326_dbg(_idev, _format, _arg...)
> -#endif
>  
>  bool zpa2326_isreg_writeable(struct device *dev, unsigned int reg)
>  {
>