linux-kernel - Re: [PATCH] staging: greybus: avoid macro argument precedence issues

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Date:   Sun, 22 Oct 2023 12:24:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Nandha Kumar Singaram <nandhakumar.singaram@...il.com>
Cc:     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, kumaran.4353@...il.com
Subject: Re: [PATCH] staging: greybus: avoid macro argument precedence issues

On Sat, Oct 21, 2023 at 02:48:40PM -0700, Nandha Kumar Singaram wrote:
> Adhere to linux coding style, added parentheses around
> macro argument 'gcam'.
> CHECK: Macro argument 'gcam' may be better as '(gcam)' to
> avoid precedence issues
> 
> Signed-off-by: Nandha Kumar Singaram <nandhakumar.singaram@...il.com>
> ---
>  drivers/staging/greybus/camera.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/greybus/camera.c b/drivers/staging/greybus/camera.c
> index cdbb42cd413b..ae49e37a87e9 100644
> --- a/drivers/staging/greybus/camera.c
> +++ b/drivers/staging/greybus/camera.c
> @@ -180,9 +180,9 @@ static const struct gb_camera_fmt_info *gb_camera_get_format_info(u16 gb_fmt)
>  
>  #define GB_CAMERA_MAX_SETTINGS_SIZE	8192
>  
> -#define gcam_dbg(gcam, format...)	dev_dbg(&gcam->bundle->dev, format)
> -#define gcam_info(gcam, format...)	dev_info(&gcam->bundle->dev, format)
> -#define gcam_err(gcam, format...)	dev_err(&gcam->bundle->dev, format)
> +#define gcam_dbg(gcam, format...)	dev_dbg(&(gcam)->bundle->dev, format)
> +#define gcam_info(gcam, format...)	dev_info(&(gcam)->bundle->dev, format)
> +#define gcam_err(gcam, format...)	dev_err(&(gcam)->bundle->dev, format)

Sorry, but checkpatch is wrong here, this is not a problem at all.  Look
at what you changed and think about if the macro argument could actually
be anything other than a pointer.

thanks,

greg k-h