linux-kernel - Re: [PATCH] staging: greybus: Clear up precedence for gcam logging macros

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Date: Thu, 4 Apr 2024 17:05:09 -0500
From: Alex Elder <elder@...e.org>
To: Jackson Chui <jacksonchui.qwerty@...il.com>,
 Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: Clear up precedence for gcam logging
 macros

On 4/3/24 7:16 PM, Jackson Chui wrote:
> Reported by checkpatch:
> 
> CHECK: Macro argument 'gcam' may be better as '(gcam)' to avoid
> precedence issues

I agree with your argument about the way the macro should be
defined.  But perhaps these gcam_*() functions could just
be eliminated?

I see 15 calls to gcam_err(), 1 call to gcam_dbg(), and none
to gcam_info().  It would be a different patch, but maybe
you could do that instead?

					-Alex


> 
> Disambiguates '&' (address-of) operator and '->' operator precedence,
> accounting for how '(gcam)->bundle->dev' is a 'struct device' and not a
> 'struct device*', which is required by the dev_{dbg,info,err} driver
> model diagnostic macros. Issue found by checkpatch.
> 
> Signed-off-by: Jackson Chui <jacksonchui.qwerty@...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 a8173aa3a995..d82a2d2abdca 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)
>   
>   static int gb_camera_operation_sync_flags(struct gb_connection *connection,
>   					  int type, unsigned int flags,