On Fri, Apr 05, 2024 at 02:22:05PM -0700, Jackson Chui wrote:
> On Thu, Apr 04, 2024 at 05:05:09PM -0500, Alex Elder wrote:
> > 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@xxxxxxxxx>
> > > ---
> > > 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,
> >
>
> Thanks for the feedback, Alex!
>
> I thought about refactoring it, but I feel it is worth keeping
> the macro around. It acts as an apdater between callers, who
> have 'gcam' and want to log and what the dynamic debug macros
> expect. Without it, the code gets pretty ugly.
Another idea would be to create a function:
struct device *gcam_dev(struct gb_camera *gcam)
{
return &gcam->bundle->dev;
}
dev_dbg(gcam_dev(gcam), "received metadata ...
(I don't know how to actually compile this code so I haven't tried it).
regards,
dan carpenter
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