linux-kernel - Re: [PATCH v3 1/4] dev_printk: add new dev_err

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Date: Mon, 17 Jun 2024 20:41:53 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Nuno Sa <nuno.sa@...log.com>
Cc: Petr Mladek <pmladek@...e.com>, Lars-Peter Clausen <lars@...afoo.de>,
 Olivier Moysan <olivier.moysan@...s.st.com>, Jyoti Bhayana
 <jbhayana@...gle.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Chris Down <chris@...isdown.name>, John Ogness <john.ogness@...utronix.de>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andi Shyti
 <andi.shyti@...nel.org>, <linux-kernel@...r.kernel.org>,
 <linux-iio@...r.kernel.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Andrzej Hajda <a.hajda@...sung.com>, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v3 1/4] dev_printk: add new dev_err_probe() helpers

On Sat, 8 Jun 2024 19:07:48 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Thu, 6 Jun 2024 09:22:37 +0200
> Nuno Sa <nuno.sa@...log.com> wrote:
> 
> > This is similar to dev_err_probe() but for cases where an ERR_PTR() or
> > ERR_CAST() is to be returned simplifying patterns like:
> > 
> > 	dev_err_probe(dev, ret, ...);
> > 	return ERR_PTR(ret)
> > or
> > 	dev_err_probe(dev, PTR_ERR(ptr), ...);
> > 	return ERR_CAST(ptr)
> > 
> > Signed-off-by: Nuno Sa <nuno.sa@...log.com>  
> 
> I'm convinced this is worth doing but would like inputs from others
> before I pick this series up.

Andi and Andy,

You both commented on earlier versions.  Do you think this is a good
change set?

I've +CC a few more based on a quick look at the original
dev_err_probe() series. Whilst this isn't adding a bunch of new stuff
around deferred probing (like that series did), maybe some of those
reviewers will give opinions here?

Jonathan

> 
> Jonathan
> 
> > ---
> >  include/linux/dev_printk.h | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/include/linux/dev_printk.h b/include/linux/dev_printk.h
> > index ae80a303c216..ca32b5bb28eb 100644
> > --- a/include/linux/dev_printk.h
> > +++ b/include/linux/dev_printk.h
> > @@ -277,4 +277,12 @@ do {									\
> >  
> >  __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
> >  
> > +/* Simple helper for dev_err_probe() when ERR_PTR() is to be returned. */
> > +#define dev_err_ptr_probe(dev, ___err, fmt, ...) \
> > +	ERR_PTR(dev_err_probe(dev, ___err, fmt, ##__VA_ARGS__))
> > +
> > +/* Simple helper for dev_err_probe() when ERR_CAST() is to be returned. */
> > +#define dev_err_cast_probe(dev, ___err_ptr, fmt, ...) \
> > +	ERR_PTR(dev_err_probe(dev, PTR_ERR(___err_ptr), fmt, ##__VA_ARGS__))
> > +
> >  #endif /* _DEVICE_PRINTK_H_ */
> >   
> 
>