linux-kernel - Re: [PATCH v2 1/4] dev_printk: add new dev_err

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Date: Thu, 02 May 2024 13:34:23 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, nuno.sa@...log.com
Cc: Petr Mladek <pmladek@...e.com>, Chris Down <chris@...isdown.name>, John
 Ogness <john.ogness@...utronix.de>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>,  Jonathan Cameron <jic23@...nel.org>,
 Lars-Peter Clausen <lars@...afoo.de>, Olivier Moysan
 <olivier.moysan@...s.st.com>, Andi Shyti <andi.shyti@...nel.org>, Jyoti
 Bhayana <jbhayana@...gle.com>, linux-kernel@...r.kernel.org,
 linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dev_printk: add new dev_err_probe() helpers

On Tue, 2024-04-23 at 18:31 +0300, Andy Shevchenko wrote:
> On Tue, Apr 23, 2024 at 05:20:30PM +0200, Nuno Sa via B4 Relay wrote:
> > From: Nuno Sa <nuno.sa@...log.com>
> > 
> > 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)
> 
> ...
> 
> > +/* 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__));	\
> > +})
> 
> Why ; and hence why ({}) ?
> 
> I even believe the compiler may warn if you have double ;; in some cases.
> 

Oh yes, no need for any of those...

- Nuno Sá