linux-kernel - Re: [PATCH 4/6] regulator: regulator core.

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Message-Id: <20080223101843.d7c001e7.akpm@linux-foundation.org>
Date:	Sat, 23 Feb 2008 10:18:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Liam Girdwood <lg@...nsource.wolfsonmicro.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>
Subject: Re: [PATCH 4/6] regulator: regulator core.

On Sat, 23 Feb 2008 09:52:17 +0000 Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> On Sat, Feb 23, 2008 at 12:05:38AM -0800, Andrew Morton wrote:
> > On Wed, 20 Feb 2008 17:09:11 +0000 Liam Girdwood <lg@...nsource.wolfsonmicro.com> wrote:
> > 
> > > This patch provides the regulator framework core. The core also provides a
> > > sysfs interface for userspace information.
> > > 
> > > ...
> > >
> > > +
> > > +/* We need to undef the current macro (from include/asm/current.h) otherwise
> > > + * our "current" sysfs entry becomes "(get_current())".
> > > + */
> > > +#undef current
> > 
> > err, no ;)  Please rename your stuff.
> 
> Renaming is not an option - "current" is an electronic term for which
> there is no alternative.

amps, milliamps, amperage (the latter of which I've always disliked)

>  The real problem is this __ATTR macro crap:
> 
> +       __ATTR(current, 0444, regulator_uA_show, NULL),

This interface would actually be *improved* if that sysfs file were named
"microamps" rather than "current".  Because its units become
self-documenting.  Similarly, s/voltage/millivolts/g

> #define __ATTR(_name,_mode,_show,_store) { \
> 	.attr = {.name = __stringify(_name), .mode = _mode },	\
> 	.show	= _show,					\
> 	.store	= _store,					\
> }
> 
> If __ATTR allowed the name to be passed as a string, instead of stupidly
> stringifying it, then this wouldn't be needed.  So I suggest that the
> #undef stands _until_ we fix this stupid macro.

yeah, macros suck.

>  Or we rename the
> "current" macro to something that doesn't clash with accepted scientific
> and engineering terminology.
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