linux-kernel - Re: [PATCH V3 2/5] Package Level Thermal Control and Power Limit Notification: pkgtemp hwmon driver

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Date:	Fri, 30 Jul 2010 18:13:39 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Fenghua Yu <fenghua.yu@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>,
	Chen Gong <gong.chen@...ux.intel.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Huaxu Wan <huaxu.wan@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors <lm-sensors@...sensors.org>
Subject: Re: [PATCH V3 2/5] Package Level Thermal Control and Power Limit
 Notification: pkgtemp hwmon driver

On Fri, Jul 30, 2010 at 08:57:56PM -0400, H. Peter Anvin wrote:
> On 07/29/2010 05:13 PM, Fenghua Yu wrote:
> > +
> > +enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, SHOW_NAME } SHOW;
> > +
> 
> This conflicts with an equally poorly named global variable in
> drivers/hwmon/via-cputemp.c, and the conflict is causing a build failure.
> 
> I think both these drivers have the same bug: a missing "typedef" before
> the enum keyword, as present in coretemp.c.  Of course, one can question
> if it should be given a typename at all since in none of these drivers

Especially since it isn't really a type name, but a global variable named SHOW.
Type name (also called tag) would be enum SHOW { ... }; . 

Guenter

> they are actually referenced by type, and instead the enumeration is
> just used as a source of constants, which can perfectly well be handled
> with an unnamed enum:
> 
> enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, SHOW_NAME };
> 
> 	-hpa
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