linux-kernel - Re: blank filenames in /sys/modules, kernel 2.6.21

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Date:	Fri, 8 Jun 2007 11:32:32 -0700
From:	Greg KH <greg@...ah.com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>,
	Pete Zaitcev <zaitcev@...hat.com>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: blank filenames in /sys/modules, kernel 2.6.21

On Fri, Jun 08, 2007 at 02:05:22PM -0400, Robert P. J. Day wrote:
> On Fri, 8 Jun 2007, Chuck Ebbert wrote:
> 
> > We just found a file with this name in 2.6.21:
> >
> > Directory name: /sys/module/nousb/parameters
> > File name:      ""
> >
> > IOW the file has an empty name. Is this intentional?
> > It sure confuses updatedb...
> >
> > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=242715
> 
> that appears to be the result of:
> 
> $ grep -r __module_param_call *
> drivers/usb/core/usb.c:__module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444);
> include/linux/moduleparam.h:#define __module_param_call(prefix, name, set, get, arg, perm)              \
> include/linux/moduleparam.h:    __module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm)
> 
>   and from drivers/usb/core/usb.c:
> 
> /* format to disable USB on kernel command line is: nousb */
> __module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444);
> 
>   one has to wonder about the value of a macro that is invoked only
> once throughout the entire tree.

Pete added that back in December of 2005 (git-blame rocks...).  So what
has changed recently to cause this to do different things in sysfs?

Robert, what do you suggest we change this usage to look like?

thanks,

greg k-h
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