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

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Date:	Fri, 8 Jun 2007 14:05:22 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Chuck Ebbert <cebbert@...hat.com>
cc:	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>
Subject: Re: blank filenames in /sys/modules, kernel 2.6.21

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.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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