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

From: Robert P. J. Day
Date: Fri Jun 08 2007 - 14:08:11 EST

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...

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.

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