Problem Description:
when loadable module support is disabled in the kernel's config, accessing
/sys/module/*/parameters/* is not possible, files in there are neither read- nor
writable.

e.g. (as root):
# cat /sys/module/dvb_core/parameters/dvbdev_debug
cat: /sys/module/dvb_core/parameters/dvbdev_debug: Permission denied
# echo 0 > /sys/module/dvb_core/parameters/dvbdev_debug
-sh: cannot create /sys/module/dvb_core/parameters/dvbdev_debug: Permission denied

# ls -lA /sys/module/dvb_core/parameters/dvbdev_debug
-rw-r--r--    1 root     root         4096 Jan  1 00:03
/sys/module/dvb_core/parameters/dvbdev_debug

(this is not particular to the smc91x driver, this works with no driver)

after adding module support to the kernel (CONFIG_MODULE=y), everything works as
expected:

# cat /sys/module/dvb_core/parameters/dvbdev_debug
0
# echo 1 > /sys/module/dvb_core/parameters/dvbdev_debug
# cat /sys/module/dvb_core/parameters/dvbdev_debug
1



Steps to reproduce:
disable module support from kernel config