Yes got it, thanks. Sorry it was a silly question. Regards Vivek -----Original Message----- From: Greg KH [mailto:greg@xxxxxxxxx] Sent: Friday, November 07, 2008 10:20 AM To: Vivek Kumar Gupta Cc: Kernel Newbies Subject: Re: Which routine does make dev file of usb char device ? On Fri, Nov 07, 2008 at 10:09:10AM +0530, Vivek Kumar Gupta wrote: > >> If it is udev, how does it determine the major and minor number of > the > >> device? > > >From the "dev" file in the sys/class/... file for the device, or from > >the uevent itself. newer versions of udev only use the uevent, and > >don't need sysfs. > > Just a small question, which newer version of kernel don't need sysfs. > Is it 2.6.26 upwards or even less than that? The kernel always needs sysfs :) Do you mean which version of udev does not need sysfs? I don't remember, sorry. > In case it does not need sysfs, so via make menuconfig can I completely > remove the support of sysfs from my kernel and also from busybox rootfs, > > Will that be fine for udev.? It all depends on what your rule files contain. Some distro's rules do read things from sysfs, so you might not be able to. But, why would you want to remove sysfs from your kernel? How much memory does it save? Are you sure it's an issue? My daughter's cell phone has sysfs and udev, it's not anything that is a big deal to have in your kernel. thanks, greg k-h -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
