On Tue, Mar 12, 2013 at 12:14 PM, Sagar Padhye <sgr.m....@gmail.com> wrote:
> Hi > Hi, > I have successfully created a dummy procfile with read/write calls. I know > this is old way of coding & I should use sysfs, but still I did it. > When I compile this thing as module it works fine - proc file is created, > read & write works. > Then I thought of playing around a bit - I kept my code in > linux-x.x.x/drivers/sagar dir. Added an entry - > > obj-y += sagar/ > to makefile of drivers dir. Added following makefile to drivers/sagar dir > -> > $ car /path/to/linux/src/drivers/sagar/Makefile > obj-y += procfs-2.o > $ > > compiled linux the usual way -> clean, mrproper, bzImage, modules, > modules_install, copy bzImage to /boot & update-grub (ubuntu) and rebooted > into new kernel. > > It looks like, the /proc file I was expecting is not created, so I think > init_module is not called when we link the code statically to the kernel - > I thought this function would be called by the `init` process. But looks > like my assumption was wrong. I got none of my printk (INFO) logs in dmesg > just after startup. > > When I do cat /proc/kallsyms , I can find my variables & functions in there > as follows > ... > ffffffff81436800 T cleanup_module > ffffffff81436830 T init_module > ffffffff814368d0 T procfile_write > ffffffff81436910 T procfile_read > > ... > ffffffff819e22c0 b procfs_buffer_size > ffffffff819e22c8 b my_proc_file > ffffffff819e22e0 b procfs_buffer > ... > > Still the /proc file I was expecting is not there. Can somebody point me to > right ans? > > First check if your module is able to create a file in /proc, by loading it dynamically. module_init for all built-in kernle modules get called during kernel initialization....see thread here for more understanding.... http://stackoverflow.com/questions/10368837/how-does-linux-determine-the-order-of-module-init-calls - Kiran > Kernel used - 2.6.32.60 > > Note : I have started reading 'http://lwn.net/Kernel/LDD3/' as pointed by > Prashant, but I am just dying to get this working. :P > _______________________________________ > Pune GNU/Linux Users Group Mailing List > <http://www.geocities.ws/kirandivekar/> _______________________________________ Pune GNU/Linux Users Group Mailing List
