Linux Kernel Module - Creating proc file - proc_root undeclared error

Posted by Zach on Stack Overflow See other posts from Stack Overflow or by Zach
Published on 2010-03-28T02:49:18Z Indexed on 2010/03/28 2:53 UTC
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kernel-programming

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linux-kernel

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kernel-module

I copy and paste code from this URL for creating and reading/writing a proc file using a kernel module and get the error that proc_root is undeclared. This same example is on a few sites so I assume it works. Any ideas why I'd get this error? Does my makefile need something different. Below is my makefile as well:

Example code for a basic proc file creation (direct copy and paste to get initial test done): http://tldp.org/LDP/lkmpg/2.6/html/lkmpg.html#AEN769

Makefile I'm using:

obj-m := counter.o

KDIR := /MY/LINUX/SRC

PWD := $(shell pwd)

default: $(MAKE) ARCH=um -C $(KDIR) SUBDIRS=$(PWD) modules

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