On Thu, Aug 11, 2016 at 07:25:45PM +0000, Matt M wrote:
I am just getting started with kernel module development, and I can't get anything to compile.
I get the following errors:
In file included from main.c:1:0: /usr/src/linux/include/linux/init.h:142:13: error: expected ?=?, ?,?, ?;?, ?asm? or ?__attribute__? before ?load_default_modules? ?void __init load_default_modules(void); ? ? ? ? ? ? ?^~~~~~~~~~~~~~~~~~~~ /usr/src/linux/include/linux/init.h:143:12: error: expected ?=?, ?,?, ?;?, ?asm? or ?__attribute__? before ?init_rootfs? ?int __init init_rootfs(void); ? ? ? ? ? ? ^~~~~~~~~~~ /usr/src/linux/include/linux/init.h:285:13: error: expected ?=?, ?,?, ?;?, ?asm? or ?__attribute__? before ?parse_early_param? ?void __init parse_early_param(void); ? ? ? ? ? ? ?^~~~~~~~~~~~~~~~~ /usr/src/linux/include/linux/init.h:286:13: error: expected ?=?, ?,?, ?;?, ?asm? or ?__attribute__? before ?parse_early_options? ?void __init parse_early_options(char *cmdline);
The errors go on and on, but the majority look like that.
My code:
#include <linux/init.h> #include <linux/module.h>
int main() { return 0; }
The compile command: gcc -I /usr/src/linux/include/ main.c
That's not how you compile a Linux kernel module, sorry.
Please read the very good documentation for how to set up a Makefile for building a kernel module. It's in the kernel's Documentation/ directory.
best of luck,
greg k-h
Alternatively, try this doc on TLKD: http://www.tldp.org/LDP/lkmpg/2.6/html/lkmpg.html it's kind of outdated, but some code there still compile against the newest kernel. good luck, Ruan.