Hello, While working with the 2.4.10 kernel, I wanted to export a function that I added. I found that EXPORT_SYMBOL(..) alone does not help if CONFIG_MODVERSIONS is set. I also didn't find any document that explains how to make a kernel symbol available to modules. Below is the list of steps that I followed - after some trial and error. Can someone please verify this? HOWTO export a kernel symbol to modules --------------------------------------- Steps to make a symbol 'my_function' (defined in my_obj.c) available to kernel modules: 1. Include the following two files in the source file (my_obj.c) : linux/module.h and linux/modsetver.h 2. Add the following line to the source file: EXPORT_SYMBOL(my_function); 3. Add the object filename to the 'export-objs' variable in the current directory's Makefile. If the variable does not exist, add it: export_objs := my_obj.o 3a. If the changes you are making are enabled/disabled by a config option, you can conditionally modify export-objs : #ifdef CONFIG_MY_OPTION export-objs += my_obj.o #endif IMPORTANT: Make sure that your file name does not clash with any of the existing files in include/linux/modules. For example, if a file 'my_obj.ver' already exists in include/linux/modules, you have to rename your file (or move only the EXPORT_SYMBOL and related parts to a different file). --------------------------- -Thanks, Ravi. __________________________________________________ Do You Yahoo!? Send FREE Valentine eCards with Yahoo! Greetings! http://greetings.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
