Hi Robert, The code works well on i386 box kernel-2.6.32.9,but i have problem on ARM omap , kernel-2.6.32.9 when I do nm m3.ko it show's ( U rday_3)
cat /proc/kallsyms | grep rday_3 bf011094 D rday_3 [m2] but when i do insmod it gives me unresolved symbol this bit strange,Can please share some idea on this. Regards, Hemanth --- On Fri, 10/12/10, Robert P. J. Day <rpj...@crashcourse.ca> wrote: From: Robert P. J. Day <rpj...@crashcourse.ca> Subject: Re: EXPORT_SYMBOL To: "Hemanth Kumar" <hemw...@yahoo.co.in> Cc: kernelnewbies@nl.linux.org Date: Friday, 10 December, 2010, 7:46 PM On Fri, 10 Dec 2010, Hemanth Kumar wrote: > Hi All, > > I was working with the example from > http://ldn.linuxfoundation.org/article/kernel-symbols-whats-available-your-module-what-isnt that stuff is a bit dated but, still, it should work. > I am getting the error unresolved symbol rday_3, ARCH=arm omap > kernel=2.3.32.9 > > insmod m2.ko > then > insmod m3.ko > unresolved symbol rday_3 > > then i did cat /proc/kallsyms | grep rday_3 > i can see the rday_3 in that file,But still I am unable to insmod the m3.ko can you list the full line out of /proc/kallsyms, so we can see the symbol type? > Can anybody please share some idea on this,Is anything there that's need > to be enabled in config file in > kernel,Below is the code > > file m2.c > > #include <linux/module.h> > #include <linux/init.h> > #include <linux/kernel.h> > static int rday_1 = 1; > int rday_2 = 2; > int rday_3 = 3; > EXPORT_SYMBOL(rday_3); > static int __init hi(void) > { > printk(KERN_INFO "module m2 being loaded.\n"); > return 0; > } > static void __exit bye(void) > { > printk(KERN_INFO "module m2 being unloaded.\n"); > } > module_init(hi); > module_exit(bye); > MODULE_AUTHOR("Robert P. J. Day"); > MODULE_LICENSE("GPL"); > MODULE_DESCRIPTION("Let's try some exporting."); AFAICT, that should be fine and the symbol "rday_3" should be exported to be globally visible. so far, so good, and you claim that it's listed in /proc/kallsyms. > file m3.c > #include <linux/module.h> > #include <linux/init.h> > #include <linux/kernel.h> > > extern int rday_3; > static int __init m3hi(void) > { > printk(KERN_INFO "module m2 being loaded = %d\n",rday_3); > return 0; > } > static void __exit m3bye(void) > { > > printk(KERN_INFO "module m2 being unloaded.\n"); > } > module_init(m3hi); > module_exit(m3bye); > MODULE_AUTHOR("Robert P. J. Day"); > MODULE_LICENSE("GPL"); > MODULE_DESCRIPTION("Let's try some exporting."); if "rday_3" was exported properly, i don't see why it shouldn't be visible when this module is loaded. anyone else have some thoughts on this? this clearly worked in the past. rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================
