Hi all, I've a problem with the kernel module I'm developing. I need to do a fork of a process p and I think to duplicate the do_fork system call (kernel/fork.c). To do this I've copied the whole fork.c files in a header file CMC_fork.h and changed the function parameters adding a struct task_struct parameter in each function that use the current pointer. Then I've replaced current with the p pointer. I've no problem in compiling the module (that includes the CMC_fork.h header just created), but insmod returns the error: ./thread_module.o: unresolved symbol swapper_pg_dir Note that there's no direct reference to swapper_pd_dir in my module or in CMC_fork.h (and therefore in kernel/fork.c). The headers included by CMC_fork.h are the same included by kernel/fork.c: #include <linux/config.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/unistd.h> #include <linux/smp_lock.h> #include <linux/module.h> #include <linux/vmalloc.h> #include <linux/completion.h> #include <linux/personality.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/uaccess.h> #include <asm/mmu_context.h> I've tried to declare extern pgd_t swapper_pg_dir[1024]; as in asm/pgtable.h (line 24). But insmod returns the same error. I've also tried to declare extern pgd_t *swapper_pg_dir; but the error /usr/src/linux/include/asm/pgtable.h:24: previous declaration of `swapper_pg_dir' is returned. This error is also returned if I declare pgd_t *swapper_pg_dir = (pgd_t *) 0xc0101000; How can I resolve this problem? Thanks all. Vincenzo Mallozzi. ___________________________________ Nuovo Yahoo! Messenger: E' molto più divertente: Audibles, Avatar, Webcam, Giochi, Rubrica? Scaricalo ora! http://it.messenger.yahoo.it -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
