1 #include <linux/module.h>
  2 #include <linux/kernel.h>
  3 #include <linux/init.h>
  4 #include <linux/skbuff.h>
  5 #include <trace/events/net.h>
  6
  7 static void probe(void *ignore, struct sk_buff *skb)
  8 {
  9     printk(KERN_INFO "probe, protocol[0X%04X]n", ntohs(skb->protocol));
 10 }
 11
 12 static int __init init_tracepoint(void)
 13 {
 14     if (0 != register_trace_netif_receive_skb(probe, NULL))
 15     {
 16         printk(KERN_INFO "tracepoint init failsn");
 17     }
 18
 19     printk(KERN_INFO "tracepoint init succeedsn");
 20     return 0;
 21 }
 22
 23 static void __exit cleanup_tracepoint(void)
 24 {
 25     unregister_trace_netif_receive_skb(probe, NULL);
 26     tracepoint_synchronize_unregister();
 27
 28     printk(KERN_INFO "tracepoint exitn");
 29 }
 30
 31 module_init(init_tracepoint);
 32 module_exit(cleanup_tracepoint);
 33
 34 MODULE_LICENSE("GPL");

suse11-1:~/works/tracepoint # make
make -C /lib/modules/3.0.76-0.11-default/build M=/root/works/tracepoint modules
make[1]: Entering directory `/usr/src/linux-3.0.76-0.11-obj/x86_64/default'
make -C ../../../linux-3.0.76-0.11 O=/usr/src/linux-3.0.76-0.11-obj/x86_64/default/. modules
  CC [M]  /root/works/tracepoint/tracepoint.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /root/works/tracepoint/tracepoint.mod.o
  LD [M]  /root/works/tracepoint/tracepoint.ko
make[1]: Leaving directory `/usr/src/linux-3.0.76-0.11-obj/x86_64/default'
suse11-1:~/works/tracepoint # insmod tracepoint.ko

suse12-1:~/works/codes/tracepoint # make
make -C /lib/modules/4.4.21-69-default/build M=/root/works/codes/tracepoint modules
make[1]: Entering directory '/usr/src/linux-4.4.21-69-obj/x86_64/default'
  CC [M]  /root/works/codes/tracepoint/tracepoint.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "__tracepoint_netif_receive_skb" [/root/works/codes/tracepoint/tracepoint.ko] undefined!
  CC      /root/works/codes/tracepoint/tracepoint.mod.o
  LD [M]  /root/works/codes/tracepoint/tracepoint.ko
make[1]: Leaving directory '/usr/src/linux-4.4.21-69-obj/x86_64/default'
suse12-1:~/works/codes/tracepoint #
suse12-1:~/works/codes/tracepoint # insmod tracepoint.ko
insmod: ERROR: could not insert module tracepoint.ko: Unknown symbol in module