Re: [PATCH] 2.6.10 patch to export kallsyms_lookup_name()

[Badari Pulavarty]

On Fri, 2005-02-18 at 10:42, Christoph Hellwig wrote:
> On Fri, Feb 18, 2005 at 10:29:08AM -0800, Badari Pulavarty wrote:
> > Hi,
> > 
> > Trivial patch to export kallsyms_lookup_name() for
> > kprobe/jprobe module use.
> > 
> > Please apply. 
> > 
> > (BTW, I personally don't care if it should be
> > EXPORT_SYMBOL_GPL or EXPORT_SYMBOL).
> 
> Certainly should be _GPL.  And where's the example user?
> 

GPL it is then :)

There are bunch of kprobes/jprobe modules 

Packet tracer module:

http://lkml.org/lkml/2004/8/16/179

I have few modules for adding dump_stack()
and collect few stats in various places (mostly
for debugging things). If you really want to see them
I can post.

The routine is used for resolving symbol to address, 
so that we can insert probe point, like ..

+	for (i = 0, nt = nettrace_objs; i < MAX_NETTRACE_ROUTINE; i++, nt++) {
+		nt = &nettrace_objs[i];
+		nt->jp.kp.addr = (kprobe_opcode_t *)
+		    kallsyms_lookup_name(nt->funcname);
+		if (nt->jp.kp.addr) {
+			printk("plant jprobe at %s (%p), handler addr %p\n",
+			       nt->funcname, nt->jp.kp.addr, nt->jp.entry);
+			register_jprobe(&nt->jp);
+		} else {
+			printk("couldn't find %s to plant jprobe\n",
+			       nt->funcname);
+		}
+	}


Thanks,
Badari

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