[PATCH] kprobes: fix unloading of self probed module
When a kprobes modules is written in such a way that probes are inserted on
itself, then unload of that moudle was not possible due to reference
couning on the same module.
The below patch makes a check and incrementes the module refcount only if
it is not a self probed module.
We need to allow modules to probe themself for kprobes performance
measurements
This patch has been tested on several x86_64, ppc64 and IA64 architectures.
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 10005bc..669756b 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -68,6 +68,9 @@
/* list of kprobes for multi-handler support */
struct list_head list;
+ /* Indicates that the corresponding module has been ref counted */
+ unsigned int mod_refcounted;
+
/*count the number of times this probe was temporarily disarmed */
unsigned long nmissed;