commit 00d7c05ab168c10f9b520e07400923267bc04419
author Keshavamurthy Anil S <anil.s.keshavamurthy@intel.com> Mon Dec 12 00:37:33 2005 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> Mon Dec 12 08:57:45 2005 -0800
tree 5899743965a801e34e7dc6bfe59dba20ba023540
parent cda315aba34ff4fb66bbb2945b723688f3414a75

[PATCH] kprobes: no probes on critical path

For Kprobes critical path is the path from debug break exception handler
till the control reaches kprobes exception code.  No probes can be
supported in this path as we will end up in recursion.

This patch prevents this by moving the below function to safe __kprobes
section onto which no probes can be inserted.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/sys.c

diff --git a/kernel/sys.c b/kernel/sys.c
index bce933e..eecf845 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -32,6 +32,7 @@
 
 #include <linux/compat.h>
 #include <linux/syscalls.h>
+#include <linux/kprobes.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -168,7 +169,7 @@
  *	of the last notifier function called.
  */
  
-int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
+int __kprobes notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
 {
 	int ret=NOTIFY_DONE;
 	struct notifier_block *nb = *n;