[PATCH 19] "disable" tracehook_prepare_clone()

[Oleg Nesterov]

The most problematic user of "->ptrace & PT_" checks is
tracehook_prepare_clone().

I need to re-check this, but iirc this hook is not needed at all since
"[PATCH 10] ptrace_report_clone: rework auto-attaching".

This patch changes it to always return 0.

---

 include/linux/tracehook.h |   12 ------------
 1 file changed, 12 deletions(-)

--- PU/include/linux/tracehook.h~19_DISABLE_PREPARE_CLONE	2009-08-20 20:09:25.000000000 +0200
+++ PU/include/linux/tracehook.h	2009-09-02 20:30:00.000000000 +0200
@@ -208,18 +208,6 @@ static inline void tracehook_report_exit
  */
 static inline int tracehook_prepare_clone(unsigned clone_flags)
 {
-	if (clone_flags & CLONE_UNTRACED)
-		return 0;
-
-	if (clone_flags & CLONE_VFORK) {
-		if (current->ptrace & PT_TRACE_VFORK)
-			return PTRACE_EVENT_VFORK;
-	} else if ((clone_flags & CSIGNAL) != SIGCHLD) {
-		if (current->ptrace & PT_TRACE_CLONE)
-			return PTRACE_EVENT_CLONE;
-	} else if (current->ptrace & PT_TRACE_FORK)
-		return PTRACE_EVENT_FORK;
-
 	return 0;
 }