tracehook: vfork-done

This moves the PTRACE_EVENT_VFORK_DONE tracing into a tracehook.h inline,
tracehook_report_vfork_done().  The change has no effect, just clean-up.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 19 insertions, 4 deletions

diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
index 3ebc58b59766..830e6e16097d 100644
--- a/include/linux/tracehook.h
+++ b/include/linux/tracehook.h
@@ -210,4 +210,22 @@ static inline void tracehook_report_clone_complete(int trace,
                 ptrace_event(0, trace, pid);
 }
 
+/**
+ * tracehook_report_vfork_done - vfork parent's child has exited or exec'd
+ * @child:              child task, already running
+ * @pid:                new child's PID in the parent's namespace
+ *
+ * Called after a %CLONE_VFORK parent has waited for the child to complete.
+ * The clone/vfork system call will return immediately after this.
+ * The @child pointer may be invalid if a self-reaping child died and
+ * tracehook_report_clone() took no action to prevent it from self-reaping.
+ *
+ * Called with no locks held.
+ */
+static inline void tracehook_report_vfork_done(struct task_struct *child,
+                                               pid_t pid)
+{
+        ptrace_event(PT_TRACE_VFORK_DONE, PTRACE_EVENT_VFORK_DONE, pid);
+}
+
 #endif  /* <linux/tracehook.h> */
diff --git a/kernel/fork.c b/kernel/fork.c
index b42f8ed23611..abb3ed6298f6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1414,10 +1414,7 @@ long do_fork(unsigned long clone_flags,
                         freezer_do_not_count();
                         wait_for_completion(&vfork);
                         freezer_count();
-                        if (unlikely (current->ptrace & PT_TRACE_VFORK_DONE)) {
-                                current->ptrace_message = nr;
-                                ptrace_notify ((PTRACE_EVENT_VFORK_DONE << 8) | SIGTRAP);
-                        }
+                        tracehook_report_vfork_done(p, nr);
                 }
         } else {
                 nr = PTR_ERR(p);