ptrace: Add @why to ptrace_stop()

To prepare for cleanup of the interaction between group stop and
ptrace, add @why to ptrace_stop().  Existing users are updated such
that there is no behavior change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Roland McGrath <roland@redhat.com>

diff --git a/kernel/signal.c b/kernel/signal.c
index 03d874e..95ac42d 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1617,7 +1617,7 @@ static int sigkill_pending(struct task_struct *tsk)
  * If we actually decide not to stop at all because the tracer
  * is gone, we keep current->exit_code unless clear_code.
  */
-static void ptrace_stop(int exit_code, int clear_code, siginfo_t *info)
+static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
        __releases(&current->sighand->siglock)
        __acquires(&current->sighand->siglock)
 {
@@ -1655,7 +1655,7 @@ static void ptrace_stop(int exit_code, int clear_code, siginfo_t *info)
        spin_unlock_irq(&current->sighand->siglock);
        read_lock(&tasklist_lock);
        if (may_ptrace_stop()) {
-               do_notify_parent_cldstop(current, CLD_TRAPPED);
+               do_notify_parent_cldstop(current, why);
                /*
                 * Don't want to allow preemption here, because
                 * sys_ptrace() needs this task to be inactive.
@@ -1714,7 +1714,7 @@ void ptrace_notify(int exit_code)
 
        /* Let the debugger run.  */
        spin_lock_irq(&current->sighand->siglock);
-       ptrace_stop(exit_code, 1, &info);
+       ptrace_stop(exit_code, CLD_TRAPPED, 1, &info);
        spin_unlock_irq(&current->sighand->siglock);
 }
 
@@ -1795,7 +1795,7 @@ static int ptrace_signal(int signr, siginfo_t *info,
        ptrace_signal_deliver(regs, cookie);
 
        /* Let the debugger run.  */
-       ptrace_stop(signr, 0, info);
+       ptrace_stop(signr, CLD_TRAPPED, 0, info);
 
        /* We're back.  Did the debugger cancel the sig?  */
        signr = current->exit_code;