signal: remove three noop tracehooks

Remove the following three noop tracehooks in signals.c.

* tracehook_force_sigpending()
* tracehook_get_signal()
* tracehook_finish_jctl()

The code area is about to be updated and these hooks don't do anything
other than obfuscating the logic.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>

1 files changed, 14 insertions, 30 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 172a4c79f12c..c99b8b5c0be7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -150,9 +150,7 @@ void recalc_sigpending_and_wake(struct task_struct *t)
 
 void recalc_sigpending(void)
 {
-        if (unlikely(tracehook_force_sigpending()))
-                set_thread_flag(TIF_SIGPENDING);
-        else if (!recalc_sigpending_tsk(current) && !freezing(current))
+        if (!recalc_sigpending_tsk(current) && !freezing(current))
                 clear_thread_flag(TIF_SIGPENDING);
 
 }
@@ -2005,8 +2003,6 @@ retry:
 
         spin_unlock_irq(&current->sighand->siglock);
 
-        tracehook_finish_jctl();
-
         return 1;
 }
 
@@ -2109,37 +2105,25 @@ relock:
 
         for (;;) {
                 struct k_sigaction *ka;
-                /*
-                 * Tracing can induce an artificial signal and choose sigaction.
-                 * The return value in @signr determines the default action,
-                 * but @info->si_signo is the signal number we will report.
-                 */
-                signr = tracehook_get_signal(current, regs, info, return_ka);
-                if (unlikely(signr < 0))
+
+                if (unlikely(current->jobctl & JOBCTL_STOP_PENDING) &&
+                    do_signal_stop(0))
                         goto relock;
-                if (unlikely(signr != 0))
-                        ka = return_ka;
-                else {
-                        if (unlikely(current->jobctl & JOBCTL_STOP_PENDING) &&
-                            do_signal_stop(0))
-                                goto relock;
 
-                        signr = dequeue_signal(current, &current->blocked,
-                                               info);
+                signr = dequeue_signal(current, &current->blocked, info);
 
-                        if (!signr)
-                                break; /* will return 0 */
+                if (!signr)
+                        break; /* will return 0 */
 
-                        if (signr != SIGKILL) {
-                                signr = ptrace_signal(signr, info,
-                                                      regs, cookie);
-                                if (!signr)
-                                        continue;
-                        }
-
-                        ka = &sighand->action[signr-1];
+                if (signr != SIGKILL) {
+                        signr = ptrace_signal(signr, info,
+                                              regs, cookie);
+                        if (!signr)
+                                continue;
                 }
 
+                ka = &sighand->action[signr-1];
+
                 /* Trace actually delivered signals. */
                 trace_signal_deliver(signr, info, ka);