[S390] duplicate SIGTRAP on signal delivery.
The code in do_signal sets the TIF_SINGLE_STEP bit and calls
tracehook_signal_handler after the signal frame has been set up.
This causes two SIGTRAP signals to be delivered to the tracer.
Stop setting the TIF_SINGLE_STEP bit in do_signal to get the
correct number of SIGTRAPs.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index 6b4fef8..1675c48 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -500,18 +500,10 @@
clear_thread_flag(TIF_RESTORE_SIGMASK);
/*
- * If we would have taken a single-step trap
- * for a normal instruction, act like we took
- * one for the handler setup.
- */
- if (current->thread.per_info.single_step)
- set_thread_flag(TIF_SINGLE_STEP);
-
- /*
* Let tracing know that we've done the handler setup.
*/
tracehook_signal_handler(signr, &info, &ka, regs,
- test_thread_flag(TIF_SINGLE_STEP));
+ current->thread.per_info.single_step);
}
return;
}