[S390] improve irq tracing code in entry[64].S

The system call path in entry[64].S is run with interrupts enabled.
Remove the irq tracing check from the system call exit code. If a
program check interrupted a context enabled for interrupts do a
call to trace_irq_off_caller in the program check handler before
branching to the system call exit code.
Restructure the system call and io interrupt return code to avoid
avoid the lpsw[e] to disable machine checks.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 6309276516b9..598752499c3e 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -369,10 +369,6 @@ static void setup_addressing_mode(void)
                         pr_info("Address spaces switched, "
                                 "mvcos not available\n");
         }
-#ifdef CONFIG_TRACE_IRQFLAGS
-        sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
-        io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
-#endif
 }
 
 static void __init