s390: fix control register update

The git commit c63badebfebacdba827ab1cc1d420fc81bd8d818
"s390: optimize control register update" broke the update for
control register 0. After the update do the lctlg from the correct
value.

Cc: <stable@vger.kernel.org> # 3.14
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 4ac8faf..1c82619 100644 (file)
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -64,7 +64,7 @@ void update_cr_regs(struct task_struct *task)
                if (task->thread.per_flags & PER_FLAG_NO_TE)
                        cr_new &= ~(1UL << 55);
                if (cr_new != cr)
-                       __ctl_load(cr, 0, 0);
+                       __ctl_load(cr_new, 0, 0);
                /* Set or clear transaction execution TDC bits 62 and 63. */
                __ctl_store(cr, 2, 2);
                cr_new = cr & ~3UL;