[S390] Fix compile error on 31bit without preemption

Commit b8e7a54cd06b0b0174029ef3a7f5a1415a2c28f2 introduced a compile
error if CONFIG_PREEMPT is not set:

arch/s390/kernel/built-in.o: In function `cleanup_io_leave_insn':
/space/kvm/arch/s390/kernel/entry.S:(.text+0xbfce): undefined reference to `preempt_schedule_irq'

This patch hides preempt_schedule_irq if CONFIG_PREEMPT is not set.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index b2b2edc40eb1..1a6dac8df6fb 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -1079,8 +1079,10 @@ cleanup_io_leave_insn:
 .Lexecve_tail:  .long   execve_tail
 .Ljump_table:   .long   pgm_check_table
 .Lschedule:     .long   schedule
+#ifdef CONFIG_PREEMPT
 .Lpreempt_schedule_irq:
                 .long   preempt_schedule_irq
+#endif
 .Ltrace:        .long   syscall_trace
 .Lschedtail:    .long   schedule_tail
 .Lsysc_table:   .long   sys_call_table