s390: remove 31 bit support

Remove the 31 bit support in order to reduce maintenance cost and
effectively remove dead code. Since a couple of years there is no
distribution left that comes with a 31 bit kernel.

The 31 bit kernel also has been broken since more than a year before
anybody noticed. In addition I added a removal warning to the kernel
shown at ipl for 5 minutes: a960062e5826 ("s390: add 31 bit warning
message") which let everybody know about the plan to remove 31 bit
code. We didn't get any response.

Given that the last 31 bit only machine was introduced in 1999 let's
remove the code.
Anybody with 31 bit user space code can still use the compat mode.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 0 insertions, 33 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index db8f1115a3bf..d140160c9aec 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -198,19 +198,11 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
 	lc->panic_stack = panic_stack + PANIC_FRAME_OFFSET;
 	lc->cpu_nr = cpu;
 	lc->spinlock_lockval = arch_spin_lockval(cpu);
-#ifndef CONFIG_64BIT
-	if (MACHINE_HAS_IEEE) {
-		lc->extended_save_area_addr = get_zeroed_page(GFP_KERNEL);
-		if (!lc->extended_save_area_addr)
-			goto out;
-	}
-#else
 	if (MACHINE_HAS_VX)
 		lc->vector_save_area_addr =
 			(unsigned long) &lc->vector_save_area;
 	if (vdso_alloc_per_cpu(lc))
 		goto out;
-#endif
 	lowcore_ptr[cpu] = lc;
 	pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, (u32)(unsigned long) lc);
 	return 0;
@@ -229,16 +221,7 @@ static void pcpu_free_lowcore(struct pcpu *pcpu)
 {
 	pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0);
 	lowcore_ptr[pcpu - pcpu_devices] = NULL;
-#ifndef CONFIG_64BIT
-	if (MACHINE_HAS_IEEE) {
-		struct _lowcore *lc = pcpu->lowcore;
-
-		free_page((unsigned long) lc->extended_save_area_addr);
-		lc->extended_save_area_addr = 0;
-	}
-#else
 	vdso_free_per_cpu(pcpu->lowcore);
-#endif
 	if (pcpu == &pcpu_devices[0])
 		return;
 	free_page(pcpu->lowcore->panic_stack-PANIC_FRAME_OFFSET);
@@ -492,22 +475,6 @@ void arch_send_call_function_single_ipi(int cpu)
 	pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
 }
 
-#ifndef CONFIG_64BIT
-/*
- * this function sends a 'purge tlb' signal to another CPU.
- */
-static void smp_ptlb_callback(void *info)
-{
-	__tlb_flush_local();
-}
-
-void smp_ptlb_all(void)
-{
-	on_each_cpu(smp_ptlb_callback, NULL, 1);
-}
-EXPORT_SYMBOL(smp_ptlb_all);
-#endif /* ! CONFIG_64BIT */
-
 /*
  * this function sends a 'reschedule' IPI to another CPU.
  * it goes straight through and wastes no time serializing