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, 92 deletions

diff --git a/arch/s390/lib/mem32.S b/arch/s390/lib/mem32.S
deleted file mode 100644
index 14ca9244b615..000000000000
--- a/arch/s390/lib/mem32.S
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * String handling functions.
- *
- * Copyright IBM Corp. 2012
- */
-
-#include <linux/linkage.h>
-
-/*
- * memset implementation
- *
- * This code corresponds to the C construct below. We do distinguish
- * between clearing (c == 0) and setting a memory array (c != 0) simply
- * because nearly all memset invocations in the kernel clear memory and
- * the xc instruction is preferred in such cases.
- *
- * void *memset(void *s, int c, size_t n)
- * {
- *	if (likely(c == 0))
- *		return __builtin_memset(s, 0, n);
- *	return __builtin_memset(s, c, n);
- * }
- */
-ENTRY(memset)
-	basr	%r5,%r0
-.Lmemset_base:
-	ltr	%r4,%r4
-	bzr	%r14
-	ltr	%r3,%r3
-	jnz	.Lmemset_fill
-	ahi	%r4,-1
-	lr	%r3,%r4
-	srl	%r3,8
-	ltr	%r3,%r3
-	lr	%r1,%r2
-	je	.Lmemset_clear_rest
-.Lmemset_clear_loop:
-	xc	0(256,%r1),0(%r1)
-	la	%r1,256(%r1)
-	brct	%r3,.Lmemset_clear_loop
-.Lmemset_clear_rest:
-	ex	%r4,.Lmemset_xc-.Lmemset_base(%r5)
-	br	%r14
-.Lmemset_fill:
-	stc	%r3,0(%r2)
-	chi	%r4,1
-	lr	%r1,%r2
-	ber	%r14
-	ahi	%r4,-2
-	lr	%r3,%r4
-	srl	%r3,8
-	ltr	%r3,%r3
-	je	.Lmemset_fill_rest
-.Lmemset_fill_loop:
-	mvc	1(256,%r1),0(%r1)
-	la	%r1,256(%r1)
-	brct	%r3,.Lmemset_fill_loop
-.Lmemset_fill_rest:
-	ex	%r4,.Lmemset_mvc-.Lmemset_base(%r5)
-	br	%r14
-.Lmemset_xc:
-	xc	0(1,%r1),0(%r1)
-.Lmemset_mvc:
-	mvc	1(1,%r1),0(%r1)
-
-/*
- * memcpy implementation
- *
- * void *memcpy(void *dest, const void *src, size_t n)
- */
-ENTRY(memcpy)
-	basr	%r5,%r0
-.Lmemcpy_base:
-	ltr	%r4,%r4
-	bzr	%r14
-	ahi	%r4,-1
-	lr	%r0,%r4
-	srl	%r0,8
-	ltr	%r0,%r0
-	lr	%r1,%r2
-	jnz	.Lmemcpy_loop
-.Lmemcpy_rest:
-	ex	%r4,.Lmemcpy_mvc-.Lmemcpy_base(%r5)
-	br	%r14
-.Lmemcpy_loop:
-	mvc	0(256,%r1),0(%r3)
-	la	%r1,256(%r1)
-	la	%r3,256(%r3)
-	brct	%r0,.Lmemcpy_loop
-	j	.Lmemcpy_rest
-.Lmemcpy_mvc:
-	mvc	0(1,%r1),0(%r3)