sh64: Kill off special clear_page() implementation.

This can use the now generic clear_page() implementation, which is backed
by the sh64 optimized memset routine. This also fixes up the case where
PAGE_SIZE != 4kB.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/sh_ksyms_64.c

@@ -52,7 +52,6 @@ EXPORT_SYMBOL(__get_user_asm_l);
 EXPORT_SYMBOL(__get_user_asm_q);
 EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(__strncpy_from_user);
-EXPORT_SYMBOL(clear_page);
 EXPORT_SYMBOL(__clear_user);
 EXPORT_SYMBOL(copy_page);
 EXPORT_SYMBOL(__copy_user);

arch/sh/lib64/Makefile

@@ -11,7 +11,7 @@
 
 # Panic should really be compiled as PIC
 lib-y  := udelay.o dbg.o panic.o memcpy.o memset.o \
-	  copy_user_memcpy.o copy_page.o clear_page.o strcpy.o strlen.o
+	  copy_user_memcpy.o copy_page.o strcpy.o strlen.o
 
 # Extracted from libgcc
 lib-y	+= udivsi3.o udivdi3.o sdivsi3.o

arch/sh/lib64/clear_page.S

-/*
-   Copyright 2003 Richard Curnow, SuperH (UK) Ltd.
-
-   This file is subject to the terms and conditions of the GNU General Public
-   License.  See the file "COPYING" in the main directory of this archive
-   for more details.
-
-   Tight version of memset for the case of just clearing a page.  It turns out
-   that having the alloco's spaced out slightly due to the increment/branch
-   pair causes them to contend less for access to the cache.  Similarly,
-   keeping the stores apart from the allocos causes less contention.  => Do two
-   separate loops.  Do multiple stores per loop to amortise the
-   increment/branch cost a little.
-
-   Parameters:
-   r2 : source effective address (start of page)
-
-   Always clears 4096 bytes.
-
-   Note : alloco guarded by synco to avoid TAKum03020 erratum
-
-*/
-
-	.section .text..SHmedia32,"ax"
-	.little
-
-	.balign 8
-	.global clear_page
-clear_page:
-	pta/l 1f, tr1
-	pta/l 2f, tr2
-	ptabs/l r18, tr0
-
-	movi 4096, r7
-	add  r2, r7, r7
-	add  r2, r63, r6
-1:
-	alloco r6, 0
-	synco	! TAKum03020
-	addi	r6, 32, r6
-	bgt/l	r7, r6, tr1
-
-	add  r2, r63, r6
-2:
-	st.q  r6,   0, r63
-	st.q  r6,   8, r63
-	st.q  r6,  16, r63
-	st.q  r6,  24, r63
-	addi r6, 32, r6
-	bgt/l r7, r6, tr2
-
-	blink tr0, r63
-
-