sparc: Commonize memcmp assembler.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/sparc_ksyms_32.c

@@ -61,7 +61,6 @@ extern void (*bzero_1page)(void *);
 extern void *__bzero(void *, size_t);
 extern void *__memscan_zero(void *, size_t);
 extern void *__memscan_generic(void *, int, size_t);
-extern int __memcmp(const void *, const void *, __kernel_size_t);
 extern int __strncmp(const char *, const char *, __kernel_size_t);
 
 extern int __ashrdi3(int, int);
@@ -211,7 +210,6 @@ EXPORT_SYMBOL(bzero_1page);
 EXPORT_SYMBOL(__bzero);
 EXPORT_SYMBOL(__memscan_zero);
 EXPORT_SYMBOL(__memscan_generic);
-EXPORT_SYMBOL(__memcmp);
 EXPORT_SYMBOL(__strncmp);
 EXPORT_SYMBOL(__memmove);
 

arch/sparc/kernel/sparc_ksyms_64.c

@@ -62,7 +62,6 @@ extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 extern void *__bzero(void *, size_t);
 extern void *__memscan_zero(void *, size_t);
 extern void *__memscan_generic(void *, int, size_t);
-extern int __memcmp(const void *, const void *, __kernel_size_t);
 extern __kernel_size_t strlen(const char *);
 extern void sys_sigsuspend(void);
 extern int compat_sys_ioctl(unsigned int fd, unsigned int cmd, u32 arg);
@@ -223,7 +222,6 @@ EXPORT_SYMBOL(copy_user_page);
 EXPORT_SYMBOL(__bzero);
 EXPORT_SYMBOL(__memscan_zero);
 EXPORT_SYMBOL(__memscan_generic);
-EXPORT_SYMBOL(__memcmp);
 EXPORT_SYMBOL(__memset);
 
 EXPORT_SYMBOL(csum_partial);

arch/sparc/lib/Makefile

@@ -9,7 +9,7 @@ lib-$(CONFIG_SPARC32) += memcpy.o memset.o
 lib-y                 += strlen.o
 lib-y                 += checksum_$(BITS).o
 lib-$(CONFIG_SPARC32) += blockops.o
-lib-y                 += memscan_$(BITS).o memcmp_$(BITS).o strncmp_$(BITS).o
+lib-y                 += memscan_$(BITS).o memcmp.o strncmp_$(BITS).o
 lib-y                 += strncpy_from_user_$(BITS).o strlen_user_$(BITS).o
 lib-$(CONFIG_SPARC32) += divdi3.o udivdi3.o
 lib-$(CONFIG_SPARC32) += copy_user.o locks.o

arch/sparc/lib/memcmp.S

@@ -0,0 +1,27 @@
+/* Sparc optimized memcmp code.
+ *
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 2000, 2008 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+	.text
+ENTRY(memcmp)
+	cmp	%o2, 0
+1:	BRANCH32(be, pn, 2f)
+	 nop
+	ldub	[%o0], %g7
+	ldub	[%o1], %g3
+	sub	%o2, 1, %o2
+	add	%o0, 1, %o0
+	add	%o1, 1, %o1
+	subcc	%g7, %g3, %g3
+	BRANCH32(be, pt, 1b)
+	 cmp	%o2, 0
+	retl
+	 mov	%g3, %o0
+2:	retl
+	 mov	0, %o0
+ENDPROC(memcmp)