[ARM] 2946/2: split --arch_clear_user() out of lib/uaccess.S

Patch from Nicolas Pitre

Required for future enhancement patches.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 55 insertions, 40 deletions

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 71e5b99e519e..d3d9b21eb7e4 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -9,8 +9,9 @@ lib-y		:= backtrace.o changebit.o csumipv6.o csumpartial.o   \
                    copy_page.o delay.o findbit.o memchr.o memcpy.o    \
                    memset.o memzero.o setbit.o strncpy_from_user.o    \
                    strnlen_user.o strchr.o strrchr.o testchangebit.o  \
-                   testclearbit.o testsetbit.o uaccess.o getuser.o    \
-                   putuser.o ashldi3.o ashrdi3.o lshrdi3.o muldi3.o   \
+                   testclearbit.o testsetbit.o uaccess.o              \
+                   getuser.o putuser.o clear_user.o                   \
+                   ashldi3.o ashrdi3.o lshrdi3.o muldi3.o             \
                    ucmpdi2.o lib1funcs.o div64.o sha1.o               \
                    io-readsb.o io-writesb.o io-readsl.o io-writesl.o
 
diff --git a/arch/arm/lib/clear_user.S b/arch/arm/lib/clear_user.S
new file mode 100644
index 000000000000..7ff9f831b3f9
--- /dev/null
+++ b/arch/arm/lib/clear_user.S
@@ -0,0 +1,52 @@
+/*
+ *  linux/arch/arm/lib/clear_user.S
+ *
+ *  Copyright (C) 1995, 1996,1997,1998 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+                .text
+
+/* Prototype: int __arch_clear_user(void *addr, size_t sz)
+ * Purpose  : clear some user memory
+ * Params   : addr - user memory address to clear
+ *          : sz   - number of bytes to clear
+ * Returns  : number of bytes NOT cleared
+ */
+ENTRY(__arch_clear_user)
+                stmfd   sp!, {r1, lr}
+                mov     r2, #0
+                cmp     r1, #4
+                blt     2f
+                ands    ip, r0, #3
+                beq     1f
+                cmp     ip, #2
+USER(           strbt   r2, [r0], #1)
+USER(           strlebt r2, [r0], #1)
+USER(           strltbt r2, [r0], #1)
+                rsb     ip, ip, #4
+                sub     r1, r1, ip              @  7  6  5  4  3  2  1
+1:              subs    r1, r1, #8              @ -1 -2 -3 -4 -5 -6 -7
+USER(           strplt  r2, [r0], #4)
+USER(           strplt  r2, [r0], #4)
+                bpl     1b
+                adds    r1, r1, #4              @  3  2  1  0 -1 -2 -3
+USER(           strplt  r2, [r0], #4)
+2:              tst     r1, #2                  @ 1x 1x 0x 0x 1x 1x 0x
+USER(           strnebt r2, [r0], #1)
+USER(           strnebt r2, [r0], #1)
+                tst     r1, #1                  @ x1 x0 x1 x0 x1 x0 x1
+USER(           strnebt r2, [r0], #1)
+                mov     r0, #0
+                LOADREGS(fd,sp!, {r1, pc})
+
+                .section .fixup,"ax"
+                .align  0
+9001:           LOADREGS(fd,sp!, {r0, pc})
+                .previous
+
diff --git a/arch/arm/lib/uaccess.S b/arch/arm/lib/uaccess.S
index d3ed0636c008..c28449157bea 100644
--- a/arch/arm/lib/uaccess.S
+++ b/arch/arm/lib/uaccess.S
@@ -657,41 +657,3 @@ USER(		ldrgtbt	r3, [r1], #1)			@ May fault
                 LOADREGS(fd,sp!, {r4 - r7, pc})
                 .previous
 
-/* Prototype: int __arch_clear_user(void *addr, size_t sz)
- * Purpose  : clear some user memory
- * Params   : addr - user memory address to clear
- *          : sz   - number of bytes to clear
- * Returns  : number of bytes NOT cleared
- */
-ENTRY(__arch_clear_user)
-                stmfd   sp!, {r1, lr}
-                mov     r2, #0
-                cmp     r1, #4
-                blt     2f
-                ands    ip, r0, #3
-                beq     1f
-                cmp     ip, #2
-USER(           strbt   r2, [r0], #1)
-USER(           strlebt r2, [r0], #1)
-USER(           strltbt r2, [r0], #1)
-                rsb     ip, ip, #4
-                sub     r1, r1, ip              @  7  6  5  4  3  2  1
-1:              subs    r1, r1, #8              @ -1 -2 -3 -4 -5 -6 -7
-USER(           strplt  r2, [r0], #4)
-USER(           strplt  r2, [r0], #4)
-                bpl     1b
-                adds    r1, r1, #4              @  3  2  1  0 -1 -2 -3
-USER(           strplt  r2, [r0], #4)
-2:              tst     r1, #2                  @ 1x 1x 0x 0x 1x 1x 0x
-USER(           strnebt r2, [r0], #1)
-USER(           strnebt r2, [r0], #1)
-                tst     r1, #1                  @ x1 x0 x1 x0 x1 x0 x1
-USER(           strnebt r2, [r0], #1)
-                mov     r0, #0
-                LOADREGS(fd,sp!, {r1, pc})
-
-                .section .fixup,"ax"
-                .align  0
-9001:           LOADREGS(fd,sp!, {r0, pc})
-                .previous
-