arm64: uaccess: use asm EXPORT_SYMBOL()

For a while now it's been possible to use EXPORT_SYMBOL() in assembly
files, which allows us to place exports immediately after assembly
functions, as we do for C functions.

As a step towards removing arm64ksyms.c, let's move the uaccess exports
to the assembly files the functions are defined in.  As we have to
include <asm/assembler.h>, the existing includes are fixed to follow the
usual ordering conventions.

There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

arch/arm64/kernel/arm64ksyms.c

@@ -24,18 +24,11 @@
 #include <linux/delay.h>
 #include <linux/in6.h>
 #include <linux/syscalls.h>
-#include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/kprobes.h>
 
 #include <asm/checksum.h>
 
-	/* user mem (segment) */
-EXPORT_SYMBOL(__arch_copy_from_user);
-EXPORT_SYMBOL(__arch_copy_to_user);
-EXPORT_SYMBOL(__arch_clear_user);
-EXPORT_SYMBOL(__arch_copy_in_user);
-
 	/* string / mem functions */
 #ifndef CONFIG_KASAN
 EXPORT_SYMBOL(strchr);

arch/arm64/lib/clear_user.S

@@ -18,6 +18,7 @@
 #include <linux/linkage.h>
 
 #include <asm/asm-uaccess.h>
+#include <asm/assembler.h>
 
 	.text
 
@@ -53,6 +54,7 @@ uao_user_alternative 9f, strb, sttrb, wzr, x0, 0
 	uaccess_disable_not_uao x2, x3
 	ret
 ENDPROC(__arch_clear_user)
+EXPORT_SYMBOL(__arch_clear_user)
 
 	.section .fixup,"ax"
 	.align	2

arch/arm64/lib/copy_from_user.S

@@ -16,8 +16,9 @@
 
 #include <linux/linkage.h>
 
-#include <asm/cache.h>
 #include <asm/asm-uaccess.h>
+#include <asm/assembler.h>
+#include <asm/cache.h>
 
 /*
  * Copy from user space to a kernel buffer (alignment handled by the hardware)
@@ -71,6 +72,7 @@ ENTRY(__arch_copy_from_user)
 	mov	x0, #0				// Nothing to copy
 	ret
 ENDPROC(__arch_copy_from_user)
+EXPORT_SYMBOL(__arch_copy_from_user)
 
 	.section .fixup,"ax"
 	.align	2

arch/arm64/lib/copy_in_user.S

@@ -18,8 +18,9 @@
 
 #include <linux/linkage.h>
 
-#include <asm/cache.h>
 #include <asm/asm-uaccess.h>
+#include <asm/assembler.h>
+#include <asm/cache.h>
 
 /*
  * Copy from user space to user space (alignment handled by the hardware)
@@ -73,6 +74,7 @@ ENTRY(__arch_copy_in_user)
 	mov	x0, #0
 	ret
 ENDPROC(__arch_copy_in_user)
+EXPORT_SYMBOL(__arch_copy_in_user)
 
 	.section .fixup,"ax"
 	.align	2

arch/arm64/lib/copy_to_user.S

@@ -16,8 +16,9 @@
 
 #include <linux/linkage.h>
 
-#include <asm/cache.h>
 #include <asm/asm-uaccess.h>
+#include <asm/assembler.h>
+#include <asm/cache.h>
 
 /*
  * Copy to user space from a kernel buffer (alignment handled by the hardware)
@@ -70,6 +71,7 @@ ENTRY(__arch_copy_to_user)
 	mov	x0, #0
 	ret
 ENDPROC(__arch_copy_to_user)
+EXPORT_SYMBOL(__arch_copy_to_user)
 
 	.section .fixup,"ax"
 	.align	2