MIPS: checksum: Split the 'copy_user' symbol

The 'copy_user' symbol can be used to copy from or to
userland so we will use two different symbols for these
operations. This makes no difference in the existing code,
but when the core is operating in EVA mode, different instructions
need to be used to read and write to userland address space.
The old function has also been renamed to 'copy_kernel' to denote
that it is suitable for copy data to and from kernel space.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/arch/mips/lib/csum_partial.S b/arch/mips/lib/csum_partial.S
index a6adffbb4e5f..5d73d0d704a3 100644
--- a/arch/mips/lib/csum_partial.S
+++ b/arch/mips/lib/csum_partial.S
@@ -8,6 +8,7 @@
  * Copyright (C) 1998, 1999 Ralf Baechle
  * Copyright (C) 1999 Silicon Graphics, Inc.
  * Copyright (C) 2007  Maciej W. Rozycki
+ * Copyright (C) 2014 Imagination Technologies Ltd.
  */
 #include <linux/errno.h>
 #include <asm/asm.h>
@@ -296,7 +297,7 @@ LEAF(csum_partial)
  * checksum and copy routines based on memcpy.S
  *
  *      csum_partial_copy_nocheck(src, dst, len, sum)
- *      __csum_partial_copy_user(src, dst, len, sum, errp)
+ *      __csum_partial_copy_kernel(src, dst, len, sum, errp)
  *
  * See "Spec" in memcpy.S for details.  Unlike __copy_user, all
  * function in this file use the standard calling convention.
@@ -396,7 +397,9 @@ LEAF(csum_partial)
         .set    at=v1
 #endif
 
-LEAF(__csum_partial_copy_user)
+LEAF(__csum_partial_copy_kernel)
+FEXPORT(__csum_partial_copy_to_user)
+FEXPORT(__csum_partial_copy_from_user)
         PTR_ADDU        AT, src, len    /* See (1) above. */
 #ifdef CONFIG_64BIT
         move    errptr, a4
@@ -757,4 +760,4 @@ EXC(	lbu	t1, 0(src),	.Ll_exc)
         jr      ra
          sw     v1, (errptr)
         .set    pop
-        END(__csum_partial_copy_user)
+        END(__csum_partial_copy_kernel)