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>

diff --git a/arch/mips/include/asm/checksum.h b/arch/mips/include/asm/checksum.h
index ac3d2b8a20d4bfa483fcb55d57e92670c2c08dd2..3c9aea55954f2344d322136f57816e147eed8335 100644 (file)
--- a/arch/mips/include/asm/checksum.h
+++ b/arch/mips/include/asm/checksum.h
@@ -7,6 +7,7 @@
  * Copyright (C) 1999 Silicon Graphics, Inc.
  * Copyright (C) 2001 Thiemo Seufer.
  * Copyright (C) 2002 Maciej W. Rozycki
+ * Copyright (C) 2014 Imagination Technologies Ltd.
  */
 #ifndef _ASM_CHECKSUM_H
 #define _ASM_CHECKSUM_H
@@ -29,8 +30,13 @@
  */
 __wsum csum_partial(const void *buff, int len, __wsum sum);
 
-__wsum __csum_partial_copy_user(const void *src, void *dst,
-                               int len, __wsum sum, int *err_ptr);
+__wsum __csum_partial_copy_kernel(const void *src, void *dst,
+                                 int len, __wsum sum, int *err_ptr);
+
+__wsum __csum_partial_copy_from_user(const void *src, void *dst,
+                                    int len, __wsum sum, int *err_ptr);
+__wsum __csum_partial_copy_to_user(const void *src, void *dst,
+                                  int len, __wsum sum, int *err_ptr);
 
 /*
  * this is a new version of the above that records errors it finds in *errp,
@@ -41,8 +47,8 @@ __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
                                   __wsum sum, int *err_ptr)
 {
        might_fault();
-       return __csum_partial_copy_user((__force void *)src, dst,
-                                       len, sum, err_ptr);
+       return __csum_partial_copy_from_user((__force void *)src, dst,
+                                            len, sum, err_ptr);
 }
 
 /*
@@ -55,8 +61,8 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
 {
        might_fault();
        if (access_ok(VERIFY_WRITE, dst, len))
-               return __csum_partial_copy_user(src, (__force void *)dst,
-                                               len, sum, err_ptr);
+               return __csum_partial_copy_to_user(src, (__force void *)dst,
+                                                  len, sum, err_ptr);
        if (len)
                *err_ptr = -EFAULT;
 

diff --git a/arch/mips/kernel/mips_ksyms.c b/arch/mips/kernel/mips_ksyms.c
index 13e60f676b8b91ab089cd49815b84a2d1e4acd59..2607c3a4ff7e9348f9c197884bd75bbe05fee76c 100644 (file)
--- a/arch/mips/kernel/mips_ksyms.c
+++ b/arch/mips/kernel/mips_ksyms.c
@@ -73,7 +73,9 @@ EXPORT_SYMBOL(__strnlen_user_asm);
 
 EXPORT_SYMBOL(csum_partial);
 EXPORT_SYMBOL(csum_partial_copy_nocheck);
-EXPORT_SYMBOL(__csum_partial_copy_user);
+EXPORT_SYMBOL(__csum_partial_copy_kernel);
+EXPORT_SYMBOL(__csum_partial_copy_to_user);
+EXPORT_SYMBOL(__csum_partial_copy_from_user);
 
 EXPORT_SYMBOL(invalid_pte_table);
 #ifdef CONFIG_FUNCTION_TRACER

diff --git a/arch/mips/lib/csum_partial.S b/arch/mips/lib/csum_partial.S
index a6adffbb4e5f0a5ccc5ec268c18c718b69c5a8da..5d73d0d704a3fcf166701432ab331e690bd3ac5c 100644 (file)
--- 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)