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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>
This commit is contained in:
Markos Chandras 2013-12-12 16:21:00 +00:00 committed by Ralf Baechle
parent c1771216ab
commit ac85227f76
3 changed files with 21 additions and 10 deletions
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18
arch/mips/include/asm/checksum.h
View File

@ -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;

4
arch/mips/kernel/mips_ksyms.c
View File

@ -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

9
arch/mips/lib/csum_partial.S
View File

@ -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)