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maccess,probe_kernel: Make write/read src const void * 

The functions probe_kernel_write() and probe_kernel_read() do not modify
the src pointer. Allow const pointers to be passed in without the need
of a typecast.

Acked-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1305824936.1465.4.camel@gandalf.stny.rr.com
hifive-unleashed-5.1
Steven Rostedt 2011-05-19 14:35:33 -04:00 committed by Steven Rostedt
parent 6e9101aeec
commit f29c50419c
4 changed files with 12 additions and 12 deletions
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4
arch/blackfin/mm/maccess.c
View File

@ -16,7 +16,7 @@ static int validate_memory_access_address(unsigned long addr, int size)
return bfin_mem_access_type(addr, size);
}
long probe_kernel_read(void *dst, void *src, size_t size)
long probe_kernel_read(void *dst, const void *src, size_t size)
{
unsigned long lsrc = (unsigned long)src;
int mem_type;
@ -55,7 +55,7 @@ long probe_kernel_read(void *dst, void *src, size_t size)
return -EFAULT;
}
long probe_kernel_write(void *dst, void *src, size_t size)
long probe_kernel_write(void *dst, const void *src, size_t size)
{
unsigned long ldst = (unsigned long)dst;
int mem_type;

4
arch/s390/mm/maccess.c
View File

@ -19,7 +19,7 @@
* using the stura instruction.
* Returns the number of bytes copied or -EFAULT.
*/
static long probe_kernel_write_odd(void *dst, void *src, size_t size)
static long probe_kernel_write_odd(void *dst, const void *src, size_t size)
{
unsigned long count, aligned;
int offset, mask;
@ -45,7 +45,7 @@ static long probe_kernel_write_odd(void *dst, void *src, size_t size)
return rc ? rc : count;
}
long probe_kernel_write(void *dst, void *src, size_t size)
long probe_kernel_write(void *dst, const void *src, size_t size)
{
long copied = 0;

8
include/linux/uaccess.h
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@ -93,8 +93,8 @@ static inline unsigned long __copy_from_user_nocache(void *to,
* Safely read from address @src to the buffer at @dst. If a kernel fault
* happens, handle that and return -EFAULT.
*/
extern long probe_kernel_read(void *dst, void *src, size_t size);
extern long __probe_kernel_read(void *dst, void *src, size_t size);
extern long probe_kernel_read(void *dst, const void *src, size_t size);
extern long __probe_kernel_read(void *dst, const void *src, size_t size);
/*
* probe_kernel_write(): safely attempt to write to a location
@ -105,7 +105,7 @@ extern long __probe_kernel_read(void *dst, void *src, size_t size);
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
extern long notrace probe_kernel_write(void *dst, void *src, size_t size);
extern long notrace __probe_kernel_write(void *dst, void *src, size_t size);
extern long notrace probe_kernel_write(void *dst, const void *src, size_t size);
extern long notrace __probe_kernel_write(void *dst, const void *src, size_t size);
#endif /* __LINUX_UACCESS_H__ */

8
mm/maccess.c
View File

@ -15,10 +15,10 @@
* happens, handle that and return -EFAULT.
*/
long __weak probe_kernel_read(void *dst, void *src, size_t size)
long __weak probe_kernel_read(void *dst, const void *src, size_t size)
__attribute__((alias("__probe_kernel_read")));
long __probe_kernel_read(void *dst, void *src, size_t size)
long __probe_kernel_read(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
@ -43,10 +43,10 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
long __weak probe_kernel_write(void *dst, void *src, size_t size)
long __weak probe_kernel_write(void *dst, const void *src, size_t size)
__attribute__((alias("__probe_kernel_write")));
long __probe_kernel_write(void *dst, void *src, size_t size)
long __probe_kernel_write(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();