linux-stable/arch/powerpc/lib/usercopy_64.c
Paul Mackerras 70d64ceaa1 powerpc: Rename files to have consistent _32/_64 suffixes
This doesn't change any code, just renames things so we consistently
have foo_32.c and foo_64.c where we have separate 32- and 64-bit
versions.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-10-10 21:52:43 +10:00

41 lines
1.1 KiB
C

/*
* Functions which are too large to be inlined.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <asm/uaccess.h>
unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (likely(access_ok(VERIFY_READ, from, n)))
n = __copy_from_user(to, from, n);
else
memset(to, 0, n);
return n;
}
unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
{
if (likely(access_ok(VERIFY_WRITE, to, n)))
n = __copy_to_user(to, from, n);
return n;
}
unsigned long copy_in_user(void __user *to, const void __user *from,
unsigned long n)
{
might_sleep();
if (likely(access_ok(VERIFY_READ, from, n) &&
access_ok(VERIFY_WRITE, to, n)))
n =__copy_tofrom_user(to, from, n);
return n;
}
EXPORT_SYMBOL(copy_from_user);
EXPORT_SYMBOL(copy_to_user);
EXPORT_SYMBOL(copy_in_user);