Revert "parisc: implement full version of access_ok()"

/*

 * User space memory access functions

 */

#include <asm/processor.h>

#include <asm/page.h>

#include <asm/cache.h>

#include <asm/errno.h>

#include <asm-generic/uaccess-unaligned.h>

#include <linux/sched.h>

#define VERIFY_READ 0

#define VERIFY_WRITE 1

extern int __put_kernel_bad(void);

extern int __put_user_bad(void);

/*

 * Test whether a block of memory is a valid user space address.

 * Returns 0 if the range is valid, nonzero otherwise.

 */

static inline int __range_not_ok(unsigned long addr, unsigned long size,

				 unsigned long limit)

static inline long access_ok(int type, const void __user * addr,

		unsigned long size)

{

	unsigned long __newaddr = addr + size;

	return (__newaddr < addr || __newaddr > limit || size > limit);

	return 1;

}

/**

 * access_ok: - Checks if a user space pointer is valid

 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE.  Note that

 *        %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe

 *        to write to a block, it is always safe to read from it.

 * @addr: User space pointer to start of block to check

 * @size: Size of block to check

 *

 * Context: User context only.  This function may sleep.

 *

 * Checks if a pointer to a block of memory in user space is valid.

 *

 * Returns true (nonzero) if the memory block may be valid, false (zero)

 * if it is definitely invalid.

 *

 * Note that, depending on architecture, this function probably just

 * checks that the pointer is in the user space range - after calling

 * this function, memory access functions may still return -EFAULT.

 */

#define access_ok(type, addr, size)					\

(	__chk_user_ptr(addr),						\

	!__range_not_ok((unsigned long) (__force void *) (addr),	\

			size, user_addr_max())				\

)

#define put_user __put_user

#define get_user __get_user

/*

 * Complex access routines -- macros

 */

#ifdef CONFIG_COMPAT

#define user_addr_max() (TASK_SIZE)

#else

#define user_addr_max() (DEFAULT_TASK_SIZE)

#endif

#define user_addr_max() (~0UL)

#define strnlen_user lstrnlen_user

#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)