regset: kill user_regset_copyout{,_zero}()

 */

const struct user_regset_view *task_user_regset_view(struct task_struct *tsk);

/*

 * These are helpers for writing regset get/set functions in arch code.

 * Because @start_pos and @end_pos are always compile-time constants,

 * these are inlined into very little code though they look large.

 *

 * Use one or more calls sequentially for each chunk of regset data stored

 * contiguously in memory.  Call with constants for @start_pos and @end_pos,

 * giving the range of byte positions in the regset that data corresponds

 * to; @end_pos can be -1 if this chunk is at the end of the regset layout.

 * Each call updates the arguments to point past its chunk.

 */

static inline int user_regset_copyout(unsigned int *pos, unsigned int *count,

				      void **kbuf,

				      void __user **ubuf, const void *data,

				      const int start_pos, const int end_pos)

{

	if (*count == 0)

		return 0;

	BUG_ON(*pos < start_pos);

	if (end_pos < 0 || *pos < end_pos) {

		unsigned int copy = (end_pos < 0 ? *count

				     : min(*count, end_pos - *pos));

		data += *pos - start_pos;

		if (*kbuf) {

			memcpy(*kbuf, data, copy);

			*kbuf += copy;

		} else if (__copy_to_user(*ubuf, data, copy))

			return -EFAULT;

		else

			*ubuf += copy;

		*pos += copy;

		*count -= copy;

	}

	return 0;

}

static inline int user_regset_copyin(unsigned int *pos, unsigned int *count,

				     const void **kbuf,

				     const void __user **ubuf, void *data,

	return 0;

}

/*

 * These two parallel the two above, but for portions of a regset layout

 * that always read as all-zero or for which writes are ignored.

 */

static inline int user_regset_copyout_zero(unsigned int *pos,

					   unsigned int *count,

					   void **kbuf, void __user **ubuf,

					   const int start_pos,

					   const int end_pos)

{

	if (*count == 0)

		return 0;

	BUG_ON(*pos < start_pos);

	if (end_pos < 0 || *pos < end_pos) {

		unsigned int copy = (end_pos < 0 ? *count

				     : min(*count, end_pos - *pos));

		if (*kbuf) {

			memset(*kbuf, 0, copy);

			*kbuf += copy;

		} else if (clear_user(*ubuf, copy))

			return -EFAULT;

		else

			*ubuf += copy;

		*pos += copy;

		*count -= copy;

	}

	return 0;

}

static inline int user_regset_copyin_ignore(unsigned int *pos,

					    unsigned int *count,

					    const void **kbuf,