Get rid of open-coding in ia64_brk()

asmlinkage unsigned long

ia64_brk (unsigned long brk)

{

	unsigned long rlim, retval, newbrk, oldbrk;

	struct mm_struct *mm = current->mm;

	/*

	 * Most of this replicates the code in sys_brk() except for an additional safety

	 * check and the clearing of r8.  However, we can't call sys_brk() because we need

	 * to acquire the mmap_sem before we can do the test...

	 */

	down_write(&mm->mmap_sem);

	if (brk < mm->end_code)

		goto out;

	newbrk = PAGE_ALIGN(brk);

	oldbrk = PAGE_ALIGN(mm->brk);

	if (oldbrk == newbrk)

		goto set_brk;

	/* Always allow shrinking brk. */

	if (brk <= mm->brk) {

		if (!do_munmap(mm, newbrk, oldbrk-newbrk))

			goto set_brk;

		goto out;

	}

	/* Check against unimplemented/unmapped addresses: */

	if ((newbrk - oldbrk) > RGN_MAP_LIMIT || REGION_OFFSET(newbrk) > RGN_MAP_LIMIT)

		goto out;

	/* Check against rlimit.. */

	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;

	if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim)

		goto out;

	/* Check against existing mmap mappings. */

	if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE))

		goto out;

	/* Ok, looks good - let it rip. */

	if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)

		goto out;

set_brk:

	mm->brk = brk;

out:

	retval = mm->brk;

	up_write(&mm->mmap_sem);

	unsigned long retval = sys_brk(brk);

	force_successful_syscall_return();

	return retval;

}