slice_mask_for_size
psize_mask = slice_mask_for_size(&mm->context, psize);
old_mask = slice_mask_for_size(&mm->context, old_psize);
old_mask = slice_mask_for_size(&mm->context, old_psize);
maskp = slice_mask_for_size(&mm->context, psize);
compat_maskp = slice_mask_for_size(&mm->context, MMU_PAGE_4K);
mask = slice_mask_for_size(&mm->context, psize);
maskp = slice_mask_for_size(&mm->context, psize);
compat_maskp = slice_mask_for_size(&mm->context, MMU_PAGE_4K);