pin_user_pages_unlocked
err = pin_user_pages_unlocked(user_dma.uaddr, user_dma.page_count,
y_pages = pin_user_pages_unlocked(y_dma.uaddr,
uv_pages = pin_user_pages_unlocked(uv_dma.uaddr,
long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
EXPORT_SYMBOL(pin_user_pages_unlocked);
npages = pin_user_pages_unlocked(kfp->hva, 1, &page, flags);