FPI_TRYLOCK
if (!PageHighMem(page) && !(fpi_flags & FPI_TRYLOCK)) {
if (unlikely(fpi_flags & FPI_TRYLOCK)) {
if (unlikely(!llist_empty(llhead) && !(fpi_flags & FPI_TRYLOCK))) {
if (unlikely(fpi_flags & FPI_TRYLOCK)) {
if (unlikely((fpi_flags & FPI_TRYLOCK) && IS_ENABLED(CONFIG_PREEMPT_RT)
__free_frozen_pages(page, order, FPI_TRYLOCK);
___free_pages(page, order, FPI_TRYLOCK);
__free_frozen_pages(page, order, FPI_TRYLOCK);