How about the following?
static inline long
min_pages_to_free (void)
{
long pages_to_free;
pages_to_free = pgtable_quicklist_size - max_pgt_pages();
pages_to_free = min(pages_to_free, 1L << NODE_FREE_PAGES_SHIFT);
return pages_to_free;
}
void
check_pgt_cache (void)
{
long pages_to_free;
if (unlikely(pgtable_quicklist_size <= MIN_PGT_PAGES))
return;
preempt_disable();
while (unlikely((pages_to_free=min_pages_to_free()) > 0)) {
while (pages_to_free--) {
free_page((unsigned long)pgtable_quicklist_alloc());
}
preempt_enable();
preempt_disable();
}
preempt_enable();
}
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