nr_free_buffer_pages
unsigned long limit = nr_free_buffer_pages() >> 4;
nrpages = (nr_free_buffer_pages() * 10) / 100;
max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
unsigned long nr_free_buffer_pages(void);
entries = nr_free_buffer_pages();
(unsigned long) nr_free_buffer_pages() / 20);
EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10);
chan->p9_max_pages = nr_free_buffer_pages()/4;
unsigned long limit = nr_free_buffer_pages() / 16;
limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7);
limit = nr_free_buffer_pages() / 8;
ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
free_mem_bytes = nr_free_buffer_pages() * (PAGE_SIZE >> 5);
limit = nr_free_buffer_pages() / 8;