mm: code cleanup for MADV_FREE

#include <linux/swap.h>

/**

 * page_is_file_cache - should the page be on a file LRU or anon LRU?

 * page_is_file_lru - should the page be on a file LRU or anon LRU?

 * @page: the page to test

 *

 * Returns 1 if @page is page cache page backed by a regular filesystem,

 * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.

 * Used by functions that manipulate the LRU lists, to sort a page

 * onto the right LRU list.

 * Returns 1 if @page is a regular filesystem backed page cache page or a lazily

 * freed anonymous page (e.g. via MADV_FREE).  Returns 0 if @page is a normal

 * anonymous page, a tmpfs page or otherwise ram or swap backed page.  Used by

 * functions that manipulate the LRU lists, to sort a page onto the right LRU

 * list.

 *

 * We would like to get this info without a page flag, but the state

 * needs to survive until the page is last deleted from the LRU, which

 * could be as far down as __page_cache_release.

 */

static inline int page_is_file_cache(struct page *page)

static inline int page_is_file_lru(struct page *page)

{

	return !PageSwapBacked(page);

}

 */

static inline enum lru_list page_lru_base_type(struct page *page)

{

	if (page_is_file_cache(page))

	if (page_is_file_lru(page))

		return LRU_INACTIVE_FILE;

	return LRU_INACTIVE_ANON;

}

 * page_waitqueue(page) is a wait queue of all tasks waiting for the page

 * to become unlocked.

 *

 * PG_swapbacked is set when a page uses swap as a backing storage.  This are

 * usually PageAnon or shmem pages but please note that even anonymous pages

 * might lose their PG_swapbacked flag when they simply can be dropped (e.g. as

 * a result of MADV_FREE).

 *

 * PG_uptodate tells whether the page's contents is valid.  When a read

 * completes, the page becomes uptodate, unless a disk I/O error happened.

 *

	TP_fast_assign(

		__entry->pfn = page_to_pfn(page);

		__entry->reclaim_flags = trace_reclaim_flags(

						page_is_file_cache(page));

						page_is_file_lru(page));

	),

	TP_printk("page=%p pfn=%lu flags=%s",

		/* Successfully isolated */

		del_page_from_lru_list(page, lruvec, page_lru(page));

		mod_node_page_state(page_pgdat(page),

				NR_ISOLATED_ANON + page_is_file_cache(page),

				NR_ISOLATED_ANON + page_is_file_lru(page),

				hpage_nr_pages(page));

isolate_success:

					list_add_tail(&head->lru, &cma_page_list);

					mod_node_page_state(page_pgdat(head),

							    NR_ISOLATED_ANON +

							    page_is_file_cache(head),

							    page_is_file_lru(head),

							    hpage_nr_pages(head));

				}

			}