Commit aedd74d4 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

swap_state: convert free_swap_cache() to use a folio 

Saves several calls to compound_head().

Link: https://lkml.kernel.org/r/20220902194653.1739778-40-willy@infradead.org


Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent cb691e2f

mm/swap_state.c

+8 −5
Original line number Diff line number Diff line
@@ -272,16 +272,19 @@ void clear_shadow_from_swap_cache(int type, unsigned long begin, 
/* 

 * If we are the only user, then try to free up the swap cache. 

 * 

 * Its ok to check for PageSwapCache without the page lock

 * Its ok to check the swapcache flag without the folio lock

 * here because we are going to recheck again inside

 * try_to_free_swap() _with_ the lock.

 * folio_free_swap() _with_ the lock.

 * 					- Marcelo

 */

void free_swap_cache(struct page *page)

{

	if (PageSwapCache(page) && !page_mapped(page) && trylock_page(page)) {

		try_to_free_swap(page);

		unlock_page(page);

	struct folio *folio = page_folio(page);



	if (folio_test_swapcache(folio) && !folio_mapped(folio) &&

	    folio_trylock(folio)) {

		folio_free_swap(folio);

		folio_unlock(folio);

	}

}