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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: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-02 20:46:35 +01:00 committed by Andrew Morton
parent cb691e2f28
commit aedd74d439
1 changed files with 8 additions and 5 deletions
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13
mm/swap_state.c
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@ -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);
}
}