// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/mm/swap.c
 *
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 */

/*
 * This file contains the default values for the operation of the
 * Linux VM subsystem. Fine-tuning documentation can be found in
 * Documentation/admin-guide/sysctl/vm.rst.
 * Started 18.12.91
 * Swap aging added 23.2.95, Stephen Tweedie.
 * Buffermem limits added 12.3.98, Rik van Riel.
 */

/* Extracted unchanged from Linux v6.1, mm/swap.c:80-99.
 * Full function definition; surrounding kernel context is required.
 * Source: https://github.com/torvalds/linux/blob/v6.1/mm/swap.c#L80
 * License text: GPL-2.0.txt (in this directory).
 */
static void __page_cache_release(struct folio *folio)
{
	if (folio_test_lru(folio)) {
		struct lruvec *lruvec;
		unsigned long flags;

		lruvec = folio_lruvec_lock_irqsave(folio, &flags);
		lruvec_del_folio(lruvec, folio);
		__folio_clear_lru_flags(folio);
		unlock_page_lruvec_irqrestore(lruvec, flags);
	}
	/* See comment on folio_test_mlocked in release_pages() */
	if (unlikely(folio_test_mlocked(folio))) {
		long nr_pages = folio_nr_pages(folio);

		__folio_clear_mlocked(folio);
		zone_stat_mod_folio(folio, NR_MLOCK, -nr_pages);
		count_vm_events(UNEVICTABLE_PGCLEARED, nr_pages);
	}
}