// 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.
 */

/* Exact v6.0 mm/swap.c:49-74 declaration/macro scope.
 * Source: https://github.com/torvalds/linux/blob/v6.0/mm/swap.c#L49
 * License text: GPL-2.0.txt. Kernel context is required.
 */
/* Protecting only lru_rotate.fbatch which requires disabling interrupts */
struct lru_rotate {
	local_lock_t lock;
	struct folio_batch fbatch;
};
static DEFINE_PER_CPU(struct lru_rotate, lru_rotate) = {
	.lock = INIT_LOCAL_LOCK(lock),
};

/*
 * The following folio batches are grouped together because they are protected
 * by disabling preemption (and interrupts remain enabled).
 */
struct cpu_fbatches {
	local_lock_t lock;
	struct folio_batch lru_add;
	struct folio_batch lru_deactivate_file;
	struct folio_batch lru_deactivate;
	struct folio_batch lru_lazyfree;
#ifdef CONFIG_SMP
	struct folio_batch activate;
#endif
};
static DEFINE_PER_CPU(struct cpu_fbatches, cpu_fbatches) = {
	.lock = INIT_LOCAL_LOCK(lock),
};