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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SWAP_SLOTS_H
#define _LINUX_SWAP_SLOTS_H
#include <linux/swap.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#define SWAP_SLOTS_CACHE_SIZE SWAP_BATCH
#define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE (5*SWAP_SLOTS_CACHE_SIZE)
#define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE (2*SWAP_SLOTS_CACHE_SIZE)
struct swap_slots_cache {
bool lock_initialized;
struct mutex alloc_lock; /* protects slots, nr, cur */
swp_entry_t *slots;
int nr;
int cur;
spinlock_t free_lock; /* protects slots_ret, n_ret */
swp_entry_t *slots_ret;
int n_ret;
};
void disable_swap_slots_cache_lock(void);
void reenable_swap_slots_cache_unlock(void);
int enable_swap_slots_cache(void);
int free_swap_slot(swp_entry_t entry);
extern bool swap_slot_cache_enabled;
#endif /* _LINUX_SWAP_SLOTS_H */
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