/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_MCS_LOCK_H
#define __ASM_MCS_LOCK_H

#ifdef CONFIG_SMP
#include <asm/spinlock.h>

/* MCS spin-locking. */
#define arch_mcs_spin_lock_contended(lock)                              \
do {                                                                    \
        /* Ensure prior stores are observed before we enter wfe. */     \
        smp_mb();                                                       \
        while (!(smp_load_acquire(lock)))                               \
                wfe();                                                  \
} while (0)                                                             \

#define arch_mcs_spin_unlock_contended(lock)                            \
do {                                                                    \
        smp_store_release(lock, 1);                                     \
        dsb_sev();                                                      \
} while (0)

#endif  /* CONFIG_SMP */
#endif  /* __ASM_MCS_LOCK_H */