/* 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 */