| /* 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 */ |