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- /* 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 */
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