From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/arm/include/asm/mcs_spinlock.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 arch/arm/include/asm/mcs_spinlock.h (limited to 'arch/arm/include/asm/mcs_spinlock.h') diff --git a/arch/arm/include/asm/mcs_spinlock.h b/arch/arm/include/asm/mcs_spinlock.h new file mode 100644 index 000000000..529d2cf4d --- /dev/null +++ b/arch/arm/include/asm/mcs_spinlock.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_MCS_LOCK_H +#define __ASM_MCS_LOCK_H + +#ifdef CONFIG_SMP +#include + +/* 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 */ -- cgit v1.2.3