1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __ASM_ARC_SMP_H 10 #define __ASM_ARC_SMP_H 11 12 /* 13 * ARC700 doesn't support atomic Read-Modify-Write ops. 14 * Originally Interrupts had to be disabled around code to gaurantee atomicity. 15 * The LLOCK/SCOND insns allow writing interrupt-hassle-free based atomic ops 16 * based on retry-if-irq-in-atomic (with hardware assist). 17 * However despite these, we provide the IRQ disabling variant 18 * 19 * (1) These insn were introduced only in 4.10 release. So for older released 20 * support needed. 21 */ 22 #ifndef CONFIG_ARC_HAS_LLSC 23 24 #include <linux/irqflags.h> 25 26 #define atomic_ops_lock(flags) local_irq_save(flags) 27 #define atomic_ops_unlock(flags) local_irq_restore(flags) 28 29 #define bitops_lock(flags) local_irq_save(flags) 30 #define bitops_unlock(flags) local_irq_restore(flags) 31 32 #endif /* !CONFIG_ARC_HAS_LLSC */ 33 34 #endif 35