| Vineet Gupta | 14e968b | 2013-01-18 15:12:16 +0530 | [diff] [blame^] | 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 |