14e968bad7
This covers the UP / SMP (with no hardware assist for atomic r-m-w) as well as ARC700 LLOCK/SCOND insns based. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARC_SMP_H
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#define __ASM_ARC_SMP_H
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/*
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* ARC700 doesn't support atomic Read-Modify-Write ops.
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* Originally Interrupts had to be disabled around code to gaurantee atomicity.
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* The LLOCK/SCOND insns allow writing interrupt-hassle-free based atomic ops
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* based on retry-if-irq-in-atomic (with hardware assist).
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* However despite these, we provide the IRQ disabling variant
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*
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* (1) These insn were introduced only in 4.10 release. So for older released
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* support needed.
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*/
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#ifndef CONFIG_ARC_HAS_LLSC
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#include <linux/irqflags.h>
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#define atomic_ops_lock(flags) local_irq_save(flags)
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#define atomic_ops_unlock(flags) local_irq_restore(flags)
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#define bitops_lock(flags) local_irq_save(flags)
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#define bitops_unlock(flags) local_irq_restore(flags)
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#endif /* !CONFIG_ARC_HAS_LLSC */
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#endif
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