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Diffstat (limited to 'arch/arc/include/asm/smp.h')
| -rw-r--r-- | arch/arc/include/asm/smp.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h new file mode 100644 index 000000000000..4341f3ba7d92 --- /dev/null +++ b/arch/arc/include/asm/smp.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __ASM_ARC_SMP_H +#define __ASM_ARC_SMP_H + +/* + * ARC700 doesn't support atomic Read-Modify-Write ops. + * Originally Interrupts had to be disabled around code to gaurantee atomicity. + * The LLOCK/SCOND insns allow writing interrupt-hassle-free based atomic ops + * based on retry-if-irq-in-atomic (with hardware assist). + * However despite these, we provide the IRQ disabling variant + * + * (1) These insn were introduced only in 4.10 release. So for older released + * support needed. + */ +#ifndef CONFIG_ARC_HAS_LLSC + +#include <linux/irqflags.h> + +#define atomic_ops_lock(flags) local_irq_save(flags) +#define atomic_ops_unlock(flags) local_irq_restore(flags) + +#define bitops_lock(flags) local_irq_save(flags) +#define bitops_unlock(flags) local_irq_restore(flags) + +#endif /* !CONFIG_ARC_HAS_LLSC */ + +#endif |