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45 lines
1.2 KiB
45 lines
1.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_SPINLOCK_H |
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#define _ASM_X86_SPINLOCK_H |
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#include <linux/jump_label.h> |
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#include <linux/atomic.h> |
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#include <asm/page.h> |
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#include <asm/processor.h> |
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#include <linux/compiler.h> |
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#include <asm/paravirt.h> |
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#include <asm/bitops.h> |
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/* |
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* Your basic SMP spinlocks, allowing only a single CPU anywhere |
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* |
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* Simple spin lock operations. There are two variants, one clears IRQ's |
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* on the local processor, one does not. |
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* |
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* These are fair FIFO ticket locks, which support up to 2^16 CPUs. |
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* |
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* (the type definitions are in asm/spinlock_types.h) |
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*/ |
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/* How long a lock should spin before we consider blocking */ |
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#define SPIN_THRESHOLD (1 << 15) |
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#include <asm/qspinlock.h> |
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/* |
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* Read-write spinlocks, allowing multiple readers |
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* but only one writer. |
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* |
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* NOTE! it is quite common to have readers in interrupts |
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* but no interrupt writers. For those circumstances we |
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* can "mix" irq-safe locks - any writer needs to get a |
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* irq-safe write-lock, but readers can get non-irqsafe |
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* read-locks. |
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* |
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* On x86, we implement read-write locks using the generic qrwlock with |
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* x86 specific optimization. |
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*/ |
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#include <asm/qrwlock.h> |
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#endif /* _ASM_X86_SPINLOCK_H */
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