Cregit: Linux 7.0: spinlock.h

Contributors: 11
Author	Tokens	Token Proportion	Commits	Commit Proportion
Jeremy Fitzhardinge	11	26.83%	2	14.29%
Waiman Long	7	17.07%	3	21.43%
Glauber de Oliveira Costa	6	14.63%	1	7.14%
Andrew Morton	3	7.32%	1	7.14%
Nicholas Piggin	3	7.32%	1	7.14%
Andi Kleen	3	7.32%	1	7.14%
H. Peter Anvin	3	7.32%	1	7.14%
Thomas Gleixner	2	4.88%	1	7.14%
Richard Weinberger	1	2.44%	1	7.14%
Greg Kroah-Hartman	1	2.44%	1	7.14%
Arun Sharma	1	2.44%	1	7.14%
Total	41		14

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_SPINLOCK_H
#define _ASM_X86_SPINLOCK_H

#include <linux/jump_label.h>
#include <linux/atomic.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <linux/compiler.h>
#include <asm/bitops.h>

/*
 * Your basic SMP spinlocks, allowing only a single CPU anywhere
 *
 * Simple spin lock operations.  There are two variants, one clears IRQ's
 * on the local processor, one does not.
 *
 * These are fair FIFO ticket locks, which support up to 2^16 CPUs.
 *
 * (the type definitions are in asm/spinlock_types.h)
 */

/* How long a lock should spin before we consider blocking */
#define SPIN_THRESHOLD	(1 << 15)

#include <asm/qspinlock.h>

/*
 * Read-write spinlocks, allowing multiple readers
 * but only one writer.
 *
 * NOTE! it is quite common to have readers in interrupts
 * but no interrupt writers. For those circumstances we
 * can "mix" irq-safe locks - any writer needs to get a
 * irq-safe write-lock, but readers can get non-irqsafe
 * read-locks.
 *
 * On x86, we implement read-write locks using the generic qrwlock with
 * x86 specific optimization.
 */

#include <asm/qrwlock.h>

#endif /* _ASM_X86_SPINLOCK_H */