linux/arch/x86/hyperv/hv_spinlock.c

// SPDX-License-Identifier: GPL-2.0

/*
 * Hyper-V specific spinlock code.
 *
 * Copyright (C) 2018, Intel, Inc.
 *
 * Author : Yi Sun <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/spinlock.h>

#include <asm/mshyperv.h>
#include <asm/paravirt.h>
#include <asm/apic.h>

static bool hv_pvspin __initdata = …;

static void hv_qlock_kick(int cpu)
{ … }

static void hv_qlock_wait(u8 *byte, u8 val)
{ … }

/*
 * Hyper-V does not support this so far.
 */
__visible bool hv_vcpu_is_preempted(int vcpu)
{ … }

PV_CALLEE_SAVE_REGS_THUNK(…);

void __init hv_init_spinlocks(void)
{ … }

static __init int hv_parse_nopvspin(char *arg)
{ … }
early_param(…);