Cregit: Linux 7.0: qspinlock.h

Contributors: 6
Author	Tokens	Token Proportion	Commits	Commit Proportion
Peter Zijlstra	63	56.25%	5	38.46%
Waiman Long	29	25.89%	3	23.08%
Juergen Gross	12	10.71%	2	15.38%
Will Deacon	4	3.57%	1	7.69%
Glauber de Oliveira Costa	3	2.68%	1	7.69%
Greg Kroah-Hartman	1	0.89%	1	7.69%
Total	112		13

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_QSPINLOCK_H
#define _ASM_X86_QSPINLOCK_H

#include <linux/jump_label.h>
#include <asm/cpufeature.h>
#include <asm-generic/qspinlock_types.h>
#include <asm/paravirt.h>
#include <asm/rmwcc.h>
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt-spinlock.h>
#endif

#define _Q_PENDING_LOOPS	(1 << 9)

#define queued_fetch_set_pending_acquire queued_fetch_set_pending_acquire
static __always_inline u32 queued_fetch_set_pending_acquire(struct qspinlock *lock)
{
	u32 val;

	/*
	 * We can't use GEN_BINARY_RMWcc() inside an if() stmt because asm goto
	 * and CONFIG_PROFILE_ALL_BRANCHES=y results in a label inside a
	 * statement expression, which GCC doesn't like.
	 */
	val = GEN_BINARY_RMWcc(LOCK_PREFIX "btsl", lock->val.counter, c,
			       "I", _Q_PENDING_OFFSET) * _Q_PENDING_VAL;
	val |= atomic_read(&lock->val) & ~_Q_PENDING_MASK;

	return val;
}

#ifndef CONFIG_PARAVIRT
static inline void native_pv_lock_init(void) { }
#endif

#include <asm-generic/qspinlock.h>

#endif /* _ASM_X86_QSPINLOCK_H */