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Current File : //usr/src/kernels/4.18.0-553.50.1.el8_10.x86_64/arch/x86/include/asm/preempt.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_PREEMPT_H
#define __ASM_PREEMPT_H

#include <asm/rmwcc.h>
#include <asm/percpu.h>
#include <linux/thread_info.h>

DECLARE_PER_CPU(int, __preempt_count);

/* We use the MSB mostly because its available */
#define PREEMPT_NEED_RESCHED	0x80000000

/*
 * We use the PREEMPT_NEED_RESCHED bit as an inverted NEED_RESCHED such
 * that a decrement hitting 0 means we can and should reschedule.
 */
#define PREEMPT_ENABLED	(0 + PREEMPT_NEED_RESCHED)

/*
 * We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users
 * that think a non-zero value indicates we cannot preempt.
 */
static __always_inline int preempt_count(void)
{
	return raw_cpu_read_4(__preempt_count) & ~PREEMPT_NEED_RESCHED;
}

static __always_inline void preempt_count_set(int pc)
{
	int old, new;

	do {
		old = raw_cpu_read_4(__preempt_count);
		new = (old & PREEMPT_NEED_RESCHED) |
			(pc & ~PREEMPT_NEED_RESCHED);
	} while (raw_cpu_cmpxchg_4(__preempt_count, old, new) != old);
}

/*
 * must be macros to avoid header recursion hell
 */
#define init_task_preempt_count(p) do { } while (0)

#define init_idle_preempt_count(p, cpu) do { \
	per_cpu(__preempt_count, (cpu)) = PREEMPT_ENABLED; \
} while (0)

/*
 * We fold the NEED_RESCHED bit into the preempt count such that
 * preempt_enable() can decrement and test for needing to reschedule with a
 * single instruction.
 *
 * We invert the actual bit, so that when the decrement hits 0 we know we both
 * need to resched (the bit is cleared) and can resched (no preempt count).
 */

static __always_inline void set_preempt_need_resched(void)
{
	raw_cpu_and_4(__preempt_count, ~PREEMPT_NEED_RESCHED);
}

static __always_inline void clear_preempt_need_resched(void)
{
	raw_cpu_or_4(__preempt_count, PREEMPT_NEED_RESCHED);
}

static __always_inline bool test_preempt_need_resched(void)
{
	return !(raw_cpu_read_4(__preempt_count) & PREEMPT_NEED_RESCHED);
}

/*
 * The various preempt_count add/sub methods
 */

static __always_inline void __preempt_count_add(int val)
{
	raw_cpu_add_4(__preempt_count, val);
}

static __always_inline void __preempt_count_sub(int val)
{
	raw_cpu_add_4(__preempt_count, -val);
}

/*
 * Because we keep PREEMPT_NEED_RESCHED set when we do _not_ need to reschedule
 * a decrement which hits zero means we have no preempt_count and should
 * reschedule.
 */
static __always_inline bool __preempt_count_dec_and_test(void)
{
	return GEN_UNARY_RMWcc("decl", __preempt_count, e, __percpu_arg([var]));
}

/*
 * Returns true when we need to resched and can (barring IRQ state).
 */
static __always_inline bool should_resched(int preempt_offset)
{
	return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
}

#ifdef CONFIG_PREEMPTION
  extern asmlinkage void ___preempt_schedule(void);
# define __preempt_schedule() \
	asm volatile ("call ___preempt_schedule" : ASM_CALL_CONSTRAINT)

  extern asmlinkage void preempt_schedule(void);
  extern asmlinkage void ___preempt_schedule_notrace(void);
# define __preempt_schedule_notrace() \
	asm volatile ("call ___preempt_schedule_notrace" : ASM_CALL_CONSTRAINT)

  extern asmlinkage void preempt_schedule_notrace(void);
#endif

#endif /* __ASM_PREEMPT_H */

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