linux/kernel/bpf/mmap_unlock_work.h

/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2021 Facebook
 */

#ifndef __MMAP_UNLOCK_WORK_H__
#define __MMAP_UNLOCK_WORK_H__
#include <linux/irq_work.h>

/* irq_work to run mmap_read_unlock() in irq_work */
struct mmap_unlock_irq_work { … };

DECLARE_PER_CPU(struct mmap_unlock_irq_work, mmap_unlock_work);

/*
 * We cannot do mmap_read_unlock() when the irq is disabled, because of
 * risk to deadlock with rq_lock. To look up vma when the irqs are
 * disabled, we need to run mmap_read_unlock() in irq_work. We use a
 * percpu variable to do the irq_work. If the irq_work is already used
 * by another lookup, we fall over.
 */
static inline bool bpf_mmap_unlock_get_irq_work(struct mmap_unlock_irq_work **work_ptr)
{ … }

static inline void bpf_mmap_unlock_mm(struct mmap_unlock_irq_work *work, struct mm_struct *mm)
{ … }

#endif /* __MMAP_UNLOCK_WORK_H__ */