linux-imx

// SPDX-License-Identifier: GPL-2.0

#include <linux/mm_types.h>

#include <linux/rbtree.h>

#include <linux/rwsem.h>

#include <linux/spinlock.h>

#include <linux/list.h>

#include <linux/cpumask.h>

​

#include <linux/atomic.h>

#include <linux/user_namespace.h>

#include <asm/pgtable.h>

#include <asm/mmu.h>

​

#ifndef INIT_MM_CONTEXT

#define INIT_MM_CONTEXT(name)

#endif

​

/*

 * For dynamically allocated mm_structs, there is a dynamically sized cpumask

 * at the end of the structure, the size of which depends on the maximum CPU

 * number the system can see. That way we allocate only as much memory for

 * mm_cpumask() as needed for the hundreds, or thousands of processes that

 * a system typically runs.

 *

 * Since there is only one init_mm in the entire system, keep it simple

 * and size this cpu_bitmask to NR_CPUS.

 */

struct mm_struct init_mm = {

    .mm_rb      = RB_ROOT,

    .pgd        = swapper_pg_dir,

    .mm_users   = ATOMIC_INIT(2),

    .mm_count   = ATOMIC_INIT(1),

    .mmap_sem   = __RWSEM_INITIALIZER(init_mm.mmap_sem),

    .page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),

    .arg_lock   =  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),

    .mmlist     = LIST_HEAD_INIT(init_mm.mmlist),

    .user_ns    = &init_user_ns,

    .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},

    INIT_MM_CONTEXT(init_mm)

};