linux/mm/init-mm.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/mm_types.h>
#include <linux/maple_tree.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/mman.h>
#include <linux/pgtable.h>

#include <linux/atomic.h>
#include <linux/user_namespace.h>
#include <linux/iommu.h>
#include <asm/mmu.h>

#ifndef INIT_MM_CONTEXT
#define INIT_MM_CONTEXT …
#endif

const struct vm_operations_struct vma_dummy_vm_ops;

/*
 * 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 = …;

void setup_initial_init_mm(void *start_code, void *end_code,
			   void *end_data, void *brk)
{ … }