// 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(name)#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 = {	.mm_mt		= MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),	.pgd		= swapper_pg_dir,	.mm_users	= ATOMIC_INIT(2),	.mm_count	= ATOMIC_INIT(1),	.write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),	MMAP_LOCK_INITIALIZER(init_mm)	.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),#ifdef CONFIG_PER_VMA_LOCK	.vma_writer_wait = __RCUWAIT_INITIALIZER(init_mm.vma_writer_wait),	.mm_lock_seq	= SEQCNT_ZERO(init_mm.mm_lock_seq),#endif#ifdef CONFIG_SCHED_MM_CID	.mm_cid.lock = __RAW_SPIN_LOCK_UNLOCKED(init_mm.mm_cid.lock),#endif	.flexible_array	= MM_STRUCT_FLEXIBLE_ARRAY_INIT,	INIT_MM_CONTEXT(init_mm)}; void setup_initial_init_mm(void *start_code, void *end_code,			   void *end_data, void *brk){	init_mm.start_code = (unsigned long)start_code;	init_mm.end_code = (unsigned long)end_code;	init_mm.end_data = (unsigned long)end_data;	init_mm.brk = (unsigned long)brk;}