1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm_types.h>
 3#include <linux/rbtree.h>
 4#include <linux/rwsem.h>
 5#include <linux/spinlock.h>
 6#include <linux/list.h>
 7#include <linux/cpumask.h>
 8#include <linux/mman.h>
 
 9
10#include <linux/atomic.h>
11#include <linux/user_namespace.h>
12#include <asm/pgtable.h>
13#include <asm/mmu.h>
14
15#ifndef INIT_MM_CONTEXT
16#define INIT_MM_CONTEXT(name)
17#endif
18
19/*
20 * For dynamically allocated mm_structs, there is a dynamically sized cpumask
21 * at the end of the structure, the size of which depends on the maximum CPU
22 * number the system can see. That way we allocate only as much memory for
23 * mm_cpumask() as needed for the hundreds, or thousands of processes that
24 * a system typically runs.
25 *
26 * Since there is only one init_mm in the entire system, keep it simple
27 * and size this cpu_bitmask to NR_CPUS.
28 */
29struct mm_struct init_mm = {
30	.mm_rb		= RB_ROOT,
31	.pgd		= swapper_pg_dir,
32	.mm_users	= ATOMIC_INIT(2),
33	.mm_count	= ATOMIC_INIT(1),
34	.mmap_sem	= __RWSEM_INITIALIZER(init_mm.mmap_sem),
 
35	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
36	.arg_lock	=  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
37	.mmlist		= LIST_HEAD_INIT(init_mm.mmlist),
38	.user_ns	= &init_user_ns,
39	.cpu_bitmap	= CPU_BITS_NONE,
40	INIT_MM_CONTEXT(init_mm)
41};

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm_types.h>
 3#include <linux/rbtree.h>
 4#include <linux/rwsem.h>
 5#include <linux/spinlock.h>
 6#include <linux/list.h>
 7#include <linux/cpumask.h>
 8#include <linux/mman.h>
 9#include <linux/pgtable.h>
10
11#include <linux/atomic.h>
12#include <linux/user_namespace.h>
 
13#include <asm/mmu.h>
14
15#ifndef INIT_MM_CONTEXT
16#define INIT_MM_CONTEXT(name)
17#endif
18
19/*
20 * For dynamically allocated mm_structs, there is a dynamically sized cpumask
21 * at the end of the structure, the size of which depends on the maximum CPU
22 * number the system can see. That way we allocate only as much memory for
23 * mm_cpumask() as needed for the hundreds, or thousands of processes that
24 * a system typically runs.
25 *
26 * Since there is only one init_mm in the entire system, keep it simple
27 * and size this cpu_bitmask to NR_CPUS.
28 */
29struct mm_struct init_mm = {
30	.mm_rb		= RB_ROOT,
31	.pgd		= swapper_pg_dir,
32	.mm_users	= ATOMIC_INIT(2),
33	.mm_count	= ATOMIC_INIT(1),
34	.write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
35	MMAP_LOCK_INITIALIZER(init_mm)
36	.page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
37	.arg_lock	=  __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
38	.mmlist		= LIST_HEAD_INIT(init_mm.mmlist),
39	.user_ns	= &init_user_ns,
40	.cpu_bitmap	= CPU_BITS_NONE,
41	INIT_MM_CONTEXT(init_mm)
42};
43
44void setup_initial_init_mm(void *start_code, void *end_code,
45			   void *end_data, void *brk)
46{
47	init_mm.start_code = (unsigned long)start_code;
48	init_mm.end_code = (unsigned long)end_code;
49	init_mm.end_data = (unsigned long)end_data;
50	init_mm.brk = (unsigned long)brk;
51}