| 1 | |
| 2 | #include <linux/mm_types.h>
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| 3 | #include <linux/maple_tree.h>
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| 4 | #include <linux/rwsem.h>
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| 5 | #include <linux/spinlock.h>
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| 6 | #include <linux/list.h>
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| 7 | #include <linux/cpumask.h>
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| 8 | #include <linux/mman.h>
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| 9 | #include <linux/pgtable.h>
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| 10 |
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| 11 | #include <linux/atomic.h>
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| 12 | #include <linux/user_namespace.h>
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| 13 | #include <linux/iommu.h>
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| 14 | #include <asm/mmu.h>
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| 15 |
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| 16 | #ifndef INIT_MM_CONTEXT
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| 17 | #define INIT_MM_CONTEXT(name)
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| 18 | #endif
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| 19 |
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| 20 | const struct vm_operations_struct vma_dummy_vm_ops;
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| 21 |
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| 22 | |
| 23 | * For dynamically allocated mm_structs, there is a dynamically sized cpumask
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| 24 | * at the end of the structure, the size of which depends on the maximum CPU
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| 25 | * number the system can see. That way we allocate only as much memory for
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| 26 | * mm_cpumask() as needed for the hundreds, or thousands of processes that
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| 27 | * a system typically runs.
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| 28 | *
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| 29 | * Since there is only one init_mm in the entire system, keep it simple
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| 30 | * and size this cpu_bitmask to NR_CPUS.
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| 31 |
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| 32 | struct mm_struct init_mm = {
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| 33 | .mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, init_mm.mmap_lock),
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| 34 | .pgd = swapper_pg_dir,
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| 35 | .mm_users = ATOMIC_INIT(2),
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| 36 | .mm_count = ATOMIC_INIT(1),
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| 37 | .write_protect_seq = SEQCNT_ZERO(init_mm.write_protect_seq),
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| 38 | MMAP_LOCK_INITIALIZER(init_mm)
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| 39 | .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
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| 40 | .arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock),
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| 41 | .mmlist = LIST_HEAD_INIT(init_mm.mmlist),
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| 42 | #ifdef CONFIG_PER_VMA_LOCK
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| 43 | .vma_writer_wait = __RCUWAIT_INITIALIZER(init_mm.vma_writer_wait),
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| 44 | .mm_lock_seq = SEQCNT_ZERO(init_mm.mm_lock_seq),
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| 45 | #endif
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| 46 | #ifdef CONFIG_SCHED_MM_CID
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| 47 | .mm_cid.lock = __RAW_SPIN_LOCK_UNLOCKED(init_mm.mm_cid.lock),
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| 48 | #endif
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| 49 | .flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT,
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| 50 | INIT_MM_CONTEXT(init_mm)
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| 51 | };
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| 52 |
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| 53 | void setup_initial_init_mm(void *start_code, void *end_code,
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| 54 | void *end_data, void *brk)
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| 55 | {
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| 56 | init_mm.start_code = (unsigned long)start_code;
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| 57 | init_mm.end_code = (unsigned long)end_code;
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| 58 | init_mm.end_data = (unsigned long)end_data;
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| 59 | init_mm.brk = (unsigned long)brk;
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| 60 | }
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