diff options
Diffstat (limited to 'mm/init-mm.c')
| -rw-r--r-- | mm/init-mm.c | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/mm/init-mm.c b/mm/init-mm.c index a56a851908d2..4600e7605cab 100644 --- a/mm/init-mm.c +++ b/mm/init-mm.c @@ -1,25 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 #include <linux/mm_types.h> -#include <linux/rbtree.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 <asm/pgtable.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_rb = RB_ROOT, + .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), - .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), + .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 + .user_ns = &init_user_ns, + .cpu_bitmap = CPU_BITS_NONE, 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; +} |