diff options
| -rw-r--r-- | include/linux/mm_types.h | 3 | ||||
| -rw-r--r-- | kernel/fork.c | 3 | ||||
| -rw-r--r-- | mm/mmap.c | 3 |
3 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 500e536796ca..247aedb18d5c 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -725,7 +725,8 @@ struct mm_struct { unsigned long cpu_bitmap[]; }; -#define MM_MT_FLAGS (MT_FLAGS_ALLOC_RANGE | MT_FLAGS_LOCK_EXTERN) +#define MM_MT_FLAGS (MT_FLAGS_ALLOC_RANGE | MT_FLAGS_LOCK_EXTERN | \ + MT_FLAGS_USE_RCU) extern struct mm_struct init_mm; /* Pointer magic because the dynamic array size confuses some compilers. */ diff --git a/kernel/fork.c b/kernel/fork.c index a6d243a50be3..ec913b13c5ed 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -617,6 +617,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, if (retval) goto out; + mt_clear_in_rcu(mas.tree); mas_for_each(&old_mas, mpnt, ULONG_MAX) { struct file *file; @@ -703,6 +704,8 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, retval = arch_dup_mmap(oldmm, mm); loop_out: mas_destroy(&mas); + if (!retval) + mt_set_in_rcu(mas.tree); out: mmap_write_unlock(mm); flush_tlb_mm(oldmm); diff --git a/mm/mmap.c b/mm/mmap.c index 177714886849..fe1db604dc49 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2308,7 +2308,7 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma, int count = 0; int error = -ENOMEM; MA_STATE(mas_detach, &mt_detach, 0, 0); - mt_init_flags(&mt_detach, MT_FLAGS_LOCK_EXTERN); + mt_init_flags(&mt_detach, mas->tree->ma_flags & MT_FLAGS_LOCK_MASK); mt_set_external_lock(&mt_detach, &mm->mmap_lock); if (mas_preallocate(mas, vma, GFP_KERNEL)) @@ -3095,6 +3095,7 @@ void exit_mmap(struct mm_struct *mm) */ set_bit(MMF_OOM_SKIP, &mm->flags); mmap_write_lock(mm); + mt_clear_in_rcu(&mm->mm_mt); free_pgtables(&tlb, &mm->mm_mt, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING); tlb_finish_mmu(&tlb); |