diff options
Diffstat (limited to 'mm/mmu_notifier.c')
| -rw-r--r-- | mm/mmu_notifier.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 7fde88695f35..367670cfd02b 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -28,6 +28,19 @@ struct lockdep_map __mmu_notifier_invalidate_range_start_map = { #endif /* + * The mmu notifier_mm structure is allocated and installed in + * mm->mmu_notifier_mm inside the mm_take_all_locks() protected + * critical section and it's released only when mm_count reaches zero + * in mmdrop(). + */ +struct mmu_notifier_mm { + /* all mmu notifiers registered in this mm are queued in this list */ + struct hlist_head list; + /* to serialize the list modifications and hlist_unhashed */ + spinlock_t lock; +}; + +/* * This function can't run concurrently against mmu_notifier_register * because mm->mm_users > 0 during mmu_notifier_register and exit_mmap * runs with mm_users == 0. Other tasks may still invoke mmu notifiers |