> +int mmu_interval_notifier_insert(struct mmu_interval_notifier *mni, > + struct mm_struct *mm, unsigned long start, > + unsigned long length, > + const struct mmu_interval_notifier_ops *ops); > +int mmu_interval_notifier_insert_locked( > + struct mmu_interval_notifier *mni, struct mm_struct *mm, > + unsigned long start, unsigned long length, > + const struct mmu_interval_notifier_ops *ops); Very inconsistent indentation between these two related functions. > + /* > + * The inv_end incorporates a deferred mechanism like > + * rtnl_unlock(). Adds and removes are queued until the final inv_end > + * happens then they are progressed. This arrangement for tree updates > + * is used to avoid using a blocking lock during > + * invalidate_range_start. Nitpick: That comment can be condensed into one less line: /* * The inv_end incorporates a deferred mechanism like rtnl_unlock(). * Adds and removes are queued until the final inv_end happens then * they are progressed. This arrangement for tree updates is used to * avoid using a blocking lock during invalidate_range_start. */ > + /* > + * TODO: Since we already have a spinlock above, this would be faster > + * as wake_up_q > + */ > + if (need_wake) > + wake_up_all(&mmn_mm->wq); So why is this important enough for a TODO comment, but not important enough to do right away? > + * release semantics on the initialization of the mmu_notifier_mm's > + * contents are provided for unlocked readers. acquire can only be > + * used while holding the mmgrab or mmget, and is safe because once > + * created the mmu_notififer_mm is not freed until the mm is > + * destroyed. As above, users holding the mmap_sem or one of the > + * mm_take_all_locks() do not need to use acquire semantics. > */ Some spaces instead of tabs here. > +static int __mmu_interval_notifier_insert( > + struct mmu_interval_notifier *mni, struct mm_struct *mm, > + struct mmu_notifier_mm *mmn_mm, unsigned long start, > + unsigned long length, const struct mmu_interval_notifier_ops *ops) Odd indentation - we usuall do two tabs (my preference) or align after the opening brace. > + * This function must be paired with mmu_interval_notifier_insert(). It cannot be line > 80 chars. Otherwise this looks good and very similar to what I reviewed earlier: Reviewed-by: Christoph Hellwig <hch@xxxxxx>
