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 gmnZBO47 jbv+fKcbxrzZp702HWaR1pU6kl9DWBaSzT0FvhGIMAjbApyfX5e1g1AsV/kVaEYday62kQKyAgrPSC04AIPKZaEzcVbDdDw2KGCZoC3mT1/xgMrTmNqL77cpWPCgvo25iHlIgM35HNm3TEuJi9KVpNMYJhePt0yfeZOd4TSPUC+jlajLt+G5sHCm1kJRjN8DNFBGnUFaVhfiEugvb/jHb/lelftbguAWnMYRznBXEifn4+0lbnO/Hc+5/g03L0eBiMnSyL/yZaryzwmKAtObsprFFdMNPxC3oMrQVTEBKl6K1mhuoMv+kwmP+IFIC/Sv+JNkJ/e8tLdtSo8xwzAkXQVYigPMj0QLJxEenvQ+YRxdXtFE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: * Thomas Gleixner [230516 18:48]: > On Mon, May 15 2023 at 15:27, Liam R. Howlett wrote: > > * Thomas Gleixner [230510 15:01]: > >> The documentation of mt_next() claims that it starts the search at the > >> provided index. That's incorrect as it starts the search after the provided > >> index. > >> > >> The documentation of mt_find() is slightly confusing. "Handles locking" is > >> not really helpful as it does not explain how the "locking" works. > > > > More locking notes can be found in Documentation/core-api/maple_tree.rst > > which lists mt_find() under the "Takes RCU read lock" list. I'm okay > > with duplicating the comment of taking the RCU read lock in here. > > Without a reference to the actual locking documentation such comments > are not super helpful. Noted. A reference to the larger document should probably be added. Thanks. > > >> Fix similar issues for mt_find_after() and mt_prev(). > >> > >> Remove the completely confusing and pointless "Note: Will not return the > >> zero entry." comment from mt_for_each() and document @__index correctly. > > > > The zero entry concept is an advanced API concept which allows you to > > store something that cannot be seen by the mt_* family of users, so it > > will not be returned and, instead, it will return NULL. Think of it as > > a reservation for an entry that isn't fully initialized. Perhaps it > > should read "Will not return the XA_ZERO_ENTRY" ? > >> > >> - * > >> - * Note: Will not return the zero entry. > > > > This function "will not return the zero entry", meaning it will return > > NULL if xa_is_zero(entry). > > If I understand correctly, this translates to: > > This iterator skips entries, which have been reserved for future use > but have not yet been fully initialized. > > Right? Well, that's one use of using the XA_ZERO_ENTRY, but it's really up to the user to decide why they are adding something that returns NULL in a specific range for the not-advanced API. It might be worth adding the XA_ZERO_ENTRY in here, since that's the only special value right now? > > >> @@ -6487,9 +6493,14 @@ EXPORT_SYMBOL(mtree_destroy); > >> * mt_find() - Search from the start up until an entry is found. > >> * @mt: The maple tree > >> * @index: Pointer which contains the start location of the search > >> - * @max: The maximum value to check > >> + * @max: The maximum value of the search range > >> + * > >> + * Takes RCU read lock internally to protect the search, which does not > >> + * protect the returned pointer after dropping RCU read lock. > >> * > >> - * Handles locking. @index will be incremented to one beyond the range. > >> + * In case that an entry is found @index contains the index of the found > >> + * entry plus one, so it can be used as iterator index to find the next > >> + * entry. > > > > What about: > > "In case that an entry is found @index contains the last index of the > > found entry plus one" > > Still confusing to the casual reader like me :) > > "In case that an entry is found @index is updated to point to the next > possible entry independent whether the found entry is occupying a > single index or a range if indices." > > Hmm? That makes sense to me. Thanks, Liam