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 E5aLW7+X 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Vlastimil Babka wrote: > On 1/22/26 14:01, Lorenzo Stoakes wrote: > > These functions are very confusing indeed. 'Entering' a lock could be > > interpreted as acquiring it, but this is not what these functions are > > interacting with. > > > > Equally they don't indicate at all what kind of lock we are 'entering' or > > 'exiting'. Finally they are misleading as we invoke these functions when we > > already hold a write lock to detach a VMA. > > > > These functions are explicitly simply 'entering' and 'exiting' a state in > > which we hold the EXCLUSIVE lock in order that we can either mark the VMA > > as being write-locked, or mark the VMA detached. > > If we hold a write lock (i.e. in vma_mark_detached()), that normally means > it's also exclusive? > And if we talk about the state between __vma_enter_exclusive_locked and > __vma_exit_exclusive_locked() as "holding an EXCLUSIVE lock", it's not > exactly the same lock as what we call "VMA write lock" right, so what lock > is it? Well it's not exclusive because spurious reader refcount increments are possible (unless already detached of course...) We are _excluding_ readers, including spurious ones realyl. > > Maybe it would help if we stopped calling this internal thing a "lock"? > Except we use it for lockdep's lock_acquire_exclusive(). Sigh, sorry I don't > have any great suggestion. > > Maybe call those functions __vma_exclude_readers_start() and > __vma_exclude_readers_end() instead, or something? Yeah that's probably better actually, will rename accordingly. Cheers, Lorenzo