On Mon, Oct 14, 2024 at 4:32 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Mon, 14 Oct 2024 13:36:41 -0700 Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote: > > > Patch #2 copies module tags into virtually contiguous memory which > > serves two purposes: > > - Lets us deal with the situation when module is unloaded while there > > are still live allocations from that module. Since we are using a copy > > version of the tags we can safely unload the module. Space and gaps in > > this contiguous memory are managed using a maple tree. > > Does this make "lib: alloc_tag_module_unload must wait for pending > kfree_rcu calls" unneeded? With this change we can unload a module even when tags from that module are still in use. However "lib: alloc_tag_module_unload must wait for pending kfree_rcu calls" would still be useful because it will allow us to release the memory occupied by module's tags and let other modules use that memory. > If so, that patch was cc:stable (justifyably), so what to do about that? Now that I posted this patchset I'll work on backporting "lib: alloc_tag_module_unload must wait for pending kfree_rcu calls" and its prerequisites to 6.10 and 6.11. I'll try to get backports out tomorrow. I don't think we need to backport this patchset to pre-6.12 kernels since this is an improvement and not a bug fix. But if it's needed I can backport it as well. Thanks, Suren.
