On Fri, Mar 7, 2025 at 12:26 AM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > On Thu, Mar 06, 2025 at 04:40:56PM +0900, Sooyong Suk wrote: > > There are GUP references to pages that are serving as direct IO buffers. > > Those pages can be allocated from CMA pageblocks despite they can be > > pinned until the DIO is completed. > > direct I/O is eactly the case that is not FOLL_LONGTERM and one of > the reasons to even have the flag. So big fat no to this. > Hello, thank you for your comment. We, Sooyong and I, wanted to get some opinions about this FOLL_LONGTERM for direct I/O as CMA memory got pinned pages which had been pinned from direct io. > You also completely failed to address the relevant mailinglist and > maintainers. I added block maintainer Jens Axboe and the block layer maillinst here, and added Suren and Sandeep, too.
