On Mon, Jan 31, 2022 at 8:43 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Mon, 31 Jan 2022 20:02:55 -0300 Mauricio Faria de Oliveira <mfo@xxxxxxxxxxxxx> wrote:
>
> > Problem:
> > =======
> >
> > Userspace might read the zero-page instead of actual data from a
> > direct IO read on a block device if the buffers have been called
> > madvise(MADV_FREE) on earlier (this is discussed below) due to a
> > race between page reclaim on MADV_FREE and blkdev direct IO read.
> >
> > ...
> >
> > Fixes: 802a3a92ad7a ("mm: reclaim MADV_FREE pages")
>
> Five years ago. As it doesn't seem urgent I targeted 5.18-rc1 for
> this, and added a cc:stable so it will trickle back into earlier trees.
>
> How does this plan sound?
That sounds good; it's not urgent, indeed. Thanks!
--
Mauricio Faria de Oliveira
