On Fri, Aug 21, 2020 at 12:05 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> Well, the fix is simple, although I don't love the magic PageKsm
> semantics that hide it from the page count.
>
> But since (a) a Ksm page is presumably normally shared (ie things like
> all zeroes) and (b) copying should always be safe, just do that.

I meant to attach the patch that did that, but didn't. Here is the
obvious modified version.

             Linus