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Date:   Fri, 03 May 2019 23:31:48 +1000
From:   Michael Ellerman <>
To:     Greg KH <>,
        Linus Torvalds <>
Cc:     Christoph Hellwig <>,
        Linux List Kernel Mailing <>,,
        Martin Schwidefsky <>,
        linux-s390 <>
Subject: Re: Linux 5.1-rc5

Greg KH <> writes:
> On Mon, Apr 15, 2019 at 09:17:10AM -0700, Linus Torvalds wrote:
>> On Sun, Apr 14, 2019 at 10:19 PM Christoph Hellwig <> wrote:
>> >
>> > Can we please have the page refcount overflow fixes out on the list
>> > for review, even if it is after the fact?
>> They were actually on a list for review long before the fact, but it
>> was the security mailing list. The issue actually got discussed back
>> in January along with early versions of the patches, but then we
>> dropped the ball because it just wasn't on anybody's radar and it got
>> resurrected late March. Willy wrote a rather bigger patch-series, and
>> review of that is what then resulted in those commits. So they may
>> look recent, but that's just because the original patches got
>> seriously edited down and rewritten.
>> That said, powerpc and s390 should at least look at maybe adding a
>> check for the page ref in their gup paths too. Powerpc has the special
>> gup_hugepte() case, and s390 has its own version of gup entirely. I
>> was actually hoping the s390 guys would look at using the generic gup
>> code.
>> I ruthlessly also entirely ignored MIPS, SH and sparc, since they seem
>> largely irrelevant, partly since even theoretically this whole issue
>> needs a _lot_ of memory.
>> Michael, Martin, see commit 6b3a70773630 ("Merge branch 'page-refs'
>> (page ref overflow)"). You may or may not really care.
> I've now queued these patches up for the next round of stable releases,
> as some people seem to care about these.
> I didn't see any follow-on patches for s390 or ppc64 hit the tree for
> these changes, am I just missing them and should also queue up a few
> more to handle this issue on those platforms?

No you haven't missed them for powerpc. It's on my list.


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