Re: hwpoison, shmem: fix data lost issue for 5.15.y

[Mike Kravetz <mike.kravetz@oracle.com>]

On 11/15/22 07:39, Naoya Horiguchi wrote:
> On Mon, Nov 14, 2022 at 05:11:35PM +0100, Greg KH wrote:
> > On Mon, Nov 14, 2022 at 10:14:03PM +0900, Naoya Horiguchi wrote:
> > > Hi,
> > > 
> > > I'd like to request the follow commits to be backported to 5.15.y.
> > > 
> > > - dd0f230a0a80 ("mm: hwpoison: refactor refcount check handling")
> > > - 4966455d9100 ("mm: hwpoison: handle non-anonymous THP correctly")
> > > - a76054266661 ("mm: shmem: don't truncate page if memory failure happens")
> > > 
> > > These patches fixed a data lost issue by preventing shmem pagecache from
> > > being removed by memory error.  These were not tagged for stable originally,
> > > but that's revisited recently.
> > 
> > And have you tested that these all apply properly (and in which order?)
> 
> Yes, I've checked that these cleanly apply (without any change) on
> 5.15.78 in the above order (i.e. dd0f23 is first, 496645 comes next,
> then a76054).
> 
> > and work correctly?
> 
> Yes, I ran related testcases in my test suite, and their status changed
> FAIL to PASS with these patches.

Hi Naoya,

Just curious if you have plans to do backports for earlier releases?

If not, I can start that effort.  We have seen data loss/corruption because of
this on a 4.14 based release.   So, I would go at least that far back.
-- 
Mike Kravetz