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Date: Mon, 1 Jun 2020 13:07:50 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Dan Williams <dan.j.williams@intel.com>
Subject: Re: [5.4-stable PATCH 0/7] libnvdimm: Cross-arch compatible
 namespace alignment
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CC: stable <stable@vger.kernel.org>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Michael Ellerman <mpe@ellerman.id.au>, Paul Mackerras <paulus@samba.org>, Christoph Hellwig <hch@lst.de>, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, linux-nvdimm <linux-nvdimm@lists.01.org>
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On Tue, May 26, 2020 at 01:52:21PM -0700, Dan Williams wrote:
> On Tue, May 26, 2020 at 1:49 PM Jeff Moyer <jmoyer@redhat.com> wrote:
> >
> > Dan Williams <dan.j.williams@intel.com> writes:
> >
> > >> What problems with 5.4.y and 5.6.y is this series fixing
> > >> that used to work before?
> > >
> > > The "used to work" bug fixed by this set is the fact that the kernel
> > > used to force a 128MB (memory hotplug section size) alignment padding
> > > on all persistent memory namespaces to enable DAX operation. The
> > > support for sub-sections (2MB) dropped forced alignment padding, but
> > > unfortunately introduced a regression for the case of trying to create
> > > multiple unaligned namespaces. When that bug triggers namespace
> > > creation for the region is disabled, iirc, previously that lockout
> > > scenario was prevented.
> > >
> > > Jeff, can you corroborate this?
> >
> > So, I don't pretend to remember the exact state of brokenness for each
> > iteration.  :)  As far as I can recall, though, the issue you describe
> > with a misaligned namespace preventing further namespace creation was
> > present in all kernels up until it was finally fixed.
> 
> Well, if it was always there, then there is nothing to fix, and I
> misremembered that we went backwards.
> 
> > > I otherwise agree, if the above never worked then this can all wait
> > > for v5.7 upgrades.
> >
> > I can test specific kernel versions if that would help out.
> 
> Thanks for that offer, but outside of a clear regression I don't think
> this meets -stable criteria.

I agree, I'll drop this series from my pending-queue.

thanks,

greg k-h
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