From: Dan Williams <dan.j.williams@intel.com>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
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>
Subject: Re: [5.4-stable PATCH 0/7] libnvdimm: Cross-arch compatible namespace alignment
Date: Tue, 26 May 2020 13:52:21 -0700 [thread overview]
Message-ID: <CAPcyv4idRgByUTdb=6coYV=kkhqfLTzO1c+LZc7VQXus-BHh6Q@mail.gmail.com> (raw)
In-Reply-To: <x491rn6a0bp.fsf@segfault.boston.devel.redhat.com>
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.
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
next prev parent reply other threads:[~2020-05-26 20:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 23:37 [5.4-stable PATCH 0/7] libnvdimm: Cross-arch compatible namespace alignment Dan Williams
2020-05-21 23:37 ` [5.4-stable PATCH 1/7] mm/memremap_pages: Kill unused __devm_memremap_pages() Dan Williams
2020-05-21 23:37 ` [5.4-stable PATCH 2/7] mm/memremap_pages: Introduce memremap_compat_align() Dan Williams
2020-05-21 23:37 ` [5.4-stable PATCH 3/7] libnvdimm/pfn: Prevent raw mode fallback if pfn-infoblock valid Dan Williams
2020-05-21 23:38 ` [5.4-stable PATCH 4/7] libnvdimm/pfn_dev: Don't clear device memmap area during generic namespace probe Dan Williams
2020-05-21 23:38 ` [5.4-stable PATCH 5/7] libnvdimm/namespace: Enforce memremap_compat_align() Dan Williams
2020-05-21 23:38 ` [5.4-stable PATCH 6/7] libnvdimm/region: Introduce NDD_LABELING Dan Williams
2020-05-21 23:38 ` [5.4-stable PATCH 7/7] libnvdimm/region: Introduce an 'align' attribute Dan Williams
2020-05-22 11:58 ` [5.4-stable PATCH 0/7] libnvdimm: Cross-arch compatible namespace alignment Greg KH
2020-05-22 12:00 ` Greg KH
2020-05-26 20:42 ` Dan Williams
2020-05-26 20:49 ` Jeff Moyer
2020-05-26 20:52 ` Dan Williams [this message]
2020-06-01 11:07 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAPcyv4idRgByUTdb=6coYV=kkhqfLTzO1c+LZc7VQXus-BHh6Q@mail.gmail.com' \
--to=dan.j.williams@intel.com \
--cc=aneesh.kumar@linux.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=gregkh@linuxfoundation.org \
--cc=hch@lst.de \
--cc=jmoyer@redhat.com \
--cc=linux-nvdimm@lists.01.org \
--cc=mpe@ellerman.id.au \
--cc=paulus@samba.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).