Bug#1079800: marked as done (release-notes - Document that default ppc64el kernel switched to 4k pages)
Your message dated Mon, 28 Jul 2025 23:00:33 +0200
with message-id <aIfk8TGg93d1wC-k@per.namespace.at>
and subject line Re: Bug#1079800: release-notes - Document that default ppc64el kernel switched to 4k pages
has caused the Debian Bug report #1079800,
regarding release-notes - Document that default ppc64el kernel switched to 4k pages
to be marked as done.
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1079800: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1079800
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--- Begin Message ---
Package: release-notes
The kernel team decided to switch the default kernel for ppc64el (and
with this also ppc64) to 4k page size. This is known to break systems
in some circumstances. We need to document this in the release notes as
well as in the package.
For reference, the NEWS entry in the package:
* From Linux 6.10, the default kernel on ppc64 and ppc64el
architectures uses 4k page size.
After rebooting, you need to re-create all swap files or partitions.
They depend on the page size and will be not longer usable. See
mkswap(8) on how to do that.
Some file systems might be incompatible with the smaller page size.
At least btrfs created with default settings is known to be affected
and they will not work with this kernel any more.
A btrfs file system can be checked with file(1) (use file -s). It
will show:
BTRFS Filesystem sectorsize 65536
If this number is larger then 4096, the file system can not be
mounted with the default kernel anymore.
If you are affected and require the 64k page size of older kernels,
you can install linux-image-powerpc64-64k or
linux-image-powerpc64el-64k packages.
Bastian
--
A Vulcan can no sooner be disloyal than he can exist without breathing.
-- Kirk, "The Menagerie", stardate 3012.4
--- End Message ---
--- Begin Message ---
On Sat, Jul 19, 2025 at 01:36:19AM +0200, Chris Hofstaedtler wrote:
> Control: forwarded -1 https://salsa.debian.org/ddp-team/release-notes/-/merge_requests/280
>
> On Tue, Aug 27, 2024 at 05:12:34PM +0200, Bastian Blank wrote:
> > The kernel team decided to switch the default kernel for ppc64el (and
> > with this also ppc64) to 4k page size. This is known to break systems
> > in some circumstances. We need to document this in the release notes as
> > well as in the package.
>
> It's unclear to me which info is useful directly in the
> release-notes, and what can just be in the kernel NEWS file.
>
> I've opened an MR at https://salsa.debian.org/ddp-team/release-notes/-/merge_requests/280
>
> Improvements & review welcome.
Ben submitted https://salsa.debian.org/ddp-team/release-notes/-/merge_requests/292
with improved text/contents and this was merged.
Closing.
Chris
--- End Message ---
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