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To: linuxppc-dev@lists.ozlabs.org,
 Christophe Leroy <christophe.leroy@csgroup.eu>
From: Will Springer <skirmisher@protonmail.com>
Subject: Re: ppc64le and 32-bit LE userland compatibility
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Cc: libc-alpha@sourceware.org, eery@paperfox.es, daniel@octaforge.org,
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

On Saturday, May 30, 2020 3:17:24 PM PDT Will Springer wrote:
> On Saturday, May 30, 2020 8:37:43 AM PDT Christophe Leroy wrote:
> > There is a series at
> > https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=3D173231
> > to switch powerpc to the Generic C VDSO.
> >=20
> > Can you try and see whether it fixes your issue ?
> >=20
> > Christophe
>=20
> Sure thing, I spotted that after making the initial post. Will report
> back with results.
>=20
> Will [she/her]

Sorry for the wait, I just sat down to work on this again yesterday.

Tested this series on top of stable/linux-5.7.y (5.7.0 at the time of=20
writing), plus the one-line signal handler patch. Had to rewind to the=20
state of powerpc/merge at the time of the mail before the patch would=20
apply, then cherry-picked to 5.6 until I realized the patchset used some=20
functionality that didn't land until 5.7, so I moved it there.

Good news is that `date` now works correctly with the vdso call in 32-bit=
=20
LE. Bad news is it seems to have broken things on the 64-bit side=E2=80=
=94in my=20
testing, Void kicks off runit but hangs after starting eudev, and in a=20
Debian Stretch system, systemd doesn't get to the point of printing=20
anything whatsoever. (I had to `init=3D/bin/sh` to confirm the date worked=
=20
in ppcle, although in ppc64le running `date` also hung the system when it=
=20
made the vdso call...) Not sure how to approach debugging that, so I'd=20
appreciate any pointers.

Will [she/her]