From: Ben Hutchings <ben.hutchings@codethink.co.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: y2038 Mailman List <y2038@lists.linaro.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [Y2038] [PATCH 3/8] powerpc: fix vdso32 for ppc64le
Date: Wed, 20 Nov 2019 21:49:47 +0000 [thread overview]
Message-ID: <d82ef7b94b9c3adc4fbb4e62c17b81a868fb32d8.camel@codethink.co.uk> (raw)
In-Reply-To: <CAK8P3a3BPhX_NRFj66WyRLQUOCV-FGRjmPCgB7gqxMoK8hfywg@mail.gmail.com>
On Wed, 2019-11-20 at 20:35 +0100, Arnd Bergmann wrote:
> On Wed, Nov 20, 2019 at 8:13 PM Ben Hutchings
> <ben.hutchings@codethink.co.uk> wrote:
> > On Fri, 2019-11-08 at 21:34 +0100, Arnd Bergmann wrote:
> > > On little-endian 32-bit application running on 64-bit kernels,
> > > the current vdso would read the wrong half of the xtime seconds
> > > field. Change it to return the lower half like it does on
> > > big-endian.
> >
> > ppc64le doesn't have 32-bit compat so this is only theoretical.
>
> That is probably true. I only looked at the kernel, which today still
> supports compat mode for ppc64le, but I saw the patches to disable
> it, and I don't think anyone has even attempted building user space
> for it.
COMPAT is still enabled for some reason, but VDSO32 isn't (since 4.2).
Ben.
--
Ben Hutchings, Software Developer Codethink Ltd
https://www.codethink.co.uk/ Dale House, 35 Dale Street
Manchester, M1 2HF, United Kingdom
next prev parent reply other threads:[~2019-11-20 22:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 20:34 [PATCH 0/8] y2038: bug fixes from y2038 work Arnd Bergmann
2019-11-08 20:34 ` [PATCH 3/8] powerpc: fix vdso32 for ppc64le Arnd Bergmann
2019-11-20 19:13 ` [Y2038] " Ben Hutchings
2019-11-20 19:35 ` Arnd Bergmann
2019-11-20 21:49 ` Ben Hutchings [this message]
2019-11-21 10:02 ` Arnd Bergmann
2019-11-21 15:56 ` Ben Hutchings
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