linux-kernel - Re: [PATCH v7 10/25] arm64: compat: Add vDSO

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Date:   Wed, 10 Jul 2019 10:12:45 +0100
From:   Will Deacon <will@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     John Stultz <john.stultz@...aro.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-arch@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>, linux-mips@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Andre Przywara <andre.przywara@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Huw Davies <huw@...eweavers.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Paul Burton <paul.burton@...s.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Shijith Thotton <sthotton@...vell.com>,
        Peter Collingbourne <pcc@...gle.com>
Subject: Re: [PATCH v7 10/25] arm64: compat: Add vDSO

On Wed, Jul 10, 2019 at 10:58:25AM +0200, Thomas Gleixner wrote:
> On Wed, 10 Jul 2019, Will Deacon wrote:
> > On Tue, Jul 09, 2019 at 09:02:54PM -0700, John Stultz wrote:
> > > I tried to bisect things down a bit, but as some later fixes are
> > > required (at one point, date was returning the start epoch and never
> > > increasing), this hasn't worked too well. But I'm guessing since I
> > > see: "CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will
> > > not be built", and the system is half working, I'm guessing this is an
> > > issue with just the 32bit code failing.  While I can try to sort out
> > > the proper CROSS_COMPILE_COMPAT in my build environment, I assume
> > > userland shouldn't be crashing if that value isn't set.
> > > 
> > > Any chance this issue has already been raised?
> > 
> > First I've seen of it, although Vincenzo is likely to know better than me.
> > In the meantime, please can you share your .config?
> 
> I think the key is: CROSS_COMPILE_COMPAT not defined or empty. And then run
> 32bit userspace.

The part I was wondering about is whether the vectors page has been disabled
at the same time, since I'm fairly sure I've already been running with the
above (but I can easily double-check).

Will