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

From: Thomas Gleixner
Date: Wed Jul 10 2019 - 04:58:35 EST

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.