linux-kernel - Re: [Y2038] [PATCH v2 2/2] ppdev: add support for compat ioctl

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Message-ID: <20160102062929.GA10432@sudip-pc>
Date:	Sat, 2 Jan 2016 11:59:29 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>,
	y2038@...ts.linaro.org, gregkh@...uxfoundation.org,
	broonie@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [Y2038] [PATCH v2 2/2] ppdev: add support for compat ioctl

On Fri, Jan 01, 2016 at 11:09:45PM +0100, Arnd Bergmann wrote:
> On Friday 01 January 2016 10:34:25 Sudip Mukherjee wrote:
> > > Did you happen to check with both 32-bit and 64-bit user space on a
> > > 64-bit kernel? This is one of the things that was not working originally
> > > but should work now.
> > 
> > I dont think I can manage 32 bit userspace on 64-bit kernel here. But I
> > can definitely check it on a kvm guest.
> 
> Just to be sure we are talking about the same thing: you mean running a 64-bit
> kernel in a kvm guest with a 32-bit file system, right? Running a 32-bit
> kvm guest on a 64-bit host would not be interesting of course.

The kvm (actually qemu, started from virt-manager with -enable-kvm) that
I just configured shows the following:

lscpu shows:

Architecture:          i686
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 6
Stepping:              3
CPU MHz:               2993.200
BogoMIPS:              5986.40
Virtualization:        VT-x
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K

uname -i shows:
i686


Will it be ok to test in this one?

regards
sudip
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