mysterious crashes on OMAP5 uevm

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Tue, Sep 15, 2015 at 08:31:44PM +0300, Grazvydas Ignotas wrote:
> On Mon, Sep 14, 2015 at 10:35 PM, Dr. H. Nikolaus Schaller
> <hns@goldelico.com> wrote:
> >
> > Am 14.09.2015 um 21:02 schrieb Tony Lindgren <tony@atomide.com>:
> >
> >> * Russell King - ARM Linux <linux@arm.linux.org.uk> [150914 05:16]:
> >>> On Fri, Sep 11, 2015 at 03:03:07PM +0100, Russell King - ARM Linux wrote:
> >>>>
> >>>> Merely changing __LINUX_ARM_ARCH__ >= 7 to >= 6 should fix the problem,
> >>>> and I doubt there's any ARMv6 non-T2 systems out there that would be
> >>>> affected by clearing the IT state bits.
> >>>
> >>> Please test the following patch:
> >>
> >> While we're waiting for Grazvydas to test.. Looks good to me:
> >>
> >> Acked-by: Tony Lindgren <tony@atomide.com>
> >
> > I have tested on:
> > * GTA04 with DM3730 (OMAP3)
> > * Pyra prototype with OMAP5432
> > No X server crashes seen any more.
> >
> > Tested-by: H. Nikolaus Schaller <hns@goldelico.com>
> 
> Tested-by: Grazvydas Ignotas <notasas@gmail.com>
> on OMAP5 uevm running v4.2 built with omap2plus_defconfig.
> On v4.3-rc1 hsmmc controller probe is deferred for whatever reason and
> never reprobes, so my rootfs is never mounted and I could not test,
> but that looks unrelated.

Thanks.

> I guess it's worth marking this one for stable.

Indeed.

Having looked closer at the ARM ARM, these bits on older CPUs are marked
as UNK/SBZP (unknown, should be zero or preserved).  So it's safe to get
rid of that #if entirely.  Removing that #if won't affect the validity
of your testing as you've only tested on ARMv7 platforms with ARMv6
included in the kernel.

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