[PATCH v4] ARM: Add check for Cortex-A15 errata 798181 ECO

[Will Deacon]

On Mon, Sep 02, 2013 at 10:31:25PM +0100, Russell King - ARM Linux wrote:
> On Mon, Sep 02, 2013 at 02:58:42PM +0100, Russell King - ARM Linux wrote:
> > On Sun, Aug 25, 2013 at 09:25:47AM -0500, Rob Herring wrote:
> > > From: Rob Herring <rob.herring at calxeda.com>
> > > 
> > > The work-around for A15 errata 798181 is not needed if appropriate ECO
> > > fixes have been applied to r3p2 and earlier core revisions. This can be
> > > checked by reading REVIDR register bits 4 and 9. If only bit 4 is set,
> > > then the IPI broadcast can be skipped.
> > > 
> > > Signed-off-by: Rob Herring <rob.herring at calxeda.com>
> > 
> > So, this patch in the patch system claims to be against v3.11-rc2:
> > 
> > $ git checkout v3.11-rc2
> > ...
> > $ pdb gitapply 7804/2
> > Patching 7804/2...
> > git apply --whitespace=fix -p1 --index --check > /tmp/pdb.15757 2>&1 exited with non-zero status: 256
> > error: patch failed: arch/arm/include/asm/tlbflush.h:443
> > error: arch/arm/include/asm/tlbflush.h: patch does not apply
> > error: patch failed: arch/arm/kernel/smp_tlb.c:70
> > error: arch/arm/kernel/smp_tlb.c: patch does not apply
> > error: patch failed: arch/arm/mm/context.c:245
> > error: arch/arm/mm/context.c: patch does not apply
> > 
> > > v3:
> > > - Rebase to v3.11-rc5 due to commit 1f49856 (ARM: 7789/1: Do not run
> > >  dummy_flush_tlb_a15_erratum() on non-Cortex-A15)
> > > - Move the revision checking out of line and use function ptrs.
> > 
> > Hmm, so -rc5 not -rc2 that you put into the patch system...  Also, the
> > patch you put into the patch system didn't have Will's ack on it.
> 
> And... merging everything together tonight gives me a conflict with Will's
> barriers patches, which I've resolved like this - this will need to be
> checked:

Thanks Russell; looks ok from my side.

Will