[PATCH 0/2] Errata workaround updates

[Will Deacon]

On Wed, Feb 01, 2012 at 04:26:18PM +0000, Nicolas Pitre wrote:
> On Wed, 1 Feb 2012, Will Deacon wrote:
> 
> > Hello,
> > 
> > After Russell pointed out that we weren't applying an erratum workaround
> > in all cases that it was required:
> > 
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/082730.html
> > 
> > I went back through the documents for PL310 and Cortex-A9 to check that
> > what we have in Linux matches the latest workarounds.
> 
> Ideally, you should not limit the workaround only to those revisions 
> known to be broken but to any revision.  Only when a particular revision 
> is known to be fixed then should it be disabled.

For the general case I'd be inclined to agree, but when it involves poking
undocumented diagnostic registers I get scared and would rather only do it
when we know it's safe (since it could easily cause more problems on other
versions of the CPU).

Will